What is the relation between water-cement ratio and 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.

What is the relationship between water-cement ratio and compressive strength?

Compressive strength of concrete mixes were found to increase with both age and cement-water ratio. Any increase in cement-water ratio leads to increase in compressive strength, however, increase in cement-water ratio leads to decrease in aggregates content followed by decrease in density of concrete mix.

What factors affect creep?

Other factors affecting creep include type of cement, amount of cement paste, size and shape of concrete, amount of reinforcement (rebar), volume-to-surface ratio, temperature, and humidity.

What is water-cement ratio?

Abrams’ law (also called Abrams’ water-cement ratio law) is a concept in civil engineering. The law states the strength of a concrete mix is inversely related to the mass ratio of water to cement. As the water content increases, the strength of concrete decreases.

How is creep related to the strength of concrete?

Creep is _________ to the strength of concrete. Explanation: Creep increases with increase in water/cement ratio. In other words, it can also be said that creep is inversely proportional to the strength of concrete. 5.

What is creep of concrete?

Concrete creep is defined as: deformation of structure under sustained load. Basically as long term pressure or stress on concrete can make it change shape. This deformation usually occurs in the direction the force is being applied. Like a concrete column getting more compressed, or a beam bending.

Does water cement ratio affect strength concrete?

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.

How is water cement ratio calculated?

The water to cement ratio is calculated by dividing the water in one cubic yard of the mix ( in pounds) by the cement in the mix (in pounds). So if one cubic yard of the mix has 235 pounds of water and 470 pounds of cement- the mix is a . 50 water to cement ratio.

What is the relation between creep and time?

Creep tests of various materials performed at both constant load and constant stress have shown that ,the product of minimum creep rate and time to fracture is proportional to total creep deformation.

What increases the effect of creep?

Therefore, it can be said that creep increases with increase in water/cement ratio. In other words, it can also be said that creep is inversely proportional to the strength of concrete.

What is the maximum water cement ratio?

As per IS Code of practice 456–2000 , Maximum free water cement ratio is 0.50 for Reinforced Cement Concrete. The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix.

What is the water to cement ratio in concrete?

Water to cement ratio is ratio between the weight of water and the weight of cement that is used in a fresh concrete mix. Water to cement ratio is one the largest single factor on which strength of compacted concrete depends. Cured concrete strength depends on the two main factors i.e. Air voids in concrete depends on the water to cement ratio.

What is the W/C of concrete?

From the graph, one can see it forms a hyperbola shape. As water to cement ratio is increasing its compressive strength is gradually lacking behind. Duff Abrams in 1919 presented an equation that relates strength of concrete with water to cement ratio. W/c is the water to cement ratio in the concrete mix.

What is the water-cement ratio for 28-day compressive strength?

Table 5.17 is a general estimate of 28-day compressive strength versus water–cement ratio (or water-cementitious ratio). Values in this table tend to be conservative. Most state DOTs tend to set a maximum water–cement ratio between 0.40 and 0.50.

What are the factors that affect the strength of cured concrete?

Cured concrete strength depends on the two main factors i.e. Air voids in concrete depends on the water to cement ratio. There is an increase in air voids with the increase in weight of water. When this situation happens, then strength of concrete drops down.