养护温度对凝灰岩基胶凝材料力学性能的影响机理

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (9): 3148-3153.

养护温度对凝灰岩基胶凝材料力学性能的影响机理

张平, 马旭东, 韩世界, 古龙龙, 王章彦

中建西部建设新疆有限公司,乌鲁木齐 830000

收稿日期:2022-05-11 修回日期:2022-06-29 出版日期:2022-09-15 发布日期:2022-09-27
通讯作者: 马旭东,助理工程师。E-mail:1436981305@qq.com
作者简介:张平(1979—),男,高级工程师。主要从事高性能混凝土的研究。E-mail:3411717787@qq.com

Effect Mechanism of Curing Temperature on Mechanical Properties of Tuff-Based Cementitious Materials

ZHANG Ping, MA Xudong, HAN Shijie, GU Longlong, WANG Zhangyan

China Construction Western Construction Xinjiang Co., Ltd., Urumqi 830000, China

Received:2022-05-11 Revised:2022-06-29 Online:2022-09-15 Published:2022-09-27

摘要/Abstract

摘要： 凝灰岩是经过火山喷出散落在地面,经过压结和水化胶结固化而形成的一种火山灰碎屑岩,具有一定的火山灰活性。本文研究养护温度对凝灰岩基胶凝材料力学性能的影响,并借助FTIR、TG、SEM和MIP等对凝灰岩基胶凝材料水化产物的微观结构进行分析。结果表明,提高养护温度对凝灰岩基胶凝材料的力学性能具有一定的增强作用,提高养护温度不仅能提高早期强度,还可以提高后期强度,凝灰岩基胶凝材料的最佳养护温度为50 ℃。提高养护温度后凝灰岩基胶凝材料中没有生成新的水化产物,AFt和C-S-H等水化产物含量增加,Ca(OH)₂的含量减少。提高养护温度有利于增加凝胶孔和过渡孔占比,细化孔径结构,降低孔隙率,提高基体结构的致密度。

关键词: 胶凝材料, 凝灰岩, 力学性能, 火山灰活性, 养护温度, 孔结构

Abstract: Tuff is a kind of volcanic ash clastic rock which is scattered on the ground through volcanic eruption and solidified through compaction and hydration cementation, and it has certain pozzolanic activity. In this paper, the effect of curing temperature on the mechanical properties of tuff-based cementitious materials was studied, and the microstructure of hydration products of tuff-based cementitious materials was analyzed by means of FTIR, TG, SEM and MIP. The results show that the increase of curing temperature has a certain promotion and enhancement effect on the mechanical properties of tuff-based cementitious materials, which can not only improve the early strength, but also improve the later strength. The optimal curing temperature of tuff-based cementitious materials is 50 ℃. With the increase of curing temperature, no new hydration products are formed in the tuff-based cementitious material, but the content of hydration products such as AFt and C-S-H increases, and the content of Ca(OH)₂ decreases. The increase of curing temperature is beneficial to increase the proportion of gel pores and transition pores in the tuff-based cementitious material, refine the pore size structure, reduce the porosity, and improve the density of matrix structure.

Key words: cementitious material, tuff, mechanical property, pozzolanic activity, curing temperature, pore structure

中图分类号:

TU526

张平, 马旭东, 韩世界, 古龙龙, 王章彦. 养护温度对凝灰岩基胶凝材料力学性能的影响机理[J]. 硅酸盐通报, 2022, 41(9): 3148-3153.

ZHANG Ping, MA Xudong, HAN Shijie, GU Longlong, WANG Zhangyan. Effect Mechanism of Curing Temperature on Mechanical Properties of Tuff-Based Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(9): 3148-3153.

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