硅酸盐学报

环糊精对铝酸三钙-石膏体系水化过程的影响

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阎培渝 , 陈炜一

硅酸盐学报 | 研究论文 2026,54(4): 1419-1425

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硅酸盐学报 | 研究论文 2026, 54(4): 1419-1425

环糊精对铝酸三钙-石膏体系水化过程的影响

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阎培渝, 陈炜一

作者信息

清华大学土木工程系，北京 100084

阎培渝（1955—），男，博士，教授。

YAN Peiyu (1955-), male, Ph.D., Professor. E-mail: yanpy@tsinghua.edu.cn

Effect of Cyclodextrin on Hydration of Tricalcium Aluminate-Gypsum

Peiyu YAN, Weiyi CHEN

Affiliations

Department of Civil Engineering, Tsinghua University, Beijing 100084, China

出版时间: 2026-01-29 doi: 10.14062/j.issn.0454-5648.20250504

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摘要

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影响硅酸盐水泥早期放热特性的主要熟料矿物是铝酸三钙（C₃A）。为了深入研究可降低混凝土开裂风险的混凝土水化温升抑制剂的作用机理，探讨了混凝土水化温升抑制剂的主要功能成分环糊精对C₃A-石膏体系水化过程的影响。测量了不同环糊精掺量的C₃A-石膏浆体的水化放热曲线。使用定量X射线衍射法对水化产物进行原位分析。使用扫描电子显微镜和三维白光干涉表面形貌仪观察经不同溶液侵蚀的C₃A颗粒表面形态。结果表明：环糊精能够促进C₃A的初始反应，将C₃A发生二次水化开始时间提前。随着环糊精掺量的增加，C₃A和石膏在水化第一阶段的消耗量持续增长，石膏耗尽的时间也逐步前移。在C₃A的二次水化阶段，环糊精可降低其反应速率，延长反应持续时间，放热量基本不变。环糊精的存在能够促进C₃A在硫酸钙溶液中溶解，在C₃A颗粒表面生成更多更深的蚀坑，加速C₃A的水化反应。此外，环糊精的存在可使生成的钙矾石的形貌由针状向粗棒状转变，同时会抑制钙矾石向AFm的转变。

关键词

环糊精 / 铝酸三钙 / 二次水化 / 水化产物 / 水化热

Abstract

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Introduction

The hydration of binder is an exothermic reaction, which results in an obvious temperature increase in concrete in the early hydration period. The shrinkage of hardened concrete due to the temperature drop is a main cracking trigger of concrete. A kind of temperature rising inhibitor is developed to decrease the hydration heat of binder in early hydration age, which can reduce the cracking risk of concrete. Cyclodextrin is a main functional composition of the temperature rising inhibitor. C₃A is an important clinker mineral influencing the early exothermal characteristics of Portland cement. In this paper, the effect of cyclodextrin on the hydration of tricalcium aluminate-gypsum (C₃A-CaSO₄·2H₂O) was investigated. This work could favor understanding the action mechanism of the temperature rising inhibitor to reduce the cracking risk of concrete structures.

Methods

Pure C₃A was calcined, the chemical pure gypsum and cyclodextrin was used. The hydration exothermal curves of C₃A-CaSO₄·2H₂O pastes containing different dosages of cyclodextrin were measured. The hydration products of C₃A-CaSO₄·2H₂O pastes containing different dosages of cyclodextrin in different ages were in-situ determined by quantitative X-ray diffraction (QXRD). The morphology of hydration products on the surface of C₃A particles immersed in different solutions was characterized by scanning electron microscopy (SEM). The etching situation on the surface of C₃A particles washed by different solutions was determined by three-dimensional white light interferometric surface profilometry.

Results and discussion

The beginning time of second hydration of C₃A moves up and its exothermic rate decreases, but its reacting time prolongs with the increase of cyclodextrin dosage. The heat output of C₃A during its second hydration stage varies little. The consumption of C₃A and CaSO₄·2H₂O increases continuously and the exhausting time of gypsum reduces with the increase of cyclodextrin dosage. The forming quantity of ettringate in the paste containing cyclodextrin is greater than that in controlling paste. The transformation of ettringate to AFm is suppressed after the exhaust of gypsum. Cyclodextrin can expedite the dissolution of C₃A in CaSO₄ solution to form more deeper etch pits on the surface of C₃A particles, which speeds up the hydration of C₃A. Needle-like ettringite changes to stick-like one, and the transformation of ettringite to AFm restrains when cyclodextrin exists in pastes.

Conclusions

Cyclodextrin could promote the initial hydration of C₃A to move up the beginning of the second hydration of C₃A. The consumption of C₃A and CaSO₄·2H₂O increased continuously in the first hydration stage and the exhausting time of gypsum reduced with the increase of cyclodextrin dosage. Cyclodextrin reduced the reaction speed and prolonged reacting time of C₃A during its second hydration stage, its heat output changed little. Cyclodextrin could enhance the dissolution of C₃A in gypsum solution to form more deep etch pits on the surface of C₃A particles, speeding up the hydration of C₃A. Cyclodextrin could change needle-like ettringate to stick-like one and suppress the transformation of ettringate to AFm.

Key words

cyclodextrin / tricalcium aluminate / second hydration / hydration product / hydration heat

引用本文

阎培渝, 陈炜一. 环糊精对铝酸三钙-石膏体系水化过程的影响. 硅酸盐学报, 2026 , 54 (4) : 1419 -1425 . DOI: 10.14062/j.issn.0454-5648.20250504

Peiyu YAN, Weiyi CHEN. Effect of Cyclodextrin on Hydration of Tricalcium Aluminate-Gypsum[J]. Journal of the Chinese Ceramic Society, 2026 , 54 (4) : 1419 -1425 . DOI: 10.14062/j.issn.0454-5648.20250504

基金

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国家自然科学基金项目(51878381)

参考文献

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2026年第54卷第4期

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文章信息

doi: 10.14062/j.issn.0454-5648.20250504

接收时间：2025-06-25
首发时间：2026-05-20
出版时间：2026-01-29

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收稿日期：2025-06-25
修回日期：2025-08-10

基金

国家自然科学基金项目(51878381)

作者信息

清华大学土木工程系，北京 100084

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https://castjournals.cast.org.cn/joweb/gsyxb/CN/10.14062/j.issn.0454-5648.20250504

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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