海水海砂混凝土双K断裂参数的确定
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摘要
采用尺寸为515 mm×100 mm×100 mm初始缝高比从0.1变化至0.8的三点弯曲梁试件,利用试验测得起裂荷载Pini、最大荷载Pmax及对应的裂缝口张开位移CMODc等参数,研究了缝高比a0/h对海水海砂混凝土双K断裂参数的影响。并以相同配合比的淡水河砂梁作为对照组,进一步研究了海砂海水混凝土双K断裂参数与普通混凝土之间的关系。结果发现海水海砂混凝土断裂参数在a0/h=0.25～0.7范围内时可以认为是一常数;海水海砂混凝土梁断裂参数比相同配合比情况下的淡水河砂梁大且对边界影响更加敏感。
In this study,three-point bending tests are carried out on notched seawater sea sand concrete( SSC) beams with sizes of100 mm×100 mm×515 mm and initial notch-to-depth ratios a0/h from 0.1 to 0.8. The initial cracking load Pini,maximum load Pmaxand corresponding crack mouth opening displacement CMODcare obtained from the tests. The effect of a0/h on the double-K fracture parameters is analyzed. Moreover,tests on ordinary concrete( OPC) with the same mix proportion are performed for comparison.Results show that the fracture parameters of SSC almost keep constant when the a0/h is from 0.25 to 0.7 and they are more sensitive to the boundary effects compared to those of OPC.
In this study,three-point bending tests are carried out on notched seawater sea sand concrete( SSC) beams with sizes of100 mm×100 mm×515 mm and initial notch-to-depth ratios a0/h from 0.1 to 0.8. The initial cracking load Pini,maximum load Pmaxand corresponding crack mouth opening displacement CMODcare obtained from the tests. The effect of a0/h on the double-K fracture parameters is analyzed. Moreover,tests on ordinary concrete( OPC) with the same mix proportion are performed for comparison.Results show that the fracture parameters of SSC almost keep constant when the a0/h is from 0.25 to 0.7 and they are more sensitive to the boundary effects compared to those of OPC.
引文
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[2]陈兆林,唐筱宁,孙国峰,等.海水拌养混凝土耐久性试验与应用[J].海洋工程,2008,26(4):102-106.(CHEN Zhaolin,TANG Youning,SUN Guofeng,et al. Study on the repair and application of concrete in seawater mixed with coral reefs in reef engineering[J]. The Ocean Engineering,2008,26(4):102-106.(in Chinese))
[3]糜人杰,余红发,麻海燕,等.全珊瑚骨料海水混凝土力学性能试验研究[J].海洋工程,2016,34(4):47-54.(MI Renjie,YU Hongfa,MA Haiyan,et al. Study on the mechanical property of coral concrete[J].The Ocean Engineering,2016,34(4):47-54(in Chinese))
[4]窦雪梅,余红发,麻海燕,等.珊瑚混凝土在海洋环境中氯离子扩散实验[J].海洋工程,2017,35(1):129-135.(DOU Xuemei,YU Hongfa,MA Haiyan,et al. Experiment on chloride diffusion coefficient of coral concrete exposed to marine environment[J]. The Ocean Engineering,2017,35(1):129-135.(in Chinese))
[5]许晨,金伟良,李志远,等.一种新的模拟潮差区混凝土受氯盐侵蚀试验方法[J].海洋工程,2011,29(4):51-59.(XU Chen,JIN Weiliang,LI Zhiyuan,et al. A new test method to simulate chloride penetration into concrete in tidal zone[J].The Ocean Engineering,2011,29(4):51-59.(in Chinese))
[6]张敏,卢博.热带海岛混凝土在腐蚀介质中的腐蚀及反腐蚀措施的研究[J].海洋工程,1997,15(2):88-91.(ZHANG Min,LU Bo. Study on corrosion and anticorrosion measures of tropical island concrete in corrosive medium[J]. The Ocean Engineering,1997,15(2):88-91.(in Chinese))
[7]季明棠,牟肇翚,杨芳英,等.钢筋混凝土中的镶嵌式参比电极的研制与测试[J].海洋工程,1993,11(4):40-46.(JI Mingtang,MOU Zhaohui,YANG Fangying. Development and test of mosaic type reference electrode in reinforced concrete[J].The Ocean Engineering,1993,11(4):40-46.(in Chinese))
[8]卢博,梁元博.混凝土的声学测量[J].海洋工程,1993,11(1):70-77.(LU Bo,LIANG Yuanbo. Acoustic measurement of concrete[J]. The Ocean Engineering,1993,11(1):70-77.(in Chinese))
[9]王圣洁,刘锡清,戴勤奋,等.中国海砂资源分布特征及找矿方向[J].海洋地质与第四纪地质,2003(3):83-89.(WANG Shengjie,LIU Xiqing,DAI Qinfen,et al. Distribution characteristics and prospecting direction of sea sand resources in China[J]. Marine Geology&Quaternary Geology,2003(3):83-89.(in Chinese))
[10] LIMEIRA J,ETXEBERRIA M,AGULLO'L,et al. Mechanical and durability properties of concrete made with dredged marine sand[J]. Construction&Building Materials,2011,25(11):4165-4174.
[11]尹飞龙,欧阳东,温喜廉,等.海砂与河砂、尾砂作为建筑用砂的比较研究[J].混凝土,2011(12):73-75.(YIN Feilong,OU Yangdong,WEN Xilian,et al.Comparative study of sea sand,river sand and tailing sand which using as building sand[J]. Concrete,2011(12):73-75.(in Chinese))
[12]刘伟,谢友均,董必钦,等.海砂特性及海砂混凝土力学性能的研究[J].硅酸盐通报,2014,33(1):15-22.(LIU Wei,XIE Youjun,DONG Biqin,et al. Study on characteristics of dredged marine sand and the mechanical properties of concrete made with dredged marine sand[J]. Bulletin of the Chinese Ceramic Society,2014,33(1):15-22.(in Chinese))
[13]潘珠峰.海砂混凝土的应用现状及发展研究[C]∥第十五届全国现代结构工程学术研讨会论文集. 2015:10.(PAN Zhufeng. Study on application status and development of sea sand concrete[C]∥Proceedings of the 15th National Symposium on Modern Structural Engineering. 2015:10.(in Chinese))
[14]肖建庄,张鹏,张青天,等.海水海砂再生混凝土的基本力学性能[J].建筑科学与工程学报,2018,35(2):16-22.(XIAO Jianzhuang,ZHANG Peng,ZHANG Qingtian,et al. Basic mechanical properties of seawater sea-sand recycled concrete[J]. Journal of Architecture and Civil Engineering,2018,35(2):16-22.(in Chinese))
[15]黄华县.海砂混凝土耐久性试验研究[D].广州:暨南大学,2007.(HUANG Huaxian. An experimental study on the durability of sea sand concrete[D]. Guangzhou:Jinan University,2007.(in Chinese))
[16]连金龙. FRP筋增强海砂混凝土梁耐腐蚀性能试验研究[D].南京:东南大学,2017.(LIAN Jinlong. Experimental research on durability of FRP Reinforced sea sand concrete beams[D]. Nanjing:Southeast University,2017.(in Chinese))
[17]许海雄,曹宝珠,欧马立·加斯索. FRP筋海砂混凝土的应用与研究现状分析[J].混凝土,2016(6):151-154.(XU Haixiong,CAO Baozhu,OU Mali·jiasisuo. Analysis on application and research status on sea sand concrete reinforced with FRP bars[J]. Concrete,2016(6):151-154.(in Chinese))
[18] HILLERBORG A,MODER M,PETERSSON P E. Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements[J]. Cement and Concrete Research,1976,6(6):773-782.
[19] JENQ Y S,SHAH S P. Two parameter fracture model for concrete[J]. Journal of Engineering Mechanics,1985,111(10):1227-1241.
[20] BAZANT Z P,OH B H. Crack band theory for fracture of concrete[J]. Materials and Structures,1983,16(3):155-177.
[21]KARIHALOO B L,NALLATHAMBI P. An improved effective crack model for the determination of fracture toughness of concrete[J]. Cement and Concrete Research,1989,19(4):603-610.
[22] REFAI T M E,SWART S E. Fracture behavior of concrete beams in three-point bending considering the influence of size effects[R]. Kansas State University Engineering Experiments Station,Report No.190,1987.
[23]徐世烺,赵国藩.混凝土结构裂缝扩展的双K断裂准则[J].土木工程学报,1992(2):32-38.(XU Shilang,ZHAO Guofan. A double-K fracture criterion for the crack propagation in concrete structures[J]. China Civil Engineering Journal,1992(2):32-38.(in Chinese))
[24]徐世烺.混凝土断裂力学[M].北京:科学出版社,2011:224-270(XU Shilang. Concrete fracture mechanics[M]. Beijing:Science Press,2011:224-270.(in Chinese))
[25]张剑,叶见曙,赵新铭.混凝土梁起裂荷载确定的试验研究[J].工业建筑,2006(S1):295-298.(ZHANG Jian,YE Jianshu,ZHAO Xinming. Experimental study on the damage and fracture characteristics of notched concrete beams[J].Industrial Construction,2006(S1):295-298.(in Chinese))
[26]徐世烺,赵国藩.混凝土裂缝的稳定扩展过程与临界裂缝尖端张开位移[J].水利学报,1989,20(4):33-44.(XU Shilang,ZHAO Guofan. The stable propagation of crack in concrete and the determination of critical crack tip opening displacement[J]. Journal of Hydraulic Engineering,1989,20(4):33-44.(in Chinese))
[27]吴智敏,徐世烺,刘佳毅.光弹贴片法研究混凝土裂缝扩展过程及双K断裂参数的尺寸效应[J].水利学报,2001,32(4):34-39.(WU Zhimin,XU Shilang,LIU Jiayi. Study on crack propagation process of concrete and size effect of double-K fracture parameter by means of photo elastic coatings[J]. Journal of Hydraulic Engineering,2001,32(4):34-39.(in Chinese))
[28]高淑玲,徐世烺.电测法确定混凝土裂缝的临界长度[J].清华大学学报(自然科学版),2007,47(9):1432-1434.(GAO Shuling,XU Shilang. Critical concrete crack length determination using strain gauges[J].Journal of Tsinghua University,Science and Technology,2007,47(9):1432-1434.(in Chinese))
[29]吴智敏,徐世烺,丁一宁,等.砼非标准三点弯曲梁试件双K断裂参数[J].中国工程科学,2001,3(4):76-81.(WU Zhimin,XU Shilang,DING Yining,et al. The double-K fracture parameter of concrete for non-standard three point bending beam specimens[J]. Engineering Science,2001,3(4):76-81.(in Chinese))
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