Question

What are the properties of high-strength concrete? How are these properties achieved?

Please I want the answer written here not on paper

Answer 1

The primary difference between high-strength concrete and normal-strength concrete relates to the compressive strength that refers to the maximum resistance of a concrete sample to applied pressure. Although there is no precise point of separation between high-strength concrete and normal-strength concrete, the American Concrete Institute defines high-strength concrete as concrete with a compressive strength greater than 6,000 psi.

Properties of high strength concrete are listed below

1.Better load bearing capacity

2.Enhanched mechanical properties. Values of modulus of Elasticity, compressive strength are higher than observed in normal concrete.

3. However its tensile capacity doesnt improve as compared to improvement in compression load capacity. Studies shows that for lower strength concrete, tensile strength may go upto 10% of compressive strength; however, for higher strength it reduces to 5%.

These enhanced properties can be achieved by....

- It has been seen that lowering water/cement ratio leads to higher compressive strength. To attain high strength of concrete water/cement ratio is reduced.

- Fine puzzolonic materials like fly ash, slica fumes are mixed along with cement to attain the properties

-Superplastisers are added to attain better workability and for achieving higher strength in concrete.