Latex Modified Mortar or Concrete Wearing Course

Transcription

1 PennDOT Engineering District 8-0 Latex Modified Mortar or Concrete Wearing Course Publication 408 Section 1042 Justin M. Enck, E.I.T. Civil Engineer Structure Control Unit District 8-0

2 Latex Modified Mortar or Concrete Mortar: depth < 1 ¼ inches Concrete: depth 1 ¼ inches

3 Latex Modified Mortar or Concrete Section I: New Operating Procedures Section II: Upcoming Specification Changes Section III: Truck Calibration Section IV: Surface Preparation and Latex Placement Section V: Calibration Example

4 Latex Modified Mortar or Concrete Section I: New Operating Procedures

5 Section I: New Operating Procedures Conditioning of aggregates Minimal 7 hours of sprinkling with potable water for course aggregates prior to pour Rotation of stockpiles ensures uniform moisture content There should be no visible dry spots Properly conditioned stockpiles will not result in a negative surface moisture content Check calculations SSSSSSS MMMMMMMM = SSSSSS WWWWWW oo AAA. DDDDD SSSSSS WWWWWW oo AAA. DDDDD SSSSSS WWWWWW oo AAA. 111 AAAAAAAAA

6 Section I: New Operating Procedures Conditioning of aggregates Minimal 7 hours of sprinkling with potable water for course aggregates prior to pour Rotation of stockpiles ensures uniform moisture content There should be no visible dry spots Properly conditioned stockpiles will not result in a negative surface moisture content Check calculations SSSSSSS MMMMMMMM = SSSSSS WWWWWW oo AAA. DDDDD SSSSSS WWWWWW oo AAA. DDDDD SSSSSS WWWWWW oo AAA. 111 AAAAAAAAA

7 Section I: New Operating Procedures Hydrodemolitioned Decks Surfaces A third spud vibrator shall be used Snake third spud vibrator transversely across the entire deck surface Each pass shall not exceed the previous pass by 12 inches Vibrator shall stay in the latex on the deck during the pour to ensure the entire deck surface is being vibrated 4 total available 3 operating and 1 spare

8 Section I: New Operating Procedures Final Checks *SHOULD NOT BE A NEW OPERATING PROCEDURE* Upon completion of the latex pour conduct a final check for each truck This ensures that the calibration was done correctly and the correct water-to-cement ratio was placed on the deck Record the final cement count number

9 Latex Modified Mortar or Concrete Section II: Upcoming Specification Changes Change#6 Effective for project s LET date after April 4, 2014

10 Section II: Upcoming Specification Changes Calibration Calibrate using the maximum w/c ratio, cement, and aggregates listed on the approved mix design Verify mix compatibility and workability during the yield test, if directed

11 Section II: Upcoming Specification Changes Mixing and Delivery Control Tolerance of Course Aggregate, weight % = ±2.0

12 Section II: Upcoming Specification Changes Loading Upon arrival empty the aggregate bins Empty cement bin and latex tank unless verified in writing by a Department Representative they were used on a previous project Or Obtain Samples of the liquid latex admixture and cement and deliver to the Representative, the Representative will submit the samples to LTS for testing

13 Section II: Upcoming Specification Changes Loading Continued Circulate and mix latex tank as recommended by the latex manufacturer Charge aggregate bins no more than (12) 6 hours before time of scheduled placement unless otherwise approved by the representative

14 Section II: Upcoming Specification Changes Loading Continued Aggregate maintained in a uniform wet condition before loading No dry spots! Determine amount of free water on the aggregates at the time of loading by performing the aggregate moisture tests. AASHTO T255. Adjust the mix proportions to account for the amount of available free water

15 Section II: Upcoming Specification Changes Surface Preparation Protect prepared deck surface against contamination by covering with clean full width polyethylene sheeting until the overlay operations are completed Utilize Water Blast Equipment having a minimum 7500psi of pressure Wet down the deck not more than one hour prior to placement

16 Section II: Upcoming Specification Changes Placing and Finishing Contractors must prepare and submit field operations QC Plan for review and acceptance by the Representative, as outlined on CS-1042 Include a list of key personnel and relevant experience For placements not completed in the daylight provide adequate lighting as on the field operation QC Plan Ensure lighting allows proper placement, testing, and inspection operations of the entire surface area and until curing covers are placed over the surface area No two cycle (gas/oil) powered equipment on the prepared deck Use a fogger/mister to dampen any visible dry spots

17 Section II: Upcoming Specification Changes Curing and Protection Begin curing as soon as latex has been placed, finished, and textured, if applicable Curing Temperatures and Records of Temperature Maintain temperatures of 45F or greater through out the wet and dry cure period If temperature drops below 45F do not count that day as a curing day Less than 35F = work unsatisfactory and will be rejected

18 Section II: Upcoming Specification Changes Curing and Protection Continued Begin curing as soon as latex has been placed, finished, and textured, if applicable Wet Cure Within 15 minutes of covering with wet burlap, place a layer of white polyethylene film, 4 mil minimum thickness, on the wet burlap and cure the surface as specified in Table A Dry Cure After wet-curing, remove the curing covers and dry cure for an additional period, as specified in Table A Maintain the surface of the overlay in a dry condition for the entire dry cure period Cover the surface with waterproof coverings as required If the overlay surface becomes wet, extend the dry cure period to the equivalent time that the overlay surface was wet

19 Section II: Upcoming Specification Changes Limitations of Operations Place latex when the ambient and substrate deck temperatures are between 45F and 85F. Place latex at a plastic latex mixture temperature between 50F 85F When ambient temperatures are above 80F, conduct the overlay at night or early morning hours, when directed by the Representative

20 Section II: Upcoming Specification Changes Limitations of Operations Continued When ambient temperature is expected to reach 80F at anytime 24 hours before the overlay placement, take any steps necessary, but not limited to the following to mitigate the mix component temperatures that are acceptable to the Representative: Cover the latex admixture tanker and cement tanker with wet burlap or position them in shaded areas Condition the aggregates with cool water, cover with light-colored tarps and/or stockpile in shaded areas Charge the water tank on the mobile mixer with cool water as close to the time of placement as possible, or condition with ice Park mobile mixers in shaded areas or cover with wet burlap before placement Bring in a refer truck to cool down the latex

21 Latex Modified Mortar or Concrete Section III: Truck Calibration

22 Section III: Truck Calibration Prior to Calibrating Contractor/Technician should run moisture tests on fine and coarse aggregate materials Aggregate piles should be covered (maintain moisture) Do not load trucks more than 12 hours before calibration and/or latex placement

23 Section III: Truck Calibration Record project information & truck identification (Calibration Sheet) (Batcher-Mixer Slip)

24 Section III: Truck Calibration

25 Section III: Truck Calibration Calculate Gallons of Water In Latex (Mix Design) (Batcher-Mixer Slip) (Mix Design)

26 Section III: Truck Calibration Calculate Moisture Weight Found on mix design (Batcher-Mixer Slip) SSSSSSS MMMMMMMM = SSSSSS WWWWWW oo AAA. DDDDD SSSSSS WWWWWW oo AAA. DDDDD SSSSSS WWWWWW oo AAA. 111 AAAAAAAAA

27 Section III: Truck Calibration Calculate Target Weights from Mix Design mix design is based on 7 bags of cement/cy target weights based on amount of material per bag Material Acceptance Target Cement Weight + (0% to 4%) + 2% Fine Aggregate Weight + (+/- 2%) 0% Coarse Aggregate Weight + (+/- 1%) 0% Latex Weight + (+/- 2%) 0% Water Weight + (+/- 1%) 0%

28 Section III: Truck Calibration Run Cement Calibration at least 3 consecutive runs within range (Target = 1 bag (94 lbs.) + 2%) (Calibration Sheet)

29 Section III: Truck Calibration use for cement (Calibration Worksheet)

30 Section III: Truck Calibration

31 Section III: Truck Calibration Run Fine Aggregate Calibration (Target = Calibrated Wt.) **7 bags/cy** **Time from Cement Calibration** = WWWWWW BBB % MMMMMMMM 111 Calibrated Wt. (+/- 2%) (Calibration Sheet)

32 Section III: Truck Calibration use for sand, stone, latex, water (Calibration Worksheet)

33 Section III: Truck Calibration Run Coarse Aggregate Calibration (Target = Calibrated Wt.) = WWWWWW BBB % MMMMMMMM 111 Calibrated Wt. (+/- 1%) (Calibration Worksheet)

34 Section III: Truck Calibration Water Gage

35 Section III: Truck Calibration

36 Section III: Truck Calibration

37 Section III: Truck Calibration Run Latex Calibration (Target = Calibrated Wt.) Typical Design = 24.5 gallons of Latex per CY Calibrated Wt. (+/- 2%) (Calibration Worksheet)

38 Section III: Truck Calibration

39 Section III: Truck Calibration Run Water Calibration (Target = Theo. Wt.) Typically use 1 minute (60 sec.) Calibration = Theo. Wt. (+/- 1%) (Calibration Worksheet)

40 Section III: Truck Calibration Calculate water gage setting ranges (Calibration Worksheet)

41 Section III: Truck Calibration Calculate water gage setting ranges Typically Design W/C = (W-C GPM Sheet)

42 Section III: Truck Calibration Calculate water gage setting ranges (Batcher-Mixer Slip) (Batcher-Mixer Slip) From Batcher Mixer Slip (W-C GPM Sheet)

43 Section III: Truck Calibration (Batcher-Mixer Slip)

44 Section III: Truck Calibration (W-C GPM Sheet)

45 Section III: Truck Calibration (W-C GPM Sheet)

46 Section III: Truck Calibration Total design gal.s of water / CY amount of water in latex Total max. gal.s of water / CY amount of water in latex Gal.s to be added X 60 7 X Cement Calib. Time (Batcher-Mixer Slip)

47 Section III: Truck Calibration Cement Meter? Count X 7 Bags (Batcher-Mixer Slip)

48 Section III: Truck Calibration Upon completion of truck calibration, the following tests should be performed to assure material is within spec: perform air content test (range = 1% to 7%) perform slump test (range = 3 to 7 ) perform ¼ cy yield test Check material compatibility and workability

49 Latex Modified Mortar or Concrete Section IV: Surface Preparation & Latex Placement

50 Section IV: Surface Preparation & Latex Placement Scarification Scarify bridge deck in ¼ increments ONLY No more than 7 days before overlay Remove gutter, dam and skewed areas with pneumatic hammers (<30#) Hydrodemolition can be used with prior approval from the District Structure Control Engineer. If called out on plans, pre-demo meeting should be held at project to go over specs and procedures.

51 Section IV: Surface Preparation & Latex Placement Type I, II and III Deck Repair Sound deck and lay out patches (square edges) Saw cut outline of patch (do not cut top mat of reinforcement) Remove deteriorated concrete with pneumatic hammers (<30#) Blow out patch areas with compressed air prior to new concrete placement Replace any damaged and/or missing reinforcement If using hydrodemolition and/or placing latex deck and patches monolithically, total latex depth can not exceed 4 (deck + patch). If the depth is greater, a AAAP mix must be used.

52 Section IV: Surface Preparation & Latex Placement Contact the Structure Control Engineer prior to milling and prior to deck placement. Additional depth beyond that which is specified on the plans, must be approved by the District Bridge Engineer, in writing, after a structural analysis is made to verify the structure will handle the additional loading. Additional thickness, once approved, should be paid for as material cost only and as approved by the District.

53 Section IV: Surface Preparation & Latex Placement Final Preparation If necessary, sandblast or shot blast deck to remove contamination Water blast deck Not More Than 24 hrs. prior to overlay placement Immediately following water blasting operation, cover deck with poly to prevent contamination

54 Section IV: Surface Preparation & Latex Placement Temperature Limitations: Ambient Air Temp = 45ºF to 84ºF Material Temp = 50ºF to 80ºF Evaporation Rate: not to exceed 0.10 psf/hr

55 Section IV: Surface Preparation & Latex Placement Testing of Latex Modified Concrete: QC Sampling: Test each 5 CY of latex for: Air Content, Temperature and Slump AT Sampling: Lot sizes consist of 20 CY or day s placement, whichever is less Lot accepted on 7-day compressive strength (3000 psi) ** no 28-day breaks req d.** **all cylinders field cured** Strip cylinders after 48 hours (wet cure time)

56 Section IV: Surface Preparation & Latex Placement Pre-Placement Details: Assure deck is thoroughly wet (no standing water) Clean any loose debris (should be done prior to cover)

57 Section IV: Surface Preparation & Latex Placement Placement Details: Two work bridges must be in place prior to start of placement (1-finishing, 1-burlap/plastic) Thoroughly scrub grout into deck be sure to cover all horizontal and vertical edges Scrub No More Than 6 to 8 ahead of finishing machine do not allow grout to dry Collect and discard excess aggregate

58 Section IV: Surface Preparation & Latex Placement

59 Section IV: Surface Preparation & Latex Placement Placement Details (continued): Use spud vibrator at all bulkheads and expansion dams (also deck repair areas if placed monolithic) Straightedge all gutter lines and bulkheads Texture surface as soon as possible without causing unwanted deformation

60 Section IV: Surface Preparation & Latex Placement

61 Section IV: Surface Preparation & Latex Placement Curing Details: Place a single layer of wet burlap as soon as surface will support it without deformation Within 1 hour of placing burlap, place single layer of white polyethylene film (4 mil min. thickness) Burlap must remain wet for at least 48 hrs. wet cure Use soaker hoses After wet cure period; remove plastic and burlap dry cure for 72 hrs. (or 96 hrs. if >2 depth) **see chart next page**

62 Section IV: Surface Preparation & Latex Placement Cure Times - Table A Depth of Application Wet Cure (Hours) Dry Cure (Hours) Live Load Application Total Cure Time (Hours) AND Live Load Compressive Strength (psi) 2 inches or less AND 3000 Greater than 2 inches AND 3000

63 Section IV: Surface Preparation & Latex Placement Final Check Gage Readings Cement Latex LatexSt Actual Latex Design Water Water Count CY Start - op Gallons Latex Start - Stop Gallons Max Des Min Ending Count = = 9.33 CY / = 9.33 CY

64 Final Check Section IV: Surface Preparation & Latex Placement FINAL CHECK FOR W/C RATIO PER TRUCK Date:06/15/2011 Load# 1 Truck# Water(1) Final Initial Gallons Water Wt = Gallons X 8.33 Latex(2) Final Initial Gallons % of Water in Latex Gallons of Water Water Wt % = Gallons X 8.33 Coarse Agg(3) Fine Agg(4) Total Water/ Truck(5) = Wt of C.A./ Cy No. of Cy MC % Water Wt % Wt of F.A./ Cy No. of Cy MC % Water Wt % Total Water Wt. of Cement(6) Final W/C Ratio per Truck(7) No. of Cy Wt of Cement/ Cy Cement Wt W/C Ratio 0.38

65 Latex Modified Mortar or Concrete Section V: Calibration Example

66 Section V: Calibration Example Using the information given to you work through the process of conducting the latex calibration. Watch out for curveballs!

67 CS-4220A (05-02) DISTRICT 8-0 SR SERIAL # RPM'S Section V: Calibration Example PLANT-CONCRETE MOBILE (TRUCK NO.) CONTRACTOR COUNTY SECTION TYPE STRUCTURE Latex Done Right Inc. Lancaster Bridge Deck DICHARGE TIME FOR 94 LBS. CEMENT BATCH-MIXER SLIP (CONCRETE MOBILE) DATE TIME CLASS OF CONCRETE DESIGN GALS. OF WATER/C.Y FINE AGG. OPENING COARSE AGG. OPENING CEMENT COUNT LATEX ZM4-410L ± 50 02/20/14 10:30 AM MIX PER 1042 AGGREGATE S.S.D. WT./YD. MOISTURE % (SURFACE) MOISTURE WT. FINE COARSE TOTAL X.12 = GALS TOTAL DESIGN H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED = GALS./ MIN. MAX. SPECS. H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED DESIGN YIELD = GALS./ MIN. ( DO NOT EXCEED ) 5 5 % DESIGN SLUMP DESIGN AIR TOTAL YARDS ( FROM CEMENT COUNT ) REMARKS: DESIGN WT.PER CU.YD. OF LATEX LBS. = GALLONS PERCENT WATER IN LATEX % GALS. WATER IN LATEX

68 Section V: Calibration Example CS-4342 (05-02) Truck Ident County Lancaster Mixer Ser. No. ZM4-410L FIELD CALIBRATION SHEET SR. & Sec RPM 1800 ± 50 FOR LATEX MOBILE MIXERS Contract No Date 2/20/14 RANGE % Target per PTM No. CEMENT Trials Totals Cement Weight (Net wt.) Meter Count (Whole No.) Seconds ( to 0.1 secs.) Total Meter Count Total Cement Wt. Factor (to 4 decimals) Wt. / Bag CEM ENT M ETER COUNT =.2287 X = 21.9 Total Seconds Total Cement Wt. Factor (to 4 decimals) Wt. / Bag TIME =.1847 X = 17.7

69 CS-4220A (05-02) DISTRICT 8-0 BATCH-MIXER SLIP (CONCRETE MOBILE) SERIAL # RPM'S Section V: Calibration Example PLANT-CONCRETE MOBILE (TRUCK NO.) CONTRACTOR COUNTY Latex Done Right Inc. Lancaster DATE TIME CLASS OF CONCRETE DESIGN GALS. OF WATER/C.Y. LATEX ZM4-410L ± 50 02/20/14 10:30 AM MIX 17.4 PER 1042 SR 0230 SECTION 015 TYPE STRUCTURE Bridge Deck DICHARGE TIME FOR 94 LBS. CEMENT FINE AGG. OPENING COARSE AGG. OPENING CEMENT COUNT AGGREGATE S.S.D. WT./YD. MOISTURE % (SURFACE) MOISTURE WT. FINE COARSE TOTAL 42.9 X.12 = 5.1 GALS TOTAL DESIGN H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED = GALS./ MIN. MAX. SPECS. H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED DESIGN YIELD = GALS./ MIN. ( DO NOT EXCEED ) 5 5 % DESIGN SLUMP DESIGN AIR TOTAL YARDS ( FROM CEMENT COUNT ) REMARKS: DESIGN WT.PER CU.YD. OF LATEX 207 LBS. = 24.5 GALLONS PERCENT WATER IN LATEX 52.0 % 12.7 GALS. WATER IN LATEX

70 CS-4342 (05-02) Cement Weight (Net wt.) Meter Count (Whole No.) Seconds ( to 0.1 secs.) Time (constant) Sand Dial Setting (3) FIELD CALIBRATION SHEET FOR LATEX MOBILE MIXERS County SR. & Sec. RPM Section V: Contract Calibration No Example CEMENT Trials Date 2/20/14 RANGE % Target per PTM No Lancaster 5 6 Totals Total Meter Count Total Cement Wt. Factor (to 4 decimals) Wt. / Bag CEM ENT M ETER COUNT =.2287 X = 21.9 Total Seconds Total Cement Wt. Factor (to 4 decimals) Wt. / Bag TIME =.1847 X = 17.7 SAND 2.2 % MOISTURE RANGE / - 2 % Total Design Weight (1) No. Bags of Cement Weight / Bag Sand Moisture Weight (2) Actual Sand Wt = = Actual Sand Wt. Time(from Cement calib) Weight / Bag Calibration Time(Sec) Calibration Wt = 13.6 x 8 = Calibration of sand dial Trial SAND DIAL SETTING Sand weight Truck Ident. Mixer Ser. No ZM4-410L ±

71 CS-4220A (05-02) DISTRICT 8-0 BATCH-MIXER SLIP (CONCRETE MOBILE) SERIAL # RPM'S Section V: Calibration Example PLANT-CONCRETE MOBILE (TRUCK NO.) CONTRACTOR COUNTY Latex Done Right Inc. Lancaster DATE TIME CLASS OF CONCRETE DESIGN GALS. OF WATER/C.Y. LATEX ZM4-410L ± 50 02/20/14 10:30 AM MIX 17.4 PER 1042 SR 0230 SECTION 015 TYPE STRUCTURE Bridge Deck DICHARGE TIME FOR 94 LBS. CEMENT FINE AGG. OPENING COARSE AGG. OPENING CEMENT COUNT AGGREGATE S.S.D. WT./YD. MOISTURE % (SURFACE) MOISTURE WT. FINE COARSE TOTAL 42.9 X.12 = 5.1 GALS TOTAL DESIGN H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED = GALS./ MIN. MAX. SPECS. H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED DESIGN YIELD = GALS./ MIN. ( DO NOT EXCEED ) 5 5 % DESIGN SLUMP DESIGN AIR TOTAL YARDS ( FROM CEMENT COUNT ) REMARKS: DESIGN WT.PER CU.YD. OF LATEX 207 LBS. = 24.5 GALLONS PERCENT WATER IN LATEX 52.0 % 12.7 GALS. WATER IN LATEX

72 Section V: Calibration Example SAND 2.2 % MOISTURE RANGE / - 2 % Total Design Weight (1) No. Bags of Cement Weight / Bag Sand Moisture Weight (2) Actual Sand Wt = = Actual Sand Wt. Time(from Cement calib) Weight / Bag Calibration Time(Sec) Calibration Wt = 13.6 x 8 = Calibration of sand dial Trial SAND DIAL SETTING Sand weight Time (constant) Sand Dial Setting (3) STONE 0.6 % MOISTURE RANGE / - 1 % Total Design Weight (1) No. Bags of Cement Weight / Bag Stone Moisture Weight (4) Actual Stone Wt = = Actual Stone Wt. Time(from Cement calib) Weight / Sec Calibration Time(Sec) Calibration Wt = 9.0 x 10 = 90.0 Calibration of stone dial Trial Stone weight Time (constant) Stone Dial Setting (3) STONE DIAL SETTING 6.2

73 CS-4220A (05-02) DISTRICT 8-0 BATCH-MIXER SLIP (CONCRETE MOBILE) SERIAL # RPM'S Section V: Calibration Example PLANT-CONCRETE MOBILE (TRUCK NO.) CONTRACTOR COUNTY Latex Done Right Inc. Lancaster DATE TIME CLASS OF CONCRETE DESIGN GALS. OF WATER/C.Y. LATEX ZM4-410L ± 50 02/20/14 10:30 AM MIX 17.4 PER 1042 SR 0230 SECTION 015 TYPE STRUCTURE Bridge Deck DICHARGE TIME FOR 94 LBS. CEMENT FINE AGG. OPENING COARSE AGG. OPENING CEMENT COUNT AGGREGATE S.S.D. WT./YD. MOISTURE % (SURFACE) MOISTURE WT. FINE COARSE TOTAL 42.9 X.12 = 5.1 GALS TOTAL DESIGN H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED = GALS./ MIN. MAX. SPECS. H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED DESIGN YIELD = GALS./ MIN. ( DO NOT EXCEED ) 5 5 % DESIGN SLUMP DESIGN AIR TOTAL YARDS ( FROM CEMENT COUNT ) REMARKS: DESIGN WT.PER CU.YD. OF LATEX 207 LBS. = 24.5 GALLONS PERCENT WATER IN LATEX 52.0 % 12.7 GALS. WATER IN LATEX

74 Section V: Calibration Example STONE 0.6 % MOISTURE RANGE Total Design Weight (1) No. Bags of Cement Weight / Bag Stone Moisture Weight (4) Actual Stone Wt = = Actual Stone Wt. Time(from Cement calib) Weight / Sec Calibration Time(Sec) Calibration Wt = 9.0 x 10 = 90.0 Calibration of stone dial Trial Stone weight Time (constant) Stone Dial Setting (3) LATEX RANGE / - 2 % Design Gal. / Bag Cement Time(from cement calib) G.P.M. 3.5 X = 11.9 Total Design Weight (1) No. Bags of Cement Weight / Bag Time (Cem. Calib.) Wt. / Sec. Calib. Tim e(sec.)(5) Calib. Wt = = 3.5 x 17.7 = 29.6 Calibration of Latex Gage Trial LATEX GAGE Gage Setting Fan Gage SETTING Time (constant) / - 1 % Gage Setting STONE DIAL SETTING

75 Section V: Calibration Example LATEX RANGE / - 2 % Design Gal. / Bag Cement Time(from cement calib) G.P.M. 3.5 X = 11.9 Gage Setting Total Design Weight (1) No. Bags of Cement Weight / Bag Time (Cem. Calib.) Wt. / Sec. Calib. Tim e(sec.)(5) Calib. Wt = = 3.5 x 17.7 = 29.6 Calibration of Latex Gage Trial LATEX GAGE Gage Setting Fan Gage SETTING Time (constant) WATER RANGE / - 1 % Calib. Of Gage or Flow meter Trial Gage Setting Gal./Min. (7) Time (Minutes) Theo.Wt.(Setting X 8.33 X Tim Actual Water Wt. (6) WATER GAGE SETTING (gpm) Max Min Des 14.0

76 Section V: Calibration Example Water/Cement ratio X Wt. Bag Cement X No. Bags Cement 8.33 = Total Gallons of Water MAX DES MIN 0.40 x 94 x x 94 x x 94 x 7 = 31.6 = 30.0 = MAX DES MIN Total Gallons of Water = Gals latex X % water in latex Gals total aggregate moisture Gals. Water to be added per yd Gals. Water to be added X 60 No. Bags Cem. X Calib. Time for Bag Cement = Water Gage Setting MAX DES MIN x 60 = x 60 = x 60 = 7 x = 7 x = 7 x = gpm = 6.7 gpm = 5.9 gpm = 2.9

77 CS-4220A (05-02) DISTRICT 8-0 BATCH-MIXER SLIP (CONCRETE MOBILE) SERIAL # RPM'S Section V: Calibration Example PLANT-CONCRETE MOBILE (TRUCK NO.) CONTRACTOR COUNTY Latex Done Right Inc. Lancaster DATE TIME CLASS OF CONCRETE DESIGN GALS. OF WATER/C.Y. LATEX ZM4-410L ± 50 02/20/14 10:30 AM MIX 17.4 PER 1042 SR 0230 SECTION 015 TYPE STRUCTURE Bridge Deck DICHARGE TIME FOR 94 LBS. CEMENT FINE AGG. OPENING COARSE AGG. OPENING CEMENT COUNT AGGREGATE S.S.D. WT./YD. MOISTURE % (SURFACE) MOISTURE WT. FINE COARSE TOTAL 42.9 X.12 = 5.1 GALS TOTAL DESIGN H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED 18.9 = GALS./ MIN. MAX. SPECS. H20 GALS - TOTAL MOISTURE GALS = GALS. TO BE ADDED DESIGN YIELD = GALS./ MIN. 6.7 ( DO NOT EXCEED ) 5 5 % DESIGN SLUMP DESIGN AIR TOTAL YARDS ( FROM CEMENT COUNT ) REMARKS: DESIGN WT.PER CU.YD. OF LATEX 207 LBS. = 24.5 GALLONS PERCENT WATER IN LATEX 52.0 % 12.7 GALS. WATER IN LATEX

78 Section V: Calibration Example Actual Latex Gallons Gage Readings Cement Latex LatexSt Design Water Count CY Start - op Latex Start Water Stop Gallons Max Des Min Ending Count = = CY?

79 Section V: Calibration Example FINAL CHECK FOR W/C RATIO PER TRUCK Date: Load# 1 Truck# Water(1) Final Initial Gallons Water Wt % of Gallons Latex(2) Final Initial Gallons Water in Water Wt of Water Latex % Coarse Agg(3) Fine Agg(4) Total Water/ Truck(5) = Wt. of Cement(6) Final W/C Ratio per Truck(7) Wt of C.A./ Cy No. of Cy MC % Water Wt % Wt of F.A./ Cy Total Water No. of Cy W/C Ratio No. of Cy MC % Water Wt % Wt of Cement/ Cy Cement Wt

80 PennDOT Engineering District 8-0 Questions?