外加剂对碱激发胶凝材料干燥收缩性能的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (8): 2788-2796.

外加剂对碱激发胶凝材料干燥收缩性能的影响

范小春^1,2, 杨东升¹, 张宇³, 高旭^1,2, 喻立举⁴

1.武汉理工大学土木工程与建筑学院,武汉 430070;
2.武汉理工大学三亚科教创新园,三亚 572000;
3.中建三局集团有限公司,武汉 430074;
4.中水华创国际工程设计顾问有限公司,西安 710000

收稿日期:2023-12-05 修订日期:2024-01-15 出版日期:2024-08-15 发布日期:2024-08-12
通信作者: 杨东升,硕士研究生。E-mail:334261@whut.edu.cn
作者简介:范小春(1975—),男,教授。主要从事新型混凝土材料与结构方面的研究。E-mail:fxcfree@126.com
基金资助:
国家自然科学基金面上项目(41972271);海南省重大科技计划(ZDKJ2021024);武汉理工大学三亚科教创新园开放基金(2021KF0001)

Influences of Additives on Alkali-Activated Cementitious Materials Drying Shrinkage Performance

FAN Xiaochun^1,2, YANG Dongsheng¹, ZHANG Yu³, GAO Xu^1,2, YU Liju⁴

1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;
2. Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572000, China;
3. China Construction Third Engineering Bureau Group Co., Ltd, Wuhan 430074, China;
4. Zhongshui Huachuang International Engineering Design Consulting Co., Ltd, Xi’an 710000, China

Received:2023-12-05 Revised:2024-01-15 Online:2024-08-15 Published:2024-08-12

摘要/Abstract

摘要： 为了进一步改善碱激发胶凝材料的收缩特性,探索了单掺有机减缩剂(聚乙二醇和乳胶)、无机膨胀剂(CaO、MgO和石膏)对矿渣粉煤灰复合碱激发(AASF)体系水化产物组成、孔隙结构和收缩特性的影响。结果表明,在所有的外加剂中,聚乙二醇减缩效果最显著,外掺1%(质量分数)聚乙二醇的AASF试样的91 d干燥收缩仅为1 683 με,相较于对照组最大降低29.7%,这主要归因于孔隙结构的显著粗化。聚乙二醇和乳胶对AASF的抗压强度有一定的负面影响,主要源于水化反应程度的降低和整体孔隙率的增加。三种无机膨胀剂在AASF体系中发挥出的收缩补偿效果不强,但对抗折强度有显著的增益效果。

关键词: 外加剂, 胶凝材料, 碱激发, 干燥收缩, 物相组成, 孔隙结构

Abstract: In order to further improve the shrinkage characteristics of alkali-activated cementitious materials, the effects of single-doped organic shrinkage reducing agents (polyethylene glycol and latex) and inorganic expansion agents (CaO, MgO and gypsum) on hydration products composition, pore structure and shrinkage characteristics of alkali-activated slag fly ash (AASF) system were explored. The results show that among all the additives, polyethylene glycol has the most significant shrinkage reduction effect. The 91 d drying shrinkage of AASF samples with 1% (mass fraction) polyethylene glycol is only 1 683 με, which is 29.7% lower than that of control group, mainly due to the significant coarsening of pore structure. Polyethylene glycol and latex have a certain negative impact on the compressive strength of AASF, mainly due to the decrease of hydration reaction and the increase of overall porosity. The shrinkage compensation effect of three expansion agents in AASF system is not strong, but there is a significant increase in flexural strength.

Key words: additive, cementitious material, alkali-activation, drying shrinkage, phase composition, pore structure

中图分类号:

TQ172

范小春, 杨东升, 张宇, 高旭, 喻立举. 外加剂对碱激发胶凝材料干燥收缩性能的影响[J]. 硅酸盐通报, 2024, 43(8): 2788-2796.

FAN Xiaochun, YANG Dongsheng, ZHANG Yu, GAO Xu, YU Liju. Influences of Additives on Alkali-Activated Cementitious Materials Drying Shrinkage Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2788-2796.

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