含初始孔隙的堆石混凝土动态抗压性能研究

摘要/Abstract

摘要： 初始缺陷被视为影响混凝土力学特性的主要因素之一。本文采用聚苯乙烯(EPS)颗粒预制了堆石混凝土(RFC)的初始缺陷,以孔隙率定量缺陷含量,系统开展了4种孔隙率RFC在4种应变速率下的单轴压缩试验,探究了应变速率与孔隙率对RFC破坏模式、抗压强度、弹性模量和临界应变的影响。结果表明:不同工况下RFC破坏模式均呈现类似“沙漏”型;RFC的抗压强度、弹性模量和临界应变均具有应变速率强化效应。随着孔隙率增加,RFC的抗压强度、弹性模量和临界应变对应变速率的敏感性不断减弱;相较于应变速率而言,孔隙率对RFC抗压强度、弹性模量与临界应变的影响更为显著。此外,基于Sargin模型,构建了含初始孔隙的RFC动态本构模型,该模型可用于描述含初始孔隙的RFC在低应变速率下的力学行为。

关键词: 堆石混凝土, 聚苯乙烯颗粒, 单轴压缩, 应变速率, 孔隙率, 本构模型

Abstract: Initial defects are identified as one of the root causes affecting the mechanical properties of concrete. In this paper, expanded polystyrene (EPS) particles were utilized to prefabricate initial defects of rock-filled concrete (RFC), and the defect content was quantified by porosity. Uniaxial compression tests of four porosities of RFC at four strain rates were systematically conducted, and the effects of strain rate and porosity on RFC failure modes, compressive strength, elastic modulus, and critical strain were studied. The results show that the RFC failure modes under different operating conditions are similar to the “hourglass” type. The compressive strength, elastic modulus and critical strain of RFC all have strain rate strengthening effect. As the porosity increases, the sensitivity of RFC compressive strength, elastic modulus, and critical strain to strain rate decreases. Compared with strain rate, the effect of porosity on compressive strength, elastic modulus, and critical strain of RFC is more significant. Additionally, based on the Sargin model, a dynamic constitutive model of RFC with initial pores is constructed. It is used to illustrate the mechanical behavior of RFC with initial pores at low strain rates.

Key words: rock-filled concrete, expanded polystyrene particle, uniaxial compression, strain rate, porosity, constitutive model

中图分类号:

TU528

余雷, 乔浩洋, 王国冀, 刘云柯, 任涛, 杨韬. 含初始孔隙的堆石混凝土动态抗压性能研究[J]. 硅酸盐通报, 2024, 43(11): 4036-4046.

YU Lei, QIAO Haoyang, WANG Guoji, LIU Yunke, REN Tao, YANG Tao. Dynamic Compressive Properties of Rock-Filled Concrete with Initial Pores[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4036-4046.

参考文献

[1] 王辉, 马嘉均, 何世钦, 等. 堆石混凝土单轴受压应力-应变全曲线试验方法研究[J]. 水利水电技术, 2021, 52(2): 61-68.
WANG H, MA J J, HE S Q, et al. Study on method for experiment on complete stress-strain curve of rock-filled concrete under uniaxial compression[J]. Water Resources and Hydropower Engineering, 2021, 52(2): 61-68 (in Chinese).
[2] JIN F, HUANG D R, LINO M, et al. A brief review of rock-filled concrete dams and prospects for next-generation concrete dam construction technology[J]. Engineering, 2024, 32: 99-105.
[3] HE S Q, ZHU Z F, LV M, et al. Experimental study on the creep behaviour of rock-filled concrete and self-compacting concrete[J]. Construction and Building Materials, 2018, 186: 53-61.
[4] WEI H, ZHANG G H, SUN F F, et al. Experimental research on the properties of rock-filled concrete[J]. Applied Sciences, 2019, 9(18): 3767.
[5] LIANG T, JIN F, HUANG D R, et al. On the elastic modulus of rock-filled concrete[J]. Construction and Building Materials, 2022, 340: 127819.
[6] 王辉, 马嘉均, 周虎, 等. 堆石混凝土单轴受压力学性能[J]. 清华大学学报(自然科学版), 2022, 62(2): 339-346.
WANG H, MA J J, ZHOU H, et al. Mechanical behavior of rock-filled concrete with uniaxial compression[J]. Journal of Tsinghua University (Science and Technology), 2022, 62(2): 339-346 (in Chinese).
[7] LI X, ZHANG Y F, YANG T, et al. Study on the influence of specimen size and aggregate size on the compressive strength of rock-filled concrete[J]. Applied Sciences, 2023, 13(10): 6246.
[8] LI H N, LIU P F, LI C, et al. Experimental research on dynamic mechanical properties of metal tailings porous concrete[J]. Construction and Building Materials, 2019, 213: 20-31.
[9] 张国辉, 魏雄, 杨振东, 等. 细观初始孔隙缺陷对混凝土力学性能的影响[J]. 建筑材料学报, 2024, 27(5): 425-431.
ZHANG G H, WEI X, YANG Z D, et al. Influence of mesoscopic initial pore defects on the mechanical properties of concrete[J]. Journal of Building Materials, 2024, 27(5): 425-431 (in Chinese).
[10] 席仕军, 左宇军, 孙文吉斌, 等. 基于数字图像处理的含缺陷混凝土破裂过程研究[J]. 应用力学学报, 2020, 37(1): 448-454+499.
XI S J, ZUO Y J, SUN W J B, et al. Research on failure process of concrete with defects based on digital image processing[J]. Chinese Journal of Applied Mechanics, 2020, 37(1): 448-454+499 (in Chinese).
[11] 中华人民共和国水利部. 水工混凝土试验规程: SL/T 352—2020[S]. 北京: 中国水利水电出版社, 2020.
Ministry of Water Resources of the People's Republic of China. Test code for hydraulic concrete: SL/T 352—2020[S]. Beijing: China Water Power Press, 2020 (in Chinese).
[12] 杜修力, 金浏. 考虑孔隙及微裂纹影响的混凝土宏观力学特性研究[J]. 工程力学, 2012, 29(8): 101-107.
DU X L, JIN L. Research on the influence of pores and micro-cracks on the macro-mechanical properties of concrete[J]. Engineering Mechanics, 2012, 29(8): 101-107 (in Chinese).
[13] JIN F, ZHOU H, AN X H. Research on rock-filled concrete dam[J]. International Journal of Civil Engineering, 2019, 17(4): 495-500.
[14] 刘保东, 李鹏飞, 李林, 等. 混凝土含水率对强度影响的试验[J]. 北京交通大学学报, 2011, 35(1): 9-12.
LIU B D, LI P F, LI L, et al. Experimental study on influence of water content on concrete strength[J]. Journal of Beijing Jiaotong University, 2011, 35(1): 9-12 (in Chinese).
[15] LI D Q, LI Z L, LV C C, et al. A predictive model of the effective tensile and compressive strengths of concrete considering porosity and pore size[J]. Construction and Building Materials, 2018, 170: 520-526.[16] JIN L, YU W X, DU X L, et al. Meso-scale modelling of the size effect on dynamic compressive failure of concrete under different strain rates[J]. International Journal of Impact Engineering, 2019, 125: 1-12.
[17] WEN B, HUANG D, ZHANG L, et al. Study on mechanical properties and size effect of coal gangue concrete at mesoscale[J]. Construction and Building Materials, 2022, 360: 129551.
[18] XIAO J Z, LI L, SHEN L, et al. Effects of strain rate on mechanical behavior of modeled recycled aggregate concrete under uniaxial compression[J]. Construction and Building Materials, 2015, 93: 214-222.
[19] FU Q, ZHOU Z M, WANG Z H, et al. Insight into dynamic compressive response of carbon nanotube/carbon fiber-reinforced concrete[J]. Cement and Concrete Composites, 2022, 129: 104471.
[20] WANG Z H, BAI E L, ZHANG T, et al. Early-age mechanical properties and constitutive model of polystyrene concrete under impact load[J]. Materials Today Communications, 2023, 35: 106039.
[21] XIAO J Z, LV Z Y, DUAN Z H, et al. Pore structure characteristics, modulation and its effect on concrete properties: a review[J]. Construction and Building Materials, 2023, 397: 132430.
[22] DENG Z P, CHENG H, WANG Z G, et al. Compressive behavior of the cellular concrete utilizing millimeter-size spherical saturated SAP under high strain-rate loading[J]. Construction and Building Materials, 2016, 119: 96-106.
[23] FENG S W, ZHOU Y, WANG Y, et al. Experimental research on the dynamic mechanical properties and damage characteristics of lightweight foamed concrete under impact loading[J]. International Journal of Impact Engineering, 2020, 140: 103558.
[24] CUSATIS G. Strain-rate effects on concrete behavior[J]. International Journal of Impact Engineering, 2011, 38(4): 162-170.
[25] YAN D M, LIN G. Dynamic properties of concrete in direct tension[J]. Cement and Concrete Research, 2006, 36(7): 1371-1378.
[26] TAKEDA J. Deformation and fracture of concrete subjected to dynamic load[C]//Proceedings of the Conference on Mechanical Behavior of Materials. United Kingdom: Transport and Road Research Laboratory, 1972: 267-277.
[27] SOROUSHIAN P. Dynamic constitutive behavior of concrete[C]//Journal Proceedings. United States: ACI Structural Journal, 1986, 83(2): 251-259.
[28] 孙吉书, 窦远明, 杨春风, 等. 混凝土动态抗压特性的试验研究[J]. 混凝土, 2011(7): 20-22.
SUN J S, DOU Y M, YANG C F, et al. Experimental study on dynamic compressive properties of concrete[J]. Concrete, 2011(7): 20-22 (in Chinese).
[29] BISCHOFF P H, PERRY S H. Compressive strain rate effects of concrete[J]. MRS Online Proceedings Library, 1985, 64(1): 151-165.