低温硫酸盐侵蚀下水泥砂浆抗折强度预测模型
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摘要
为了进一步揭示低温硫酸盐侵蚀条件下水泥砂浆抗折强度的发展规律,本文以不同配合比砂浆试件为研究对象,进行了20℃、10℃、5℃条件下的硫酸盐侵蚀试验,并对不同龄期的抗折强度进行了测试。试验结果表明:侵蚀过程中砂浆试件抗折强度呈现出先上升后下降的变化趋势,且明显受到温度影响,温度越低,侵蚀情况越严重,主要表现为整体强度下降,上升段可达到的最大值减小,劣化开始的时间提前。为考虑温度的影响,在Irassar模型的基础上,引入温度修正系数,提出了低温硫酸盐侵蚀过程中抗折强度的预测模型。模型的计算值与实测值吻合度更高,最大误差为9%,平均误差为2.3%,故该模型可较为准确的预测水泥砂浆在5～20℃硫酸盐腐蚀环境下抗折强度的发展规律。
In order to investigate the developing law of flexural strength of cement mortar under sulfate corrosion circumstances with low temperature,the sulfate corrosion tests were carried out under temperature of 20℃,10℃and 5℃,and the flexural strength of cement mortar under different ages was also tested.The results show that the flexural strength of mortar specimens increases rapidly first and then decreases,and it is obviously affected by the temperature.The lower the temperature is,the more serious the erosion is,which is mainly manifested by the decrease of the overall strength and the maximum value of the ascending segment decrease,and the beginning time of deterioration becomes earlier.Based on the Irassar model,aprediction model of flexural strength was proposed under sulfate corrosion circumstance at low temperature.The calculated value by the presented model is more consistent with the measured value than the existing model,and the maximum error is 9% and the average error is 2.3%.Therefore,it can be concluded that the proposed model can accurately predict the variation of the flexural strength for cement mortar under sulfate corrosion at a temperature range of 5-20℃.
In order to investigate the developing law of flexural strength of cement mortar under sulfate corrosion circumstances with low temperature,the sulfate corrosion tests were carried out under temperature of 20℃,10℃and 5℃,and the flexural strength of cement mortar under different ages was also tested.The results show that the flexural strength of mortar specimens increases rapidly first and then decreases,and it is obviously affected by the temperature.The lower the temperature is,the more serious the erosion is,which is mainly manifested by the decrease of the overall strength and the maximum value of the ascending segment decrease,and the beginning time of deterioration becomes earlier.Based on the Irassar model,aprediction model of flexural strength was proposed under sulfate corrosion circumstance at low temperature.The calculated value by the presented model is more consistent with the measured value than the existing model,and the maximum error is 9% and the average error is 2.3%.Therefore,it can be concluded that the proposed model can accurately predict the variation of the flexural strength for cement mortar under sulfate corrosion at a temperature range of 5-20℃.
引文
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[20]宋远明,钱觉时,王智.燃煤灰渣火山灰反应活性[J].硅酸盐学报,2006,34(08):962-965.SONG Yuanming,QIAN Jueshi,WANG Zhi.Pozzolanic reactivity of coal ashes[J].Journal of the Chinese Ceramic Society,2006,34(08):962-965(in Chinese).
[21]李响,阿茹罕,阎培渝.水泥-粉煤灰复合胶凝材料水化程度的研究[J].建筑材料学报,2010,13(05):584-588.LI Xiang,A Ruhan,YAN Peiyu.Research on hydration degree of cement-fly ash complex binders[J].Journal of Building Materials,2010,13(05):584-588(in Chinese).
[22]李华,孙伟,左晓宝.矿物掺合料改善水泥基材料抗硫酸盐侵蚀性能的微观分析[J].硅酸盐学报,2012,40(8):1119-1126.LI Hua,SUN Wei,ZUO Xiaobao.Effect of mineral admixtures on sulfate attack resistance of cement-based materials[J].Journal of the Chinese Ceramic Society,2012,40(8):1119-1126(in Chinese).
[23]高小建,马保国,邓卫红.胶凝材料组成对混凝土TSA硫酸盐侵蚀的影响[J].哈尔滨工业大学学报,2007,39(10):1554.GAO Xiaojian,MA Baoguo,DENG Weihong.Influence of binder composition on the thaumasite form of sulfate attack of concrete[J].Journal of Harbin Institute of Technology,2007,39(10):1554(in Chinese).
[24]冯瑞玲,蔡晓宇,吴立坚,等.硫酸盐渍土水-盐-热-力四场耦合理论模型[J].中国公路学报,2017,30(02):1-10,40.FENG Ruiling,CAI Xiaoyu,WU Lijian,et al.Theoretical model on coupling process of moisture-salt-heat stress field in sulfate salty soil[J].China Journal of Highway and Transport,2017,30(02):1-10,40(in Chinese).
[25]李士伟,王迎飞,王胜年.硫酸盐环境下混凝土损伤预测模型[J].武汉理工大学学报,2010,32(14):35-39,44.LI Shiwei,WANG Yingfei,WANG Shengnian.Research onthe prediction model of the concrete damage in the sulfate aggressive environment[J].Journal of Wuhan University of Technology,2010,32(14):35-39,44(in Chinese).
[26]张英姿,范颖芳,赵颖华.受盐酸腐蚀混凝土抗压强度的灰色预测模型[J].建筑材料学报,2007(04):397-401.ZHANG Yingzi,FAN Yingfang,ZHAO Yinghua.Grey prediction model for compressive strength of concrete corroded by hydrochloric acid[J].Journal of Building Materials,2007(04):397-401(in Chinese).
[27]刘鑫,刘伟庆,王曙光,等.混凝土硫酸盐侵蚀理论模型的研究现状及展望[J].材料导报,2014,28(13):89-95,100.LIU Xin,LIU Weiqing,WANG Shuguang,et al.Recent development on theoretical models of sulfate attack on concrete[J].Materials Review,2014,28(13):89-95,100(in Chinese).
[28]IRASSAR E F.Sulfate resistance of blended cement:Prediction and relation with flexural strength[J].Cement&Concrete Research,1990,20(2):209-218.
[29]SOLACOLU C,FACAOARU I,SOLACOLU I.Modèlemathématique pour la corrosion sulfatique des mortiers[J].MatériauxEt Construction,1976,9(1):65-72.
[2]KAKALI G,PERRAKI T,TSIVILIS S,et al.Thermal treatment of kaolin:The effect of mineralogy on the pozzolanic activity[J].Applied Clay Science,2001,20(1):73-80.
[3]杨礼明,余红发,麻海燕,等.混凝土在碳化和干湿循环作用下的抗硫酸盐腐蚀性能[J].复合材料学报,2012,29(5):127-133.YANG Liming,YU Hongfa,MA Haiyan,et al.Resistance of concrete to magnesium sulfate attack under combined action of carbonation and dry-wet cycles[J].Acta Materiae Compositae Sinica,2012,29(5):127-133(in Chinese).
[4]刘赞群,邓德华,Geert DE SCHUTTER,等.“混凝土硫酸盐结晶破坏”微观分析(Ⅰ)---水泥净浆[J].硅酸盐学报,2012,02:186-193.LIU Zanqun,DENG Dehua,Geert DE SCHUTTER,et al.Micro-analysis of“Sulfate salt weathering distress on concrete”(I)-Cement paste[J].Journal of the Chinese Ceramic Society,2012,02:186-193(in Chinese).
[5]郭进军,杨梦,陈红莉,等.干湿循环下改性混凝土硫酸盐腐蚀的断裂性能试验研究[J].水利学报,2018,49(04):419-427.GUO Jinjun,YANG Meng,CHEN Hongli,et al.Experiment study on fracture properties of modified concreteattacked by sulfate corrosion under dry-wet circulation[J].Journal of Hydraulic Engineering,2018,49(04):419-427(in Chinese).
[6]刘娟红,赵力,纪洪广.初始损伤对混凝土硫酸盐腐蚀劣化性能的影响[J].工程科学学报,2017,39(08):1278-1287.LIU Juanhong,ZHAO Li,JI Hongguang.Influence of initial damage on degradation and deterioration of concrete under sulfate attack[J].Chinese Journal of Engineering,2017,39(08):1278-1287(in Chinese).
[7]肖佳,勾成福,许彩云.碳硫硅钙石型硫酸盐侵蚀[J].材料导报,2011,25(1):132-137.XIAO Jia,GOU Chengfu,XU Caiyun.Thaumasite form of sulfate attack[J].Materials Review,2011,25(1):132-137(in Chinese).
[8]邓德华,肖佳,元强,等.水泥基材料中的碳硫硅钙石[J].建筑材料学报,2005,8(4):400-409.DENG Dehua,XIAO Jia,YUAN Qiang,et al.On thaumasite in cementitious materials[J].Journal of Building of Materials,2005,8(4):400-409(in Chinese).
[9]杨长辉,刘本万,向晓斌,等.碱矿渣水泥石抗碳硫硅钙石型硫酸盐腐蚀性能[J].建筑材料学报,2015,18(1):44-48.YANG Changhui,LIU Benwan,XIANG Xiaobin,et al.Resistance of alkali-activated slag cement to thaumasite sulfate attack[J].Journal of Building of Materials,2015,18(1):44-48(in Chinese).
[10]刘超,马忠诚,刘浩云.水泥混凝土硫酸盐侵蚀综述[J].材料导报,2013,27(4):67-71.LIU Chao,MA Zhongcheng,LIU Haoyun.An overview on sulfate corrosion of cement concrete[J].Materials Review,2013,27(4):67-71(in Chinese).
[11]高礼雄,姚燕,王玲.温度对碳硫硅钙石形成的影响[J].硅酸盐学报,2005(04):525-527.GAO Lixiong,YAO Yan,WANG Ling.Effects of temperatures on thaumasite formation[J].Journal of the Chinese Ceramic Society,2005(04):525-527(in Chinese).
[12]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 dry and wet cycles[J].China Civil Engineering Journal,2010,43(2):48-54(in Chinese).
[13]SANTHANAM M,COHEN M D,OLEK J.Mechanisms of sulfate attack:A fresh look Part ll:Proposed mechanisms[J].Cement and Concrete Research,2003,33(3):341-346.
[14]中国国家标准化管理委员会.水泥抗硫酸盐侵蚀试验方法:GB/T 749-2008[S].北京:中国标准出版社,2008.Standardization Administration of the People’s Republic of China.Test method for determing capability of resisting sulfate corrode of cement:GB/T 749-2008[S].Beijing:China Standards Press,2008(in Chinese).
[15]高礼雄,杜雪刚,孔丽娟.碳硫硅钙石形成机制的定量分析[J].硅酸盐学报,2012,40(05):711-714.GAO Lixiong,DU Xuegang,KONG Lijuan.Quantitative analysis on formation mechanism of thaumasite[J].Journal of the Chinese Ceramic Society,2012,40(05):711-714(in Chinese).
[16]COLLEPARDI M.A state of the art review on delayed ettringite attack on concrete[J].Cement&Concrete Composites,2003,25(4):401-407.
[17]熊蓉蓉,龙广成,谢友均,等.矿物掺合料对蒸养高强浆体抗压强度及孔结构的影响[J].硅酸盐学报,2017,45(02):175-181.XIONG Rongrong,LONG Guangcheng,XIE Youjun,et al.Influence of mineral admixtures on compressive strength and pore structure of steam-cured high-strength cement paste[J].Journal of the Chinese Ceramic Society,2017,45(02):175-181(in Chinese).
[18]李永强,巴明芳,柳俊哲,等.干湿循环作用下水泥基复合材料抗氯离子侵蚀性能及其微观结构变化[J].复合材料学报,2017,34(12):2856-2865.LI Yongqiang,BA Mingfang,LIU Junzhe,et al.Resistance to chloride erosion of cement matrix composite materials under dry-wet cycling and their micro-structural changes[J].Acta Materiae Compositae Sinica,2017,34(12):2856-2865(in Chinese).
[19]徐世烺,蔡新华.超高韧性水泥基复合材料碳化与渗透性能试验研究[J].复合材料学报,2010,27(3):177-183.XU Shiliang,CAI Xinhua.Experimental studies on permeability and carbonation properties of ultra high toughness cementitious composites[J].Acta Materiae Compositae Sinica,2010,27(3):177-183(in Chinese).
[20]宋远明,钱觉时,王智.燃煤灰渣火山灰反应活性[J].硅酸盐学报,2006,34(08):962-965.SONG Yuanming,QIAN Jueshi,WANG Zhi.Pozzolanic reactivity of coal ashes[J].Journal of the Chinese Ceramic Society,2006,34(08):962-965(in Chinese).
[21]李响,阿茹罕,阎培渝.水泥-粉煤灰复合胶凝材料水化程度的研究[J].建筑材料学报,2010,13(05):584-588.LI Xiang,A Ruhan,YAN Peiyu.Research on hydration degree of cement-fly ash complex binders[J].Journal of Building Materials,2010,13(05):584-588(in Chinese).
[22]李华,孙伟,左晓宝.矿物掺合料改善水泥基材料抗硫酸盐侵蚀性能的微观分析[J].硅酸盐学报,2012,40(8):1119-1126.LI Hua,SUN Wei,ZUO Xiaobao.Effect of mineral admixtures on sulfate attack resistance of cement-based materials[J].Journal of the Chinese Ceramic Society,2012,40(8):1119-1126(in Chinese).
[23]高小建,马保国,邓卫红.胶凝材料组成对混凝土TSA硫酸盐侵蚀的影响[J].哈尔滨工业大学学报,2007,39(10):1554.GAO Xiaojian,MA Baoguo,DENG Weihong.Influence of binder composition on the thaumasite form of sulfate attack of concrete[J].Journal of Harbin Institute of Technology,2007,39(10):1554(in Chinese).
[24]冯瑞玲,蔡晓宇,吴立坚,等.硫酸盐渍土水-盐-热-力四场耦合理论模型[J].中国公路学报,2017,30(02):1-10,40.FENG Ruiling,CAI Xiaoyu,WU Lijian,et al.Theoretical model on coupling process of moisture-salt-heat stress field in sulfate salty soil[J].China Journal of Highway and Transport,2017,30(02):1-10,40(in Chinese).
[25]李士伟,王迎飞,王胜年.硫酸盐环境下混凝土损伤预测模型[J].武汉理工大学学报,2010,32(14):35-39,44.LI Shiwei,WANG Yingfei,WANG Shengnian.Research onthe prediction model of the concrete damage in the sulfate aggressive environment[J].Journal of Wuhan University of Technology,2010,32(14):35-39,44(in Chinese).
[26]张英姿,范颖芳,赵颖华.受盐酸腐蚀混凝土抗压强度的灰色预测模型[J].建筑材料学报,2007(04):397-401.ZHANG Yingzi,FAN Yingfang,ZHAO Yinghua.Grey prediction model for compressive strength of concrete corroded by hydrochloric acid[J].Journal of Building Materials,2007(04):397-401(in Chinese).
[27]刘鑫,刘伟庆,王曙光,等.混凝土硫酸盐侵蚀理论模型的研究现状及展望[J].材料导报,2014,28(13):89-95,100.LIU Xin,LIU Weiqing,WANG Shuguang,et al.Recent development on theoretical models of sulfate attack on concrete[J].Materials Review,2014,28(13):89-95,100(in Chinese).
[28]IRASSAR E F.Sulfate resistance of blended cement:Prediction and relation with flexural strength[J].Cement&Concrete Research,1990,20(2):209-218.
[29]SOLACOLU C,FACAOARU I,SOLACOLU I.Modèlemathématique pour la corrosion sulfatique des mortiers[J].MatériauxEt Construction,1976,9(1):65-72.
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