7. Determine the SG and moisture content (M.C.) of an aggregate blend consisting of 30% of "A" aggregate and 70% of "B"

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7 Determine The Sg And Moisture Content M C Of An Aggregate Blend Consisting Of 30 Of A Aggregate And 70 Of B 1 (204 KiB) Viewed 37 times

7. Determine the SG and moisture content (M.C.) of an aggregate blend consisting of 30% of "A" aggregate and 70% of "B" aggregate, while the SG of A and B is 2.68 and 2.75; respectively, and the moisture contents of A and B are 1.5% and 0.5%. (5+5 points) 3. Find the thermal expansion stain for 100-feet concrete bridge girder suffering an increase of temperature increase of 45 Celsius degrees, assuming concrete thermal expansion coefficient: 106/C. If the strain is totally confined, how much the thermal stress will be resulted assuming the modulus of elasticity of concrete E= 3×106 (psi) (5+5 points) 8. A contractor is planning to design asphalt mixture for a highway. There are four aggregate sources available for the mix and the sieve analysis for each aggregate source was completed as shown in Table below. Based on the individual sieve results: 1. Complete the gradation table below (i.e., the composite blend column) for the predetermined ratio of these aggregates to see if all sieves of target are met with the target? (5 points) Aggregate Source RAP Coarse Aggregate. Intermediate Aggregates Fines Blend/Composite Percent Used 15 23 25 37 =100 (Proportion) (%) Sieve Size Target Individual Gradation (% Passing) Combined (%) (mm) (%) 25 100 100 100 100 100 19 100 68 100 100 90-100 9.5 88 4 50 100 56-80 4.75 71 2 83 35-65 2.36 58 2 2 59 23-49 0.3 26 1 1 23 5-19 0.075 7 1 1.2 10.9 2-8 2. If the % of RAP is increased up 25%, then, which one of the other three aggregates will you decrease? and find its % accordingly (5 points) Aggregate Source RAP Coarse Intermediate Aggregate. Aggregates Fines Blend/Composite Percent Used 25 23 25 37 -100 (Proportion) (fixed) (%) Sieve Size Individual Gradation (% Passing) Combined (%) (mm) 25 100 100 19 100 68 9.5 88 4 4.75 71 2 2.36 58 2 26 1 0.3 0.075 7 1 8884212 100 100 50 100 100 100 83 59 23 10.9 ON Target (%) 100 90-100 56-80 35-65 23-49 5-19 2-8