A comparative study of mechanical and environmental properties of concrete using jujube nucleus as a coarse aggregate

作者：Shan Gao, Jieqi Li, Wei Wang, Mingming Zhang, Chuanxin Rong · 发表于：Case Studies in Construction Materials · 年份：2023 · DOI：10.1016/j.cscm.2023.e02013 · 被引用次数：10 · 研究领域：Concrete and Cement Materials Research、Microbial Applications in Construction Materials、Innovative concrete reinforcement materials

The ever-increasing generation of aggregates in the construction industry has caused a serious burden on the environmental protection of mountains and ecosystems. The shortage of natural coarse aggregate provides an impetus for the utilization of agricultural waste. Aiming to provide a cleaner option for the production of agricultural waste concrete originating from agricultural by-products jujube nucleus, the viability of using jujube nucleus as a substitute for coarse aggregate in the preparation of agricultural waste concrete is experimentally investigated in this study. The workability, weight loss, mechanical and environmental properties of jujube nucleus concrete (JNC) were evaluated with the variation of five different jujube nucleus (JN) replacement ratios (i.e., 0 %, 25 %, 50 %, 75 %, and 100 %), and five different temperatures (i.e. 20 °C, 200 °C, 400 °C, 600 °C, and 800 °C). The results show that as the JN replacement ratio increases, the slump values of JNC decreased gradually whilst the weight loss of JNC is more obvious than that of ordinary concrete with the increase in the elevated temperature, which is probably due to the growing amount of ettringite having chemical-bound water caused by sucrose molecules. In addition, the increase in the JN replacement ratio would decrease the compressive strength of JNC as compared to ordinary concrete, with a minimum and maximum reduction of about 26 % (25 %) and 97 % (100 %) respectively. As the elevated temperature incre...