Question

how to cure creep concrete or how to prevent it from happening... in detail ( the solution of this problem)

Answer 1

Creep is the characteristic of a substance which is exposed over time when the substance is subjected to the constant load for a long period. Creep is also seen in concrete where the strain in concrete increases under the constant load. This will impact the structural stability leading to deflection, cracking and even this strain will lead to failure of structural component when the creep factor is not taken into consideration during design process.

To overcome the creep in the concrete we can increase the strength parameters of the concrete. Higher the strength in concrete lower is the creep as the strength resists the overcoming load without undergoing deformation. The creep can be controlled by reducing the water content as much as possible without affecting the hydration as well as the workability property of concrete. This can be achieved by use of plasticizers and super plasticizers which will reduce a significant amount of water content without affecting the characteristic strength.

The second step to overcome the creep would be use of high percentage of aggregate in regard with the cement past as the aggregate undergoes very little creep. The aggregate used should be of larger size so as to resist the overcoming load without deforming. The creep is effective only the substance which lacks hardness or compressive strength and these are the characteristics of cement paste.

Thus it can be concluded that that higher percentage of cement paste will lead to higher amount of creep and vice versa.

Creep can only be controlled during design process only and if creep is not considered while design the deformation caused due to creep will only entertain repair and rehabilitation of structure.

The creep can also be controlled by subjecting the structure to steam curing rather than opting for the normal water curing. In this way the amount of water used for curing can be reduced and without compromising the hydration process but still a significant reduction in creep can be achieved.

The ultimate result of a structure undergoing creep is showcased in the form of deflection and the lower the deflection the lower is the effect of creep. In consideration with this factor the reinforcement in compression zone can be increased to sustain the load acting on member. The age plays a vital role in effective response to creep factor. Thus, to avoid creep at older age the design period of the structure should be more. If a normal structure is designed for 30 years then a structure which is susceptible to creep should be designed for 40 years so that the creep is ineffective for at least 30 years.

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