Concrete Strength Set – Set over Time Graph
The concrete must be cured, a process that consists of spraying water on the concrete surface to maintain a good moisture content inside the mixture, since the amount of water that is applied to make the mixture It is more than it should contain, so only the necessary amount has to be retained, avoiding excessive loss of water and in this way guaranteeing the obtaining of potential properties that increase durability and allow the concrete to reach its maximum resistance, ensuring the stability of the structural elements of a building.
To avoid the dryness of the concrete, it must be ensured that the curing is carried out after the final finish of the concrete has been obtained. This activity should last several days depending on the climate of the area since the hydration of the cement varies according to the temperature; slower at low temperatures and faster at high temperatures, in high temperature conditions it must be carried out during the next 7 days after the concrete has been poured until reaching 70% of its compressive strength, while in low temperature conditions it may take fewer days.
In addition to the traditional method, there are also other ways and materials to cure:
The continuous or frequent application of water by flooding, sprinkling, steam or covered with materials such as jute or cotton blankets, carpet, earth, sawdust, straw or hay
Prevent excessive water loss from the concrete surface by using materials such as plastic sheeting or waterproof paper, or by applying membrane-forming curing compounds to freshly sprayed concrete.
A predictable strength gain: Laboratory tests show that concrete in a dry environment can lose as much as 50% of its strength, compared to similar concrete that is cured in wet conditions. Concrete poured under high temperature conditions will gain early strength quickly, but later strengths can be reduced. Concrete poured in cold weather will take longer to build strength, delay removal of formwork and subsequent construction.
Improved durability: Well-cured concrete has better surface hardness and will better resist surface wear and abrasion, makes concrete more impervious to water, which prevents moisture and wax emulsion Selangor dissolved in water from entering the concrete, increasing durability and life in service.
Better service and appearance conditions: A concrete slab that has been allowed to dry too early will have a brittle surface with poor resistance to wear and abrasion. Proper curing reduces cracking, pulverization, and flaking.
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