University of Missouri – Kansas City Dr. J. T. Kevern CE378 Civil Engineering Materials Spring 2024 Lab 5 - SuperPave Asphalt Testing *This information will be pooled between all lab groups and sections and used for HW#6 Lab Activity 1 – Standard Test Method for Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures - ASTM D2041 Procedure: 1. By hand break apart your loose asphalt mixture so the particles are not larger than about 6mm. You need at least 2500g of loose mixture. 2. Determine the mass of the vacuum pycnometer and cover filled with water. 3. Pour half of the water off and place all of your sample in the pycnometer. Make sure it is under water, filling as needed. 4. Place on the vibrating vacuum table for 10 minutes. 5. With the sample in the water determine the mass of the pycnometer, cover, sample, and water. 6. Calculate Gmm and record. A mm= A+D-E Where: Gmm=maximum specific gravity of the mixture A = mass of dry sample in air, g D = mass of lid and bowl with water, g E = mass of lid, bowl, sample, and water Binder A, mass of Content (%) sample in air, g D, mass of lid and bowl with water, g E, mass of lid, bowl, sample, and water, g Gmm 4.0% 2086.4 7396.9 8683.0 5.0% 2383.1 7400.4 8830.9 5.5 % 2252.1 7400.9 8746.3 1 University of Missouri – Kansas City - Dr. J. T. Kevern Lab Activity 2 Standard Test Method for Bulk Specific Gravity and Density of Non-Absorptive Compacted Asphalt Mixtures - ASTM D2726 1. Determine the mass of your dry/unconditioned “A” specimen in the air. Remove the top and bottom paper beforehand. 2. Determine the mass of the compacted sample underwater. 3. With a damp towel, bring to SSD condition and determine the mass. 4. Calculate Gmb and record. G mb=BC A Where: Gmb bulk specific gravity of the sample A = mass of dry sample in air, g B = mass of the saturated surface-dry specimen in air, g C = mass of the specimen in water, g Binder A, mass Content (%) of B, mass of the C, mass of the saturated surface- specimen in water, g dry specimen in air, sample in air, g 4.0% 3727.9 3737.2 2183.8 5.0% 3701.2 3707.1 2178.3 5.5% 3697.3 3701.1 2185.5 Gmb 2 University of Missouri – Kansas City Lab Activity 3 - Tensile Strength Ratio – AASHTO T283 Procedure: Dr. J. T. Kevern 1. Vacuum saturate one puck (B sample) of each binder content at 25°C for 24 hours. 2. Test the splitting tensile strength of the conditioned and dry specimens. 3. Calculate the splitting tensile strength. St Where: St = tensile strength, psi P = Maximum load, lbsf T = specimen height before testing, in D = specimen diameter, in = (2*P) (П*T*D) 4. Calculate the tensile strength ratio. TSR = Strength conditioned Strength dry * 100 > 80% Binder Specimen Condition Specimen Maximum Tensile Content height Load (lbf) Strength Tensile Strength Ratio (%) (mm) (psi) (%) 4.0% A Dry 89.9 2650 4.0% B Saturated 90.4 2360 5.0% A Dry 88.9 1920 5.0% B Saturated 88.2 1660 5.5 % A Dry 87.3 1560 5.5% B Saturated 87.3 1310 3/n CE378 Civil Engineering Materials HW #6 Asphalt Mixture Proportions 30 pts Spring 2024 Due 3/7/24 1. (5) Calculate the Gmm, Gmb, voids, individual tensile strength, and TSR for the provided data. 2. (15) Plot binder content versus voids and determine the optimal binder content. Plot TSR versus voids and determine if the optimal binder content has acceptable moisture performance. 3. (10) Develop optimized mixture proportions, including volumetrics, for the selected binder content. Assume 50% CA1, 10% CA2, and 40% FA, by mass of aggregate. Both coarse aggregates have specific gravity of 2.65 and absorption of 1%. The fine aggregate has a specific gravity of 2.62 and absorption of 0.8%. The specific gravity of our binder is 1.017.