模拟地下水压力作用下混凝土硫酸盐腐蚀行为研究
CSTR:
作者:
基金项目:

国家自然科学基金资助项目(51408192);浙江省水利厅科技项目(RA1503)


Corrosion Behaviors of Concrete Exposed to Sulfate Attack with Simulated Groundwater Pressure
Author:
  • 摘要
  • | |
  • 访问统计
  • |
  • 参考文献 [17]
  • |
  • 相似文献
  • |
  • 引证文献
  • | |
  • 文章评论
    摘要:

    针对地下混凝土结构的耐久性问题,利用室内模拟试验技术,研究不同地下水静水压力(0、0.1和0.2 MPa)和粉煤灰掺量(10%、25%和40%)对混凝土受硫酸盐腐蚀的影响,测定了混凝土腐蚀60 d后的腐蚀深度和力学性能指标(抗压强度和动弹性模量)。试验结果表明,混凝土的硫酸盐腐蚀深度随粉煤灰掺量的增加而线性降低;随地下水压力的增加近似呈线性增加。混凝土的抗压强度和动弹性模量随粉煤灰掺量的增加而降低,随地下水压力的增加而略有提高。此外,对混凝土抗压强度和超声波速的相关性进行分析,结果表明粉煤灰和水压力对抗压强度与超声波速关系的影响不明显;通过回归分析建立了硫酸盐腐蚀后混凝土抗压强度和超声波速的指数关系模型。

    Abstract:

    This paper is aimed at the durability of underground concrete structure,and the influence of water pressure (0,0.1 and 0.2 MPa) and fly ash content (10%,25% and 40%) on sulfate corrosion of concrete which were studied by means of laboratory simulation test technique.In the experiment,the sulfate corrosion depth and mechanical properties (compression strength and dynamic elastic modulus) of concrete after 60 days of corrosion were measured.The results show that the sulfate corrosion depth of concrete decreases linearly with the increase of fly ash content,and increases linearly with the increase of water pressure.The compression strength and dynamic elastic modulus of concrete decrease with the increase of fly ash content,and slightly increase with the increase of water pressure.In addition,the relationship between the compression strength and ultrasonic pulse velocity of concrete was analyzed.The result indicates that the influences of fly ash content and water pressure are not obvious.Based on the regression analysis,an exponential model between the compression strength and ultrasonic pulse velocity of concrete exposed to sulfate attack is established.

    参考文献
    [1] ZHUTOVSKY S,HOOTON R D.Experimental study on physical sulfate salt attack[J].Materials and Structures,2017,50(1):54.
    [2] LEEMANN A,LOSER R.Analysis of concrete in a vertical ventilation shaft exposed to sulfate-containing groundwater for 45 years[J].Cement and Concrete Composites,2011,33(1):74-83.
    [3] KUNTHER W,LOTHENBACH B,SKIBSTED J.Influence of the Ca/Si ratio of the C-S-H phase on the interaction with sulfate ions and its impact on the ettringite crystallization pressure[J].Cement and concrete research,2015,69:37-49.
    [4] YOSHIDA N,MATSUNAMI Y,NAGAYAMA M,et al.Salt weathering in residential concrete foundations exposed to sulfate-bearing ground[J].Journal of Advanced Concrete Technology,2010,8(2):121-134.
    [5] YUAN J,LIU Y,TAN Z,et al.Investigating the failure process of concrete under the coupled actions between sulfate attack and drying-wetting cycles by using X-ray CT[J].Construction and Building Materials,2016,108:129-138.
    [6] NIU D,MA R,WANG J,et al.Experiment study on the failure mechanism of dry-mix shotcrete under the combined actions of sulfate attack and drying-wetting cycles[J].Construction and Building Materials,2015,81:74-80.
    [7] CHEN F,GAO J,QI B,et al.Degradation progress of concrete subject to combined sulfate-chloride attack under drying-wetting cycles and flexural loading[J].Construction and Building Materials,2017,151:164-171.
    [8] TAN Y,YU H,MA H,et al.Study on the micro-crack evolution of concrete subjected to stress corrosion and magnesium sulfate[J].Construction and Building Materials,2017,141:453-460.
    [9] JIANG L,NIU D,SUN Y,et al.Ultrasonic testing and microscopic analysis on concrete under sulfate attack and cyclic environment[J].Journal of Central South University,2014,21(12):4723-4731.
    [10] 秦国顺,郑凤.硫酸盐腐蚀粉煤灰混凝土后强度超声检测评定[J].徐州工程学院学报:自然科学版,2010,25(2):33-36.
    [11] 孙丛涛,牛荻涛,元成方,等.混凝土动弹性模量与超声声速及抗压强度的关系研究[J].混凝土,2010(4):14-16.
    [12] 吴骏晖.荷载及水头压力作用下地下结构混凝土硫酸盐腐蚀研究[D].北京:中国矿业大学,2015.
    [13] 叶建雄.掺合料混凝土性能及应用研究[D].重庆:重庆大学,2005.
    [14] ZHOU Y,LI M,SUI L,et al.Effect of sulfate attack on the stress-strain relationship of FRP-confined concrete[J].Construction and Building Materials,2016,110:235-250.
    [15] SAHA A K.Effect of class F fly ash on the durability properties of concrete[J].Sustainable environment research,2018,28(1):25-31.
    [16] ZHANG J,SUN M,HOU D,et al.External sulfate attack to reinforced concrete under drying-wetting cycles and loading condition:Numerical simulation and experimental validation by ultrasonic array method[J].Construction and Building Materials,2017,139:365-373.
    [17] CHANG T P,LIN H C,CHANG W T,et al.Engineering properties of lightweight aggregate concrete assessed by stress wave propagation methods[J].Cement and Concrete Composites,2006,28(1):57-68.
    相似文献
    引证文献
引用本文

蒋建华,翁伟新,裘佳琪.模拟地下水压力作用下混凝土硫酸盐腐蚀行为研究[J].河北工程大学自然版,2019,36(3):11-15

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-06-07
  • 在线发布日期: 2019-11-08
文章二维码