作者：纪泳丞, 张弘锐, 杜任杰, 张小庆, 李微

作者单位：东北林业大学土木工程学院，黑龙江 哈尔滨 150040

关键词：再生砖骨料混凝土;抗压强度;冻融循环;有限元模型

摘要：

为研究再生砖骨料混凝土在不同掺量和不同冻融循环次数下的力学性能变化。通过以红砖粗骨料掺量，钢纤维掺量，冻融循环次数为变量进行试验，研究以上因素对再生砖骨料混凝土力学性能的影响，并通过有限元软件建立有限元模型进行拟合分析。试验结果表明：随着红砖骨料取代率的增加，混凝土试件的立方体抗压强度逐渐降低，且当钢纤维掺量为1%时，再生混凝土试件的立方体抗压强度提高最为显著。抗冻性能方面，随着冻融循环次数的增加，再生混凝土试件的质量损失逐渐提高，且抗压强度逐渐下降。当冻融循环次数在50次以上时，试件强度的降幅趋于平缓。

Experimental research on the deterioration law of recycled brick aggregate concrete mechanical properties
JI Yongcheng, ZHANG Hongrui, DU Renjie, ZHANG Xiaoqing, LI Wei
College of Civil Engineering, Northeast Forestry University, Harbin 150040, China
Abstract: This study investigates the mechanical properties of recycled brick aggregate concrete under different admixtures and freeze-thaw cycles. Through experiments with red brick coarse aggregate content, steel fiber content, and freeze-thaw cycle times as variables, the influence of the above factors on the mechanical properties of recycled brick aggregate concrete is studied, and a finite element model is established through finite element software for fitting analyze. The test results show that with the increase of the replacement rate of the red brick aggregate, the cubic compressive strength of the concrete specimens gradually decreases, and when the steel fiber content is 1%, the cubic compressive strength of the recycled concrete specimens increases most significantly. In terms of frost resistance, as the number of freeze-thaw cycles increases, the mass loss of recycled concrete specimens gradually increases, and the compressive strength decreases. However, when the number of freeze-thaw cycles is more than 50 times, the decrease in the strength of the specimen tends to be gentle.
Keywords: recycled brick aggregate concrete;compressive strength;freeze-thaw cycle;finite element model
2022, 48(11):54-61  收稿日期: 2021-06-25;收到修改稿日期: 2021-09-01
基金项目: 2020年黑龙江省留学回国人员择优资助经费（415001）
作者简介: 纪泳丞（1986-），男，山东淄博市人，副教授，博士，研究方向为混凝土结构加固及耐久性分析
参考文献
[1] 刘欣, 王君燕, 张兵. 国内外建筑垃圾管理研究进展与热点——基于CiteSpace的可视化分析[J]. 项目管理技术, 2021, 19(4): 68-72
[2] 马昆林,黄新宇,胡明文. 砖混再生粗骨料混凝土力学性能及工程应用研究[J]. 硅酸盐通报, 2020, 39(8): 2600-2607
[3] ZHENG C C, LOU C, DU G, et al. Mechanical properties of recycled concrete with demolished waste concrete aggregate and clay brick aggregate[J]. Results in Physics, 2018, 9: 1317-1322
[4] 陈德玉, 刘来宝, 严云, 等. 不同因素对再生骨料混凝土抗冻性的影响[J]. 武汉理工大学学报, 2011, 33(5): 54-58
[5] 霍俊芳, 白笑笑, 姜鹏飞, 等. 钢纤维和聚丙烯纤维再生混凝土力学性能研究[J]. 混凝土, 2019(8): 92-95+99
[6] 牛荻涛, 申洋, 张婷, 等. 不同纤维掺量的聚丙烯纤维再生砖混凝土力学性能试验研究[J/OL]. 工业建筑: 1-8[2021-08-10].
[7] HOU S D, DUAN Z H, XIAO J Z, et al. Effect of moisture condition and brick content in recycled coarse aggregate on rheological properties of fresh concrete[J]. Journal of Building Engineering, 2021, 35: 102075
[8] 刘玮辉. 再生混凝土多孔砖耐久性与砖的抗冻指标试验研究[D]. 长沙: 长沙理工大学, 2012.
[9] 盛朝晖, 牛培飞, 游文斐. 多因素对再生混凝土力学性能及抗冻性的影响[J]. 中国测试, 2021, 47(2): 140-148
[10] 白亚东, 黄志强, 付旭, 等. 再生混凝土抗冻性影响因素与防冻措施研究综述[J]. 混凝土, 2020(6): 98-101+105
[11] KAZMI S M S, MUNIR M J, WU Y F, et al. Effect of different aggregate treatment techniques on the freeze-thaw and sulfate resistance of recycled aggregate concrete[J]. Cold Regions Science and Technology, 2020, 178: 103126
[12] MENG D, WU X M, QUAN H Z, et al. A strength-based mix design method for recycled aggregate concrete and consequent durability performance[J]. Construction and Building Materials, 2021, 281: 122616
[13] ZHU P H, HAO Y L, LIU H, et al. Durability evaluation of recycled aggregate concrete in a complex environment[J]. Journal of Cleaner Production, 2020, 273: 122569
[14] ZHANG S P, HE P L, NIU L L. Mechanical properties and permeability of fiber-reinforced concrete with recycled aggregate made from waste clay brick[J]. Journal of Cleaner Production, 2020, 268: 121690
[15] 普通混凝土用砂 石质量及检验方法标准: JGJ 52—2006[S]. 北京: 中国建筑工业出版社, 2006.
[16] 建设用卵石、碎石: GB/T 14685—2011[S]. 北京: 中国建筑工业出版社, 2011.
[17] 混凝土用水标准: JGJ 63—2006[S]. 北京: 中国建筑工业出版社, 2006.
[18] 通用硅酸盐水泥: GB 175—2007[S]. 北京: 中国建筑工业出版社, 2007.
[19] 普通混凝土拌合物性能试验方法标准: GB/T 50080—2002[S]. 北京: 中国建筑工业出版社, 2002.
[20] 混凝土物理力学性能试验方法标准: GB/T 50081—2019[S]. 北京: 中国建筑工业出版社, 2019.
[21] 普通混凝土长期性能和耐久性能试验方法标准: GB/T 50082—2009[S]. 北京: 中国建筑工业出版社, 2009.
[22] 段东旭. 基于细观结构的再生混凝土力学性能研究[D]. 西安: 西安理工大学, 2018.