Executive Summary. Comparative Testing Volumetric versus Drum Truck

Transcription

1 9 Spring Street, Silver Spring, MD 91 (1) * Fax (1) Member Companies: Bay-Lynx Manufacturing, Inc. Cemen Tech, Inc. Custom-Crete, Inc. Elkin Hi-Tech, Inc. ProAll International Mfg. Inc. Zimmerman Industries Executive Summary Comparative Testing Volumetric versus Drum Truck In July of 1, the Volumetric Mixer Manufactures Bureau (VMMB) initiated a study to compare the quality of concrete produced by means of a volumetric mixer as compared to drum mixed concrete. A third party engineering testing firm was used to conduct field and laboratory tests and draft a report. A final report was stamped by a professional engineer and completed in March of 11. Both drum mixed concrete and volumetric mixed concrete were produced by using raw materials from the same source, with an identical mix design. The concrete was produced in accordance with ASTM C94 and ASTM C685 respectively. Materials used in all concretes were reported to be similar. All concrete field tests were performed by American Concrete Institute (ACI) certified technicians. The concrete was tested for slump (ASTM C14), air content (ASTM C1), temperature (ASTM C164), unit weight (ASTM C18) and compressive strength cylinders (ASTM C1) were molded, from each of four quarters of both the volumetrically mixed and drum mixed concrete. Compressive strength specimens were tested following procedures in ASTM C9 and ASTM C617 at 7 days, 8 days and 56 days age. The author of the report concluded the compressive strength of the volumetrically mixed concrete had a marginally higher strength gain at all three test ages as compared to the drum mixed concrete at similar water cement ratios. The author also states, Based on the field and laboratory test results it appears that the volumetric and drum mixed production methods produce similar results when similar materials are used to produce concrete within a specified slump, air content and water cement ratio.

2 December 5, 1 Custom-Crete 64 Joe Field Rd. Dallas, Texas 759 Attention : Mr. Jerry Gaubert Telephone : (97) Fax : (97) jerry.gaubert@oldcastle.com Re: - Volumetric versus Drum Truck, Revision 1 Volumetric Mixer Manufacturing Bureau (VMMB) Terracon No Dear Mr. Gaubert: Terracon Consultants, Inc. (Terracon) is pleased to submit this letter report following completion of the performed for Custom-Crete. The work was performed in general accordance with Terracon Proposal No. P9111 dated August 17, 1 and changes to the scope as agreed upon by Custom-Crete to the sampling frequency and number of compressive strength test specimens of concrete during the conference call on December 1, 1. The finalized scope of work was authorized by Mr. Jerry Gaubert of Custom-Crete through execution of Terracon s Agreement for Services signed December 9, 1 and verbal confirmation of the scope changes during the conference call on December 1, 1. It was informed to Terracon that Custom-Crete was facilitating this project on behalf of the Volumetric Mixer Manufacturing Bureau. Report presents our field and laboratory test data, as well as a discussion of the test results. 1. PROJECT INFORMATION The purpose of this project was to compare concrete mix properties of similar plant batched ready-mix concrete from a volumetric versus a drum truck. The field and laboratory test results will be used to compare the two concrete mixing and delivery methods. The goal is to evaluate the efficiency of both methods. In this report, a discussion of the field and laboratory test results of three concrete mixes comprising of two volumetric and one drum mixed concrete during two separate placements is presented. Terracon submitted the test results from the concrete comparative testing through its report dated March 1, 11. Terracon Consultants, Inc Clay Road, Suite 1 Houston, Texas 774 Registration No. F -7 P [71] F [71] terracon.com

3 Report of Services, Revision 1 Custom-Crete Houston, Texas December 5, 1 Terracon No SCOPE OF SERVICES Our scope of services included field and laboratory testing:.1 Field Sampling and Testing Terracon provided four ACI certified technicians to perform various tests to compare concrete mix properties for similar concrete mix designs, when batched from a volumetric versus a drum truck. Four technicians were assigned in groups of two to sample the concrete and perform the following field tests in accordance with Standard Practice for Sampling Freshly Mixed Concrete (ASTM C-17) Slump (ASTM C 14) Air Content (ASTM C 1) Unit Weight (ASTM C 18) Custom-Crete was responsible for the batching, mixing and placement of the Ready-Mix concrete at their Brittmoore Road plant in Houston, Texas. Concrete was reported by Custom-Crete to be produced in accordance with ASTM C 685 and ASTM C 94. The concrete making materials (except for the water reducing admixture) for both the mixes were from the same sources. Upon batching and mixing, the ready-mix concrete was sampled by Terracon technicians from four different parts of the batch, including: 1 st Quarter of the batch nd Quarter of the batch rd Quarter of the batch 4 th Quarter of the batch One drum truck and one volumetric truck was provided by Custom-Crete for the scheduled batching, mixing and placement operations. One set of 6 cylinder specimens were cast for each quarter of the batch for a total of 4 specimens for each mixing method. Three concrete batches comprising of two volumetric and one drum truck, were placed on two separate placement dates. The first placement involved sampling one drum and one volumetric truck. The second placement was an additional test of the volumetric mixed concrete. The additional was required to address mix design differences in the volumetric and drum truck on the first placement. The difference between the two concrete mix batches was the use of water reducing admixture. The drum mixed concrete contained this admixture while the volumetric mixed concrete did not contain it. The second placement was also required to obtain a water to cement ratio that was similar for both the mixing methods. Reliable Responsive Convenient Innovative P a g e

4 Report of Services, Revision 1 Custom-Crete Houston, Texas December 5, 1 Terracon No Laboratory Testing After 4 hours of initial field curing, cast test cylinders were transported to our laboratory for curing and subsequent testing for compressive strength testing in accordance with ASTM C9 and ASTM C617.. TEST RESULTS The following section presents the field and laboratory testing results of concrete produced using drum and volumetric mixing methods..1 Slump: The concrete slump test results are presented in Table 1 and shown graphically in Figure 1. The slump was within the target range of to 5 inches for the three concrete mixes produced. Table 1. Concrete Slump (inches) Test Results (ASTM C 14) Mixing/Production Method Drum Mixed w/wr Volumetric Mixed w/o WR Volumetric Mixed w/wr 1 1 st Quarter of the batch nd Quarter of the batch rd Quarter of the batch th Quarter of the batch Average Additional Test Reliable Responsive Convenient Innovative P a g e

5 Slump (inch) Report of Services, Revision 1 Custom-Crete Houston, Texas December 5, 1 Terracon No Drum Mix w/ Water Reducer Volumetric Mix w/o Water Reducer Volumetric Mix w/water Reducer Q1 Q Q Q4 Concrete Batch Portion (Q = Quarter) Figure1. Concrete Slump Changes Within a Batch for Volumetric and Drum Mixed Concrete. Air Content: The concrete air content test results are presented in Table and shown graphically in Figure. The air content increased by a factor of about following the addition of ASTM C494 Type A/F water reducing admixture (WR) in the concrete that was volumetric mixed. Table. Concrete Air Content (%) Test Results (ASTM C 1) Mixing/Production Method Drum Mixed Volumetric Mixed w/o WR Volumetric Mixed w/wr 1 1 st Quarter of the batch nd Quarter of the batch rd Quarter of the batch th Quarter of the batch Average Additional Test Reliable Responsive Convenient Innovative P a g e 4

6 Air Content (%) Report of Services, Revision 1 Custom-Crete Houston, Texas December 5, 1 Terracon No Drum Mix w/ Water Reducer Volumetric Mix w/o Water Reducer Volumetric Mix w/water Reducer Q1 1 Q Q Q4 4 5 Concrete Batch Portion (Q = Quarter) Figure. Concrete Air Content Changes Within a Batch for Volumetric and Drum Mixed Concrete. Unit Weight: The concrete plastic unit weight test results are presented in Table and shown graphically in Figure. The unit weight of the volumetric mixed concrete (with water reducer) was lower by about 5 pcf in comparison to the drum mixed concrete. This can be contributed to the higher air content results observed for the same mix. Table Concrete Plastic Unit Weight (pcf) Test Results (ASTM C 18) Mixing/Production Method Drum Mixed Volumetric Mixed w/o WR Volumetric Mixed w/wr 1 1 st Quarter of the batch nd Quarter of the batch rd Quarter of the batch th Quarter of the batch Average Additional Test Reliable Responsive Convenient Innovative P a g e 5

7 Unit Weight (pcf) Report of Services, Revision 1 Custom-Crete Houston, Texas December 5, 1 Terracon No Drum Mix w/ Water Reducer Volumetric Mix w/o Water Reducer Volumetric Mix w/water Reducer Q1 1 Q Q Q4 4 5 Concrete Batch Portion (Q = Quarter) Figure. Concrete Unit Weight Changes Within a Batch for Volumetric and Drum Mixed Concrete.4 Compressive Strength: The concrete compressive strength test results are presented in Table 4 and shown graphically in Figure 4. The compressive strength on for the three mixes showed an increasing trend when compared to the age. The 8 day compressive strength of drum mixed concrete was lower compared to the volumetric mixed concrete specimens. However, this difference was less than 5 percent at 56 day test age. Table 4. Average* Concrete Compressive Strength (psi) Test Results, (ASTM C 9) Mixing/Production Method Age Drum Mixed Volumetric Mixed w/o WR Volumetric Mixed w/ WR 1 7 Day Day 485** 41** Day Additional Test *This is an average of the compressive strength test results of specimens of all the four batches at the respective test age. Reliable Responsive Convenient Innovative P a g e 6

8 Compressive Strength (psi) Report of Services, Revision 1 Custom-Crete Houston, Texas December 5, 1 Terracon No **The 8 day compressive strength test results are replaced by the day test results as they appear to be an outlier. Refer to attached concrete test report Set# for Drum Mixed concrete and test report Set#4 for Volumetric Mixed concrete Drum Mix w/water Reducer Volumetric Mix w/o Water Reducer Volumetric Mix w/water Reducer Age (days) Figure 4. Concrete Compressive Strength Versus Age for Volumetric and Drum Mixed Concrete.5 Water/Cement Ratio: The water/cementitious materials test results are presented in Table 5. Comparing the drum mixed and volumetric mixed (re-test) test results, the concrete produced using both the methods appears to be produced with the same w/c ratio. Table 5. Average* Water/Cement Ratio Mixing/Production Method Drum Mixed Volumetric Mixed w/o WR Volumetric Mixed w/wr 1 Water/Cementitious Ratio Additional Test *This is an average based on the total water added to the concrete during the production of the entire concrete batch. The water/cementitious ratio may be higher than the average reported for the entire batch. This is due to the fact that water was added during mixing based on visual evaluation of the concrete consistency. The water/cement ratio was calculated by Custom- Crete and reported to Terracon. Reliable Responsive Convenient Innovative P a g e 7

9 Report of Services, Revision 1 Custom-Crete Houston, Texas December 5, 1 Terracon No DISCUSSION AND CONCLUSIONS Based on the field and laboratory test results presented in Section. of this report, it appears that the compressive strength of the concrete shows an increasing trend over a period of 56 days in both the production methods. At any of the three test ages, the concrete produced using the volumetric method had a marginally higher strength gain compared to the concrete produced by a drum truck using similar materials and about the same water/cement ratio. The water/cement ratio of the volumetric mix produced concrete without any water reducing admixture was higher compared to the similar volumetric mix produced with the water reducing admixture. The higher water/cement ratio resulted in a little reduction in the compressive strength when compared to the volumetric mix with a water reducer. However, even with the lower water/cement ratio, the strength gain was higher compared to the drum mixed concrete at the same test ages. There was a threefold difference in the air content of concrete produced using volumetric mixing and that of drum mixed concrete. This may be attributed to the use of different make water reducing admixtures and its chemistry with the cement of the concrete. The higher air content of the volumetric mixed concrete with water reducer did not lead to a reduction in the compressive strength when compared to the results of the same mix in a drum mix truck. The slump of concrete batches produced using both methods was between to 4.5 inches. Based on the field and laboratory test results, it appears that the volumetric and drum mix production methods produce similar results when similar materials are used to produce a concrete within a specified slump, air content and water/cement ratio. The efficiencies of using either of the production methods is a question of its practicality of use on a particular project. 5. LIMITATIONS The analysis and opinions presented in this report are based upon the information provided to us by Custom-Crete, together with our field and laboratory test data. While additional conditions may exist that could alter our conclusions, we feel that reasonable means have been made to evaluate the concrete materials. This report has been prepared for the exclusive use of Custom-Crete for specific application to the project discussed and has been prepared in accordance with generally accepted engineering practices using the standard of care and skill ordinarily exercised by professional engineers practicing in this area, for a project of similar scope and nature. No warranties, either express or implied, are intended or made. It is possible that defects and/or deficiencies exist that were not readily accessible or visible. Problems may develop with time, which were not evident at the time of this assessment. The opinions and recommendations in this report should Reliable Responsive Convenient Innovative P a g e 8

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11 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /1/1 /8/11 Revision 4-56-day results, psi Drum Mix Customcrete Plant: 41 Ticket No.: 8 days No Ticket Result Specification 1/ Brittmoore Rd Number: Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Water Added Before (gal): Water Added After (gal): Sample Location: Placement Location: Clay Road Suite Reg No: F-7 1/1/1 Sample Time: 155 Dustin R. Serrano Clear 1.5 Batch Size (cy): 9 Direct Discharge 5 1st Quarter of the slab area Pavement slab at entrance drive Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type 1 A /14/1 1//1 7 85,7,1 1 B /14/1 1//1 7 84,61,99 Average (7 days), 1 C /14/1 1/1/ ,1 4,1 1 D /14/1 1/1/ ,59 4,16 Average (8 days) 4,19 1 E /14/1 /7/ ,6 4,61 1 F /14/1 /7/ ,49 4,58 Average (56 days) 4,6 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Drum Mix Method Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: 11 Reported To: Contractor: Armando Barcenas w/customcrete Finished: 15 Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page 1 of 4 CR1, 4-8-1, Rev.4

12 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /1/1 /8/11 Revision 4-56-day results, psi Drum Mix Customcrete Plant: 41 Ticket No.: 8 days Not Provid Result Specification / Brittmoore Rd Number: Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Water Added Before (gal): Water Added After (gal): Sample Location: Placement Location: Clay Road Suite Reg No: F-7 1/1/1 Sample Time: 15 Kelly R. Howes Clear.5 Batch Size (cy): 9 Direct Discharge 5 nd Quarter of the slab area Pavement slab at entrance drive Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type A /14/1 1//1 7 8,9,86 B /14/1 1//1 7 84,5,99 Average (7 days),9 C /14/1 1/1/ ,58 4,19 D /14/1 1/1/ ,84,89 Average (8 days) 4,4 E /14/1 /7/ , 4,64 F /14/1 /7/ ,5 4,69 Average (56 days) 4,67 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Drum Mix Method Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: 11 Reported To: Contractor: Armando Barcenas w/customcrete Finished: 15 Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page of 4 CR1, 4-8-1, Rev.4

13 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /1/1 /8/11 Revision 4-56-day results, psi Drum Mix Customcrete Plant: 41 Ticket No.: 8 days Not Provid Result Specification Brittmoore Rd Number: Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Water Added Before (gal): Water Added After (gal): Sample Location: Placement Location: Clay Road Suite Reg No: F-7 1/1/1 Sample Time: 111 Dustin R. Serrano Clear 5.5 Batch Size (cy): 9 Direct Discharge rd Quarter of the slab area Pavement slab at entrance drive Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type A /14/1 1//1 7 8,75,9 B /14/1 1//1 7 88,6,1 Average (7 days), C /14/1 1/1/ ,6 4,66 D /14/1 1/1/ , 5,1 Average (8 days) 4,88 E /14/1 1/1/11 117,1 4,14 F /14/1 1/1/11 116,5 4,1 Average ( days) 4,1 Comments: Compressive strength of day cylinders complies with the specified strength. Drum Mix Method Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: 11 Reported To: Contractor: Armando Barcenas w/customcrete Finished: 15 Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page of 4 CR1, 4-8-1, Rev.4

14 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /1/1 /8/11 Revision 4-56-day results, psi Drum Mix Customcrete Plant: 41 Ticket No.: 8 days Not Provid Result Specification Brittmoore Rd Number: Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Water Added Before (gal): Water Added After (gal): Sample Location: Placement Location: Clay Road Suite Reg No: F-7 1/1/1 Sample Time: 1 Kelly R. Howes Clear 8. Batch Size (cy): 9 Direct Discharge 5 4th Quarter of the slab area Pavement slab at entrance drive Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type 4 A /14/1 1//1 7 78,88,79 4 B /14/1 1//1 7 8,,84 Average (7 days),8 4 C /14/1 1/1/ ,88 4,1 4 D /14/1 1/1/ ,6,87 Average (8 days),99 4 E /14/1 /7/ ,8 4,8 4 F /14/1 /7/ ,66 4,48 Average (56 days) 4,4 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Drum Mix Method Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: 11 Reported To: Contractor: Armando Barcenas w/customcrete Finished: 15 Report Distribution: (1), Reviewed By: jerry.gaubert@oldcastleapg.com Jigar B. Desai, Ph.D., P.E. Manager Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page 4 of 4 CR1, 4-8-1, Rev.4

15 Task: 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /1/1 /8/11 Revision 4-56-day results Volumetric Mix Concrete, psi Volumetric Customcrete Plant: - Ticket No.: 8 days Not Provid Result Specification Brittmoore Rd Number: Sample Information Clay Road Suite Reg No: F-7 Sample Date: 1/1/1 Sample Time: Sampled By: Weather Conditions: Dustin R. Serrano Clear Accumulative Yards: 1.5 Batch Size (cy): Placement Method: Direct Discharge Water Added Before (gal): Water Added After (gal): Sample Location: Placement Location: 1st Quarter of the slab area Pavement slab near concrete loading area Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type 1 A /14/1 1//1 7 9,,7 1 B /14/1 1//1 7 94,8,4 Average (7 days),1 1 C /14/1 1/1/ ,4 4,4 1 D /14/1 1/1/ ,46 4, Average (8 days) 4, 1 E /14/1 /7/ ,65 4,59 1 F /14/1 /7/ ,16 4,71 Average (56 days) 4,65 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Volumetric Mixing Method Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: Reported To: Contractor: Armando Barcenas w/customcrete Finished: Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page 1 of 5 CR1, 4-8-1, Rev.4

16 Task: 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /1/1 /8/11 Revision 4-56-day results Volumetric Mix Concrete, psi Volumetric Customcrete Plant: - Ticket No.: 8 days Not Provid Result Specification 4 1/ Brittmoore Rd Number: Sample Information Clay Road Suite Reg No: F-7 Sample Date: 1/1/1 Sample Time: Sampled By: Weather Conditions: Kelly R. Howes Clear Accumulative Yards:.5 Batch Size (cy): Placement Method: Direct Discharge Water Added Before (gal): Water Added After (gal): Sample Location: Placement Location: nd Quarter of slab Pavement slab near concrete loading area Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type A /14/1 1//1 7 96,7,4 B /14/1 1//1 7 96,4,4 Average (7 days),4 C /14/1 1/1/ ,4 4,9 D /14/1 1/1/11 8 1,15 4,6 Average (8 days) 4, E /14/1 /7/ , 4,5 F /14/1 /7/ ,7 4,75 Average (56 days) 4,6 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Volumetric Mixing Method Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: Reported To: Contractor: Armando Barcenas w/customcrete Finished: Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page of 5 CR1, 4-8-1, Rev.4

17 Task: 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /1/1 /8/11 Revision 4-56-day results Volumetric Mix Concrete, psi Volumetric Customcrete Plant: - Ticket No.: 8 days Not Provid Result Specification 1/ Brittmoore Rd Number: Sample Information Clay Road Suite Reg No: F-7 Sample Date: 1/1/1 Sample Time: Sampled By: Weather Conditions: Dustin R. Serrano Clear Accumulative Yards: 5.5 Batch Size (cy): Placement Method: Direct Discharge Water Added Before (gal): Water Added After (gal): Sample Location: Placement Location: rd Quarter of slab Pavement slab near concrete loading area Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type A /14/1 1//1 7 97,4,44 B /14/1 1//1 7 97,1,44 Average (7 days),44 C /14/1 1/1/11 8 1,49 4,7 D /14/1 1/1/ ,74 4, Average (8 days) 4,9 E /14/1 /7/ ,5 4,69 F /14/1 /7/ ,7 4,64 Average (56 days) 4,67 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Volumetric Mixing Method Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: Reported To: Contractor: Armando Barcenas w/customcrete Finished: Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page of 5 CR1, 4-8-1, Rev.4

18 Task: 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /1/1 /8/11 Revision 4-56-day results Volumetric Mix Concrete, psi Volumetric Customcrete Plant: - Ticket No.: 8 days Not Provid Result Specification 4 1/ Brittmoore Rd Number: Sample Information Clay Road Suite Reg No: F-7 Sample Date: 1/1/1 Sample Time: Sampled By: Weather Conditions: Kelly R. Howes Clear Accumulative Yards: 6.75 Batch Size (cy): Placement Method: Direct Discharge Water Added Before (gal): 1 Water Added After (gal): Sample Location: Placement Location: 4th Quarter of slab Pavement slab near concrete loading area Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type 4 A /14/1 1//1 7 91,77,5 4 B /14/1 1//1 7 89,5,16 Average (7 days),1 4 C /14/1 1/1/ ,15, 4 D /14/1 1/1/ ,6,51 Average (8 days),4 4 E /14/1 1/1/11 1,45,55 4 F /14/1 1/1/11 119,1 4,1 Average ( days),88 Comments: Compressive strength of day cylinders complies with the specified strength. Volumetric Mixing Method Refer to Report#.1 for time. Page 4 of 5 CR1, 4-8-1, Rev.4

19 Task: 64 Joe Field Rd Dallas, TX /1/1 /8/11 Revision 4-56-day results Volumetric Mix Concrete 45 Brittmoore Rd Number: Clay Road Suite Reg No: F-7 Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: Reported To: Contractor: Armando Barcenas w/customcrete Finished: Report Distribution: (1), Reviewed By: jerry.gaubert@oldcastleapg.com Jigar B. Desai, Ph.D., P.E. Manager Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page 5 of 5 CR1, 4-8-1, Rev.4

20 Task: 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /17/1 /11/11 Revision - 56-day results Re-Testing Volumetric Mix, psi volumetric Customcrete Plant: NA Ticket No.: 8 days Brittmoore NA Result Specification 4 1/ to to Brittmoore Rd Number: Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Clay Road Suite Reg No: F-7 1/17/1 Sample Time: 119 Kelly R. Howes Cloudy ~.5 Batch Size (cy): Direct Discharge Water Added Before (gal): Water Added After (gal): Sample Location: Same as placement Placement Location: Customcrete Brittmoore plant misc. paving repair Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type 1 A /18/1 1/4/1 7 94,11, 1 B /18/1 1/4/1 7 94,66,5 Average (7 days),4 1 C /18/1 1/14/11 8 1, 4,5 1 D /18/1 1/14/11 8 1,1 4, Average (8 days) 4,4 1 E /18/1 /11/ ,87 4,88 1 F /18/1 /11/ ,4 4,57 Average (56 days) 4,7 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: 11 Reported To: Contractor: Armando Barcenas w/customcrete Finished: 14 Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page 1 of 5 CR1, 4-8-1, Rev.4

21 Task: 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /17/1 /11/11 Revision - 56-day results Re-Testing Volumetric Mix, psi volumetric Customcrete Plant: NA Ticket No.: 8 days Brittmoore NA Result Specification 1/4 to to Brittmoore Rd Number: Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Clay Road Suite Reg No: F-7 1/17/1 Sample Time: 17 Kelly R. Howes Cloudy ~5 Batch Size (cy): Direct Discharge Water Added Before (gal): Water Added After (gal): Sample Location: Same as placement Placement Location: Customcrete Brittmoore plant misc. paving repair Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type A /18/1 1/4/1 7 97,79,46 B /18/1 1/4/1 7 96,87,4 Average (7 days),45 C /18/1 1/14/11 8 1,5 4,5 D /18/1 1/14/ ,8 4,77 Average (8 days) 4,56 E /18/1 /11/ , 4,74 F /18/1 /11/ ,69 4,87 Average (56 days) 4,81 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: 11 Reported To: Contractor: Armando Barcenas w/customcrete Finished: 14 Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page of 5 CR1, 4-8-1, Rev.4

22 Task: 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /17/1 /11/11 Revision - 56-day results Re-Testing Volumetric Mix, psi volumetric Customcrete Plant: NA Ticket No.: 8 days Brittmoore NA Result Specification /4 to to Brittmoore Rd Number: Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Clay Road Suite Reg No: F-7 1/17/1 Sample Time: 1 Kelly R. Howes Cloudy ~7. Batch Size (cy): Direct Discharge Water Added Before (gal): Water Added After (gal): Sample Location: Same as placement Placement Location: Customcrete Brittmoore plant misc. paving repair Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type A /18/1 1/4/1 7 89,5,16 B /18/1 1/4/1 7 9,7,7 Average (7 days), C /18/1 1/14/ ,84 4,4 D /18/1 1/14/ ,87 4,17 Average (8 days) 4, E /18/1 /11/ ,89 4,67 F /18/1 /11/ ,1 4,71 Average (56 days) 4,69 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: 11 Reported To: Contractor: Armando Barcenas w/customcrete Finished: 14 Report Distribution: (1), jerry.gaubert@oldcastleapg.com Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page of 5 CR1, 4-8-1, Rev.4

23 Task: 64 Joe Field Rd Dallas, TX 759 Material Information Specified Strength: Mix ID: Supplier: Batch Time: Truck No.: Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): /17/1 /11/11 Revision - 56-day results Re-Testing Volumetric Mix, psi volumetric Customcrete Plant: NA Ticket No.: 8 days Brittmoore NA Result Specification 1/4 to to Brittmoore Rd Number: Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Clay Road Suite Reg No: F-7 1/17/1 Sample Time: 116 Kelly R. Howes Clear ~8.5 Batch Size (cy): Direct Discharge Water Added Before (gal): Water Added After (gal): Sample Location: Same as placement Placement Location: Customcrete Brittmoore plant misc. paving repair Laboratory Test Data Age at Maximum Compressive Set Specimen Diameter Area Date Date Test Load Strength Fracture No. ID (in) (sq in) Received Tested (days) (lbs) (psi) Type 4 A /18/1 1/4/1 7 91,18, 4 B /18/1 1/4/1 7 88,65,14 Average (7 days),19 4 C /18/1 1/14/ ,54 4,51 4 D /18/1 1/14/ ,95 4, Average (8 days) 4,7 4 E /18/1 /11/ ,96 4,5 4 F /18/1 /11/ ,98 4,46 Average (56 days) 4,5 Comments: Compressive strength of 56 day cylinders complies with the specified strength. Re-testing of volumetric mix concrete. First testing performed on 1/1/1. Page 4 of 5 CR1, 4-8-1, Rev.4

24 Task: 64 Joe Field Rd Dallas, TX /17/1 /11/11 Revision - 56-day results Re-Testing Volumetric Mix 45 Brittmoore Rd Number: Clay Road Suite Reg No: F-7 Samples Made By: Terracon Services: Obtain samples of fresh concrete at the placement locations (ASTM C-17), perform required field tests and cast, cure, and test compressive strength samples (ASTM C-1 (with the exception of Section 1.1.), C-9, C-617). Terracon Rep.: Kelly R. Howes Started: 11 Reported To: Contractor: Armando Barcenas w/customcrete Finished: 14 Report Distribution: (1), Reviewed By: jerry.gaubert@oldcastleapg.com Jigar B. Desai, Ph.D., P.E. Manager Test Methods: ASTM C18, ASTM C14, ASTM C17, ASTM C164 Page 5 of 5 CR1, 4-8-1, Rev.4