Please wait a minute...
浙江大学学报(工学版)
J4  2012, Vol. 46 Issue (7): 1255-1261    DOI: 10.3785/j.issn.1008-973X.2012.07.016
土木工程     
干湿交替环境下混凝土受硫酸盐侵蚀劣化机理
王海龙1,董宜森1,2,孙晓燕1, 金伟良1
1.浙江大学 土木工程学系,浙江 杭州 310058; 2. 浙江绿城建筑设计有限公司,浙江 杭州 310027
Damage mechanism of concrete deteriorated by sulfate attack
in wet-dry cycle environment
WANG Hai-long1, DONG Yi-sen1,2, SUN Xiao-yan1, JIN Wei-liang1
1. Department of Civil Engineering, Zhejiang University, Hangzhou 310058,China;
2. Greentown Architectural Design Limited Company, Hangzhou 310027, China
 全文: PDF  HTML
摘要：

通过试验模拟干湿循环作用下混凝土受不同质量分数硫酸钠的侵蚀特点,从不同侵蚀时间后混凝土的表观特征、质量经时变化规律、混凝土中硫酸根离子分布、侵蚀深度、混凝土轴心抗压强度、劈裂抗拉强度经时退化规律、变形经时变化规律等方面全面衡量混凝土的硫酸盐侵蚀损伤特征；讨论硫酸盐溶液质量分数、侵蚀龄期对混凝土损伤累积规律的影响；根据SEM图像分析受蚀混凝土的微观结构特征,揭示了干湿循环和硫酸盐侵蚀共同作用下,不同侵蚀时期后混凝土损伤的演变机理.试验结果表明,在干湿循环作用下硫酸钠对混凝土的侵蚀损伤是侵蚀产物与硫酸盐结晶膨胀共同作用的结果；在侵蚀初期由于晶体的填充密实作用,使得受蚀混凝土的质量、强度与延性增大；随着侵蚀时间的延长,混凝土不仅受到钙矾石、石膏等侵蚀产物的膨胀损伤作用,而且叠加了干湿循环过程中Na2SO4·10H2O的结晶膨胀作用,使得混凝土损伤反复进行并不断累积,加速了混凝土的受蚀劣化速度,质量、强度逐渐降低,脆性变大；由于拉应力的叠加效应,混凝土劈裂抗拉强度对硫酸盐侵蚀损伤更敏感.
Abstract:

Some experiments were conducted to simulate the deterioration of concrete under sodium sulfate and wet-dry cycle environment in order to reveal the damage mechanism of sulfate attack. The damage development was evaluated by apparent characteristics of attacked concrete, weight changes over erosion time, profile of sulfate ions in concrete, erosion depth, degradation of compressive and splitting tensile strengths with erosion time, and deformation over attacked time. The parameters’ effects such as the mass fraction  of sulfate solution and the attacked time on the damage accumulation were analyzed. According to the SEM images, the damage mechanism was achieved by analyzing the microstructures of deteriorated concretes at different erosion periods. Experimental results show that the damage of concrete under sodium sulfate and wet-dry cycle environment is caused by the expansion of chemical reaction products and crystallization of sodium sulfate. The weight, strengths and ductility of concrete increase with the increase of erosion time due to the filling effect of crystals at the beginning periods. However, with the increase of erosion time, the combined expansions of ettringite, gypsum and crystal of sodium sulfate decahydrate (Na2SO4·10H2O) accelerate the evolution of damage, which results in a reduction of concrete strength and increases of weight loss and brittleness. Compared with the compressive strength, the tensile strength is more sensitive to the sulfate attacked damage due to the superimposed effect of tensile stress．
出版日期: 2012-07-01
:  TU 528.1  
基金资助:

国家自然科学基金资助项目（51178417，50809061）；中央高校基本科研业务费专项资金资助项目；国家“863”高技术研究发展计划资助项目（2007AA04Z437）.
通讯作者: 孙晓燕，女，副教授.     E-mail: selina@zju.edu.cn
作者简介: 王海龙(1974-)，男，副教授，从事混凝土材料与结构的耐久性研究.E-mail: hlwang@zju.edu.cn
服务　　
把本文推荐给朋友
加入引用管理器
E-mail Alert
RSS
作者相关文章　　

引用本文:

王海龙,董宜森,孙晓燕, 金伟良. 干湿交替环境下混凝土受硫酸盐侵蚀劣化机理[J]. J4, 2012, 46(7): 1255-1261.

WANG Hai-long, DONG Yi-sen, SUN Xiao-yan, JIN Wei-liang. Damage mechanism of concrete deteriorated by sulfate attack
in wet-dry cycle environment. J4, 2012, 46(7): 1255-1261.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2012.07.016    或    http://www.zjujournals.com/eng/CN/Y2012/V46/I7/1255

［1］ SANTHANAM M,COHEN M,OLEK J. Sulfate attack researchwhither now ［J］. Cement and Concrete Research, 2001, 31(6): 845-851．
［2］ SIBBICK R G, CRAMMOND N J, METCALF D. The microscopical characterization of thaumasite ［J］. Cement and Concrete Composites, 2003, 25(8): 831-837．
［3］ 黄战,邢锋,邢媛媛,等. 硫酸盐侵蚀对混凝土结构耐久性的损伤研究［J］. 混凝土, 2008, 226 (8): 45-49．
HUANG Zhan, XING Feng, XING Yuanyuan, et al. Durability damage of concrete structures caused by sulfate attack ［J］. Concrete, 2008, 226(8): 45-49．
［4］ TIXIER R, MOBASHER B. Modeling of damage in cementbased materials subjected to external sulfate attack ［J］. Journal of Materials in Civil Engineering, 2003, 4(15): 305-322．
［5］ 元强,邓德华,张文恩,等. 硫酸钠侵蚀下掺粉煤灰砂浆的体积膨胀规律及其机理研究［J］.混凝土, 2006, 195(1): 34-42．
YUAN Qiang, DENG Dehua, ZHANG Wenen, et al. Rules and mechanisms of expansion of mortar with fly ash ［J］. Concrete, 2006, 195(1): 34-42．
［6］ 高润东, 赵顺波, 李庆斌, 等. 干湿循环作用下混凝土硫酸盐侵蚀劣化机理试验研究［J］. 土木工程学报, 2010, 43 (2): 48-53．
GAO Rundong, ZHAO Shunbo, LI Qingbin, et al. Experimental study of the deterioration mechanism of concrete under sulfate attack in wetdry cycles ［J］. China Civil Engineering Journal, 2010, 43 (2): 48-53．
［7］ SANTHANAM M, COHEN M D, OLEK J. Mechanisms of sulfate attack: a fresh look Part II: proposed mechanisms ［J］. Cement and Concrete Research, 2003, 33(3): 341-346．
［8］ 梁咏宁, 袁迎曙. 硫酸钠和硫酸镁溶液中混凝土腐蚀破坏的机理［J］. 硅酸盐学报,2007,35(4): 504-508．
LIANG Yongning, YUAN Yingshu. Mechanism of concrete destruction under sodium sulfate and magnesium sulfate solution ［J］. Journal of the Chinese Ceramic Society, 2007, 35(4): 504-508．
［9］ WANG H L, LU C H, JIN W L, et al. Effect of external loads on the chloride transport in concrete ［J］. Journal of Materials in Civil Engineering, 2011, 23(7): 1043-1049．
［10］ GB1752007, 通用硅酸盐水泥［S］. 北京：中国标准出版社, 2008．
［11］ GB/T60092003, 工业无水硫酸钠［S］. 北京：中国标准出版社, 2003．
［12］ 李凤兰, 马利衡, 高润东, 等. 侵蚀方式对硫酸根离子在混凝土中传输的影响［J］. 长江科学院院报, 2010, 27(3): 62-65．
LI Fenglan, MA Liheng, GAO Rundong, et al. Influence of erosion modes on sulfateion transportation in concrete ［J］. Journal of Yangtze River Scientific Research Institute, 2010, 27(3): 62-65．
［13］ FLATT R J. Salt damage in porous materials: how high supersaturations are generated ［J］. Journal of Crystal Growth, 2002, 242(3/4): 435-454．
［14］ TSUI N, FLATT R J, SCHERER G W. Crystallization damage by sodium sulfate ［J］. Journal of Cultural Heritage, 2003, 4(2): 109-115．
[1] 王海龙, 郭春伶, 孙晓燕, 金伟良. 软水侵蚀混凝土的性能劣化细观机理[J]. J4, 2012, 46(10): 1887-1892.
[2] 延永东, 金伟良, 王海龙. 饱和状态下开裂混凝土内的氯离子输运[J]. J4, 2011, 45(12): 2127-2133.