Research Progress on Treatment Methods of Building Recycled Concrete Aggregates
FENG Chunhua1, HUANG Yihong1, CUI Buwen1, ZHU Jianping1, LI Dongxu2, GUO Hui1,*
1 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China 2 College of Material Science and Engineering, Nanjing University of Technology, Nanjing 210009, China
Abstract: With the acceleration of urbanization in China, a large number of dilapidated and old houses have been demolished and rebuilt, generating considerable amount of construction and demolition (C&D) waste such aswaste concrete. At present, the production of C&D waste not only occupies large quantities of land resources, but also causes secondary pollution to the environment. On the other hand, the consumption and exploitation of natural aggregate on ecological environment is also an urgent problem to be solved due to the increasing demand for aggregates such as sand and gravel in concrete industry. Therefore, how to recycle the C&D waste as aggregate has become one of the hot issues. Construction waste could directly be used as recycled concrete aggregate (RCA) after crushing. However, due to its disadvantages of large porosity, high water absorption and low strength, the use of RCA as aggregate tends to make the recycled aggregate concrete (RAC) product inferior in strength and durability, which limits the effective utilization of RCA. Therefore, many researches have been carried out on the modification of RCA in order to facilitate its reuse. The technical routes to the enhancement of RCA can be classified into removing attached mortar and strengthening attached mortar. The methods of removing attached mortar mainly includes acid treatment, mechanical grinding treatment, thermal treatment, heat grinding treatment, autogenous cleaning treatment, etc. Compared with the route of strengthening attached mortar, the removal of attached mortar has defects such as large energy consumption and incomplete strengthening. The strengthening of attached mortar can be realized by means of microbial mineralization treatment, carbonation treatment, mineral admixtures treatment, polymer emulsion treatment, etc. The process of microbial mineralization can fill the pores by produce calcium carbonate precipitate. It displays the best strengthening effect for RCA and features no pollution and low energy consumption, but the control of the strengthening factors is difficult nevertheless. The action of mineral admixtures treatment relies on the secondary reaction between mineral admixture and calcium hydroxide on the surface of RCA, as well as the filling effect of nanometer particles, resulting in obvious performance improvement of RCA. However, its strengthening stability is often reduced owing to the poor condition control in engineering applications. In a word, each strengthening method has certain advantages and disadvantages, and thus the single use of any individual method has nearly undoubted limitation in efficacy, which the combination of two or more enhancement methods can help to overcome. This review mainly summarizes the development trend, recovery technology, performance defects and enhancement methods of RCA, and also proposes some problems deserving attention and our preliminary understanding about the future directions. The paper is expected to provide certain theoretical support for relevant engineering and technological research.
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2022, Vol. 36 
