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Extra resources for Recycling of Demolished Concrete and Masonry (Rilem Report, No 6)

Sample text

41% of soluble chloride ion by weight of cement would be introduced into a recycled aggregate concrete, similar in composition to the original concrete, by way of recycled coarse and fine aggregate. It is recommended that standard specifications for recycled aggregate and recycled aggregate concrete should impose stringent limits on chloride contents of such aggregates. However, the threshold chloride concentration, below which there is no risk of reinforcement corrosion, remains a controversial issue.

It may be concluded that the water absorption of coarse recycled aggregates is much higher than the water absorption of original aggregates. This is due to the higher water absorption of old mortar attached to original aggregate particles. According to the Japanese Proposed Standard for the ‘Use of recycled aggregate and recycled aggregate concrete’ (6), recycled aggregates should not be used for concrete production when water absorption is more than 7% for coarse aggregate and more than 13% for fine aggregate.

135m) claim that most recycled aggregates would be less durable than original aggregates, and that recycled aggregates would fail to meet ASTM C 33 requirements to a sodium sulfate soundness of not more than 12% loss for coarse aggregate. 0% for coarse recycled aggregates produced from concrete, which was derived from a number of different pavements. 8%. 1% were measured for original coarse and fine aggregate used to produce original concretes. On the basis of these and other results, Fergus (7e) concluded that coarse recycled aggregates were superior to control natural gravel in those tests designed to evaluate the possible effect of aggregate properties with respect to the durability of concrete.

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