1. Multiple Choices. (2\'x10-20 pts) 1) In a mortar, the binding material is A.c

Question

1. Multiple Choices. (2'x10-20 pts) 1) In a mortar, the binding material is A.cement C.water B sand D.gravel 2) For ensuring quality of concrete, use A.single sized aggegates B, two sized aggregate C graded aggregates D coarse aggregates. Separation of coarse aggregates from mortar during transportation, is known 3) A. bleeding Csegregation B.creeping D.shrinkage 4) You are asked to construct a massive dam, the type of cement you will use, is A.ordinary Portland cement B.rapid hardening cement C,low heat cement D.blast furnace slag cement 5) Workability of concrete for a given water content is good if the aggregates, are A.rounded aggregate B.irregular aggregate C.angular aggregate D.flaky aggregates. 6) Age of a tree may be ascertained by A.radius of its stem B.circumference of its stemm C.number of branches D.number of annual rings.

Explanation / Answer

1. Option A

In mortar binding material is cement

Cement binds the soil particles with help of water

2. Option c

For ensuring better quality of aggregates it is better to use well graded aggregates

3.option c is the correct answer

The phenomenon of separating coarse particle from mortar or concrete is known

As segregation

4.option c is the correct answer

Because low heat cement produces low heat of hydration during construction of dam

5.option A

Workability of concrete is good for rounded aggregates

Because of rounded aggregates posses less surface and less void area so that excess paste will give more lubricating effect

6. option d is the correct answer

Number of annual rings are used to ascertain age of tree

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