全再生混凝土的抗压强度与耐久性能研究
Research on compressive strength and durability of fully recycled concrete
关键词：
全再生混凝土；正交试验；抗压强度；相对动弹性模量；质量损失率；氯离子扩散系数
Key words：
Fully recycled concrete; Orthogonal experiment; Compressive strength; Relative dynamic elastic modulus; Mass loss rate; Chloride ion diffusion coefficient
刊期：
2025年第8期
DOI：
10.19761/j.1000-4637.2025.08.036.05
文章编号：
基金项目：
国家自然科学基金项目（52108216）；泰州市科技支撑计划项目（TS202326）。
作者：
董晓进1，王 卫1，袁继峰1，徐 俊2
单位：
1.南京理工大学泰州科技学院，江苏 泰州 225300；2.江苏科技大学 土木工程与建筑学院， 江苏 镇江 212100
摘要
摘 要：采用正交试验方法研究了再生粉体掺量（15%、30%、45%）、再生粗骨料掺量（30%、50%、70%）、再生细骨料掺量（30%、50%、70%）对全再生混凝土抗压强度的影响；基于信噪比对抗压强度数据进行了优化，并建立了多元线性回归模型；通过相对动弹性模量、质量损失率、氯离子扩散系数测试研究了全再生混凝土的耐久性能。结果表明：各因素对试件抗压强度影响程度大小排序为再生粉体掺量＞再生粗骨料掺量＞再生细骨料掺量；随着再生粉体、再生骨料掺量的增加，试件的抗压强度降低；基于信噪比优化后的抗压强度小于实测抗压强度；所建立的抗压强度多元线性回归模型理论值与试验值基本相等；随着再生粉体、再生骨料掺量的增加，试件的耐久性能降低；相同深度处试件内部氯离子含量排序为9#＞1#＞0#。
Abstract: The influence of recycled powder content(15%, 30%, 45%）, recycled coarse aggregate content(30%, 50%, 70%), and recycled fine aggregate content(30%, 50%, 70%) on the compressive strength of fully recycled concrete was studied by using orthogonal experimental method. Compressive strength data based on signal-to-noise ratio was optimized, and a multiple linear regression model was established. The durability of fully recycled concrete was studied through testing of relative dynamic elastic modulus, mass loss rate, and chloride ion diffusion coefficient. The results indicate that the order of the influence of various factors on the compressive strength of the specimens is as follows: recycled powder content > recycled coarse aggregate content > recycled fine aggregate content. As the content of recycled powder and recycled aggregate increases, the compressive strength of the specimens decreases. The compressive strength optimized by signal-to-noise ratio is lower than the measured compressive strength. The theoretical values of the established multiple linear regression model for compressive strength are basically equal to the experimental values. With the increase of recycled powder and recycled aggregate content, the durability of the specimens decreases. The order of chloride ion content inside the specimens at the same depth is 9#>1#>0#.
结论
（1）各因素对试件28 d抗压强度影响程度大小排序为再生粉体掺量＞再生粗骨料掺量＞再生细骨料掺量。随着再生粉体、再生骨料掺量的增加，试件的抗压强度均降低。基于田口方法中信噪比优化后的抗压强度小于实测抗压强度，采用该方法优化抗压强度可以整体上降低抗压强度数据偏差较大及稳定性差的情况。
（2）本文建立的抗压强度多元线性回归模型理论值与试验值基本相等，模型具有可靠性。
（3）随着浸泡龄期的增加，试件的相对动弹性模量先增加后降低，质量损失率先降低后增加，耐久性能先增加后降低；随着再生粉体、再生骨料掺量的增加，试件的耐久性能降低，1#组试件的相对动弹性模量和质量损失率与0#组较接近。
（4）各组试件中的氯离子含量均随深度的增加而降低，且逐渐趋于平稳。相同深度处试件内部氯离子含量排序为9#＞1#＞0#。与0#组相比，1#、9#组试件的氯离子扩散系数增加，抗氯离子渗透性能降低。
参考文献
[1] 肖建庄,张航华,唐宇翔,等.废弃混凝土再生原理与再生混凝土基本问题[J].科学通报,2023,68(5):510-523.
[2] 蒋正武,高文斌,杨巧,等.低碳混凝土的技术理念与途径思考[J].建筑材料学报,2023,26(11):1143-1150.
[3] 张天轩,李秀领,郭强.全再生混凝土力学性能及导热性能研究[J].新型建筑材料,2023,50(7):47-51,65.
[4] 陈旭勇,刘榴,程书凯,等.再生粗骨料品质和掺量对再生混凝土力学性能的影响[J].混凝土与水泥制品,2021(12):89-93.
[5] 沈振宗,闫庆尧,吕文龙,等.不同再生骨料替代率的振动搅拌混凝土耐久性研究[J].新型建筑材料,2023,50(3):26-28,41.
[6] 蒋建华,吴琦,付用全,等.掺粉煤灰再生混凝土吸湿过程与预测模型研究[J].建筑材料学报,2022,25(3):248-255.
[7] GAO S,JI Y,LIU A,et al.The adsorption and diffusion behavior of chloride in recycled aggregate concrete incorporated with calcined LDHs[J].Cement and Concrete Composites,2024,148:105452.
[8] KIM J.Influence of quality of recycled aggregates on the mechanical properties of recycled aggregate concretes: An overview[J].Construction and Building Materials,2022,328:127071.
[9] 郭远新,李秋义,岳公冰,等.考虑粗骨料品质和取代率的再生混凝土抗压强度计算[J].建筑结构学报,2018,39(4):153-159.
[10] 肖建庄,马旭伟,刘琼,等.全再生混凝土概念的衍化与研究进展[J].建筑科学与工程学报,2021,38(2):1-15.
[11] GONG W,WANG N,ZHANG N,et al.Water resistance and a comprehensive evaluation model of magnesium oxychloride cement concrete based on Taguchi and entropy weight method[J].Construction and Building Materials,2020,260:119817.
[12] GONG W,WANG N,ZHU H W,et al.Protection and time-varying characteristic of rebar corrosion in magnesium oxychloride cement recycled concrete under the simulated salt lake environment[J].Journal of Materials in Civil Engineering,2023,35(9):04023313.
[13] WANG B,YAN L B,FU Q N,et al.A comprehensive review on recycled aggregate and recycled aggregate concrete[J].Resources,Conservation and Recycling,2021,171:105565.
[14] LI W X,JIANG T,JIN R Y,et al.Optimization of the preparation process of fair-faced concrete incorporating recycled aggregates[J].Construction and Building Materials,2022,326:126908.
[15] 肖建庄,马旭伟,段珍华,等.再生粉体取代率对全再生混凝土力学性能的影响[J].建筑技术,2021,52(7):785-789.
[16] WU Q Y,MA Q Y,HUANG X W,et al.Mechanical properties and damage evolution of concrete materials considering sulfate attack[J].Materials,2021,14(9):2343.
[17] WANG J J,LIU E G,LI L.Multiscale investigations on hydration mechanisms in seawater OPC paste[J].Construction and Building Materials,2018,191:891-903.
[18] LI W W,JIANG Z L,LU M Y,et al.Effects of seawater, NaCl, and Na2SO4 solution mixing on hydration process of cement paste[J].Journal of Materials in Civil Engineering,2021,33(5):04021057.
[19] YING J W,XIE Z M,CHEN B X,et al.Chloride ion diffusion and distribution characteristics in recycled coarse aggregate concrete under uniaxial and biaxial pressure[J].Journal of Building Engineering,2023,77:107469.
[20] YU Y,LIN L.Modeling and Predicting chloride diffusion in recycled aggregate concrete[J].Construction and Building Materials,2020,264:120620.
[21] 蒋林华,朱承龙,徐宁,等.拉伸疲劳对混凝土氯离子扩散的影响[J].建筑材料学报,2016,19(3):456-460.
[22] WANG X F,DU G H,CAI L M,et al.Effect of crystallizer treatment on chloride diffusion and microstructure of recycled aggregate concrete[J].Construction and Building Materials,2022,321:126273.
引用本文
董晓进,王卫,袁继峰,等.全再生混凝土的抗压强度与耐久性能研究[J].混凝土与水泥制品,2025(8):36-40.
DONG X J,WANG W,YUAN J F,et al.Research on compressive strength and durability of fully recycled concrete[J].China Concrete and Cement Products,2025(8):36-40.
上一个： 基于响应面法的花岗岩骨料混凝土配合比优化
相关文件