Properties enhancement of recycled coarse aggregates by pre-coating/pre-soaking with zeolite powder/calcium hydroxide
作者： Bao-ju Liu , Zhi-hai He , Kun-jie Fan , Jin-yan shi , Hai-bo Hu
DOI: 10.1016/J.CONBUILDMAT.2021.122888
关键词:
摘要: Abstract The reuse of construction and demolition waste by recycling as aggregates can not only protect the environment, but also alleviate shortage natural resources. However, application recycled in practical engineering is limited due to their shortcomings, such higher crush value water absorption, lower apparent density. In this study, four different treatments were designed modify coarse (RCAs) based on zeolite powder (ZP) calcium hydroxide (CH), which CH slurry pre-coating, solution pre-soaking, powder-cement (ZP-C) pre-coating ZP-C respectively. Moreover, macro-properties, micro-properties nanomechanical properties untreated treated RCAs have been investigated, results show that improve some extent. Meanwhile, width cracks (Wc) interfacial transition zone cement matrix decreases according scanning electron microscope observation. Among treatments, pre-coated present most significant improvement, absorption decrease 30.4% 19.8%, respectively, density increases 1.5%. addition, there linear relationships between Wc or RCAs. Furthermore, from perspective properties, elastic modulus main factor affecting marco-properties
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