What is the relation between strength of concrete and water-cement ratio?

Water cement ratio inversely related with the strength of concrete if water cement ratio increases then the strength decreases and vice versa. And directly related to the workability because if water cement ratio increases then the concrete more wet and more consistence and can be placed easily.

What is the relationship between workability and strength of a metal?

Increase in temperature brings down strength values and increases ductility. Workability will be fairly improved as the temperature of working is higher. As strain rate is increased ductility comes down and workability decreases and vice versa. There is no test for assessing workability of metals.

What increases the workability of concrete?

The higher value of the water-cement ratio would increase the workability of the concrete but may reduce the compressive strength of the mix. Hence, an increase in water content must be accompanied by an increase in cement content.

What factors affect strength of concrete?

Factors Affecting Strength of Concrete

• Quality of Raw Materials.
• Water / Cement Ratio.
• Coarse / fine aggregate ratio.
• Aggregate / Cement Ratio.
• Age of concrete.
• Compaction of concrete.
• Temperature.
• Relative humidity.

How does water cement ratio affects workability?

Generally, a water cement ratio of 0.45 to 0.6 is used for good workable concrete without the use of any admixture. Higher the water/cement ratio, higher will be the water content per volume of concrete and concrete will be more workable. For machine mixing, the water/cement ratio can be reduced.

What is water cement ratio and explain its effect on workability and strength?

The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form. Workability can be resolved with the use of plasticizers or super-plasticizers.

How workability of concrete affects the productivity of concrete?

If we increase the cement quantity, more will be the cement paste to cover the surface of the aggregate and for void filling. It helps in reducing the friction between aggregates resulting in smooth movement of aggregates in transporting, placing, and compacting of concrete.

What is workability of a concrete?

Workability of Concrete is a broad and subjective term describing how easily freshly mixed concrete can be mixed, placed, consolidated, and finished with minimal loss of homogeneity.

What factors affect the strength and workability of concrete?

Factors which affect workability of concrete are:

• Cement content of concrete.
• Water content of concrete.
• Mix proportions of concrete.
• Size of aggregates.
• Shape of aggregates.
• Grading of aggregates.
• Surface texture of aggregates.
• Use of admixtures in concrete.

What is concrete workability?

How is workability of concrete calculated?

1. Slump Test. The concrete slump test or slump cone test is the most common test for workability of freshly mixed concrete which can be performed either at the working site/field or in the laboratory.
2. Compaction Factor Test.
3. Flow Test.
4. Vee Bee Consistometer Test.
5. Kelly Ball Test (Ball Penetration Test)