Exam 2(Spring 2018).doc - CALIFORNIA STATE UNIVERSITY LONG BEACH Department of Civil Engineering and Construction Engineering management CEM 200 Second

Exam 2(Spring 2018).doc - CALIFORNIA STATE UNIVERSITY LONG...

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CALIFORNIA STATE UNIVERSITY, LONG BEACH Department of Civil Engineering and Construction Engineering management CEM 200 Second Midterm Exam Normal weight concrete is to be placed in a structure consisting of slabs, walls and columns. The smallest structural elements are 10 in. walls with 1 in. reinforcing bars spaced at 6 in, 3 in. clear of forms. The structure is not in severe exposure, and air entrainment is not specified . The contractor proposed to use 1.5. in. MSA. Required compressive strength: 6000 PSI Max. W/C = 0.45 Slump: max. 4 in. Specific gravity of cement : 3.15 Properties of CA: bulk specific gravity, SSD: 2.70 SSD moisture content: 2% Air dry moisture content: 1.5% Dry rodded unit weight: 100 pcf Properties of FA: bulk SSD specific gravity: 2.60 SSD moisture content: 2.5% Air dry moisture content: 4.0 % fineness modulus: 2.80 GOOD LUCK 1
CALIFORNIA STATE UNIVERSITY, LONG BEACH Department of Civil Engineering and Construction Engineering management CEM 200 Second Midterm Exam PART I SOLVE 4 QUESTIONS ONLY 1. Sieve analysis test is performed to measure the unite weight of aggregate particles. (True-------- False----------) 2. Flat and elongated aggregate pieces improve the workability of concrete. (True-------- False----------) 3. Rough aggregate texture is more desirable than smooth one, as it improves the bond with the paste. (True-------- False----------) 4. The absorption of aggregate should not exceed 2%.(True------ False-------) 5. Small size aggregate requires more water than larger sizes. (True------ False-----) GOOD LUCK 2
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PART II: (CLOSED BOOK) SOLVE 7 QUESTIONS ONLY 1- The purpose of using water in the concrete mix is to improve the workability ONLY . (True-------- False----------) 2- Water contains 2500 PPM of impurities can be used in the concrete mix.

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