预吸水空心玻璃微珠的内养护作用研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (8): 2905-2911.

预吸水空心玻璃微珠的内养护作用研究

渠亚男

中国铁道科学研究院集团有限公司铁道建筑研究所,北京 100081

收稿日期:2023-12-12 修订日期:2024-01-19 出版日期:2024-08-15 发布日期:2024-08-12
作者简介:渠亚男(1987—),女,博士,副研究员。主要从事铁路工程材料和建筑材料的研究。E-mail:quyanan2016@163.com
基金资助:
国家自然科学基金(51908551);皖赣铁路安徽有限责任公司科技研究开发计划(池黄2028-00-2020号)

Internal Curing Effect of Water-Saturated Hollow Glass Microspheres

QU Yanan

Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China

Received:2023-12-12 Revised:2024-01-19 Online:2024-08-15 Published:2024-08-12

摘要/Abstract

摘要： 本文采用预吸水空心玻璃微珠制备内养护砂浆,研究了预吸水空心玻璃微珠的释水特性及减缩效果,探明了内养护水在水泥水化进程中的作用,阐明了预吸水空心玻璃微珠的内养护作用机制。结果表明,空心玻璃微珠表面开孔孔径尺寸为1~20 μm。在相对湿度为97.5%的环境中,预吸水空心玻璃微珠的释水百分比大于95%。将预吸水空心玻璃微珠引入内养护水后,随着内养护水胶比增加,内养护砂浆的自收缩逐渐减小。内养护水可以提高水泥浆体内部的相对湿度和水泥的水化程度,显著延长水泥浆体的湿度饱和期,从而减小混凝土/砂浆的早期自收缩。

关键词: 空心玻璃微珠, 内养护, 自收缩, 湿度饱和期, 水化进程

Abstract: The internal curing mortar was prepared by water-saturated hollow glass microspheres in this paper. The water release characteristics and shrinkage retardation effects of water-saturated hollow glass microspheres were studied. The role of internal curing water in cement hydration process was investigated, and the internal curing mechanism of water-saturated hollow glass microspheres was illustrated. The results show that the pore size on the surface of hollow glass microspheres is 1~20 μm. When the relative humidity is 97.5%, the water release percentage of water-saturated hollow glass microspheres is greater than 95%. When the internal curing water is introduced through water-saturated hollow glass microspheres, autogenous shrinkage of internal curing mortar decreases gradually with the increase of internal curing water-binder ratio. The internal curing water can improve the relative humidity inside cement paste and the hydration degree of cement, and significantly extend the humidity saturation period of cement paste, so as to reduce the early autogenous shrinkage of concrete or mortar.

Key words: hollow glass microsphere, internal curing, autogenous shrinkage, humidity saturation period, hydration process

中图分类号:

TU528.31

渠亚男. 预吸水空心玻璃微珠的内养护作用研究[J]. 硅酸盐通报, 2024, 43(8): 2905-2911.

QU Yanan. Internal Curing Effect of Water-Saturated Hollow Glass Microspheres[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2905-2911.

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