Influence of Quality and Replacement Rate of Recycled Coarse Aggregate on the Frost Resistance of Recycled Concrete

Abstract:

Compared with natural aggregate, the content of hardening cement in recycled aggregate is larger, which leads that the water absorption of recycled aggregate is larger and its performance such as robustness is poorer. And the engineering field pays much attention to the problem of the recycled fine aggregate which can be used in the durability requirements of recycled concrete or not. Using the method of fast freezing and thawing the influence of quality and replacement ratio of recycled coarse aggregate on the frost resistance of recycled concrete was researched basing on ordinary concrete frost resistance performance. The results showed that, in terms of the frost resistance capacity, the order is in: ordinary concrete>high-quality recycled coarse aggregate concrete>normal quality recycled coarse aggregate concrete. After 250 freeze-thaw cycles, the mass loss rate of general quality recycled coarse aggregate concrete is 5%, relative dynamic elastic modulus is 60% when replace rate was 100%.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 2046-2049
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.2046
• Online since: June 2017
• Authors: Gong Bing Yue*, Qiu Yi Li, Jian Lin Luo, Yuan Xin Guo
• Keywords: Concrete, Frost Resistance, Mass Loss Rate, Recycled Coarse Aggregate, Relative Dynamic Elastic Modulus, Replacement Rate

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