掺氢氧化钙对超高强混凝土力学性能影响的机理

doi:10.11896/cldb.22060068

材料导报

2024, Vol. 38

Issue (3): 22060068-6 https://doi.org/10.11896/cldb.22060068

无机非金属及其复合材料

掺氢氧化钙对超高强混凝土力学性能影响的机理

朋改非^1,*, 张贵¹, 左雪宇^1,2, 丁宏^3,4, 陈喜旺³, 王海迪⁴, 刘新建⁴

1 北京交通大学土木建筑工程学院,北京 100044
2 中建三局集团北京有限公司,北京 100162
3 北京建工新型建材有限责任公司,北京 100015
4 北京建工恒均工程检测有限公司,北京 102615

Mechanism for the Influence of Added Hydrated Lime on Mechanical Properties of Ultra-high Strength Concrete

PENG Gaifei^1,*, ZHANG Gui¹, ZUO Xueyu^1,2, DING Hong^3,4, CHEN Xiwang³, WANG Haidi⁴, LIU Xinjian⁴

1 Faculty of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2 China Construction Third Bureau Group Beijing Limited Liability Company, Beijing 100162, China
3 Beijing Construction Engineering Group, Advanced Construction Materials Limited Liability Company, Beijing 100015, China
4 Beijing Construction Engineering Group, Hengjun Engineering Detection Limited Liability Company, Beijing 102615, China

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摘要鉴于含矿物掺合料较多的超高性能混凝土(Ultra-high performance concrete,UHPC)中火山灰反应所需氢氧化钙含量不足的状况,在配制超高强混凝土(UHPC基体)时掺加氢氧化钙,研究其对超高强混凝土力学性能的影响机理。结果表明,超高强混凝土力学性能的改善源于掺入的氢氧化钙与矿物掺合料中的SiO₂发生火山灰反应生成C-S-H及C-A-S-H凝胶,且在组合养护(90 ℃热水养护2 d+250 ℃干热养护3 d)下,部分C-(A)-S-H凝胶向托勃莫来石与硬硅钙石晶体转变,改善了超高强混凝土的微观结构。

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	刘新建

关键词: 超高强混凝土氢氧化钙力学性能机理

Abstract: Based on the drawback of insufficient calcium hydroxide content required for pozzolanic reaction in ultra-high performance concrete (UHPC) incorporating high volume mineral admixtures, hydrated lime was intentionally added into the ultra-high strength concrete (matrix of UHPC) to investigate its influence on the mechanical properties of ultra-high strength concrete. The mechanism for the improvement in mechanical properties of ultra-high strength concrete should be pozzolanic reaction between hydrated lime and mineral admixtures, which formed C-S-H and C-A-S-H gels. Partial C-(A)-S-H gels were transformed into tobermorite and xonotlite crystals under combined curing (90 ℃ hot water curing for 2 d and 250 ℃ dry air heating for 3 d), which improved both the microstructure and mechanical properties of ultra-high strength concrete.

Key words: ultra-high strength concrete hydrated lime mechanical property mechanism

出版日期: 2024-02-10 发布日期: 2024-02-19

ZTFLH:

TU528

基金资助: 国家自然科学基金(51878032);北京市自然科学基金(8212013;8172036)

通讯作者: *朋改非,北京交通大学土木建筑工程学院教授、博士研究生导师。1987年同济大学材料科学与工程系本科毕业,1992年清华大学材料科学与工程系硕士毕业,1999年香港理工大学土木与结构工程系博士毕业。目前主要从事超高性能混凝土、高性能混凝土、再生混凝土等方面的研究工作。在Cement and Concrete Research、Cement and Concrete Composites、Construction and Building Mate-rials、《硅酸盐学报》等期刊发表论文100余篇。gfpeng@bjtu.edu.cn

引用本文:

朋改非, 张贵, 左雪宇, 丁宏, 陈喜旺, 王海迪, 刘新建. 掺氢氧化钙对超高强混凝土力学性能影响的机理[J]. 材料导报, 2024, 38(3): 22060068-6.
PENG Gaifei, ZHANG Gui, ZUO Xueyu, DING Hong, CHEN Xiwang, WANG Haidi, LIU Xinjian. Mechanism for the Influence of Added Hydrated Lime on Mechanical Properties of Ultra-high Strength Concrete. Materials Reports, 2024, 38(3): 22060068-6.

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