养护制度对重晶石防辐射混凝土强度的影响机理研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (11): 3996-4003.

养护制度对重晶石防辐射混凝土强度的影响机理研究

司鹏超^1,2, 薛凯喜^1,2, 周子勤^1,2, 王升福^1,2, 胡艳香^1,2, 欧阳志辉³

1.东华理工大学土木与建筑工程学院,南昌 330013;
2.江西省地质环境与地下空间工程研究中心,南昌 330013;
3.江西建博混凝土有限公司,南昌 330006

收稿日期:2024-06-13 修订日期:2024-08-02 出版日期:2024-11-15 发布日期:2024-11-21
通信作者: 薛凯喜,博士,教授。E-mail:xkx1257@foxmail.com
作者简介:司鹏超(2000—),男,硕士研究生。主要从事土木工程材料的研究。E-mail:786104428@qq.com
基金资助:
国家自然科学基金(42167024);核技术应用教育部工程研究中心资助项目(HJSJYB2022-5)

Influence Mechanism of Curing Regime on Strength of Barite Radiation Shielding Concrete

SI Pengchao^1,2, XUE Kaixi^1,2, ZHOU Ziqin^1,2, WANG Shengfu^1,2, HU Yanxiang^1,2, OUYANG Zhihui³

1. School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China;
2. Engineering Research Center for Geological Environment and Underground Space of Jiangxi Province, Nanchang 330013, China;
3. Jiangxi Jianbo Concrete Co., Ltd., Nanchang 330006, China

Received:2024-06-13 Revised:2024-08-02 Published:2024-11-15 Online:2024-11-21

摘要/Abstract

摘要： 为了进一步提高防辐射混凝土的强度,本文通过设置四种养护制度:标准养护、蒸汽养护、组合养护1(3 d蒸汽养护+25 d标准养护)和组合养护2(7 d蒸汽养护+21 d标准养护),研究不同养护制度下的重晶石防辐射混凝土的强度,并通过扫描电子显微镜(SEM)研究不同养护制度对防辐射混凝土水化产物、界面过渡区(ITZ)、纤维和钢丸的粘结性能。实验结果发现,蒸汽养护和组合养护相比于标准养护均提升了防辐射混凝土的强度,其中蒸汽养护的28 d抗压强度和劈裂抗拉强度相较于标准养护提升最大,分别提高了12.7%和9.5%,高温高湿的养护环境均会激发硅灰的火山灰活性,促进Ca(OH)₂参与二次水化生成蜂窝状的C-S-H凝胶,并形成针状或柱状的钙矾石(AFt),使微观结构更加致密;同时会提升防辐射混凝土内部ITZ的稳定性,减小缝隙;并且纤维和钢丸与基体粘结性能更优,抗拉拔效果更好,其中蒸汽养护效果更为明显。本文为防辐射混凝土的研究提供了新的参考。

关键词: 防辐射混凝土, 重晶石, 养护制度, 微观结构, 强度, 粘结性能

Abstract: In order to further improve the strength of radiation shielding concrete, this paper investigates the strength of barite radiation shielding concrete under different curing regimes by setting up four curing regimes: standard curing, steam curing, combined curing 1 (3 d steam curing +25 d standard curing) and combined curing 2 (7 d steam curing +21 d standard curing). The effects of different curing regimes on the radiation shielding concrete hydration products, interfacial transition zone (ITZ), fiber and steel shot bonding property were investigated by scanning electron microscope (SEM). The test results show that both steam curing and combined curing enhance the strength of radiation shielding concrete compared to standard curing, in which the 28 d compressive strength and splitting tensile strength of steam curing improve the most compared with standard curing, which increase 12.7% and 9.5%, respectively, and both high temperature and high humidity curing environments stimulate the volcanic ash activity of silica fume and promote Ca(OH)₂ to participate in the secondary hydration to generate honeycomb-like C-S-H gel, and the formation of needle-like or columnar calcium alumina (AFt), making the microstructure more dense; at the same time, it will enhance the stability of the internal ITZ of radiation shielding concrete and reduce the gaps; and the fibers and steel shot with the substrate bonding property is better, and better tensile and pull-out resistance, of which steam curing is more obvious. This paper provides a new reference for the research of radiation shielding concrete.

Key words: radiation shielding concrete, barite, curing regime, microstructure, strength, bonding property

中图分类号:

TU596

司鹏超, 薛凯喜, 周子勤, 王升福, 胡艳香, 欧阳志辉. 养护制度对重晶石防辐射混凝土强度的影响机理研究[J]. 硅酸盐通报, 2024, 43(11): 3996-4003.

SI Pengchao, XUE Kaixi, ZHOU Ziqin, WANG Shengfu, HU Yanxiang, OUYANG Zhihui. Influence Mechanism of Curing Regime on Strength of Barite Radiation Shielding Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 3996-4003.

参考文献

[1] 张高展, 吴明明, 杨军, 等. 低收缩防辐射超高性能混凝土的制备及其性能形成机理[J]. 硅酸盐学报, 2021, 49(11): 2405-2415.
ZHANG G Z, WU M M, YANG J, et al. Preparation of low-shrinkage and radiation-shielding ultra-high performance concrete and its performance formation mechanism[J]. Journal of the Chinese Ceramic Society, 2021, 49(11): 2405-2415 (in Chinese).
[2] 孙蓓, 焦楚杰. 防辐射混凝土的研究现状与发展趋势[J]. 混凝土, 2017(12): 143-146.
SUN B, JIAO C J. Research status and development trend of radiation shielding concrete[J]. Concrete, 2017(12): 143-146 (in Chinese).
[3] TOBBALA D E. Effect of Nano-ferrite addition on mechanical properties and gamma ray attenuation coefficient of steel fiber reinforced heavy weight concrete[J]. Construction and Building Materials, 2019, 207: 48-58.
[4] DAUNGWILAILUK T, YENCHAI C, RUNGJAROENKITI W, et al. Use of barite concrete for radiation shielding against gamma-rays and neutrons[J]. Construction and Building Materials, 2022, 326: 126838.
[5] KHAN M H, ZHAO Q H, ALI SIKANDAR M, et al. Evaluation of mechanical strength, gamma-ray shielding characteristics, and ITZ microstructural properties of heavyweight concrete using nano-silica (SiO₂) and barite aggregates[J]. Construction and Building Materials, 2024, 419: 135483.
[6] 贺智敏, 龙广成, 谢友均, 等. 蒸养混凝土的毛细吸水特性研究[J]. 建筑材料学报, 2012, 15(2): 190-195.
HE Z M, LONG G C, XIE Y J, et al. Water sorptivity of steam curing concrete[J]. Journal of Building Materials, 2012, 15(2): 190-195 (in Chinese).
[7] 王义盛, 赵小鹏, 梁玉强, 等. 养护制度对轻质管片混凝土力学性能和水化性能的影响[J]. 混凝土, 2022(3): 164-167.
WANG Y S, ZHAO X P, LIANG Y Q, et al. Effect of curing regime on mechanical properties and hydration properties of lightweight segment concrete[J]. Concrete, 2022(3): 164-167 (in Chinese).
[8] 葛竞成. 养护制度对轻质超高性能混凝土微观结构的影响机理[D]. 合肥: 安徽建筑大学, 2021.
GE J C. Influence mechanism of curing system on microstructure of lightweight ultra-high performance concrete[D]. Hefei: Anhui Jianzhu University, 2021 (in Chinese).
[9] 孙嘉伦, 张春晓, 毛继泽, 等. 养护制度对超高性能混凝土强度的影响机理[J]. 材料导报, 2024, 38(18): 66-70.
SUN J L, ZHANG C X, MAO J Z, et al. Affecting mechanism of curing regimes on the strength of ultra-high performance concrete[J]. Materials Reports, 2024, 38(18): 66-70 (in Chinese).
[10] 陈聪聪, 吴泽媚, 胡翔, 等. 钢纤维形状和养护制度对超高性能混凝土强度及韧性的影响[J]. 材料导报, 2024, 38(15): 139-149.
CHEN C C, WU Z M, HU X, et al. Influence of steel fiber shape and curing system on strength and toughness of UHPC[J]. Materials Reports, 2024, 38(15): 139-149 (in Chinese).
[11] 陈清己. 重晶石防辐射混凝土配合比设计及其性能研究[D]. 长沙: 中南大学, 2010.
CHEN Q J. Mix proportion design and performance study of barite radiation-proof concrete[D]. Changsha: Central South University, 2010 (in Chinese).
[12] 伍崇明. 核工程抗强辐射屏蔽混凝土试验研究[D]. 长沙: 中南大学, 2008.
WU C M. Experimental study on strong radiation shielding concrete for nuclear engineering[D]. Changsha: Central South University, 2008 (in Chinese).
[13] 罗林成. 高温对防辐射混凝土性能影响及评价方法研究[D]. 衡阳: 南华大学, 2022.
LUO L C. Study on the influence of high temperature on the performance of radiation-proof concrete and its evaluation method[D]. Hengyang: University of South China, 2022 (in Chinese).
[14] GONZÁLEZ-ORTEGA M A, CAVALARO S H P, AGUADO A. Influence of barite aggregate friability on mixing process and mechanical properties of concrete[J]. Construction and Building Materials, 2015, 74: 169-175.
[15] LO MONTE F, GAMBAROVA P G. Thermo-mechanical behavior of baritic concrete exposed to high temperature[J]. Cement and Concrete Composites, 2014, 53: 305-315.
[16] 杜东航. 医用射线屏蔽高性能防辐射混凝土制备及其性能研究[D]. 哈尔滨: 哈尔滨工业大学, 2022.
DU D H. Preparation and properties of high-performance radiation-proof concrete for medical radiation shielding[D]. Harbin: Harbin Institute of Technology, 2022 (in Chinese).