Exam 1(Fall 2012).doc - CALIFORNIA STATE UNIVERSITY LONG BEACH Department of Civil Engineering and Construction Engineering management CEM 200 First

Exam 1(Fall 2012).doc - CALIFORNIA STATE UNIVERSITY LONG...

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CALIFORNIA STATE UNIVERSITY, LONG BEACH Department of Civil Engineering and Construction Engineering management CEM 200 First Midterm Exam PART I: TRUE & FALSE 1. Paste is a mixture of cement and water. 2. Mortar is a mixture of cement, water, coarse aggregate and fine aggregate. 3. Strength and durability of concrete are inversely proportional to its W/C ratio (i.e. as you increase the W/C ratio, strength and durability decrease). 4. The hydration process works only for 3 days, after which it stops. 5. Slump is increased by increasing the temperature. 6. Harsh concrete may cause segregation. 7. Iron Oxide is the largest component of raw materials that are used in the cement manufacturing process. 8. Large cross-sectional concrete elements with low reinforcement content may require higher slump concrete compared to small cross-sectional elements with higher reinforcement content. 9. Plain concrete has a very high resistance to tension. 10.Slump Test measures the cohesiveness of concrete. 11. Concrete used in standard applications may be characterized by an average slump of 8 to10 inches. 12.Shape of coarse aggregate pieces may impact the harshness of concrete 13. Low cement content leads to high stickiness of concrete. 14. Columns in high-rise buildings and driveways are two examples in which high compressive strength concrete (greater than 10,000 psi) must be used. 15. the use of well graded aggregate helps to reduce bleeding of concrete. 1
PART II 1.What is the purpose of the paste in concrete mixes.2.List two factors that impact the hydration process.3.Define segregation and list two problems that it may cause.4.Define bleeding and list two problems that it may cause.5.List one use for Type III and another use for type IV cement. GOOD LUCK 2

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