Effect of modified phosphogypsum on the dimensional stability of supersulfated cement-based materials

IF 6.5 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials Pub Date : 2024-12-28 DOI:10.1016/j.cscm.2024.e04170

Qingqing Jin , Lu Wang , Zhisheng Ren , Xinyu Li , Shuhua Liu

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Abstract

Compared to ordinary Portland cement (OPC), supersulfated cement (SSC) is an environmentally friendly cement. Phosphogypsum (PG) is commonly utilized as a sulfate activator in SSC. In this study, the effect of modified PG on the dimensional stability of supersulfated cement-based materials (SSCM) was investigated. Taking the point of decrease in internal relative humidity as the time-zero of autogenous shrinkage, the lime neutralized PG (NPG) reduced the autogenous shrinkage of SSCM by 15.03 % at 28 days and 16.26 % at 90 days, suppressing the development of autogenous shrinkage in SSCM. However, the calcined PG (CPG) displayed the opposite trend. Both modified PG improved the drying shrinkage of SSCM, and the NPG resulted in less water loss. Compared to OPC, SSCM exhibited a rapid increase in autogenous shrinkage relative to drying shrinkage, which was intensified with CPG. Obviously, the NPG demonstrated superior modification effects on the dimensional stability of SSCM compared to CPG.

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改性磷石膏对超硫酸盐水泥基材料尺寸稳定性的影响

与普通硅酸盐水泥（OPC）相比，过硫酸盐水泥（SSC）是一种环保型水泥。磷石膏（PG）是SSC中常用的硫酸盐活化剂。研究了改性PG对超硫酸盐水泥基材料（SSCM）尺寸稳定性的影响。以内部相对湿度下降点为自收缩的时间零点，石灰中和PG （NPG）在28天和90天使SSCM的自收缩分别减少15.03 %和16.26 %，抑制了SSCM自收缩的发展。然而，煅烧的PG （CPG）表现出相反的趋势。两种改性的PG均改善了SSCM的干燥收缩率，且NPG减少了水分散失。与OPC相比，SSCM表现出相对于干燥收缩的快速增加，而CPG则加剧了这种自收缩。显然，与CPG相比，NPG对SSCM的尺寸稳定性表现出更好的改性效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Construction Materials Multiple-

CiteScore

7.60

自引率

19.40%

发文量

842

审稿时长

63 days

期刊介绍： Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.