Construction Management Construction Materials Testing Problem#1 The shape and surface texture of aggregate particles are important for Portland cement concrete. What would you prefer round and smooth aggregate or rough and angular aggregate? Briey explain why. Problem#2 Measure Wet Wei_ht lb Determine in percentage: (a) Total moisture content MC of each sample (b) Free moisture content FMC for each sample (c) Average total moisture AMC of the three samples (d) Average free moisture content AFMC of the three samples. Notes: Wet Weight Dry Weight MC (%) = Wx 100 FMC (%) 2 MC (%) Absorption (%) Problem #3 A sample of wet aggregate weighed 0.135 lb. After drying in an oven, this sample weighed 0.128 lb. The absorption of this aggregate is 2.5%. Calculate the weight of free water in the original sample. Notes: Free water (%) = FMC (%) * Dry Weight. Problem #4 102.3 lb of ne aggregate is mixed with 159.1 lb of coarse aggregate. The fine aggregate has a moisture content of 2.0% and absorption of 3.4%, whereas the coarse aggregate has a moisture content of 1.3% and absorption of 3.8%. What is the amount of water required to increase the moisture contents of both ne and coarse aggregates to reach absorption? Problem #5 Calculate the sieve analysis shown in the table below. What is the maximum size? What is the nominal size? Cumulative Cumulative Percent Pas sing Amount Retained, Percent Retained (1b) Plot the percent passing versus sieve size on (see charts below): 1. A semilog gradation chart Percent passing Problem #6 70 80 8 100 0.075 No. 200 C535, ASTM C227, ASTM C289, and ASTM C586 0.150 No. 100 Write short summary on the following ASTM specifications: 0.300 No. 50 0.600 No. 30 ASTM D692, ASTM D1073, ASTM D6913, ASTM C136, ASTM C88, ASTM C131, ASTM Figure 1. Semi-Log Aggregate Gradation Chart 1.180 No. 16 Sieve size Sieve size, mm 2.36 No. 8 4.75 No. 4 3/8 in. 12.5 1/2 in. 19.0 3/4 in. 25.0 1 in. 37.5 1 1/2 in. 50.0