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Experimental Study on the Preparation of Recycled Admixtures by Using Construction and Demolition Waste

1
School of Civil Engineering, Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao 266033, China
2
School of Architecture Engineering, Qingdao Agricultural University, Qingdao 266109, China
3
China Academy of Building Research, Beijing 100013, China
4
Center for Infrastructure Engineering, School of Computing, Engineering and Mathematics, Western Sydney University, Sydney, NSW 2751, Australia
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(10), 1678; https://doi.org/10.3390/ma12101678
Received: 5 May 2019 / Revised: 18 May 2019 / Accepted: 21 May 2019 / Published: 23 May 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

The use of construction and demolition waste (CDW) to prepare recycled admixtures is of great significance for the complete resource reutilization of CDW. In this paper, different kinds of CDW were prepared into recycled powder (RP) with a specific particle size (0–45 µm or 0–75 µm). The fineness, water requirement ratio (WRR), fluidity, loss on ignition (LOI), strength activity index (SAI) and compatibility of cement and superplasticizer (CCS) were examined. The above test results were analyzed by advanced analysis tools, such as laser particle size analysis, XRD, XRF, DSC-TGA, SEM, and BET. The properties of different types of RPs varied greatly, which was closely related to the microstructure, particle morphology and chemical composition of the RP. The experimental results showed that all kinds of RPs after grinding had a high fineness and good particle size distribution, and the mineral composition was dominated by SiO2 with the content exceeding 50%. The WRR of various RPs was between 105% and 112%, and the SAI was between 68% and 78%, but the LOI varied greatly. Different types of RPs had a negative impact on the CCS, but the compatibility of cement and naphthalene-based superplasticizer was less affected. The content of recycled brick powder (RBP) in a hybrid recycled powder (HRP) was an important factor. When the content of RBP in HRP exceeded 50%, the HRP could meet the basic performance requirements of fly ash. View Full-Text
Keywords: Construction and demolition waste; recycled powder; basic properties; compatibility of cement and superplasticizer; microstructure Construction and demolition waste; recycled powder; basic properties; compatibility of cement and superplasticizer; microstructure
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Li, S.; Li, Q.; Zhao, X.; Luo, J.; Gao, S.; Yue, G.; Su, D. Experimental Study on the Preparation of Recycled Admixtures by Using Construction and Demolition Waste. Materials 2019, 12, 1678.

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