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Abstract
This paper presents a new surface treating technology using silane coupling agent KH-550 to strengthen coarse recycled ceramic vase aggregates (CRCVA) with the purpose of enhancing the bond strength between CRCVA and mortar, and consequently improving the properties of recycled concrete made with CRCVA. In the proposed technology, the optimal KH-550 solution concentration and recycled aggregates’ soaking time are 4% and 100 min, respectively, resulted from orthogonal test. Mechanical and durability property tests, on concrete mix made with coarse natural aggregates substituted by surface-treated CRCVA, were conducted to determine the optimal incorporating ratio of CRCVA and verify the feasibility of the proposed technology. Test results are highly promising up to an incorporating ratio of coarse natural aggregates with CRCVA of 60%, and show that the proposed technology could enable the recycled concrete mix, made with treated CRCVA, maintain better properties than that of natural concrete containing only coarse natural aggregates. Supplement verification through stereoscopic microscope test further confirms that the proposed technology could make the interfacial transition zone much more compact, resulting an efficient bond strength between ceramic aggregates and mortar.
Acknowledgements
The authors wish to acknowledge the financial support from the National Natural Science Foundation of China (NSFC) [Project No: 51378206]; National Twelfth-five Scientific Support plan of China [Project No: 2015BAL03B02]. Moreover, the authors also wish to express their thanks to Dr. Kai Wang for his suggestion on the test programme, and Tao Wang for providing information on properties of natural limestone aggregates.