The most common admixture which is used to accelerate the initial set of concrete is______________?

Related Mcqs:

1. The slump recommended for mass concrete is about_______________?

   A. 25 mm to 50 mm
   B. 50 mm to 100 mm
   C. 100 mm to 125 mm
   D. 125 mm to 150 mm

2. Which of the following cements is suitable for use in massive concrete structures such as large dams ?

   A. ordinary Portland cement
   B. low heat cement
   C. rapid hardening cement
   D. sulphate resisting cement

3. The basic purpose of a retarder in concrete is_____________?

   A. to increase the initial setting time of cement paste in concrete
   B. to decrease the initial setting time of cement paste in concrete
   C. to render the concrete more water tight
   D. to improve the workability of concrete mix

4. Proper amount of entrained air in concrete results in__________?

   1. better workability
   2. better resistance to freezing and thawing
   3. lesser workability
   4. less resistance to freezing and thawing The correct answer is:

    

   A. (1) and (2)
   B. (1)and(4)
   C. ((2)and (3)
   D. (3)and (4)

5. The initial setting time for ordinary Portland cement as per IS specifications should not be less than_____________?

   A. 10 minutes
   B. 30 minutes
   C. 60 minutes
   D. 600 minutes

6. The main constituent of cement which is responsible for initial setting of cement is_________________?

   A. dicalcium silicate
   B. tricalcium silicate
   C. tricalcium aluminate
   D. all of the above

7. Study the following statements. (1) Hydraulic lime is suitable for white washing, (2) Fat lime is suitable for whitewashing, (3) Hydraulic lime is suitable for making mortar, (4) Fat lime is suitable for making mortar. The correct answer is______________?

   A. (1) and (4)
   B. (2) and (3)
   C. (1) and (2)
   D. (3) and (4)

8. The main constituent which imparts hydraulicity to hydraulic lime is______________?

   A. calcium oxide
   B. silica
   C. clay
   D. water

9. The type of roof suitable in plains where rainfall is meagre and temperature is high is______________?

   A. pitched and sloping roof
   B. flat roof
   C. shell roof
   D. none of the above

10. The function of cleats in a roof truss is______________?

    A. to support the common rafter
    B. to support purlins
    C. to prevent the purlins from tilting
    D. all of the above