Why specify Surface Aggregate Classification A (SAC-A)?
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1 Why specify Surface Aggregate Classification A (SAC-A)? TxDOT s Wet Surface Crash Reduction Program (WSCRP) Reduce wet surface crashes & fatalities FHWA mandate issued June 27, 1967 Highway Safety Program Standard 12 Three components of the program 1. Wet surface crash data analysis Traffic Operations Division 2. Aggregate selection guidelines Construction Division 3. Network level skid testing Maintenance Division
2 TxDOT/WSCRP - Aggregate Selection Guidelines (CST/M&P) Frictional Demand of Roadway Surface Surface Aggregate Classification (SAC)
3 Where are SAC-A sources available in Texas? Amarillo Oklahoma Arkansas New Mexico (2) Childress Lubbock Wichita Falls Paris (4) Abilene Fort Worth Dallas Tyler Atlanta Odessa Brownwood Waco Lufkin El Paso San Angelo Austin (2) Bryan Houston Beaumont (11) San Antonio Yoakum Mexico Laredo Corpus Christi - SAC A SAC A 42 Sources (45%) - SAC B SAC B 52 Sources (55%) Pharr (5)
4 When will TxDOT Implement a SAC B+ Rating Classification? Amarillo Oklahoma Arkansas New Mexico Childress (2) Lubbock Wichita Falls Paris (4) Atlanta Abilene Fort Worth Dallas Tyler El Paso Odessa San Angelo Brownwood Waco Bryan Lufkin Austin (2) Houston Beaumont San Antonio (11) Yoakum SAC A 41 Sources (45%) Laredo Corpus Christi - SAC A SAC B 43 Sources (45%) - SAC B Dolomite 10 Sources * (10%) * 1 SAC A and 9 SAC B Mexico Pharr (5) - Dolomite
5 When will TxDOT use general notes to allow blending of all SAC B aggregates? SAC B Quarries (No Dolomites) Soundness Rated Values # of Quarries 10 or Less 10 >10 to > or Less - <10 to 20 - > 20
6 TxDOT SAC A Estimated Letting Quantities Year Total Seal Coat* HMA** ,987 58, , , , , ,579, ,278 1,260, (Jan Sept) 1,095,553 96, ,906 * - Seal coat aggregate conversion factor of 1.20 Tons per CY. No quantities included from item description codes for Tiers I, II, or III aggregate from seal coat material selection table; SAC not specified. ** - Includes assumptions for percentage of mix and bin percentages for each mix type.
7 TxDOT Aggregate Research and Testing Long term (3-5 years) research efforts to quantify microtexture and to predict friction AIMS DFT Aggregate Image Measurement System (AIMS) Measures aggregate characteristics for texture, angularity, and shape (round or flat) Image based analysis, investigating use of optical sensors for a laser based system for texture only Dynamic Friction Tester (DFT) Measures Coefficient of Friction on wet surface Platform speed starts at 50 mph (80 km/h) and measures friction continuously to 6 mph (10 km/h) Maryland DOT has specifications for aggregate blending
8 Load, lbs Maximum Load, lbs OT Data Analysis Area used for Fracture Energy Maximum Load First Crack Retardation Rate Power equation representing load reduction curve y = ax b, a=1-400 G f = W A Displacement, in Number of Cycles The fracture energy and crack retardation rate are plotted together on a design interaction plot
9 TOUGHNESS Critical Fracture Energy, lbs-in./in.2 Overall View of All Mixtures Crack Progression Rate FLEXIBILITY CAM TOM-F TOM-C SMA-C SMA-D SMA-F SMAR-C SMAR-F SP-C SP-D SP-B Type D Type C Type B 9
10 DTc using BBR log (Stiffness or S) m-value (ability to relax) m = 0.3 S = 300MPa Temperature Temperature S based continuous grade Differen ce = DTc m-value based continuous grade Binders with DTc > 6 o C
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