Shanmugha Arts Science Technology and Research Academy (SASTRA) University 2010 B.E Civil Engineering University B.Tech Third Mid Semester BCECCE 305 CONCRETE TECHNOLOGY - Question Paper

Duration:90min Max. Marks:50
Charts, tables for ACI method is permitted

ans all the ques.
Part A 10*2=20marks

1.What is the minimum w/c ratio needed to fulfill the requirement of hydration and filling of voids?

2.What are the stages of transformation of fresh concrete to hardened concrete?

3.What is mix proportioning?

4.Write Fuller's empirical expression for arriving at the proportion of various grain sizes.

5.What is the importance of mixing time?

6.When will ready mix concrete to preferred?

7.What are the loads to be considered for the design of form work?

8.How is the temperature rise controlled in mass concrete?

9.What is SCC?

10.Define shotcreting.

Part B 2*15=30marks

11.a) discuss different physical and chemical properties of OPC. (07marks)

b) discuss various kinds of cement. (08marks)

(or)

12.It is needed to design a concrete mix as per ACI method for an airfield pavement. The pavement is to be designed for a minimum compressive strength of 25N/mm2 at 28 days. The laboratory tests on the controlling mix show a standard deviation of 4N/mm2. The specific gravity of CA is 2.68, its dry rodded density is 1600Kg/m3, and its maximum size is 40mm. The specific gravity of FA is 2.64 and fineness modulus is 2.80. A slump of 25mm is specified. OPC will be used. presume any data suitably. (15marks)

13. Briefly discuss various methods of curing. (15marks)

(or)

14. Briefly discuss the effects of hot and cold weather on concrete? (15marks)

Earning:   Approval pending.