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Effects of steam curing on propertiesof recycled concrete aggregate

Research on precast concrete materials and manufacturing techniques


In this work the effects of steam curing on the properties of recycled concrete aggregate were studied. The test results showed that the strength of concrete decreased as the recycled aggregate content increased. An initial steam curing regime increased the 1-day strength of the concrete but the corresponding 28 and 90-day strengths decreased. Furthermore, steam curing reduced the static modulus of elasticity of the concrete compared to that of the water cured concrete. However, the negative effect of steam curing diminished as the recycled aggregate content increased. Steam curing also decreased the drying shrinkage and increased the resistance against chloride ion penetration of the recycled concrete aggregate. The results demonstrate that one of the practical ways to utilize a higher percentage of recycled aggregates in concrete is “precasting” with an initial steam curing stage immediately after casting.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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