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how to natural curing for concrete blocks
Sep 08, 2017


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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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