Update on the current APT Project in Texas

First APT Project TxDOT – RAP & RAS content in recycled mixes

TxDOT project 0-6682 Validation of the Maximum Allowable Amounts of Recycled Binder, RAP & RAS Using APT 5/01/2012 to 4/31/2014 0-6823 Testing of RAP & RAS Experimental Pavement Sections 8/01/2014 to 8/31/2015 Objectives Validate the performance of mixes containing the maximum allowed percentage of RAP and/or RAS from Special Provisions 341—024 and 340—003.

N Layout of the Experimental Sections Section C Section F Section B TRAILER 10ft Saw cuts Section C Section F Reflection Cracking 4 x 8 = 32ft Section B Section E Rutting Section A Section L Fatigue Cracking Section D Section G Section H Section J 10ft Instrumentation Boxes Section I Section K 75ft 75ft NOTE: Not Drawn to scale

BMD = Balanced Mix Design HMA Mixes Test Section Reflection Cracking Fatigue Cracking Surface 2.0 in. Intermediate Base 8.0 in. 2 in. 8.0 inch Subbase A Type D Type C Cement (3.5%) Treated Base L Bridgeport Rock Cement (2.0%) Treated B High RAP E C RAP&RAS F D BMD G Rutting Experiment Type D – contains no RAP High RAP = (19% RAP) RAP&RAS = (15%RAP + 3%RAS) BMD = Balanced Mix Design Type B and C mixes may or may not contain RAP These mixes and designs are subject to modification based on PMC review 6.0 in. 7.0 in. H Type B I J K

Permanent Deformation – Section G

Permanent Deformation – Section L

Cracking – Section G Date: 4/23/2014 Passes: 320K 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 CL CL -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 Number of squares with cracks =37 % Cracked Area =31%

Cracking – Section G Date: 5/2/2014 Passes: 416K 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 CL CL -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 Number of squares with cracks =60 % Cracked Area = 51%

Cracking – Section G Date: 5/2/2014 Passes: 416K

Cracking – Section L Date: 4/23/2014 Passes: 320K -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 CL CL 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Number of squares with cracks = 0 % Cracked Area = 0%

Cracking – Section L Date: 5/2/2014 Passes: 416K -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 CL CL 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Number of squares with cracks =26 % Cracked Area = 22%

Permanent Deformation – Section J

Permanent Deformation – Section K

N Layout of the Experimental Sections Section C Section F Section B TRAILER 10ft Saw cuts Section C Section F Reflection Cracking 4 x 8 = 32ft Section B Section E Rutting Section A Section L Fatigue Cracking Section D Section G Section H Section J 10ft Instrumentation Boxes Section I Section K 75ft 75ft NOTE: Not Drawn to scale