Answer / anupam nath

Chemical reaction of cement and water will gives strength
to concrete. As soon as concrete placed in its place and
normal weather condition, during day time water percentage
in concrete evaporate and to retain the water in concrete
for at least seven days, we used to cure the structure by
sprinkling water on it.Curing starts after 24 hrs of
pouring.

Answer / manoj p. v

when Portland cement is mixed with water a chemical reaction called hydration takes place. The extent to which this reaction is completed influences the strength and durability of the concrete. Freshly mixed concrete normally contains more water than is required for hydration of the cement; however, excessive loss of water by evaporation can delay or prevent adequate hydration. The surface is particularly susceptible to insufficient hydration because it dries first. If temperatures are favourable, hydration is relatively rapid the first few days after concrete is placed; however, it is important for water to be retained in the concrete during this period, that is, for evaporation to be prevented or substantially reduced.

Answer / padmanabhan

to prevent the reduction of volume/shrinkage of concrete..

Answer / vijay kumar

The curing period depends upon the type of cement used, mixture proportions, required strength, size and shape of member, ambient weather, future exposure conditions, and method of curing. Since all desirable properties are improved with curing, the period should be as long as practical. For most concrete structures, the curing period at temperatures above 5º C (40º F) should be a minimum of 7 days or until 70% of the specified compressive or flexural strength is attained. The period can be reduced to 3 days if high early strength concrete is used and the temperature is above 10º C (50º F)

Answer / adeel

to avoid cracks that are generated by heat of cement.

Answer / bethina sudheer

cement in the concrete attains strength with water

what is the quantity of cement,sand and aggregate in 600*600*1600 mm in 1:4:8

8 Answers   L&T, RPG,

WHAT IS THE SPLICE LENGTH WHEN WELD IN REINFORCEMENT STEEL

8 Answers  

21. Are you able to work under pressure?

1 Answers  

what is weight ratio for concerete grades M5 to M40

1 Answers   UBF,

what should be the PCC ratio to construct a plinth of (40x40x4)ft...??also its estimated cost??

0 Answers  

How much bricks in 1sq.meter with thickness 9inch.

3 Answers  

Brick size 230X115X150mm, how many bricks, quantity of sand, cement required to construct 10 sq mtrs of 115mm thick brick wall.

3 Answers   Feana,

What is the life of anaerobic Digester if it is used for municipal solid waste digetion.

0 Answers  

what is the hanekom repairing material after concreting work

0 Answers   Lafarge,

In footing (mat) if two different dia of rods are to be used which rod should be placed at top and bottom ( eg. 10mm & 16mm dia rods)

7 Answers  

How to calculate the steel for 392c.meter*450c.meter rcc slab

2 Answers  

factory shed foundation l=4, b=3' d=8' rcc foudation for top to bottom pl tell me cement ,steel ,sand ,labour cost ,excavtion,soil is weak not so hard

0 Answers