Which method is most suitable to measure the workability of a self-compacting co

Question

Which method is most suitable to measure the workability of a self-compacting concrete mix? a. Inverted cone flow test b. Compacting factor test C. Flow table test d. Slump test What is the main cause of bleeding in concrete? a. Too little use of water in the concrete mix b. Not enough use of fine aggregates and excess use of water in the concrete mix c. Too much use of cement in the concrete mix d. Too much use of coarse aggregates in the concrete mix When testing concrete for compressive strength, why does a 100 times 100 times 100 mm cube test specimen give a higher strength than a 100 phi times 200 mm cylinder test specimen? a. The cylinder is symmetrical about its vertical axis whereas the cube has sharp edges b. The cross-sectional area of the cube is larger than that of the cylinder C. The end restraining effect is felt throughout the height of the cube whereas a cylinder has a uniform stress distribution in the central region d. The cube is shorter in height than the cylinder and, hence, it can take more load

Explanation / Answer

Q1: compaction factor test is best suitable test for workability

Q2: of the given options B is correct because for less fine aggregate and excess use of water leads coarse aggregate to segregate or settle at bottom and water to top being low specific gravity compared to all the ingredients of concrete.

Q3: options D is correct because due to slenderness ratio as height of the specimen increases lambda increases but lambda is inversely proportional to load carrying capacity(Euler's crippling load formula in columns), so load carrying capacity decreases

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