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how to natural curing for concrete blocks
Sep 08, 2017


In countries where the climate is favorable, green blocks are moist cured at normal temperature of 20to 37(as in the south of China), this type of curing which at 4 days would normally give 40% of its ultimate strength, initially, green blocks should be placed in a shaded area or enclosed chambers for about 8-12 hous(depends on relative weather condition i.e temperature,humidity etc) After that, the blocks can be transported to an assembly yard for further curing for about 28 days to reach 99% of its maximum strength. For optimal final products, the fresh blocks need to be sprinkled daily, for the first 7 days to maintain the moisture content for higher reactivity of cement with sand.

Length of curing

Type of   Portland Cement       Curing timesConcrete   Surface Temperature
Type I                                                 5 days70 ºF or higher
7 days50ºF-70ºF
Type II                                                 3 days5 ºF
Other than Type I or Type II            7 days70ºF
14 days0-70ºF

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