Chapter 3. Bituminous Patching Materials SECTION ACCEPTANCE OF PRE-MIX PATCH MATERIAL

Transcription

1 Chapter 3 Bituminous Patching Materials SECTION ACCEPTANCE OF PRE-MIX PATCH MATERIAL The Stockpile Patching Material shall be manufactured at the Bituminous Concrete Manufacturer's request in the presence of a qualified Department representative. Liquid Bituminous Material for the Stockpile Patching mix shall be procured according to Bulletin The mixed material may be manufactured and stockpiled in sufficient amounts to meet the producers estimated requirements for the ensuing season. When permitted, the bituminous mixture may be delivered directly to a Department stockpile at the contractor's risk. Material failing to receive District approval after stocking shall be removed by the contractor within two weeks of written notification. Payment will be withheld for the delivered material failing to meet District approval except in such cases where the Engineer deems the deviation to be of a minor nature that will not affect the serviceability of the material Each stockpile shall be assigned a sequential lot number starting with No. 1 each January 1st of the year of manufacture. The lot number will consist of the supplier code, obtained from Bulletin 41, and the sequential lot number. Example: ACK 15A-80-1 Ackworth Materials Corp., Ackworth Station, 1980 Lot No. 1. Material going from one district to another shall retain the same lot number as designated in the originating district The producer must document his production quantities and quality control testing. The Department's representative shall review the plant's production documentation to verify that the stockpile patching material meets specification requirements When a stockpile is approved by the District, the approval will be extended to cover all purchase orders current or future, until the stockpile is exhausted, or otherwise disposed of, during the current season An accurate record of shipments, and an inventory of each approved stockpile, shall be maintained by Department and producer's representatives Documentation of the exact quantities in individual shipments of approved material to all Maintenance Districts shall be made in accordance with current instructions The approved stockpile may be rejected by the District Materials Engineer or his representative at anytime during delivery or in stockpile if the material fails to retain asphalt binder coating and lacks workability. 3-1 Change 2

2 483.9 All stockpiles will be resampled and tested 6 months after original approval, or if requested, the material may be released for disposal to other agencies or usages at the producer's discretion. (a) Delivery of Mixture. The mixture shall be hauled to the designated worksite as required in Section 401.3(c). 3-2 Change 2

3 SECTION BITUMINOUS STOCKPILE PATCHING MATERIAL DESCRIPTION - The material shall consist of plant mixed stockpile patching bituminous mixture composed of mineral aggregate coated with bituminous material. The material shall be capable of being stocked for at least six months without stripping and shall be workable at all times. Stocked patching material may be rejected, at any time during the six month period if, in the opinion of the District Materials Engineer, the patching material has stripped (more than 10% uncoated particles) or otherwise become unfit for use. When the patching material has been delivered directly to a Department stockpile before Department approval, it will be the contractor's responsibility to remove any unacceptable material within two weeks of notification. Refusal by the contractor to remove unacceptable material from the Department stocking area will be sufficient grounds to suspend the contractor from the Department's bidding list for patching material, until such time as the problem is resolved to the satisfaction of the Department. This material is intended for patching holes up to 75 mm (3 inches) deep MATERIALS - The material and their use shall meet the applicable requirements of Section 703 and Bulletin 25. (a) Bituminous Materials. The listed bituminous materials shall be used. For proper mixing, the bituminous materials shall be heated as specified in Section The bituminous materials may be specified by the Department in the bid proposal. Class of Material Type of Material MC-400 Cut-back Petroleum Asphalt MC-800 Cut-back Petroleum Asphalt E-10 Emulsified Asphalt CMS-2s Cationic Emulsified Asphalt Bituminous Material MC-400 shall be used between November 1 and March 1. Bituminous Material MC-800 shall be used between March 1 and October 31. Bituminous materials E-10 and CMS-2s can be used throughout the year. Bituminous Materials MC-400 and MC-800 shall be Treated Bituminous Materials meeting the applicable requirements of AASHTO T 182, dry and wet aggregate coating test with Cutback Asphalt, using the job aggregate. Bituminous Materials E-10 and CMS-2s shall pass the stone coating test on the job aggregate, as described in AASHTO T Change 2

4 The contractor shall furnish the sample of the job aggregate each year to the bituminous supplier for the coating and stripping tests specified in AASHTO T 59 and AASHTO T 182; and obtain a certificate that the bituminous material has been treated to suit the job aggregate. This yearly certificate must be on file and shall be available at the bituminous plant when required by the Engineer. A copy shall also be forwarded by the contractor to the District Materials Engineer/Manager. (b) Fine Aggregate. The fine aggregate shall be Type A or B material meeting the quality requirements of Section (c) Coarse Aggregate. The coarse aggregate shall be Type A material meeting the quality requirements of Section (d) Composition of Mixtures. The percent of asphalt residue and the percent passing the 2.36 mm (No. 8) sieve shall be approved by the Engineer. The contractor shall furnish the mixed material within the gradation limits (master range) specified in Table A. Acceptance of the mixed material shall be on the averaged test results of a sample of three increments. To ensure uniformity of the mixture, the average of the test results for asphalt residue content shall not exceed ±0.5% and no individual tests shall vary more than ±1.0% from the JMF. TABLE A Composition of Mixtures (Total Percent by Mass Passing Square Openings Based on Laboratory Sieve Tests) Passing Sieve Percent Passing 9.5 mm (3/8") mm (No. 8) µm (No. 100) 0-10 The quantity of bituminous material in the mix shall be such that the minimum requirements on the percent residue specified in Table B are met. The contractor shall furnish the mixed material within the limits specified in Table A and Table B of this section, except, the asphalt residue shall not be deficient by more that 0.5 percent and the 2.36 mm (No. 8) sieve shall not vary more than ±5% from the JMF values approved by the Engineer. Exceptional cases where the requirements of Table B are difficult to meet, shall be referred to the Chief, Materials and Testing Division, Harrisburg for approval. 3-4 Change 2

5 Aggregate Type Stone and Gravel Slag TABLE B Minimum Asphalt Residue for JMF Design Percent Water Absorption (Coarse Aggregate) Percent Asphalt Residue, Min. JMF Design Less than to to to to to Less than to to to Based on the characteristics of the aggregate and the performance (workability and durability) of the mix, the Engineer can specify percent asphalt or tar residue higher than the minimum values given in Table B CONSTRUCTION REQUIREMENTS (a) Bituminous Mixing Plant. All plants manufacturing this material shall meet the requirements of Section (b) Preparation of Mixtures. All mineral aggregates and bituminous material shall be proportioned by mass or by volume. The mixture shall be such that it may be stocked, handled, placed and finished without stripping of the bituminous material from the aggregate. To help prevent stripping, the mixed material shall be stocked no higher than 1.2 meters (4 feet) for the first 48 hours. The mineral aggregate shall be clean and surface dry prior to mixing. The temperatures of the bituminous material, aggregate and the resulting mixture shall be maintained as follows: Temperature Range o C (F) Bituminous Aggregate Bituminous Material Material Mixture MC (40-140) ( ) -- MC (40-140) ( ) -- E-10 and CMS-2s Appropriate for specified mix temperature ( ) ( ) 3-5 Change 2

6 When E-10 or CMS-2s Emulsified Asphalts are used, the temperature requirements on the aggregate and the mixture can be waived by the Engineer, if it is demonstrated that the mix can be prepared with unheated aggregate without any coating or stripping problems, during production and stockpiling. To help prevent drainage of the bituminous binder in the stockpile, the mixing temperature shall be held as low as practicable within the ranges specified above. The following two tests on the mixture, freshly prepared or taken from the stockpile, shall be performed by the contractor in the presence of a Department representative or performed by District personnel. The mixture shall be rejected if it fails these tests. Water Resistance Test Place approximately 100 grams of uncured mixture into a clean one liter (one quart) Mason jar. Fill the jar about half full with distilled water and place the lid loosely on top. Place the jar in an oven at 60 ± 3 o C (140 ± 5 o F) for 16 to 18 hours. Remove the jar from over, tighten lid and shake vigorously for 5 minutes. Decant the water from jar and spread the mixture on an absorbent paper for visual observation of the coating. The aggregate shall be at least 90% coated with a bituminous film. Workability Test Approximately 2 kg (five pounds) of the mixture shall be cooled to -7 o C (20 o F) in the laboratory. After cooling the mixture shall be capable of being broken up readily with a spatula having a blade length of approximately 200 mm (8 inches). This test shall be performed when the mixture is produced or used between November 1 and March 1. If the mixture is not workable at -7 o C (20 o F), it shall be rejected and proper modification to the composition of the mixture (such as an increase in percent asphalt residue or gradation changes) shall be made. (c) Inspection, Sampling and Approval. Inspection, sampling and approval shall conform to the requirements of Section 483. Failure to comply with these requirements may be cause to suspend plant approval for the production of stockpile patching material. (d) Delivery of Mixture. When delivered as a hot mixture it shall be hauled to the work site as required in Section 401.3(c) and have satisfactory workability and setting quality at the time of delivery METHOD OF MEASUREMENT - The tonnage will be measured and determined from the actual plant batch reports as recorded by a representative of the Department assigned to the work BASIS OF PAYMENT - The bituminous stockpile patching material will be paid for at the contract unit price per tonne (ton), at the work site or other destination as specified in the proposal. 3-6 Change 2

7 SECTION BITUMINOUS STOCKPILE PATCHING MATERIAL DESCRIPTION - The material shall consist of plant mixed stockpile patching bituminous mixture composed of mineral aggregate coated with bituminous material. The material shall be capable of being stocked for at least six months without stripping and shall be workable at all times. Stocked patching material may be rejected, at any time during the six month period if, in the opinion of the District Materials Engineer, the patching material has stripped (more than 10% uncoated particles) or otherwise become unfit for use. When the patching material has been delivered directly to a Department stockpile before Department approval, it will be the contractor's responsibility to remove any unacceptable material within two weeks of notification. Refusal by the contractor to remove unacceptable material from the Department stocking area will be sufficient grounds to suspend the contractor from the Department's bidding list for patching material, until such time as the problem is resolved to the satisfaction of the Department. This material is intended for patching holes up to 75 mm (3 inches) deep MATERIALS - The material and their use shall meet the applicable requirements of Section 703 and Bulletin 25. (a) Bituminous Materials. The listed bituminous materials shall be used. For proper mixing, the bituminous materials shall be heated as specified in Section Class of Material Type of Material MC-400 Cut-back Petroleum Asphalt MC-800 Cut-back Petroleum Asphalt E-10 Emulsified Asphalt CMS-2s Cationic Emulsified Asphalt Bituminous Material MC-400 shall be used between November 1 and March 1. Bituminous Material MC-800 shall be used between March 1 and October 31. Bituminous Material E-10 and CMS-2s can be used throughout the year. Bituminous Materials MC-400 and MC-800 shall be Treated Bituminous Materials meeting the applicable requirements of AASHTO T 182, dry and wet aggregate coating test with Cutback Asphalt, using the job aggregate. Bituminous Materials E-10 and CMS-2s shall pass the stone coating test on the job aggregate, as described in AASHTO T Change 2

8 The contractor shall furnish the sample of the job aggregate each year to the bituminous supplier for the coating and stripping tests specified in AASHTO T 59 and AASHTO T 182; and obtain a certificate that the bituminous material has been treated to suit the job aggregate. This yearly certificate must be on file and shall be available at the bituminous plant when required by the Engineer. A copy shall also be forwarded by the contractor to the District Materials Engineer/Manager. (b) Fine Aggregate. The fine aggregate shall be Type A or B material meeting the quality requirements of Section (c) Coarse Aggregate. The coarse aggregate shall be type A material meeting the quality requirements of Section (d) Composition of Mixtures. The percent of asphalt residue and the percent passing the 2.36 mm (No. 8) sieve shall be approved by the Engineer. The contractor shall furnish the mixed material within the gradation limits (master range) specified in Table A. The percent passing the 2.36 mm (No. 8) sieve shall not be less than 15 percent in the JMF design. Acceptance of the mixed material shall be on the averaged test results of a sample of three increments. To ensure uniformity of the mixture the average of the three tests for asphalt residue content shall not exceed +0.5% and no individual test shall vary more than +1.0% from the JMF. The average of the three test for percent passing the 75 µm (No. 200) sieve shall not exceed 2.4% and no individual test shall exceed 3.5%. TABLE A Composition of Mixtures (Total Percent by Mass Passing Square Openings Based on Laboratory Sieve Tests) Passing Sieve Percent Passing 9.5 mm (3/8") mm (No. 4) mm (No. 8) µm (No. 200) 0-2 The quantity of bituminous material in the mix shall be such that the minimum requirements on the percent residue specified in Table B are met. Based on the characteristics of the aggregate and the performance of the mix, the Engineer can specify percent asphalt or tar residue higher than the minimum values given in Table B. The contractor shall furnish the mixed material within the limits specified in Table A and Table B of this section, except, the asphalt residue shall not be deficient by more than 0.5 percent and the 2.36 mm (No. 8) sieve shall not vary more than ± 5% from the JMF values approved by the Engineer. 3-8 Change 2

9 Exceptional cases where the requirements of Table B are difficult to meet, shall be referred to the Chief, Materials and Testing Division, Harrisburg for approval. Aggregate Type Stone and Gravel Slag TABLE B Minimum Asphalt Residue for JMF Design Percent Water Absorption (Coarse Aggregate) CONSTRUCTION REQUIREMENTS Percent Asphalt Residue, Min. JMF Design Less than to to to to Less than to to to (a) Bituminous Mixing Plant. All plants manufacturing this material shall meet the requirements of Section (b) Preparation of Mixtures. All mineral aggregates and bituminous material shall be proportioned by mass or by volume. The mixture shall be such that it may be stocked, handled, placed and finished without stripping of the bituminous material from the aggregate. To help prevent stripping, the mixed material shall be stocked no higher than 1.2 meters (4 feet) for the first 48 hours. The mineral aggregate shall be clean and surface dry prior to mixing. The temperatures of the bituminous material, aggregate and the resulting mixture shall be maintained as follows: Temperature Range o C (F) Bituminous Aggregate Bituminous Material Material Mixture MC (40-140) ( ) -- MC (40-140) ( ) -- E-10 and CMS-2s Appropriate for specified mix temperature ( ) ( ) When E-10 or CMS-2s Emulsified Asphalts are used, the temperature requirements on the aggregate and the mixture can be waived by the Engineer, if it is 3-9 Change 2

10 demonstrated that the mix can be prepared with unheated aggregate without any coating or stripping problems, during production and stockpiling. To help prevent drainage of bituminous binder in the stockpile, the mixing temperature shall be held as low as practicable within the ranges specified above. The following two tests on the mixture, freshly prepared or taken from the stockpile, shall be performed by the contractor in the presence of a Department representative. The mixture shall be rejected if it fails these tests. Water Resistance Test Place approximately 100 grams of uncured mixture into a clean one liter (one Quart) Mason Jar. Fill the jar about half full with distilled water and place the lid loosely on top. Place the jar in an oven at 60 ± 3 o C (140 ± 5 o F) for 16 to 18 hours. Remove the jar from oven, tighten lid and shake vigorously for 5 minutes. Decant the water from jar and spread the mixture on an absorbent paper for visual observation of the coating. The aggregate shall be at least 90% coated with a bituminous film. Workability Test Approximately 2.5 kg (five pounds) of the mixture shall be cooled to -7 o C (20 o F) in the laboratory. After cooling the mixture shall be capable of being broken up readily with a spatula having a blade length of approximately 200 mm (8 inches). This test shall be performed when the mixture is produced or used between November 1 and March 1. If the mixture is not workable at -7 o C (20 o F), it shall be rejected and proper modification to the composition of the mixture (such as an increase in percent asphalt residue or gradation changes) shall be made. (c) Inspection, Sampling and Approval. Inspection, sampling and approval shall conform to the requirements of Section 483. Failure to comply with these requirements may be cause to suspend plant approval for the production of stockpile patching material. (d) Delivery of Mixture. When delivered as a hot mixture it shall be hauled to the work site as required in Section 401.3(c) and have satisfactory workability and setting quality at the time of delivery METHOD OF MEASUREMENT - The tonnage will be measured and determined from the actual plant batch reports as recorded by a representative of the Department assigned to the work BASIS OF PAYMENT - The bituminous stockpile patching material will be paid for at the contract unit price per tonne (ton), at the work site or other destination as specified in the proposal Change 2

11 SECTION BITUMINOUS STOCKPILE PATCHING MATERIAL (FIBER MODIFIED) DESCRIPTION - The material shall consist of plant mixed stockpile patching bituminous mixture composed of a blend of fibers and mineral aggregate coated with bituminous material. The material shall be capable of being stocked for at least six months without stripping and shall be workable at all times. Stocked patching material may be rejected, at any time during the six month period if, in the opinion of the District Materials Engineer, the patching material has stripped (more than 10% uncoated particles) or otherwise become unfit for use. When the patching material has been delivered directly to a Department stockpile before Department approval, it will be the contractor's responsibility to remove any unacceptable material within two weeks of notification. Refusal by the contractor to remove unacceptable material from the Department stocking area will be sufficient grounds to suspend the contractor from the Department's bidding list for patching material, until such time as the problem is resolved to the satisfaction of the Department. This material is intended for patching holes up to 75 mm (3 inches) deep MATERIALS - The material and their use shall meet the applicable requirements of Section 703 and Bulletin 25. (a) Bituminous Materials. The listed bituminous materials shall be used. For proper mixing, the bituminous materials shall be heated as specified in Section Class of Material Type of Material MC-400 Cut-back Petroleum Asphalt MC-800 Cut-back Petroleum Asphalt E-10 Emulsified Asphalt CMS-2s Cationic Emulsified Asphalt Bituminous Material MC-400 shall be used between November 1 and March 1. Bituminous Material MC-800 shall be used March 1 and October 31. Bituminous Material E-10 and CMS-2s can be used throughout the year. Bituminous Materials MC-400 and MC-800 shall be Treated Bituminous Materials meeting the applicable requirements of AASHTO T 182, dry and wet aggregate coating test with Cutback Asphalt, using the job aggregate. Bituminous Materials E-10 and CMS-2s shall pass the stone coating test on the job aggregate, as described in AASHTO T 59. The contractor shall furnish the sample of the job aggregate each year to the bituminous supplier for the coating and stripping tests specified in AASHTO T 59 and 3 11 Change 2

12 AASHTO T 182; and obtain a certificate that the bituminous material has been treated to suit the job aggregate. This yearly certificate must be on file and shall be available at the bituminous plant when required by the Engineer. A copy shall also be forwarded by the contractor to the District Materials Engineer/Manager. (b) Fine Aggregate. The fine aggregate shall be Type A or B material meeting the quality-requirements of Section (c) Coarse Aggregate. The coarse aggregate shall be Type A material meeting the quality requirements of Section (d) Fiber. All fibers shall be from an approved source as listed in Bulletin 15, "Approved Construction Materials". Each shipment of fibers shall be accompanied by a certificate from the supplier in accordance with Section The manufacturer shall supply to the stockpile patch producer technical information covering the quantity of fiber, additional asphalt requirements, and mixing procedures for the percentages listed in Bulletin 15. (e) Composition of Mixtures. The percent of asphalt residue and the percent passing the 2.36 mm (No. 8) sieve shall be approved by the Engineer. The contractor shall furnish the mixed material within the gradation limits (master range) specified in Table A. The percent passing the 2.36 mm (No. 8) sieve shall not be less than 15 percent in the JMF design. To ensure uniformity of the mixture, the average of the three tests for asphalt residue content shall not vary more than + 0.5% and no individual test shall vary more than + 1.0% from the JMF No individual test for material passing the 75 µm (No. 200) sieve shall exceed 5.4%. TABLE A Composition of Mixtures (Total Percent by Mass Passing Square Openings Based on Laboratory Sieve Tests) Passing Sieve Percent Passing 9.5 mm (3/8") mm (No. 4) mm (No. 8) µm (No. 200) 0-5 Fibers As indicated in Bulletin 15 The quantity of bituminous material in the mix shall be such that the minimum requirements on the percent residue specified in Table B are met. The addition of fibers will require an adjusted asphalt content. The fiber modified mix will require additional asphalt (normally 0.2 to 0.3 percent by mass of the mix) as listed in Bulletin Change 2

13 Aggregate Type Stone and Gravel Slag TABLE B Minimum Asphalt Residue for JMF Design Percent Water Absorption (Coarse Aggregate) Percent Asphalt Residue, Min. JMF Design Less than to to to to Less than to to to Based on the characteristics of the aggregate and the performance of the mix, the Engineer can specify a percent asphalt residue higher than the minimum values given in Table B. The contractor shall furnish the mixed material within the limits specified in Table A and Table B of this section, except, the asphalt residue shall not be deficient by more than 0.5 percent and the 2.36 mm (No. 8) sieve shall not vary more than + 5% from the JMF values approved by the Engineer. Exceptional cases where the requirements of Table B are difficult to meet, shall be referred to the Chief, Materials and Testing Division, Harrisburg for approval CONSTRUCTION REQUIREMENTS (a) Bituminous Mixing Plant. The plant manufacturing this material shall either be a hot-mix plant meeting the requirements of Section or an approved synchronized volume-proportioning stabilization or stationary plant meeting the following requirements: The plant shall have aggregate bins and a bituminous tank of sufficient capacity, with heating facilities when required, to assure a constant supply and proper proportioning of materials. The plant shall have a positive-driven feed to proportion the aggregates from the bins and a positive pump to proportion the bituminous material from the tank. Feeder and pump shall be synchronized to discharge the aggregates and bituminous material in the desired proportion for mixing. The plant shall be calibrated prior to actual use. The plant shall be capable of mixing the fiber and aggregate together without fiber clumping until the fiber is uniformly distributed throughout the aggregate. The plant shall be capable of mixing the materials until the fiber and aggregate are uniformly coated with the bituminous material without fiber clumping Change 2

14 Only fully automated mobile plants shall be permitted. (b) Preparation of Mixtures. All mineral aggregates, fiber, and bituminous material shall be proportioned by mass or by volume. The mixture shall be such that it may be stocked, handled, placed and finished without stripping of the bituminous material from the aggregate. To help prevent stripping, the mixed material shall be stocked no higher than 1.2 meters (4 feet) for the first 48 hours. The mineral aggregate shall be clean and surface dry prior to mixing. The temperatures of the bituminous material, aggregate and the resulting mixture shall be maintained as follows: Temperature Range o C (F) Bituminous Aggregate Bituminous Material Material Mixture MC (40-140) ( ) -- MC (40-140) ( ) -- E-10 and CMS-2s Appropriate for specified mix temperature ( ) ( ) When E-10 or CMS-2s Emulsified Asphalts are used, the temperatures requirements on the aggregate and the mixture can be waived by the Engineer, if it is demonstrated that the mix can be prepared with unheated aggregate without any coating or stripping problems, during production and stockpiling. To help prevent drainage of bituminous binder in the stockpile, the mixing temperature shall be held as low as practicable within the ranges specified above. The following two tests on the mixture, freshly prepared or taken from the stockpile, shall be performed by the contractor in the presence of a Department representative. The mix shall be rejected if it fails these tests. Water Resistance Test Place approximately 100 grams of uncured mixture into a clean one liter (one quart) mason jar. Fill the jar about half full with distilled water and place the lid loosely on top. Place the jar in an oven at 60 ± 3 o C ( o F) for 16 to 18 hours. Remove the jar from oven, tighten lid and shake vigorously for 5 minutes. Decant the water from the jar and spread the mixture on an absorbent paper for visual observation of the coating. The aggregate shall be at least 90% coated with a bituminous film Change 2

15 Workability Test Approximately 2.5 kg (five pounds) of the mixture shall be cooled to -7 o C (20 o F) in the laboratory. After cooling the mixture shall be capable of being broken up readily with a spatula having a blade length of approximately 200 mm (8 inches). This test shall be performed when the mixture is produced or used between November 1 and March 1. If the mixture is not workable at -7 o C (20 o F), it shall be rejected and proper modification to the composition of the mixture (such as an increase in percent asphalt residue or gradation changes) shall be made. (c) Inspection, Sampling and Approval. Inspection, sampling and approval shall conform to the requirements of Section 483. Failure to comply with these requirements may be cause to suspend plant approval for the production of stockpile patching material. (d) Delivery of Mixture. When delivered as a hot mixture it shall be hauled to the work site as required in Section 401.3(c) and have satisfactory workability and setting quality at the time of delivery METHOD OF MEASUREMENT - The tonnage will be measured and determined from the actual plant batch reports as recorded by a representative of the Department assigned to the work BASIS OF PAYMENT - The bituminous stockpile patching material will be paid for at the contract unit price per tonne (ton), at the work site or other destination as specified in the proposal Change 2