hw2 - SuperPave specifications. Results of laboratory...

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Dr. Marwa Hassan marwa@lsu.edu CM3400: Assignment No. 2 Due Date: Monday 03/23/09 1. If water from an untested source is to be used for concrete manufacturing, what is the requirement for strength? What are the impurities that we need to control to avoid detrimental effects? 2. List the basic types of Portland cement, and describe their characteristics and uses. 3. What modification is made to concrete to increase its resistance to freeze-thaw damage? 4. Explain the benefits and drawbacks (if any) of using retarders, accelerators, silica fume, and super-plasticizers. 5. What are the four basic chemical compounds which make up Portland cement, and what effect do they have on Portland cement concrete? 6. Describe the following distresses and their main causes: segregation, sulfate attack, alkali-silica reaction, and carbonation. 7. A 9.5mm nominal maximum aggregate size mix that was placed on a high priority route failed prematurely. Cores were extracted to see if the mix conformed to the
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Unformatted text preview: SuperPave specifications. Results of laboratory testing were as follows: a. Gmb=2.433, Pa=3%, and Gsb=2.712 b. Gmm=2.536 If the traffic volume expected on this road was 2 million ESALs, determine whether this mix conformed to the SuperPave VMA, VFA, and Air Voids requirements. 8. Concrete is required for an interior slab on grade in Louisiana. The 28-day compressive strength should be 4,000 lb/in 2 . The slump should be between 3 and 4 in. and the maximum aggregate size should not exceed 1 in. The properties of the materials are as follows: a. Cement : Type II, specific gravity = 3.15 b. Coarse Aggregate: Bulk specific gravity (SSD) = 2.68; absorption capacity = 0.5%; dry-rodded unit weight = 95 lb/ft3; surface moisture = 1% c. Fine Aggregate: Bulk specific gravity (SSD) = 2.59; absorption capacity = 1.0%; fineness modulus = 2.80; surface moisture = 2.1%. What is the mix design?...
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