Which Is The Best Time For Constructing ?, Is Proper curing increases the life span of a building?

By Mr. Neemani Sreedhar

While some take up curing religiously by pouring water even when not required, others treat it as a mere formality and continue with construction even before the process of curing is complete.

Despite well designed plans, best material &  trained workmanship, there is a risk of a structure’s life span getting shortened if attention is not paid to proper curing.

While some take up curing religiously by pouring water even when not required, others treat it as a mere formality & continue with construction even before the process of curing is complete.

Duration for Curing ..!

Many people have many doubts regarding the duration for which curing should be done.

What is curing?

How long should it be continued?

And most importantly, why have the process of curing itself?

There are 2 types of chemical reactions, one that releases heat during the process, it is called - Exothermic and another that absorbs heat, it is called Endothermic.

Construction Material Expert, Mr. L.H. Rao gives best tips for..!

^ The reaction that occurs during the process of mixing cement with water is exothermic because of the presence of lime stone. Because of this heat generation, the water content in the mortar (or concrete mix) evaporates even before the compound gains strength & hence there is a need to preserve the ambient temperature of the structure, .

^ Depending on the type of cement used, the concrete /  mortar mix takes certain time to strengthen. Till the time a structure attains maximum strength, ambient temperature, and in turn availability of water content, should be ensured.

^ Chemical reactions in a cement compound takes place only in the presence of water and the best way to maintain ambient temperature is through curing, Mr. L.H. Rao points out.

Best Time For Constructing..!

^ Usually, the seasons that have cooler temperatures are considered to be the best times for constructing a building. This is because of the fact that outside temperature will not be high.

^ If the construction has to be taken up during hotter months, extra care should be taken up while curing.

Simple Thumb..!

^ There is a simple thumb rule that one should follow. If there is a water runoff when one pours water on a new construction, curing should be stopped. The hotter the outside temperatures more amount of curing is required.

^ Apart from seasons, the time taken for curing also changes according to the type of cement used. OPC (Ordinary Portland Cement) gains strength quickly & hence extended period of curing is not required.

Alternative Cements..!

^ The alternative cements such as fly ash based PPC (Portland Pozzolana Cement) and slag based PSC (Portland Slag Cement) takes more time to set in & hence require longer duration of curing.

^ PPC &  PSC take more time to set in. But if this time is allowed, structures using these cements are stronger than those using OPC due to their inherent chemical composition.

^ Using the construction material becomes tricky during hot seasons. Even the temperature of steel rods & gravel impacts the final strength.

^ At times, engineers are forced to reduce the temperature of the ingredients by using iced water even before mixing the compound.

^ If one has to take up construction during hotter seasons, it is better to reduce the temperature of ingredients before forging a structure. This reduction of temperature along with better curing can help structure gain strength to last longer.

Slab Ponding..!

^ There is also a misconception among the people about the importance of curing the whole structure. While slabs are left for curing for longer periods through ‘slab ponding’, not much of importance is given to the curing of columns. For a stronger building, columns should be cured by wrapping them in wet gunny bags for at least 16 hours.

Src: Hindu

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