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

the bubble tube parallel to the telescope of theodolite should be more sensitive since it controls a. vertical axis b. horizontal axis c. axis of bubble tube d. none of this

4 Answers  

how to calculate bottom width of staircase explain briefly

1 Answers  

How to calculate the wall thickness of building?

2 Answers  

where will u provide construction joint on slab?

4 Answers  

what is BPM in concrete demolition hammers. what is better a higher value or lower

0 Answers  

A bill was raised by contractor which read as follows 1.) Excavation in normal soil upto 1.5m - 250 cum 2.) Excavation in normal soil 1.5m to 3m - 240 cum 3.) Excavation in soft rock - 350 cum 4.) Excavation in hard rock - 250 cum 5.) Filling with available soil - 825 cum 6.) Filling with bought out soil - 1100 cum How can I verify the above quantities, especially for item no. 5 & 6? What checks are necessary before releasing the bill ?

5 Answers  

how many type of pipe using in plumbing?

3 Answers   Tulip,

what is the salry which I am expect in kolkata for diploma in civil engineer with 3 years 6 month exp.???

6 Answers  

How many no of cement bags required to do the concrete with the proportions 1:1.5:3 for 4inch thickness for 100 sqft?

3 Answers  

what is a well

0 Answers  

How we decide the the load combinations for design of RCC structures?

7 Answers  

1. What is coefficient use for calculation of shuttering. 2. What is coefficient use for calculation of reinforcement in one cum of concrete.

0 Answers   Ramky,