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Question:

Published on: 30 June, 2022

Introduce Flow table test. How can sulphate attack be controlled?

Answer:

Flow Table Test:-

This is a laboratory test, which gives an indication of the quality of concrete with respect to consistency, cohesiveness and the proneness to segregation. In this test, a standard mass of concrete is subjecting to jolting. The spread or the flow of the concrete is measured and this flow is related to workability.

Sulphate attack can be controlled by:

use of sulphate resisting cement.
quality concrete.
use of air entrainment.
use of pozzolana.
high pressure steam curing.

Subjects

Concrete Technology Design of Reinforced Concrete Structures Irrigation Engineering Surveying

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Short notes on :

SLUMP TEST
COMPACTING FACTOR TEST
CRUSHING TEST
IMPACT TEST

30 June, 2022

How standard consistency test is done on cement? Explain the procedure briefly.

30 June, 2022

What is an air entraining agents? Give some examples. What is efflorescence in concrete structure?

30 June, 2022

The Oxide composition of O.P.C. is as follows :

CaO (50%), SiO₂ (15%), Al₂O₃ (5%), Fe₂O₃ (3%), SO₃ (2%)

Find the percentage of C₃S and C₃A.

29 June, 2022

Design concrete mixes of M30 to suit the following data per IS:10262-1982 :

Characteristic cube strength = M-30, type of cement - ordinary Portland, fine aggregate natural river sand conforming to grading zone II of table-4 of IS:383-1970 coarse aggregate-crushed (angular) coarse aggregate of 20 mm maximum size conforming to IS:383 code requirements, specific gravities of cement, sand and coarse aggregate are 3·14, 2·63 and 2·61 respectively. Type of exposure - mild, Degree of quality control - very good. Degree of workability = 0·08. use IS:10262-1982.

29 June, 2022