Job-mix FormulaName of Project: Asphalt Overlay project along JP Rizal Makati City,km 292.7 to 592.5

I. Sources of MaterialsA. Coarse aggregate- Montalban RizalB. Fine aggregate- Porac,PampanggaC. Mineral filler-Apo-portland cementD. Asphalt Cement-60/70-Shell Phils.

II. Blending Proportion of Aggregates.% max. size of aggregate (CA)=633/8 max. size of aggregate (FA)=31Mineral Filler (MF)=06

III.Grading of composite aggregates

AggregatesSieve size(Inch)Grading C Specifications % PassingDesign Grading % PassingMass retained(grams)CA1100100-95-100973668-86772403/856-7867120#438-6049216#827-4737144

FA#1618-3728108#3013-282184#509-201572#2004-86108MFP-cement72

IV.Specific Gravity of MaterialsSpecific Gravity of Aggregates(Combined)=2.72Specific Gravity of Asphalt=1.01

V. Temperature ControlsTemperature of aggregates 165 CTemperature of Asphalt 110 CTemperature of Mix 130 CCompaction temperature 120 C

VI. Asphalt Content% AC by weight of mix or Optimum Asphalt Content (OAC)@ Max. stability 6.0@ Max. unit wt. 6.0@ Ideal Air voids(4.0)- 5.7% Optimum Asphalt Content (OAC)=6.0+6.0+5.7 3Say 5.9%

VII.Test on Properties of Mix based on AOC using the graph(Graphical method)Bulk, specific gravity= 2.499Marshall stability,kg=1,275Flow value,0.25mm=9.0Air voids,%=3.45Voids Filled with asphalt(VFA),%=75Voids in mineral aggregates(VMA),%=13.55

VIII.Analysis of Test Result

TestsTest resultSpecifications (Heavy Traffic)RemarksStability,lbs2,8051800 mincompliedUnit wt2.499--Voids,%3.453-5compliedFlow,0.25mm9.08-14compliedVFA,%75.0065-75compliedVMA,%13.5513 mincomplied

A. Bulk Specific gravity of compacted mixture,GmbFormula: Gmb= wt. of sample in air Wt. of sample in SSD condition- wt. of sample in waterGmb@ 5 % AC= 1266 = 2.47 1267-754Gmb@ 5.5 % AC= 1257 = 2.49 1262-758Gmb@ 6 % AC= 1295 = 2.50 1297-779Gmb@ 6.5 % AC= 1264 = 2.49 1265-758Gmb@ 6.5 % AC= 1264 = 2.49 1265-758Gmb@ 7 % AC= 1252 = 2.45 1262-750

B. Air voids in compacted mixture,VaFormula: Va=Gmm-Gmb x 100 GmmVa@ 5.0%AC = 2.62-2.47 x 100 = 6.0 2.62Va@ 5.5%AC = 2.61-2.49 x 100 = 4.6 2.61Va@ 6.0%AC = 2.58-2.50 x 100 = 3.1 2.58Va@ 6.5%AC = 2.54-2.49 x 100 = 2.0 2.54Va@ 7.0%AC = 2.47-2.45 x 100 = 1.0 2.47

C. Voids in Mineral Aggregate,VMAFormula: VMA=100- Gmb Ps GsbVMA @ 5.0% AC=100 2.47(95) = 13.73 2.72VMA @ 5.5% AC=100-2.49(94.5) = 13.49 2.72VMA @ 6.0% AC=100-2.50(94) = 13.60 2.72VMA @ 6.5% AC=100-2.49(93.5) = 14.41 2.72VMA @ 7.0% AC=100-2.45(93) = 16.23 2.72

D. Voids Filled with Asphalt,VFAFormula: VFA=100x VMA-Va VMA VFA @ 5.0% AC=100 x(13.73-6) = 56.30 13.73VFA @ 5.5% AC=100 x(13.49-4.6) = 65.90 13.49VFA @ 6.0% AC=100 x(13.60-3.1) = 77.20 13.60VFA @ 6.5% AC=100 x(14.41-2.0) = 86.12 14.41VFA @ 7.0% AC=100 x(16.23-1.0) = 93.84 16.23

E. For Optimum Asphalt Content,OACAsphalt content at maximum stability--=6.0%Asphalt Content at max. bulk sp.gr.---6.0%Asphalt content@ 4% voids in the total mix---5.7%_______________________________________ Optimum Asphalt Content, OAC = 5.9%

F. Jobmix formula,from the graph:Optimum Asphalt Content,%-----=5.90Max. stability,kg------------------=1275Max. sp. Gr.(bulk)---------=2.49999Air voids,%-----------------=3.45Flow(0.25mm),%----------=9.0VMA,%----------------------=13.55VFA,%-----------------------=75

G. Max. Specific gravity of mixtures,GmmFormula No.1 (Theoretical Method)Gmm= Pmm Ps+ Pb Gsb Gb

Where:Pmm - percent by weight of total loose mixture=100Ps- aggregate content, percent by total weight of mixtureGsb- sp. Gr. Of aggregatePb- asphalt content,percent by total wt. of mixtureGb- sp.gr. Of asphalt

Formula no.2 (Actual)Gmm= A - B (A-B) + C-DWhere:A- wt. of pot without lid + sampleB- wt. of pot without lidC- wt. of pot with lid filled with waterD- wt. of pot with lid + water + sample