材料与可持续发展(四)一材料再制造与废弃物料资源化利用*
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地质聚合物凝结硬化及其调节技术的研究进展
王爱国1 , 王星尧1 , 孙道胜1,* , 朱颖灿2 , 刘开伟1 , 经验1 , 管艳梅1
1 安徽建筑大学,安徽省先进建筑材料重点实验室,合肥 230022
Research Progress on Setting and Hardening of Geopolymers and Their Control
WANG Aiguo1 , WANG Xingyao1 , SUN Daosheng1,* , ZHU Yingcan2 , LIU Kaiwei1 , JING Yan1 , GUAN Yanmei1
1 Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China
摘要 澳大利亚地质聚合物(Geopolymer)是一类由活性铝硅酸盐矿物在碱激发作用下形成的非传统胶凝材料,具有高强、耐久、绿色环保等特点。但地质聚合物原材料和碱性激发剂的多样性使其水化机理异常复杂,凝结硬化性质不确定性增加,且受环境温度变化影响大。因原材料及制备工艺不同,地质聚合物凝结硬化特性可能走向两个极端:(1)凝结硬化过快,难以施工;(2)长时间不凝结硬化,早期强度发展慢。通过合理有效的方法将其凝结时间调控至适合范围,是实际工程应用中亟需解决的关键问题。本文分别阐述了高钙、低钙和无钙体系下地质聚合物的凝结硬化机理,详细分析了铝硅酸盐原料细度、活性及CaO含量,激发剂的类型、掺量以及环境温度等因素对地质聚合物凝结时间的影响,概括总结了调节地质聚合物凝结时间的技术方法,并分析了其作用机理,以期为地质聚合物的应用研究提供技术支持。
关键词:
地质聚合物
凝结时间
凝结硬化机理
调节技术
Abstract: Geopolymers are a family of non-traditional cementitious materials formed by alkali-activation of reactive aluminosilicate minerals, which have the characteristics of high strength, good durability, green and environmental friendly. However, the diversity of raw materials and alkaline activators bring about the complexity of hydration (activation) mechanisms, and lead to the uncertainty of setting and hardening process. In addition, the change of temperature during manufacturing also has a great impact. Depending on the raw materials and preparation conditions, the setting and hardening of geopolymers may go to two extremes: on one hand, too rapid setting and accelerated hardening to work with, on the other hand, too slow to gain early strength. Therefore, control the setting time of geopolymers within a reasonable range is one of the key issues that address the problems of application. Based on the calcium-rich, low-calcium, calcium-free categories of geopolymer systems, this article clarified the setting and hardening mechanism of geopolymers, analyzed the influence of fineness, activity and CaO content of aluminosilicate materials, types and dosage of alkaline activators, as well as temperature on the setting time of geopolymers. It summarized the technical methods to regulate the setting time of geopolymers and analyzed its mechanism. It is expected to provide technical support for the application research of geopolymers.
Key words:
geopolymer
setting time
setting and hardening mechanism
regulating technology
出版日期: 2021-07-10
发布日期: 2021-07-14
基金资助: 国家自然科学基金(51778003);安徽省重点研究与开发计划项目(202004611020033);安徽省教育厅自然科学基金(KJ2019JD16)
作者简介: 王爱国,安徽建筑大学,教授,硕士研究生导师。2010年毕业于南京工业大学,获材料学博士学位。2017年于澳大利亚University of Southern Queensland, Centre for Future Materials作访问学者。主持国家自然科学基金项目、安徽省高校自然科学研究重点研究项目、高性能土木工程材料国家重点实验室开放课题和材料化学工程国家重点实验室开放课题等省部级以上项目10余项。 Construction and Building Mate-rials 、 Cement and Concrete Composites 、《材料导报》和《硅酸盐通报》等学术期刊审稿人,中国建筑学会建筑材料分会理事。主要研究方向为高性能水泥基材料/建筑功能材料/固体废弃物综合利用。
引用本文:
王爱国, 王星尧, 孙道胜, 朱颖灿, 刘开伟, 经验, 管艳梅. 地质聚合物凝结硬化及其调节技术的研究进展[J]. 材料导报, 2021, 35(13): 13001-13010.
链接本文:
http://www.mater-rep.com/CN/10.11896/cldb.20090088
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http://www.mater-rep.com/CN/Y2021/V35/I13/13001
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2021, Vol. 35 
