Hot Weather Concreting

The repair and maintenance cost of any concrete structure is of such high magnitude that the need to construct durable structures has become imperative. Concrete/cement products have a similarity to Human beings. A newborn baby has to be taken care by means of timely vaccinations and other protection measures during the first few years after birth, the same applies to taking care of the structures built of concrete/cement mortar during the initial hours/days after they are cast in the structure.

Concreting during hot weather

Hot weather conditions can produce a rapid rate of evaporation of moisture from the surface of the concrete and accelerate setting time. Generally, high humidity tends to reduce the effects of hot weather in concreting. Special precautions need to be taken to ensure proper handling, placing, finishing and curing of concrete in hot weather.

What is hot weather concreting?

Any operation of concreting (other than steam curing) done at a temperature of above 40 degree Celsius is termed as hot weather concreting. High temperature increases the hydration of cement resulting in a faster setting which means the time available for workability of concrete is reduced.

Besides, high temperatures necessitates the addition of water at the project site to enhance the workability of concrete and thereby reduction in concrete strength. It may also result in the formation of cold joints in the structure cast. While initial strength may not suffer, the long-term strength (> 28 days strength) is affected.

High temperatures, wind velocity, and low relative humidity can affect fresh concrete in two important ways:

  1. Plastic shrinkage cracks may develop from high rate of evaporation or by cooling of the concrete from its elevated initial temperature.
  2. The evaporation rate can remove surface water necessary for hydration which may affect the cement hydration process in the initial stages resulting in lower concrete strengths.

Therefore, it is important to take necessary precautions and make the required arrangements before starting any construction work.

Read our next blog post to find out what measures you can take for a hassle-free construction work.

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