Study on the Performance of Synergistic Preparation of Sulphoaluminate Based Recycled Concrete by RP and RCA

Crystals

Qiuyi Li¹  Zhenwen Hu¹  Junzhe Liu¹  Yuanxin Guo¹  Xiangling Lin²  Shidong Zheng³ 

[1] College of Architectural Engineering, Qingdao Agricultural University, Qingdao 266109, China;School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;Shandong Junhong Environmental Technology Co., Ltd., Zibo 255000, China;

关键词: recycled powder (RP);    recycled coarse aggregate (RCA);    recycled concrete;    mechanical properties;    durability;    hydration products;   

DOI  :  10.3390/cryst11070748

来源: DOAJ

【 摘 要 】

In this paper, the properties of sulphoaluminate based recycled concrete, with high workability and low and medium strength, prepared by recycled powder (RP), recycled coarse aggregate (RCA), and high belite sulphoaluminate cement (HBSAC), were systematically studied. Under the condition of a water binder ratio of 0.45, sulphoaluminate based recycled concrete, with different mix proportions, was prepared by replacing sulphoaluminate cement with RP and natural coarse aggregate (NCA) with RCA. The workability, mechanical properties, durability, and hydration products of the prepared concrete were analyzed. The results showed that when RP and RCA were used together, the workability of recycled concrete could fully meet the pumping demand in actual construction. When the mass replacement rate of RP was less than 30% and that of RCA was less than 20%, the strength of recycled concrete could completely reach the design strength grade, while those that did not reach the design strength grade could reach the next grade. The durability performance was also good.

【 授权许可】

Unknown