CO2养护煤矸石粗骨料性能研究

doi:10.11896/cldb.23030104

材料导报

2024, Vol. 38

Issue (14): 23030104-8 https://doi.org/10.11896/cldb.23030104

无机非金属及其复合材料

CO₂养护煤矸石粗骨料性能研究

曹梦媛¹, 于素慧², 袁健², 王炜², 张少辉^1,3, 王艳^1,3,*

1 西安建筑科技大学材料科学与工程学院,西安 710055
2 火箭军工程大学作战保障学院,西安 710025
3 西安建筑科技大学土木工程学院,西安 710055

Research on Properties of Coal Gangue Coarse Aggregate Cured by CO₂

CAO Mengyuan¹, YU Suhui², YUAN Jian², WANG Wei², ZHANG Shaohui^1,3, WANG Yan^1,3,*

1 School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2 School of Academy of Combat Support, Rocket Force University of Engineering, Xi'an 710025, China
3 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

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摘要煤矸石粗骨料存在压碎指标高、吸水率大以及与混凝土基体界面粘结差等缺点,限制了其在土木工程的应用,因此,改善煤矸石各方面性能是提高其应用率的前提。CO₂养护是利用CO₂与水泥水化产物Ca(OH)₂发生反应来改善水泥浆体的结构,可降低能耗、改善骨料的性能。本工作研究了养护温度(20 ℃/40 ℃)、CO₂浓度(65%/95%)和养护时间(2 h/4 h/6 h)对水泥基材料包裹的煤矸石粗骨料和水泥+环氧树脂材料包裹的煤矸石粗骨料的表观密度、吸水率、压碎指标和坚固性的影响,对其化学成分和界面过渡区形貌进行了分析,并对CO₂养护后的煤矸石粗骨料进行固碳率测定。CO₂养护在骨料表面形成了一层强度较高的外壳,骨料性能得到改善,升高养护温度、增大CO₂浓度和延长养护时间,骨料表观密度可提升0.04%~3.24%,吸水率可降低6.51%~14.29%,煤矸石骨料的压碎指标和坚固性指数可从Ⅱ级提升到Ⅰ级骨料标准。经CO₂养护后,煤矸石骨料的固碳率最高可达20.07%,在提高骨料性能的同时降低了CO₂排放量。不同材料包裹的煤矸石骨料中,水泥包裹层中Ca(OH)₂含量较高,经CO₂养护后界面粘结紧密,微观形貌也更加致密,提升效果最为显著,水泥+5%硅灰次之,水泥+10%粉煤灰和水泥+环氧树脂提升较差。

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关键词: 煤矸石 CO₂养护压碎指标坚固性界面过渡区固碳率

Abstract: The disadvantage of coal gangue coarse aggregate (CGCA) such as high crushing index, high water absorption and poor interface adhesion with concrete matrix limit its application in civil engineering.Improving the performance of CGCA is the premise of increasing its application rate. CO₂ curing is to improve the structure of cement paste by the reaction of CO₂ with cement hydration product Ca(OH)₂, which can reduce energy consumption and improve the properties of aggregate. In this work, the effects of curing temperature (20°C/40°C), CO₂ concentration (65%/95%) and curing time (2 h/4 h/6 h) on the apparent density, water absorption, crushing index and firmness of CGCA wrapped by cement-based materials and cement + epoxy resin materials were studied. And the chemical composition and interface transition zone morphology were analyzed. Moreover, the carbon fixation rate of CGCA after CO₂ curing was measured. A high strength shell is formed on the surface of the wrapped CGCA by CO₂ curing, and the CGCA performance is improved. Increasing the curing temperature, CO₂ concentration and curing time, the apparent density can be increased by 0.04%—3.24%, and the water absorption can be reduced by 6.51%—14.29%. The crushing index and firmness index of wrapped CGCA can be improved from grade II to grade I aggregate standard. After CO₂ curing, the carbon fixation rate can reach up to 20.07%, which improves the aggregate performance and reduces the CO₂ emission. Due to the high content of Ca(OH)₂ in the cement wrapped layer, the interface is tightly bonded after CO₂ curing, and the microstructure is more compact. Therefore, the improvement effect of cement wrapping is the most significant. As a comparison, the improvement effect of cement + 5% silica fume is weak, and the improvement of cement + 10% fly ash and cement + epoxy resin is the worst.

Key words: coal gangue,CO₂ curing,crushing index,firmness index,interfacial transition zone CO₂ uptake ratio

出版日期: 2024-07-25 发布日期: 2024-08-12

ZTFLH:

TU528

基金资助: 国家优秀青年科学基金(52222806);国家自然科学基金面上项目(52078414);陕西省杰出青年科学基金(2022JC-20);陕西省教育厅科学研究计划重点项目(20JY037);洞库混凝土被复结构盐蚀作用机理与性能提升关键技术应用研究(No.5);西安建筑科技大学优秀博士学位论文培育基金 (2021XYBPY004)

通讯作者: * 王艳,西安建筑科技大学教授、博士研究生导师。2020年入选陕西省“特支计划”青年拔尖人才,2021年获陕西省杰出青年科学基金,2022年获国家优秀青年科学基金,教育部“现代混凝土结构安全性与耐久性”创新团队核心成员。主要从事隧道与地下工程结构耐久性领域的研究工作,包括一般地质环境混凝土衬砌耐久性、高地热环境混凝土衬砌耐久性、隧道衬砌损伤的智能感知技术等。主持国家自然科学基金项目4项、省部级基金项目5项,发表学术论文60余篇。wangyanwjx@126.com

作者简介: 曹梦媛,2019年于西安建筑科技大学获得工学学士学位,现为西安建筑科技大学材料科学与工程学院硕士研究生,在王艳教授的指导下进行研究。

引用本文:

曹梦媛, 于素慧, 袁健, 王炜, 张少辉, 王艳. CO₂养护煤矸石粗骨料性能研究[J]. 材料导报, 2024, 38(14): 23030104-8.
CAO Mengyuan, YU Suhui, YUAN Jian, WANG Wei, ZHANG Shaohui, WANG Yan. Research on Properties of Coal Gangue Coarse Aggregate Cured by CO₂. Materials Reports, 2024, 38(14): 23030104-8.

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http://www.mater-rep.com/CN/10.11896/cldb.23030104 或 http://www.mater-rep.com/CN/Y2024/V38/I14/23030104

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