石灰激发低碳胶凝材料的水化特性与力学性能

doi:10.3785/j.issn.1008-973X.2025.06.016

浙江大学学报(工学版)

2025, Vol. 59

Issue (6): 1253-1264 DOI: 10.3785/j.issn.1008-973X.2025.06.016

土木工程、交通工程

石灰激发低碳胶凝材料的水化特性与力学性能

吴萌1,2,3(

),张云升2,*(

),刘志勇2,刘诚2,佘伟2,王立国2,马瑞3

1. 安徽理工大学土木建筑学院，安徽淮南 232001
2. 东南大学材料科学与工程学院，江苏南京 211189
3. 安徽建筑大学安徽省先进建筑材料重点实验室，安徽合肥 230022

Hydration characteristics and mechanical performance of lime and gypsum-activated low carbon cementitious materials

Meng WU1,2,3(

),Yunsheng ZHANG2,*(

),Zhiyong LIU2,Cheng LIU2,Wei SHE2,Liguo WANG2,Rui MA3

1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
2. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
3. Anhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China

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摘要：

为了降低传统水泥工业对环境的负荷，将矿渣粉与粉煤灰复合作为主要前驱体，设计和制备了新型石灰石膏激发低碳胶凝材料（LCM）. 采用X射线衍射定量分析（QXRD）、热重分析（TGA）、傅里叶变换红外光谱（FTIR）、压汞法（MIP）、扫描电镜-能谱仪分析（SEM-EDS）等测试方法分析LCM水化特性并探究采用不同质量比的LCM的力学性能演变规律. 结果表明：LCM水化产物主要包括钙矾石、低钙硅原子比C-(A)-S-H凝胶及少量AFm-CO₃；在水化早期，钙矾石大量形成，会导致LCM的热流曲线在水化减速期出现新的水化放热峰；在长期水化后，杆棒状钙矾石晶体作为骨架嵌入C-(A)-S-H凝胶当中并形成致密整体，此时LCM孔隙结构具有较高的曲折度与较低的连通度. 通过优化LCM质量比，可显著提升LCM各龄期的力学性能，其中C3砂浆28 d抗压强度可达53.5 MPa，与对照组相比，抗压强度提高37.9%，且后期强度持续增加. 在LCM中掺入少量硅酸盐水泥，能提高液相碱性，从而有效促进矿物掺和料的水化反应，并提高LCM整体水化速率，进而提升LCM中后期力学性能.

关键词： 石灰; 胶凝材料; 水化产物; 孔隙结构; C-(A)-S-H

Abstract:

The composite slag and fly ash were used as the main precursors to design and prepare a novel type of lime and gypsum-activated low carbon cementitious material (LCM), to decrease the environmental loading of the cement industry. The evolution rules of mechanical properties of LCM mixtures with different mass ratios and the hydration characteristics of LCM were analyzed via quantitative X-ray diffraction (QXRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), mercury intrusion porosimetry (MIP) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) method. Results showed that the hydration products of LCM were mainly composed of ettringite, C-(A)-S-H gel with a low Ca/Si atomic ratio, and a small amount of AFm-CO₃. A large amount of ettringite formed in the early stage of hydration, causing the heat flow curve of LCM to exhibit a new exothermic peak during the decelerating period of hydration. After long-term hydration, rod-like ettringite crystals were embedded into C-(A)-S-H gel as the skeleton, forming a dense paste, and the pore structure of LCM had a high tortuosity and low connectivity. The mechanical performance of LCM at various ages was significantly increased by optimizing the mixture proportion. The compressive strength of C3 mortar at 28 days could reach 53.5 MPa, which represented an increase of 37.9% compared to the control group, and the strength continued to increase over time. A small amount of Portland cement was introduced into the LCM, which effectively increased the alkalinity of the liquid phase, promoted the hydration reaction of the mineral admixtures and increased the overall hydration rate of LCM, thereby improving the mechanical properties of LCM in the mid-to-late stages.

Key words: lime cementitious material hydration product pore structure C-(A)-S-H

收稿日期: 2024-08-29 出版日期: 2025-05-30

CLC:

TU 528

基金资助: 国家自然科学基金资助项目（52208228, U21A20150, 52078125）；国家重点研究计划资助项目（2019YFC19044900）；安徽省先进建筑材料重点实验室开放课题资助项目（JZCL202406KF）.

通讯作者: 张云升 E-mail: wumengseu@qq.com;zhangys279@163.com

作者简介: 吴萌（1988—），男，副教授，从事低碳水泥基材料研究. orcid.org/0000-0003-4476-9690. E-mail：wumengseu@qq.com

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引用本文:

吴萌,张云升,刘志勇,刘诚,佘伟,王立国,马瑞. 石灰激发低碳胶凝材料的水化特性与力学性能[J]. 浙江大学学报(工学版), 2025, 59(6): 1253-1264.

Meng WU,Yunsheng ZHANG,Zhiyong LIU,Cheng LIU,Wei SHE,Liguo WANG,Rui MA. Hydration characteristics and mechanical performance of lime and gypsum-activated low carbon cementitious materials. Journal of ZheJiang University (Engineering Science), 2025, 59(6): 1253-1264.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2025.06.016 或 https://www.zjujournals.com/eng/CN/Y2025/V59/I6/1253

表 1 原材料化学组成

表 2 LCM组成质量分数表

图 1 LCM样品的XRD图谱

图 2 各LCM样品的XRD图谱定量分析结果

图 3 各LCM样品的FTIR图谱

图 4 LCM样品水化90 d后的TGA曲线

表 3 LCM各样品的氢氧化钙与化学结合水质量分数

图 5 C3样品水化3、90 d时的微结构SEM图像

图 6 水化90 d时LCM样品的MIP试验测试结果

表 4 LCM样品孔隙结构参数

图 7 各LCM样品的水化放热速率和累积水化热曲线

图 8 石膏质量分数对LCM水化放热的影响

图 9 LCM凝结硬化前浆体和硬化浆体孔溶液的pH值

图 10 各LCM样品力学性能演变规律

表 5 原材料与LCM样品的碳排放

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