自修复混凝土修复效果影响因素的试验研究
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摘要
为探究外界环境条件、裂缝初始宽度大小、玻璃纤维管的放置方式这3种因素对内置玻璃纤维管自修复混凝土修复效果的影响,以长城717为修复胶黏剂,以玻璃纤维管为载体制备自修复混凝土试件进行自修复试验.用修复后试件的抗折强度f1与对照组试件初始抗折强度f的比值η来表征修复效果,分析了3种因素与修复效果之间的关系.结果表明:修复效果随着外界环境条件(温度)的升高而增加,在特定的玻璃纤维管放置方式和预压荷载条件下,温度为30℃时的修复效果比-15℃时的修复效果最高提高了13.3%;在一定裂缝宽度范围内,裂缝初始宽度越小,修复效果越好,自修复混凝土能够修复裂缝初始宽度为1.0mm及以下范围内的微裂缝;玻璃纤维管的放置方式为梯形时的修复效果高于放置方式为菱形时的修复效果;当裂缝初始宽度达到约2.0mm时,玻璃纤维管的放置方式对自修复效果起主导作用.
The performance of self-healing concrete can be affected by various factors.In order to explore how the factors like external environmental conditions,initial width of crack and placement method of fiberglass tubes affect the performance of self-healing concrete,the self-repairing test was conducted by using the self-healing concrete specimens with the Great Wall 717 as the repairing adhesives and the fiberglass tubes as carriers.The rateηof the flexural strength after being repaired(f1)and the initial flexural strength of the control group(f)was used to characterize the repairing performance,through which the relationship between these three factors and the performance were analyzed.Results show that the repairing effect increases as the external environmental conditions(temperature)increase,under the condition of special fiberglass tube placement method and initial width of the crack,the performance at 30℃is 13.3%higher than that at-15℃;the smaller the initial width of the crack is,the better the repairing effect will be.The microcrack with initial width of cracks of 1.0 mm or below can be repaired by the self-healing concrete.When fiberglass tube is placed in a shape of trapezoid,the performance will be better than that of the rhombus.The placement method of fiberglass tubes plays a dominant role in the self-healing process when the intial width of the crack is up to about 2.0 mm.
The performance of self-healing concrete can be affected by various factors.In order to explore how the factors like external environmental conditions,initial width of crack and placement method of fiberglass tubes affect the performance of self-healing concrete,the self-repairing test was conducted by using the self-healing concrete specimens with the Great Wall 717 as the repairing adhesives and the fiberglass tubes as carriers.The rateηof the flexural strength after being repaired(f1)and the initial flexural strength of the control group(f)was used to characterize the repairing performance,through which the relationship between these three factors and the performance were analyzed.Results show that the repairing effect increases as the external environmental conditions(temperature)increase,under the condition of special fiberglass tube placement method and initial width of the crack,the performance at 30℃is 13.3%higher than that at-15℃;the smaller the initial width of the crack is,the better the repairing effect will be.The microcrack with initial width of cracks of 1.0 mm or below can be repaired by the self-healing concrete.When fiberglass tube is placed in a shape of trapezoid,the performance will be better than that of the rhombus.The placement method of fiberglass tubes plays a dominant role in the self-healing process when the intial width of the crack is up to about 2.0 mm.
引文
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[13]程培峰,魏玉伟.自修复混凝土中胶黏剂性能的试验研究[J].科学技术与工程,2017,17(17):292-296.CHENG Peifeng,WEI Yuwei.Study on the performance of adhesive in the self-healing concrete[J].Science Technology and Engineering,2017,17(17):292-296.(in Chinese)
[14]申春丽.自修复PVA纤维混凝土的试验研究[D].重庆:重庆交通大学,2011.SHEN Chunli.The research of self-healing concrete with PVA fibers[D].Chongqing:Chongqing Jiaotong University,2011.(in Chinese)
[15]匡亚川,欧进萍.内置纤维胶液管钢筋混凝土梁裂缝自愈合行为试验和分析[J].土木工程学报,2005(4):53-59.KUANG Yachuan,OU Jinping.Experiments and analyses of the self-healing of cracks in reinforced concrete beams with embedded fibers filled with adhesive[J].China Civil Engineering Journal,2005(4):53-59.(in Chinese)
[16]成新元.仿生自修复混凝土梁的弯曲试验及分析[J].天津城市建设学院学报,2010,16(1):21-24.CHENG Xinyuan.The bending experiment and analysis of biomimetic self-repairing concrete beams[J].Journal of Tianjin Institute of Urban Construction,2010,16(1):21-24.(in Chinese)
[17]陈延国,王宪年,段红波.水泥混凝土路面温度场研究[J].公路,2002(6):72-74.CHEN Yanguo,WANG Xiannian,DUAN Hongbo.Study on temperature field of cement concrete pavement[J].Highway,2002(6):72-74.(in Chinese)
[18]王可良,郑灿堂,许尚杰.渗透结晶材料对混凝土裂缝宽度的修复性能[J].混凝土与水泥制品,2012(1):21-23.WANG Keliang,ZHENG Cantang,XU Shangjie.Performance of permeable crystalline materials for crack width of concrete[J].China Concrete and Cement Products,2012(1):21-23.(in Chinese)
[2]温伟标.水泥路面病害维修关键技术研究[D].广州:华南理工大学,2009.WEN Weibiao.Key techniques study on cement pavement maintained[D].Guangzhou:South China University of Technology,2009.(in Chinese)
[3]申爱琴.水泥混凝土路面裂缝修补材料研究[D].西安:长安大学,2005.SHEN Aiqin.Study on the crack mending materials of cement concrete pavement[D].Xi'an:Chang'an University,2005.(in Chinese)
[4]杨清宇.水泥混凝土路面裂缝修补材料研究[D].长沙:长沙理工大学,2013.YANG Qingyu.The technology research on repairing cracks of prestressed concrete pavement[D].Changsha:Changsha University of Science&Technology,2013.(in Chinese)
[5]王桂明.化学转换型裂缝自修复材料及其对混凝土耐久性的影响研究[D].武汉:武汉理工大学,2005.WANG Guiming.Studies on chemical change type self-healing material for cracks and its influence on durability of concrete[D].Wuhan:Wuhan University of Technology,2005.(in Chinese)
[6]RYU J-S,OTSUKI N.Crack closure of reinforced concrete by electro deposition technique[J].Cement and Concrete Research,2002,32(1):159-164.
[7]沼尾达弥,福尺公夫.补修剂对入にょゐ自己修复机能付加に关すゐ基础的研究[J].コンクリ-ト工学年次论文报告集,1999,21(1):145-150.
[8]习志臻,张雄.仿生自愈合水泥砂浆的研究[J].建筑材料学报,2002,5(4):390-392.XI Zhizhen,ZHANG Xiong.Bionical self-healing cement mortar[J].Journal of Building Materials,2002,5(4):390-392.(in Chinese)
[9]刘小艳,姚武,郑晓芳,等.混凝土损伤自愈合性能的试验研究[J].建筑材料学报,2005,8(2):184-188.LIU Xiaoyan,YAO Wu,ZHENG Xiaofang,et al.Experimental study on self-healing performance of concrete[J].Journal of Building Materials,2005,8(2):184-188.(in Chinese)
[10]钱春香,任立夫,罗勉.基于微生物诱导矿化的混凝土表面缺陷及裂缝修复技术研究进展[J].硅酸盐学报,2015,43(5):619-631.QIAN Chunxiang,REN Lifu,LUO Mian.Development of concrete surface defects and cracks repair technology based on microbial-induced mineralization[J].Journal of the Chinese Ceramic Society,2015,43(5):619-631.(in Chinese)
[11]陈怀成,钱春香,任立夫.基于微生物矿化技术的水泥基材料早期裂缝自修复[J].东南大学学报(自然科学版),2016,46(3):606-611.CHEN Huaicheng,QIAN Chunxiang,REN Lifu.Self-healing of early age cracks in cement-based materials based on miner-alization of microorganism[J].Journal of Southeast University(Natural Science),2016,46(3):606-611.(in Chinese)
[12]柴鹏.混凝土裂缝自愈合影响因素研究[D].武汉:长江科学院,2008.CHAI Peng.Study on effect factors of autogenous healing of concrete[D].Wuhan:Changjiang River Scientific Research Institute,2008.(in Chinese)
[13]程培峰,魏玉伟.自修复混凝土中胶黏剂性能的试验研究[J].科学技术与工程,2017,17(17):292-296.CHENG Peifeng,WEI Yuwei.Study on the performance of adhesive in the self-healing concrete[J].Science Technology and Engineering,2017,17(17):292-296.(in Chinese)
[14]申春丽.自修复PVA纤维混凝土的试验研究[D].重庆:重庆交通大学,2011.SHEN Chunli.The research of self-healing concrete with PVA fibers[D].Chongqing:Chongqing Jiaotong University,2011.(in Chinese)
[15]匡亚川,欧进萍.内置纤维胶液管钢筋混凝土梁裂缝自愈合行为试验和分析[J].土木工程学报,2005(4):53-59.KUANG Yachuan,OU Jinping.Experiments and analyses of the self-healing of cracks in reinforced concrete beams with embedded fibers filled with adhesive[J].China Civil Engineering Journal,2005(4):53-59.(in Chinese)
[16]成新元.仿生自修复混凝土梁的弯曲试验及分析[J].天津城市建设学院学报,2010,16(1):21-24.CHENG Xinyuan.The bending experiment and analysis of biomimetic self-repairing concrete beams[J].Journal of Tianjin Institute of Urban Construction,2010,16(1):21-24.(in Chinese)
[17]陈延国,王宪年,段红波.水泥混凝土路面温度场研究[J].公路,2002(6):72-74.CHEN Yanguo,WANG Xiannian,DUAN Hongbo.Study on temperature field of cement concrete pavement[J].Highway,2002(6):72-74.(in Chinese)
[18]王可良,郑灿堂,许尚杰.渗透结晶材料对混凝土裂缝宽度的修复性能[J].混凝土与水泥制品,2012(1):21-23.WANG Keliang,ZHENG Cantang,XU Shangjie.Performance of permeable crystalline materials for crack width of concrete[J].China Concrete and Cement Products,2012(1):21-23.(in Chinese)
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