[1]石建文,宋战平,崔国静,等.冻融循环作用下钢纤维煤矸石混凝土抗冻性能研究[J].西安建筑科技大学学报(自然科学版),2023,55(01):52-59.[doi:10.15986/j.1006-7930.2023.01.007 ]
　SHI Jianwen,SONG Zhanping,CUI Guojing,et al.Study on frost resistance of steel fiber gangue concrete under freeze-thaw circulation[J].J. Xi'an Univ. of Arch. & Tech.(Natural Science Edition),2023,55(01):52-59.[doi:10.15986/j.1006-7930.2023.01.007 ]
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冻融循环作用下钢纤维煤矸石混凝土抗冻性能研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
55
期数:
2023年01期
页码:
52-59
栏目:
出版日期:
2023-02-28

文章信息/Info

Title:
Study on frost resistance of steel fiber gangue concrete under freeze-thaw circulation
文章编号:
1006-7930(2023)01-0052-08
作者:
石建文1; 2; 宋战平1; 3; 崔国静1; 3; 程 昀4; 严 冰3
(1.陕西省岩土与地下空间工程重点实验室,陕西 西安 710055; 2.工科实业集团有限公司,陕西 西安 710054; 3.西安建筑科技大学 土木工程学院, 陕西 西安 710055; 4.盐城工学院 土木工程学院, 江苏 盐城 224051)
Author(s):
SHI Jianwen1; 2; SONG Zhanping1; 3; CUI Guojing1; 3; CHENG Yun4; YAN Bing3
(1.Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi'an 710055, China; 2.Engineering Industry Group Co., Ltd., Xi'an 710054, China; 3.School of Civil Engineering, Xi'an Univ. of Arch. & Tech., Xi'an 710055, China; 4.School of Civil Engineering, Yancheng Institute of Technology, Jiangsu Yancheng 224051, China)
关键词:
冻融循环作用; 钢纤维; 煤矸石混凝土; 抗冻性能; 微观冻融机理
Keywords:
freeze-thaw circulation;  steel fiber;  gangue concrete;  frost resistance;  micro freezing and melting mechanism
分类号:
TU443
DOI:
10.15986/j.1006-7930.2023.01.007
文献标志码:
A
摘要:
寒区冻害是影响混凝土结构耐久性的重要因素.为揭示冻融循环作用下钢纤维煤矸石混凝土的抗冻性能及微观冻融机理,对棱柱体钢纤维煤矸石混凝土试样进行了冻融循环及SEM试验.结果表明:冻融导致素混凝土裂隙贯通且结构呈松散状,抗冻能力偏差.掺入钢纤维起到增强阻裂作用,抗冻能力明显提高.钢纤维煤矸石混凝土的质量损失率与冻融循环次数呈线性-指数函数增长.冻融效应对动弹模量的变化率具有劣化作用,动弹模量损失率呈线性衰减.劈拉强度随钢纤维体积率提高呈先增大后衰减变化,钢纤维体积率为2.00%的混凝土的强化作用明显低于0.50%～1.50%,钢纤维明显降低了混凝土的冻融损伤.随着冻融次数增大,素混凝土表层剥落显著,钢纤维混凝土未出现结构疏松现象.钢纤维限制了裂隙贯通,具有明显的增强阻裂作用.研究成果可为钢纤维煤矸石混凝土在寒区建筑工程中的应用提供参考.
Abstract:
Cold damage in cold area is an important factor affecting the durability of concrete structure. To reveal the freezing resistance and micro freezing mechanism of steel fiber gangue concrete under the freezing and thaw cycle, the freeze and thaw cycle and SEM testing of prismatic steel fiber gangue concrete sample were conducted. The results show that freezing and thawing lead to plain concrete crack through and loose structure. The mixed steel fiber plays the role of crack resistance, freezing resistance is significantly improved. The mass loss rate and the frequency of freeze-thaw cycle increase by linear-exponential function. The freeze-thaw effect degraded the change rate of moving modulus, and the loss rate shows linear decay. The split tensile strength increases with the increase of the steel fiber volume rate and then attenuates. The strengthening effect of the concrete with the steel fiber volume rate of 2.00% is obviously lower than 0.50%～1.50%, and the steel fiber obviously reduces the freeze-thawing damage of the concrete. With the increase of freeze-thaw effect, the surface peeling of plain concrete is obvious, and the steel fiber concrete does not appear loose structure. Steel fiber limits the crack penetration and has obvious enhanced crack resistance. The research results can provide a reference for the application of steel fiber coal gangue concrete in construction engineering in cold area.

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备注/Memo

备注/Memo:
收稿日期:2022-09-18修改稿日期:2023-01-18
基金项目:陕西省创新能力支撑计划-创新团队基金资助项目(2020TD-005)
第一作者:石建文(1963—),男,博士,高级工程师,主要从事建筑工程方面的研究.E-mall:sjwceo@126.com
通信作者:宋战平(1974—),男,博士后,教授,主要从事隧道与地下空间工程方面的研究.E-mall:songzhpyt@xauat.edu.cn
更新日期/Last Update: 2023-02-20