硫酸钙晶须对粉煤灰-水泥复合材料水化和微观结构的影响

doi:10.16552/j.cnki.issn1001-1625.2026.0080

硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (7): 2428-2437.DOI: 10.16552/j.cnki.issn1001-1625.2026.0080

硫酸钙晶须对粉煤灰-水泥复合材料水化和微观结构的影响

张文琮¹(), 保钦凡¹, 王雨秋¹, 满保良¹, 黄果²^,³, 郭荣鑫²^,³()

^1.云南云岭桥梁智能建造有限公司，昆明 650200
^2.昆明理工大学建筑工程学院云南省土木工程防灾重点实验室，昆明 650500
^3.昆明理工大学建筑工程学院云南省绿色建造与智慧运维国际联合实验室，昆明 650500

收稿日期:2026-01-20 修订日期:2026-02-28 出版日期:2026-07-15 发布日期:2026-08-13
通信作者: 郭荣鑫，博士，教授。E-mail： guorx@kmust.edu.cn
作者简介:张文琮（1975—），男，高级工程师。主要从事固废资源化利用方面的研究。E-mail： 1711240146@qq.com
基金资助:
云南交投集团云岭建设有限公司科技项目(YLJS-KF-2024-13)

Effects of Calcium Sulfate Whiskers on Hydration and Microstructure of Fly Ash-Cement Composites

ZHANG Wencong¹(), BAO Qinfan¹, WANG Yuqiu¹, MAN Baoliang¹, HUANG Guo²^,³, GUO Rongxin²^,³()

^1.Yunnan Yunling Bridge Intelligent Construction Co.，Ltd.，Kunming 650200，China
^2.Yunnan Key Laboratory of Disaster Reduction in Civil Engineering，Faculty of Civil Engineering and Mechanics，Kunming University of Science and Technology，Kunming 650500，China
^3.Yunnan International Joint Laboratory of Green Construction and Intelligent Maintenance，Faculty of Civil Engineering and Mechanics，Kunming University of Science and Technology，Kunming 650500，China

Received:2026-01-20 Revised:2026-02-28 Published:2026-07-15 Online:2026-08-13

摘要/Abstract

摘要：

固体废弃物的高值化协同利用已成为水泥基材料绿色低碳发展的重要途径。本文研究了1%、3%、5%（质量分数）掺量硫酸钙晶须对粉煤灰-水泥复合材料的微观结构、水化反应及力学性能的影响。实验结果表明：掺入1%硫酸钙晶须可促进铝酸盐水化反应及钙矾石生成，从而优化粉煤灰-水泥复合材料的微观结构致密性和力学性能。然而，当硫酸钙晶须掺量大于1%时，随着硫酸钙晶须含量的增大，过量硫酸盐会导致体积稳定性变差，进而降低粉煤灰-水泥复合材料强度。综合分析表明，硫酸钙晶须在粉煤灰-水泥复合材料体系中最佳掺量为1%。本研究为硫酸钙晶须在粉煤灰-水泥复合材料中的设计提供了理论依据。

关键词: 硫酸钙晶须, 粉煤灰, 粉煤灰-水泥复合材料, 水化, 微观结构

Abstract:

The high-value co-utilization of solid waste has become an important way to promote the green and low-carbon development of cement-based materials. This paper investigated the effects of 1%， 3%， and 5% （mass fraction） calcium sulfate whiskers on the microstructure， hydration reaction， and mechanical properties of fly ash-cement composites. Experimental results show that the addition of 1% calcium sulfate whiskers promote the hydration reaction of aluminate phases and the formation of ettringite， thereby optimizing the microstructure density and mechanical properties of fly ash-cement composite materials. However， when the calcium sulfate whisker content over 1%， with the increase of calcium sulfate whisker content， the excessive sulfate ions lead to the formation of a large amount of expansive ettringite in the later stage， causing cracks in the microstructure and thus reducing the strength of fly ash-cement composite materials. Comprehensive analysis shows that calcium sulfate whiskers exhibit optimal performance at 1% content in the fly ash-cement composite material system. This study provides a theoretical basis for the design of calcium sulfate whiskers in fly ash-cement composite materials.

Key words: calcium sulfate whisker, fly ash, fly ash-cement composite material, hydration, microstructure

中图分类号:

TU528

张文琮, 保钦凡, 王雨秋, 满保良, 黄果, 郭荣鑫. 硫酸钙晶须对粉煤灰-水泥复合材料水化和微观结构的影响[J]. 硅酸盐通报, 2026, 45(7): 2428-2437.

ZHANG Wencong, BAO Qinfan, WANG Yuqiu, MAN Baoliang, HUANG Guo, GUO Rongxin. Effects of Calcium Sulfate Whiskers on Hydration and Microstructure of Fly Ash-Cement Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(7): 2428-2437.

图/表 12

图1 原材料的粒径分布、XRD谱及SEM照片

Fig.1 Particle size distribution， XRD patterns， and SEM image of raw materials

表1 原材料的化学组成

Table 1 Chemical composition of raw material

Material	Mass fraction/%
Material	SiO₂	Al₂O₃	SO₃	CaO	TiO₂	Fe₂O₃	MgO	LOI^a
Cement	20.74	5.54	3.91	59.74	1.26	4.12	2.68	2.01
Fly ash	52.04	23.56	0.83	4.67	3.42	11.02	1.30	3.16
Gypsum	0.06	0.03	54.00	38.70	—	—	0.09	7.12
CSW	0.09	0.03	56.89	42.86	—	—	0.02	0.11

表2 混合物的配合比

Table 2 Proportion of mixture

Sample No.	Mass fraction/%
Sample No.	Cement	Fly ash	CSW	Gypsum	Water
OPC	100	0	0	0	50
FA30	70	30	0	0	50
FA30-W1	70	30	1	0	50
FA30-W3	70	27	3	0	50
FA30-W5	70	25	5	0	50
FA30-G3	70	27	0	3	50

图2 不同龄期样品的抗压强度

Fig.2 Compressive strength of samples at different ages

图3 样品抗压强度与7 d累积水化热之间的线性关系

Fig.3 Linear relationship between compressive strength and accumulated hydration heat at 7 d of samples

图4 不同矿物掺合料对水泥浆体水化热的影响

Fig.4 Effects of different mineral admixtures on hydration heat of cement paste

图5 与水泥样品归一化后浆体的水化热及累积水化热

Fig.5 Hydration heat and cumulative hydration heat of mixed paste normalized to cement

图6 不同龄期样品的TG-DTG曲线

Fig.6 TG-DTG curves of samples at different ages

图7 不同龄期下样品的CH和Wb含量

Fig.7 CH and Wb content of samples at different ages

图8 养护28 d样品的XRD谱

Fig.8 XRD patterns of samples after 28 d of curing

图9 养护28 d样品的FTIR谱

Fig.9 FTIR spectra of samples after 28 d of curing

图10 养护28 d样品的SEM照片

Fig.10 SEM images of samples after 28 d of curing

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硫酸钙晶须对粉煤灰-水泥复合材料水化和微观结构的影响

Effects of Calcium Sulfate Whiskers on Hydration and Microstructure of Fly Ash-Cement Composites

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