高温煅烧对废弃低碳胶凝材料物相、微观形貌和力学性能的影响研究
Study on the effect of high-temperature calcination on the phase composition, microstructure, and mechanical properties of waste low-carbon cementitious materials
关键词：
废弃低碳胶凝材料；煅烧处理；物相组成；微观形貌；抗压强度
Key words：
Waste low-carbon cementitious material; Calcination treatment; Phase composition; Microstructure; Compressive strength
刊期：
2025年第11期
DOI：
10.19761/j.1000-4637.2025.11.099.07
文章编号：
基金项目：
2023年江苏省高等学校基础科学（自然科学）研究重大项目（23KJA560003）；2024年江苏省创新训练项目（202411055038Y）；江苏省自然科学基金项目（BK20221227）；江苏高校“青蓝工程”项目；2025年河南省科技攻关项目（252102320361）；常州西太湖城乡建设碳达峰碳中和先导区示范项目（科技支撑项目）。
作者：
权家乐1，葛 培1，*，宋 杨1，吴宇轩1，李茂果1，颜钰航1，周军文1，陈晓红2，李 巍2
单位：
1.常州工学院 土木建筑工程学院，江苏 常州 213032；2.郑州铁路职业技术学院 铁道工程学院，河南 郑州 450000
摘要
摘 要：研究了煅烧温度（100~1 450 ℃）对废弃低碳胶凝材料物相组成、微观形貌的影响，以及煅烧温度（600~1 450 ℃）、水灰比（0.20、0.25、0.30）、养护龄期（30、60、90 d）对废弃低碳胶凝材料净浆试件抗压强度的影响，并进行了微观分析。结果表明：随着煅烧温度的升高，废弃低碳胶凝材料的物相变化主要表现为Ca(OH)2、CaCO3、AFt等分解及硅酸盐矿物形成；在相同煅烧温度下，水灰比越大，试件的30 d抗压强度越低；不同水灰比下，煅烧温度对 30 d抗压强度影响各异；当煅烧温度一定时，试件的抗压强度随着养护龄期的增加而增大；当养护龄期一定时，试件的抗压强度随着煅烧温度的升高基本先增后降；经1 200~1 450 ℃煅烧处理废弃低碳胶凝材料的净浆试件基体密实度较高。
Abstract: The effects of calcination temperature (100~1 450 °C) on the phase composition and microstructure of waste low-carbon cementitious materials, as well as the effects of calcination temperature (600~1 450 °C), water-cement ratio (0.20, 0.25, 0.30), and curing age (30, 60, 90 d) on the compressive strength of waste low-carbon cementitious materials pastes, and microanalysis were conducted. The results show that with the increase of calcination temperature, the phase changes of waste low-carbon cementitious materials primarily manifest as the decomposition of Ca(OH)2, CaCO3, AFt, etc., and the formation of silicate minerals. At the same calcination temperature, the higher the water-cement ratio, the lower the 30 d compressive strength of the specimens. At different water-cement ratios, the calcination temperature has varying effects on 30 d compressive strength. When the calcination temperature is constant, the compressive strength of the pastes increases with the increase of curing age. When the curing age is constant, the compressive strength of the pastes basically first increases and then decreases with the increase of calcination temperature. The pastes with waste low-carbon cementitious materials by calcination at 1 200~1 450 °C have a higher matrix density.
结论
（1）当煅烧温度为100~1 450 ℃时，废弃低碳胶凝材料的物相变化可分为四个阶段：第一阶段的煅烧温度为≥100 ℃且＜500 ℃，该阶段主要是Ca(OH)2、AFt、水滑石的分解；第二阶段的煅烧温度为≥500 ℃且＜800 ℃，该阶段主要是CaCO3的分解；第三阶段的煅烧温度为800~900 ℃，该阶段主要是C-S-H凝胶的分解与钙铝石、CaO、C2S、C3S的形成；第四阶段的煅烧温度为1 000~1 450 ℃，该阶段主要是C4AF的形成及钙铝石、CaO、C2S、C3S等含量的基本增多。
（2）当煅烧温度为200~400 ℃时，废弃低碳胶凝材料的微观形貌主要由Ca(OH)2和C-S-H凝胶构成；当煅烧温度为600~800 ℃时，废弃低碳胶凝材料中仍存在大量的C-S-H凝胶；当煅烧温度为1 000~1 200 ℃时，废弃低碳胶凝材料中有C4AF、C3A晶体以及较多C2S；当煅烧温度为1 300~1 450 ℃时，废弃低碳胶凝材料中的C2S含量增加，并伴有少量C3S、C4AF和C3A。
（3）当煅烧温度一定时，随着水灰比的增大，净浆试件的30 d抗压强度降低；当水灰比为0.20、0.25时，随着煅烧温度的升高，净浆试件的30 d抗压强度基本先增后降；当水灰比为0.30时，随着煅烧温度的升高，净浆试件的30 d抗压强度基本增大。当煅烧温度一定时，随着龄期的增加，净浆试件的抗压强度增大；当龄期一定时，随着煅烧温度的升高，净浆试件的抗压强度基本先增后降。
（4）经600 ℃、800 ℃煅烧处理的废弃低碳胶凝材料水化产物与P·O 42.5级水泥的水化产物基本一致，但CaCO3的衍射峰强度更显著；当煅烧温度提升至1 000 ℃时，废弃低碳胶凝材料水化产物虽与P·O 42.5级水泥水化产物种类相近，但出现了C2S、C3S衍射峰；经1 200~1 450 ℃煅烧处理后的废弃低碳胶凝材料水化产物中存在明显的C2S、C3S衍射峰。
（5）经600~1 000 ℃煅烧后的废弃低碳胶凝材料水化产物主要有C-S-H凝胶、Ca(OH)2和AFt，净浆试件内部孔隙较多，整体结构较疏松；经1 200~1 450 ℃煅烧后的废弃低碳胶凝材料水化产物中存在大量的C-S-H凝胶和少量的AFt，净浆试件基体密实度较高。
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引用本文
权家乐,葛培,宋杨,等.高温煅烧对废弃低碳胶凝材料物相、微观形貌和力学性能的影响研究[J].混凝土与水泥制品,2025(11):99-105.
QUAN J L,GE P,SONG Y,et al.Study on the effect of high-temperature calcination on the phase composition, microstructure, and mechanical properties of waste low- carbon cementitious materials[J].China Concrete and Cement Products,2025(11):99-105.
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