改性硅藻土对水泥基调湿材料性能的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (1): 180-186.

所属专题：资源综合利用

改性硅藻土对水泥基调湿材料性能的影响

冯蕾^1,2, 楼岱³, 冉泽¹, 温小栋^1,2, 王伟⁴

1.宁波工程学院建筑与交通工程学院,宁波 315211;
2.浙江省土木工程工业化建造工程技术研究中心,宁波 315211;
3.宏润建设集团股份有限公司,宁波 315000;
4.厦门天润锦龙建材有限公司,厦门 361027

收稿日期:2020-08-04 修回日期:2020-10-24 出版日期:2021-01-15 发布日期:2021-02-07
通讯作者: 温小栋,博士,教授。E-mail:wenxiaodong8@163.com
作者简介:冯蕾(1980—),女,博士,讲师。主要从事绿色建筑材料方面的研究。E-mail:42623362@qq.com
基金资助:
国家自然科学基金(51569035);宁波市科技局社会发展重大重点工程项目(2013C51004,2017C510007);浙江省新苗人才计划项目(2019R428006)

Influence of Modified Diatomite on Cement-Based Humidity ControlMaterials Performance

FENG Lei^1,2, LOU Dai³, RAN Ze¹, WEN Xiaodong^1,2, WANG Wei⁴

1. School of Civil and Transportation Engineering,Ningbo University of Technology,Ningbo 315211,China;
2. Zhejiang EngineeringTechnology Research Center of Civil Engineering Industrialized Construction,Ningbo 315211,China;
3. Hongrun Construction GroupCo.,Ltd.,Ningbo 315000,China;
4. Xiamen Tianrun Jinlong Building Materials Co.,Ltd.,Xiamen 361027,China

Received:2020-08-04 Revised:2020-10-24 Online:2021-01-15 Published:2021-02-07

摘要/Abstract

摘要： 利用煅烧和酸浸对天然硅藻土进行改性,并取代部分胶凝材料制备出水泥基调湿材料。通过对比研究了改性前后硅藻土及其掺量对水泥基调湿材料的工作性能、力学性能及吸放湿速率的影响,并结合硅藻土改性前后的化学成分与表面结构变化规律,以及水泥硬化体孔结构特征参数,分析改性硅藻土的作用机理。结果表明:改性硅藻土水泥基调湿材料的力学性能与调湿性均好于同掺量天然硅藻土的试样;天然硅藻土经过400 ℃煅烧2 h和浓度50%(质量分数)H₂SO₄溶液酸浸12 h后,其SiO₂含量增加,比表面积、平均孔径及总孔容显著提高,也进一步增大了硬化体孔隙率与孔径,增强了对空气水分子的表面吸附与毛细孔道效应。

关键词: 硅藻土, 煅烧, 酸浸, 水泥基调湿材料, 作用机理

Abstract: The natural diatomite was modified by calcination and acid pickling,and then was used to replace some cementitious materials for preparing cement-based humidity control materials.The workability,mechanical properties,moisture absorption and desorption rates of cement-based humidity control materials mixed with natural diatomite was tested and compared with those of the modified diatomite.Based on that,the function mechanism of modified diatomite was investigated comprehensively through characteristics analysis of chemical composition and surface structure of diatomite before and after modification,and characteristic parameters of cement hardened body pore structure.The results show that mechanical properties and humidity-controlling performance of cement-based humidity control materials with modified diatomite are better than those of the natural diatomite with the same dosage.When the diatomite is calcined at 400 ℃ for 2 h and pickled with 50% (mass fraction) H₂SO₄ solution for 12 h,its specific surface area,average pore size and total pore volume increase significantly,and further enhances surface adsorption and capillary channel effect of water in the air.

Key words: diatomite, calcination, acid pickling, cement-based humidity control material, action mechanism

中图分类号:

TU59

冯蕾, 楼岱, 冉泽, 温小栋, 王伟. 改性硅藻土对水泥基调湿材料性能的影响[J]. 硅酸盐通报, 2021, 40(1): 180-186.

FENG Lei, LOU Dai, RAN Ze, WEN Xiaodong, WANG Wei. Influence of Modified Diatomite on Cement-Based Humidity ControlMaterials Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 180-186.

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改性硅藻土对水泥基调湿材料性能的影响

Influence of Modified Diatomite on Cement-Based Humidity ControlMaterials Performance

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