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Concrete with Recycled Aggregates


Two-Stage production method

 


This study investigated the compressive and tensile strength of concrete made with recycled concrete aggregate gathered from demolition sites. 30% of both coarse and fine normal aggregate was replaced by recycled aggregate. The concrete was produced by the normal or the two-stage production method, in which coarse aggregate is first placed in a mold, and then grout injected via a pipe to fill the voids between the coarse aggregate. At water-cement ratios of 0.55 a compressive strength of about 20 N/mm2 (2.9 ksi) was obtained for both normal and recycled aggregate concrete, produced by both the normal and the two-stage production method. However, the two-stage production method resulted in a slightly lower tensile strength than the regular production method. These results suggest that recycled aggregate can be used for concrete structures.

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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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