不同化学溶液和冻融循环作用下砂浆力学特征的研究
|
摘要
通过对不同化学溶液和冻融循环共同作用下砂浆物理力学特性进行室内试验,研究了溶液的酸碱性、浓度和化学成分对砂浆化学冻融损伤劣化程度的影响,进一步分析了化学冻融后试样物理力学特性的变化规律,并对不同化学溶液下砂浆的冻融损伤劣化机理进行了探讨。试验结果表明:溶液酸性越强,砂浆物理力学参数的冻融损伤劣化程度越大;冻融初期,碱性NaOH溶液抑制了砂浆的损伤劣化的程度,但随着冻融循环次数的增加,这种抑制作用逐渐消失。相同条件下,Na_2SO_4溶液加剧了砂浆的冻融损伤程度。试样抗折强度的化学冻融损伤劣化程度相对于其抗压强度要严重得多;同时,基于化学冻融前后砂浆的孔隙率建立损伤变量,来定量地描述砂浆化学冻融损伤的劣化程度。
Physical and mechanical characteristics of mortar subjected to the combined action of different chemical solutions and freezing-thawing cycles(F-T cycles) were experimentally studied. The effect of acidity and alkaline, concentration and chemical composition of solution on the deterioration degree of chemical freezing-thawing damage of mortar were studied. The variation pattern of physical and mechanical characteristics of samples after chemical freezing and thawing was further analyzed, and the damage deterioration mechanism of mortar in different chemical solutions was discussed. Experimental results show the stronger the solution acidity is, the greater the deterioration degree of freezing-thawing damage of mortar physical and mechanical parameters. At the beginning of experiment, alkaline NaOH solutions inhibits the freezing and thawing damage of mortar to some extent, but with the increase of freezing-thawing cycles, the inhibition gradually disappeared. Under the same conditions, Na_2SO_4 solution increased the damage degree of mortar specimens. Deterioration degree of flexural strength is much more severe than that of the compressive strength under the same conditions. The damage variable based on the porosity of mortar specimens before and after chemical and freeze-thawing is established to quantitatively describe the degradation degree of mortar specimens.
Physical and mechanical characteristics of mortar subjected to the combined action of different chemical solutions and freezing-thawing cycles(F-T cycles) were experimentally studied. The effect of acidity and alkaline, concentration and chemical composition of solution on the deterioration degree of chemical freezing-thawing damage of mortar were studied. The variation pattern of physical and mechanical characteristics of samples after chemical freezing and thawing was further analyzed, and the damage deterioration mechanism of mortar in different chemical solutions was discussed. Experimental results show the stronger the solution acidity is, the greater the deterioration degree of freezing-thawing damage of mortar physical and mechanical parameters. At the beginning of experiment, alkaline NaOH solutions inhibits the freezing and thawing damage of mortar to some extent, but with the increase of freezing-thawing cycles, the inhibition gradually disappeared. Under the same conditions, Na_2SO_4 solution increased the damage degree of mortar specimens. Deterioration degree of flexural strength is much more severe than that of the compressive strength under the same conditions. The damage variable based on the porosity of mortar specimens before and after chemical and freeze-thawing is established to quantitatively describe the degradation degree of mortar specimens.
引文
[1] Sunil Kumar,Kameswara Rao C V S.Strength loss in concrete due to varying sulfate exposures[J].Cement and Concrete Research,1995,25(1):57-62.
[2] Irassar E F,Maio A D,Batie O R.Sulfate attack on concrete with mineral mixtures[J].Cement and Concrete Research,1996,26(1):113-123.
[3] 周飞鹏.混凝土的酸雨腐蚀模型研究[D].辽宁:大连理工大学,2005 (ZHOU Feipeng.Study on acid rain corrosion model of concrete[D].Liaoning:Dalian University of Technology,2005 (in Chinese))
[4] 梁咏宁,袁迎曙.硫酸盐侵蚀环境因素对混凝土性能退化的影响[J].中国矿业大学学报,2005,34(4):452-457 (LIANG Yongning,YUAN Yingshu.Effects of environmental factors of sulfate attack on deterioration of concrete mechanical behavior[J].Journal of China University of Mining & Technology,2005,34(4):452-457 (in Chinese))
[5] Boyd A J,Mindess S.The use of tension testing to investigate the effect of W/C ratio and cement type on the resistance of concrete to sulfate attack[J].Cement and Concrete Research,2004,34(3):373-377.
[6] 汪廷秀,高建明,丁平华,等.干湿交替作用下混凝土抗硫酸盐侵蚀性能研究[J].混凝土与水泥制品,2011(2):17-21 (WANG Tingxiu,GAO Jianming,DING Pinghua,et al.Study on the resistance to sulfate attack of concrete under dry wet alternation[J].China Concrete and Cement Products,2011(2):17-21 (in Chinese))
[7] 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):48-54 (GAO Rundong,ZHAO Shunbo,LI Qingbin,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):48-54 (in Chinese))
[8] 张亚梅,陈胜霞,高岳毅.浸-烘循环作用下橡胶水泥混凝土的性能研究[J].建筑材料学报,2005,8(6):665-671 (ZHANG Yamei,CHEN Shengxia,GAO Yueyi.Study on properties of rubber included cement concrete under wet-dry cycling[J].Journal of Building Material,2005,8(6):665-671 (in Chinese))
[9] 董必钦,罗帅,邢锋.多因素作用对混凝土硫酸盐腐蚀的影响研究[J].混凝土,2007(9):33-36 (DONG Biqin,LUO Shuai,XING Feng.Study on sulfate corrosion of concrete under multiple damage factors[J].Concrete,2007(9):33-36 (in Chinese))
[10] 李金玉,曹建国,徐文雨,等.混凝土冻融破坏机理的研究[J].水利学报,1999(1):41-49 (LI Jinyu,CAO Jianguo,XU Wenyu,et al.Study on the mechanism of concrete destruction under frost action[J].Journal of Hydraulic Engineering,1999(1):41-49 (in Chinese))
[11] 覃丽坤,宋玉普,陈浩然,等.冻融循环对混凝土力学性能的影响[J].岩石力学与工程学,2005,24(增1):5048-5053 (QIN Likun,SONG Yupu,CHEN Haoran,et al.Influence of freezing and thawing cycle on mechanical properties of concrete[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(supp.1):5048-5053 (in Chinese))
[12] 金祖权,孙伟,张云升,等.混凝土在硫酸盐、氯盐溶液中的损伤过程[J].硅酸盐学报,2006,34 (5):630-635 (JIN Zuquan,SUN Wei,ZHANG Yunsheng,et al.Damage of concrete in sulfate and chloride solution[J].Journal of the Chinese Ceramic Society,2006,34(5):630-635 (in Chinese))
[13] Boyd A,Mindess S.The use of tension testing to investigate the effect of W/C ratio and cement type on the resistance of concrete to sulfate attack[J].Cement and Concrete Research,2004,34(3):373-377.
[14] Zivica V,Adolf B.Acidic attack of cement based materials-a review.part 1:Principe of acidic attack[J].Construction and Building Materials,2001,15:331-340.
[15] Zivica V,Adolf B.Acidic attack of cement-based materials-a review.part 2:Factors of rate of acidic attack and protective measures[J].Construction and Building Materials,2002,16:215-222.
[16] Zivica V,Adolf B.Acidic attack of cement base d materials-a review.part 3:Research and test methods[J].Construction and Building Materials,2004,18:683-688.
[17] Tixier R.Microstructural development and sulfate attack modeling in blended cement-based materials[D].Arizona State University,2000.
[18] 施士升.冻融循环对混凝土力学性能的影响[J].土木工程学报,1997,30(4):35-42 (SHI Shisheng.The effect of freeze-thaw cycles on the mechanism of concrete[J].China Civil Engineering Journal,1997,30(4):35-42 (in Chinese))
[19] 孙丛涛,牛荻涛.混凝土抗盐冻性能试验研究[J].硅酸盐通报,2010,29(4):762-767 (SUN Congtao,NIAN Ditao.Experimental study on frost-salt resistance of concente[J].Bulletin of the Chinese Ceramic Society,2010,29(4):762-767 (in Chinese))
[20] 谢友均,马昆林,许辉,等.混凝土在不同溶液中抗冻性能的研究[J].铁道科学与工程学报,2006,3(4):29-34 (XIE Youjun,MA Kunlin,XU Hui,et al.Research on the frost-resistant capability of concrete in different solutions[J].Journal of Railway Science and Engineering,2006,3(4):29-34 (in Chinese))
[21] 王华.海水冻融循环作用下活性粉末混凝土的耐久性研究[D].北京交通大学硕士学位论文,2014 (WANG Hua.Durability of reactive powder concrete under coupling effect of seawater and freeze-thaw cycles[D].Beijing Jiaotong University,2014 (in Chinese))
[22] 张云清,余红发,孙伟,等.MgSO4腐蚀环境作用下混凝土的抗冻性[J].建筑材料学报,2011,14(5):698-702 (ZHANG Yunqing,YU Hongfa,SUN Wei,et al.Frost resistance of concrete under action of magnesium sulfate attack[J].Journal of Building Material,2011,14(5):698-702 (in Chinese))
[23] 慕儒,缪昌文,刘加平,等.硫酸钠溶液对混凝土抗冻性的影响[J].建筑材料学报,2001,4(4):311-317 (MU Ru,MIAO Changwen,LIU Jiaping,et al.Effect of sodium sulphate solution on the frost resistance of concrete[J].Journal of Building Material,2001,4(4):311-317 (in Chinese))
[24] 肖前慧.冻融环境多因素共同作用混凝土结构耐久性研究[D].西安建筑科技大学,2010 (XIAO Qianhui.Concrete durability in freezing-thawing circumstance based on multi-factor effects[D].Xi′an University of Architecture and Technology,2010 (in Chinese))
[25] 王军强.混凝土中冻融循环和氯离子侵蚀的耦合效应试验研究[J].混凝土,2008(11):29-31 (WANG Junqiang.Experiment study on the coupled effect of freezing-thawing and chloride penetration in concrete[J].Concrete,2008(11):29-31(in Chinese))
[26] 张磊.混凝土在硫酸盐与冻融双因素作用下的复合损伤研究[D].扬州大学,2007 (ZHANG Lei.Research on the damage of concrete under the combined action of freeze-thaw cycles and sulfate attack[D].Yangzhou University,2007 (in Chinese))
[27] 占宝剑.盐水侵蚀和冻融对混凝土性能的影响研究[D].武汉理工大学,2009 (ZHAN Baojian.Study on the effects of saltwater erosion and freezing-thawing on concrete performance[D].Wuhan University of Technology,2009 (in Chinese))
[28] 张云清,余红发,孙伟,等.冻融循环作用下混凝土的硫酸盐应力腐蚀特性[J].土木建筑与环境工程,2010,32(6):147-152 (ZHANG Yunqing,YU Hongfa,SUN Wei,et al.Stress corrosion of concrete exposed to the action of freezing-thawing cycles[J].Journal of Civil,Architectural & Environmental Engineering,2010,32(6):147-152 (in Chinese))
[29] Dieterich J H,Conrad G.Effects of humidity on time and velocity dependent friction in rocks[J].Journal of Geophysical Research,1984,89:4196-4202.
[30] Feucht L J,Logan J M.Effects of chemically active solutions on shearing behavior of a sandstone[J].Tectonophysics,1990,175:159-176.
[31] 韩铁林,师俊平,陈蕴生,等.化学侵蚀后砂浆力学特性的劣化及其细观结构损伤定量化方法[J].材料研究学报,2015,29(12):921-930 (HAN Tielin,SHI Junping,CHEN Yunsheng,et al.Salt solution attack induced mechanical property degradation and quantitative analysis method for evolution of meso-structure damages of mortar[J].Chinese Journal of Materials Research,2015,29(12):921-930 (in Chinese))
[32] Karfakis M G,Askram M.Effect of chemical solutions on rock fracturing[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,1993,37(7):1253-1259.
[2] Irassar E F,Maio A D,Batie O R.Sulfate attack on concrete with mineral mixtures[J].Cement and Concrete Research,1996,26(1):113-123.
[3] 周飞鹏.混凝土的酸雨腐蚀模型研究[D].辽宁:大连理工大学,2005 (ZHOU Feipeng.Study on acid rain corrosion model of concrete[D].Liaoning:Dalian University of Technology,2005 (in Chinese))
[4] 梁咏宁,袁迎曙.硫酸盐侵蚀环境因素对混凝土性能退化的影响[J].中国矿业大学学报,2005,34(4):452-457 (LIANG Yongning,YUAN Yingshu.Effects of environmental factors of sulfate attack on deterioration of concrete mechanical behavior[J].Journal of China University of Mining & Technology,2005,34(4):452-457 (in Chinese))
[5] Boyd A J,Mindess S.The use of tension testing to investigate the effect of W/C ratio and cement type on the resistance of concrete to sulfate attack[J].Cement and Concrete Research,2004,34(3):373-377.
[6] 汪廷秀,高建明,丁平华,等.干湿交替作用下混凝土抗硫酸盐侵蚀性能研究[J].混凝土与水泥制品,2011(2):17-21 (WANG Tingxiu,GAO Jianming,DING Pinghua,et al.Study on the resistance to sulfate attack of concrete under dry wet alternation[J].China Concrete and Cement Products,2011(2):17-21 (in Chinese))
[7] 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):48-54 (GAO Rundong,ZHAO Shunbo,LI Qingbin,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):48-54 (in Chinese))
[8] 张亚梅,陈胜霞,高岳毅.浸-烘循环作用下橡胶水泥混凝土的性能研究[J].建筑材料学报,2005,8(6):665-671 (ZHANG Yamei,CHEN Shengxia,GAO Yueyi.Study on properties of rubber included cement concrete under wet-dry cycling[J].Journal of Building Material,2005,8(6):665-671 (in Chinese))
[9] 董必钦,罗帅,邢锋.多因素作用对混凝土硫酸盐腐蚀的影响研究[J].混凝土,2007(9):33-36 (DONG Biqin,LUO Shuai,XING Feng.Study on sulfate corrosion of concrete under multiple damage factors[J].Concrete,2007(9):33-36 (in Chinese))
[10] 李金玉,曹建国,徐文雨,等.混凝土冻融破坏机理的研究[J].水利学报,1999(1):41-49 (LI Jinyu,CAO Jianguo,XU Wenyu,et al.Study on the mechanism of concrete destruction under frost action[J].Journal of Hydraulic Engineering,1999(1):41-49 (in Chinese))
[11] 覃丽坤,宋玉普,陈浩然,等.冻融循环对混凝土力学性能的影响[J].岩石力学与工程学,2005,24(增1):5048-5053 (QIN Likun,SONG Yupu,CHEN Haoran,et al.Influence of freezing and thawing cycle on mechanical properties of concrete[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(supp.1):5048-5053 (in Chinese))
[12] 金祖权,孙伟,张云升,等.混凝土在硫酸盐、氯盐溶液中的损伤过程[J].硅酸盐学报,2006,34 (5):630-635 (JIN Zuquan,SUN Wei,ZHANG Yunsheng,et al.Damage of concrete in sulfate and chloride solution[J].Journal of the Chinese Ceramic Society,2006,34(5):630-635 (in Chinese))
[13] Boyd A,Mindess S.The use of tension testing to investigate the effect of W/C ratio and cement type on the resistance of concrete to sulfate attack[J].Cement and Concrete Research,2004,34(3):373-377.
[14] Zivica V,Adolf B.Acidic attack of cement based materials-a review.part 1:Principe of acidic attack[J].Construction and Building Materials,2001,15:331-340.
[15] Zivica V,Adolf B.Acidic attack of cement-based materials-a review.part 2:Factors of rate of acidic attack and protective measures[J].Construction and Building Materials,2002,16:215-222.
[16] Zivica V,Adolf B.Acidic attack of cement base d materials-a review.part 3:Research and test methods[J].Construction and Building Materials,2004,18:683-688.
[17] Tixier R.Microstructural development and sulfate attack modeling in blended cement-based materials[D].Arizona State University,2000.
[18] 施士升.冻融循环对混凝土力学性能的影响[J].土木工程学报,1997,30(4):35-42 (SHI Shisheng.The effect of freeze-thaw cycles on the mechanism of concrete[J].China Civil Engineering Journal,1997,30(4):35-42 (in Chinese))
[19] 孙丛涛,牛荻涛.混凝土抗盐冻性能试验研究[J].硅酸盐通报,2010,29(4):762-767 (SUN Congtao,NIAN Ditao.Experimental study on frost-salt resistance of concente[J].Bulletin of the Chinese Ceramic Society,2010,29(4):762-767 (in Chinese))
[20] 谢友均,马昆林,许辉,等.混凝土在不同溶液中抗冻性能的研究[J].铁道科学与工程学报,2006,3(4):29-34 (XIE Youjun,MA Kunlin,XU Hui,et al.Research on the frost-resistant capability of concrete in different solutions[J].Journal of Railway Science and Engineering,2006,3(4):29-34 (in Chinese))
[21] 王华.海水冻融循环作用下活性粉末混凝土的耐久性研究[D].北京交通大学硕士学位论文,2014 (WANG Hua.Durability of reactive powder concrete under coupling effect of seawater and freeze-thaw cycles[D].Beijing Jiaotong University,2014 (in Chinese))
[22] 张云清,余红发,孙伟,等.MgSO4腐蚀环境作用下混凝土的抗冻性[J].建筑材料学报,2011,14(5):698-702 (ZHANG Yunqing,YU Hongfa,SUN Wei,et al.Frost resistance of concrete under action of magnesium sulfate attack[J].Journal of Building Material,2011,14(5):698-702 (in Chinese))
[23] 慕儒,缪昌文,刘加平,等.硫酸钠溶液对混凝土抗冻性的影响[J].建筑材料学报,2001,4(4):311-317 (MU Ru,MIAO Changwen,LIU Jiaping,et al.Effect of sodium sulphate solution on the frost resistance of concrete[J].Journal of Building Material,2001,4(4):311-317 (in Chinese))
[24] 肖前慧.冻融环境多因素共同作用混凝土结构耐久性研究[D].西安建筑科技大学,2010 (XIAO Qianhui.Concrete durability in freezing-thawing circumstance based on multi-factor effects[D].Xi′an University of Architecture and Technology,2010 (in Chinese))
[25] 王军强.混凝土中冻融循环和氯离子侵蚀的耦合效应试验研究[J].混凝土,2008(11):29-31 (WANG Junqiang.Experiment study on the coupled effect of freezing-thawing and chloride penetration in concrete[J].Concrete,2008(11):29-31(in Chinese))
[26] 张磊.混凝土在硫酸盐与冻融双因素作用下的复合损伤研究[D].扬州大学,2007 (ZHANG Lei.Research on the damage of concrete under the combined action of freeze-thaw cycles and sulfate attack[D].Yangzhou University,2007 (in Chinese))
[27] 占宝剑.盐水侵蚀和冻融对混凝土性能的影响研究[D].武汉理工大学,2009 (ZHAN Baojian.Study on the effects of saltwater erosion and freezing-thawing on concrete performance[D].Wuhan University of Technology,2009 (in Chinese))
[28] 张云清,余红发,孙伟,等.冻融循环作用下混凝土的硫酸盐应力腐蚀特性[J].土木建筑与环境工程,2010,32(6):147-152 (ZHANG Yunqing,YU Hongfa,SUN Wei,et al.Stress corrosion of concrete exposed to the action of freezing-thawing cycles[J].Journal of Civil,Architectural & Environmental Engineering,2010,32(6):147-152 (in Chinese))
[29] Dieterich J H,Conrad G.Effects of humidity on time and velocity dependent friction in rocks[J].Journal of Geophysical Research,1984,89:4196-4202.
[30] Feucht L J,Logan J M.Effects of chemically active solutions on shearing behavior of a sandstone[J].Tectonophysics,1990,175:159-176.
[31] 韩铁林,师俊平,陈蕴生,等.化学侵蚀后砂浆力学特性的劣化及其细观结构损伤定量化方法[J].材料研究学报,2015,29(12):921-930 (HAN Tielin,SHI Junping,CHEN Yunsheng,et al.Salt solution attack induced mechanical property degradation and quantitative analysis method for evolution of meso-structure damages of mortar[J].Chinese Journal of Materials Research,2015,29(12):921-930 (in Chinese))
[32] Karfakis M G,Askram M.Effect of chemical solutions on rock fracturing[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,1993,37(7):1253-1259.