Na2SiO3/Na2CO3复合制备清洁型碱矿渣胶凝材料

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (1): 235-240.

所属专题：资源综合利用

Na₂SiO₃/Na₂CO₃复合制备清洁型碱矿渣胶凝材料

张立恒, 陈佩圆, 谭伟博, 王永辉

安徽理工大学土木建筑学院,淮南 232001

收稿日期:2021-09-01 修订日期:2021-09-21 出版日期:2022-01-15 发布日期:2022-02-10
通信作者: 陈佩圆,博士,副教授。E-mail:peiyuan29@126.com
作者简介:张立恒(1998—),男,硕士研究生。主要从事绿色胶凝材料、固废资源化利用等方面的研究。E-mail:zlh323@163.com
基金资助:
国家自然科学基金(52008003);安徽理工大学研究生创新基金(2020CX2019);芜湖市科技计划项目(ALW2020YF16);安徽省高等学校自然科学研究重大项目(KJ2020ZD33)

Preparation of Clean Alkali-Activated Slag Cementitious Material by Combined Activator of Na₂SiO₃/Na₂CO₃

ZHANG Liheng, CHEN Peiyuan, TAN Weibo, WANG Yonghui

School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China

Received:2021-09-01 Revised:2021-09-21 Online:2022-01-15 Published:2022-02-10

摘要/Abstract

摘要： 为解决弱碱单独激发碱矿渣胶凝材料(AASM)时存在的力学性能弱、矿渣反应程度低等问题,缓解AASM的操作危害性,本文采用Na₂SiO₃/Na₂CO₃复合激发矿渣,研究了复合激发剂组成对AASM凝结时间、抗压强度、水化产物及自收缩的影响,并评估了AASM的环境效益。结果表明:随着Na₂CO₃碱当量的增加,AASM缓凝效果较为明显,抗压强度也有所降低,但抗压强度的降低幅度随龄期增大而减小。通过加入Na₂CO₃,AASM水化产物种类增多,C-(A)-S-H的峰值强度随Na₂CO₃碱当量占比的增加呈现出先增加后降低的趋势,因而解释了AASM浆体自收缩的变化。另外,由CO₂排放指数可以看出,Na₂SiO₃/Na₂CO₃复合激发矿渣较Na₂SiO₃单独激发更为清洁,环境效益显著。

关键词: 碱激发矿渣, 复合激发剂, Na₂CO₃, 水化产物, 自收缩, CO₂排放指数

Abstract: This study is aimed to solve the problems of weak mechanical properties and low degree of slag reaction when weak single alkali-activated slag cementitious material (AASM), and to alleviate the operational hazards of AASM. Therefore, a combined activator of Na₂SiO₃/Na₂CO₃ was used to investigate its influence on the setting time, compressive strength, hydration products and autogenous shrinkage of AASM. Moreover, the environmental benefit of AASM was assessed. The experimental results show that the retarding effect is significant and the compressive strength is reduced with the increase of Na₂CO₃ alkali dosage, whereas the reduction rate of compressive strength is slightly decreased as the hydration time increased. More types of hydration products are produced by adding Na₂CO₃. The amount of C-(A)-S-H increased first follow by a decrease with the increase of Na₂CO₃ alkali dosage, thus explaining the changes in the autogenous shrinkage. Furthermore, based on the CO₂ emission index, the combined Na₂SiO₃/Na₂CO₃ activated slag is produced in a cleaner manner with greater environmental benefit, compare to the Na₂SiO₃ activated slag.

Key words: alkali-activated slag, combined activator, Na₂CO₃, hydration product, autogenous shrinkage, CO₂ emission index

中图分类号:

TU528

张立恒, 陈佩圆, 谭伟博, 王永辉. Na₂SiO₃/Na₂CO₃复合制备清洁型碱矿渣胶凝材料[J]. 硅酸盐通报, 2022, 41(1): 235-240.

ZHANG Liheng, CHEN Peiyuan, TAN Weibo, WANG Yonghui. Preparation of Clean Alkali-Activated Slag Cementitious Material by Combined Activator of Na₂SiO₃/Na₂CO₃[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(1): 235-240.

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Na₂SiO₃/Na₂CO₃复合制备清洁型碱矿渣胶凝材料

Preparation of Clean Alkali-Activated Slag Cementitious Material by Combined Activator of Na₂SiO₃/Na₂CO₃

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