Rain during slab/roof casting || Tips and precautions during rainy season. बारिश में स्लॅब की ढलाई?

During rainy season precautions while slab casting
Water Content in the mixture
With the increased humidity(in the environment) and wetness of the raw materials (aggregate and sand), be particular about the amount of water that is going into the mixture. Excess water should be compensated to stay within the Design mix’s limit. Water-cement ratio can also be reduced by mixing suitable admixtures if the client permits.
Waterproofing Admixtures
The use of hydrophilic crystalline admixtures when laying the concrete provides concrete with the resistance to infiltration of water under hydrostatic pressure. The admixture reacts with water and cement particles to form calcium silicate crystals that block both the pores and microcracks in the concrete, preventing the passage of water. This reaction goes on for the entire life of concrete, serving to seal not only initial shrinkage cracks but also cracks that occur over time.
Timming
When you are preparing to pour concrete, make sure the weather conditions are not overly wet or windy. It is recommended to pour concrete when there has been more than 12hrs of dry weather.
Combat Heavy winds
Strong and resilient shuttering should be ensured before pouring concrete. Heavy winds may cause bleeding which may lead to shrinkage cracks.
Transportation of Concrete
In order to avoid traffic jams and congestions, the best accessible routes for RMC trucks should be figured out in advance. As most of the RMC trucks have an open top, any delay in the delivery may allow surplus water into the chamber, therefore, spoiling the concrete mix.
Assisting Covers
Plastic tarpaulins and rainproof canvas should be brought to the site in advance at the time of placing concrete. The covering of the area where the concrete is to be poured should be done keeping in mind the space to compact and finish the concrete surface. If possible cover the heaps of aggregate too, as when they become wet; they increase the water-cement ratio.
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