1)What is the difference of contraction joint & expansion joint in pqc road? 2) why need curing after concreteing? 3) what do u mean by M20 gread of concrete. 3,) what is scaffolding & why need? 4) difference b/w bleeding and segregation of concrete? 5) some questions come also sive analysis, moisture correction and cube test , & about BBS etc.

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Accepted Answer

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Contraction joints are used to prevent cracking due to shrinkage, while expansion joints allow for the expansion and contraction of concrete.
Curing is necessary after concreteing to prevent moisture loss, maintain proper hydration, and enhance the strength and durability of the concrete.
M20 grade of concrete refers to the mix ratio of cement, sand, and aggregate used in the concrete mix.
Scaffolding is a temporary structure used to support workers and materials during construction or maintenance work at heights.
Bleeding in concrete refers to the upward movement of water, while segregation refers to the separation of coarse aggregates from the concrete mix.
Sieve analysis is used to determine the particle size distribution of aggregates, moisture correction is done to adjust the water content in the mix, and cube test is performed to assess the compressive strength of concrete.
BBS stands for Bar Bending Schedule, which is a detailed reinforcement estimation and scheduling of bars in a structure.

Accepted Answer

3) M for mix which indicates mix desine & 20 is the strength on 28 days 20 N/MM² so m20 is designation of gread of concrete.

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