可完全循环水泥砂浆配料制备贝利特水泥熟料的性能研究

摘要/Abstract

摘要： 可完全循环混凝土是指废弃后可直接作为水泥生料煅烧制备熟料的混凝土,现有研究中目标熟料均为普通硅酸盐水泥熟料。本文制备了以高贝利特水泥熟料(HBC)与高铁相高贝利特水泥熟料(HFBC)为目标再生熟料的可完全循环水泥砂浆(CRM)。对比研究了以CRM与化学分析纯试剂(对照组)为生料时,相同率值、煅烧温度对水泥生料易烧性、熟料组成与性能的影响规律。结果表明,以CRM配料的生料具有更好的易烧性与更低的碳排放,但熟料强度对温度更加敏感,烧成范围变窄。以CRM为水泥生料制备的HBC中C₃S的生成受到较明显的抑制,早期水化活性与强度降低,但后期水化能力较强。由于多种杂质离子元素的存在,熟料中出现了α′-C₂S矿相。对于HFBC组,以CRM配料的实验组水化活性较对照组有了明显的提升。研究工作为可完全循环混凝土的设计提供一定的指导。

关键词: 可完全循环水泥砂浆, 贝利特水泥熟料, 生料易烧性, 力学性能, 水化活性

Abstract: Completely recyclable concrete refers to concrete that can be directly used as raw cement materials for calcination and preparation of clinkers after being demolished. In current studies, the target clinker is ordinary Portland cement clinker. In this study, the completely recyclable mortar (CRM) with high belite cement clinker (HBC) and high ferrite-belite cement clinker (HFBC) as target regenerated clinker was prepared. A comparative study was conducted on the effects of the some rate value and calcination temperature on the burnability of cement raw materials, clinkers’ compositions, and performance using fully CRM and chemical analysis pure reagents (as a control group) as raw materials. The results indicate that the clinker obtained from CRM has a higher rate of later strength growth than the control group. Raw materials with CRM have better burnability and lower CO₂ emissions. However, the strength of clinker is sensitive to temperature, and the range of calcination temperature is narrow. The generation of C₃S in HBC prepared with CRM is significantly inhibited, and the early hydration activity and strength decrease, but the later hydration ability is improved. Due to the presence of impurity ions, here is α′-C₂S mineral phase in clinker. For HFBC group, the hydration activity of experimental group with CRM significantly improves compared to the control group. The research can provide support for the design of completely recyclable concrete.

Key words: completely recyclable cement mortar, belite cement clinker, burnability of raw material, mechanical property, hydration activity

中图分类号:

TU528

崔莹莹, 何健辉, 吕民望, 杨露, 刘云鹏. 可完全循环水泥砂浆配料制备贝利特水泥熟料的性能研究[J]. 硅酸盐通报, 2024, 43(9): 3348-3358.

CUI Yingying, HE Jianhui, LYU Minwang, YANG Lu, LIU Yunpeng. Performance of Belite Cement Clinker from Completely Recyclable Cement Mortars[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3348-3358.

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