不同条件下的水泥基材料自然自愈合性能研究
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摘要
以普通硅酸盐水泥砂浆作为研究对象,综合考虑了水泥细度、水灰比、外部荷载加压、预制裂缝龄期等因素,采用裂缝宽度恢复率和强度恢复率的表征方法,对砂浆试块裂缝自然自愈合性能进行了试验研究。试验结果表明:试块裂缝在加压条件下比自由条件下的自愈合能力明显更好,试块养护180 d后,前者裂缝宽度愈合率可达到90.8%,而后者只有55.4%;试块在养护14 d后预制裂缝比养护28 d后预制裂缝的自然自愈合效果更好;此外,随着水泥细度的增加以及水灰比的增大,试块裂缝的自愈合能力均逐渐降低。
The self-healing properties of ordinary Portland cement mortar are evaluated by an experimental approach.The influences of various technical conditions are considered, such as fineness of cement, W/C, compressive constrain and pre-cracking age. Some indicative indices, such as closure ratio of crack width and strength restoring ratio, are used for the evaluation. Some conclusions can be briefly drawn as follows: compressive constrain can significantly promote the self-healing phenomenon, after 180 d of curing, the crack width restoring ratio of the former is 90.8%, while that of the latter is only 55.4%; the curing age of pre-cracking is also sensitive for the self-healing performance, specimen at 14 d is better than one at 28 d; with increasing of cement fineness and W/C, autogenous self-healing capacity of crack is reduced.
The self-healing properties of ordinary Portland cement mortar are evaluated by an experimental approach.The influences of various technical conditions are considered, such as fineness of cement, W/C, compressive constrain and pre-cracking age. Some indicative indices, such as closure ratio of crack width and strength restoring ratio, are used for the evaluation. Some conclusions can be briefly drawn as follows: compressive constrain can significantly promote the self-healing phenomenon, after 180 d of curing, the crack width restoring ratio of the former is 90.8%, while that of the latter is only 55.4%; the curing age of pre-cracking is also sensitive for the self-healing performance, specimen at 14 d is better than one at 28 d; with increasing of cement fineness and W/C, autogenous self-healing capacity of crack is reduced.
引文
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[15]梁瑞华,张磊,寇宵,等.不同细度水泥的水化特性及其对水泥砂浆自愈合性能的影响[J].硅酸盐通报,2017,36(6):2122-2127.
[16]He H.Computational modelling of particle packing in concrete.PhD dissertation,Delft University of Technology[D].The Netherlands,2010.
[2]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.
[3]Zhao S.Durability Assessment of Concrete Bridge in Marine Environment[J].Journal of Highway and Transportation Research and Development,2009,26(8):110-114.
[4]肖国庆,张军战.材料物理性能[M].北京:中国建材工业出版社,2005:85-87.
[5]刘素瑞,杨久俊,王战忠,等.碳酸钠溶液环境下混凝土自愈合性能研究[J].混凝土与水泥制品,2015(6):1-5.
[6]吕忠,陈惠苏.水泥基材料裂缝自主愈合研究进展[J].硅酸盐学报,2014,42(2):156-168.
[7]曾俊杰,范志宏,熊建波,等.混凝土裂缝渗透结晶自愈合评价方法研究[J].硅酸盐通报,2015,34(10):3051-3055+3062.
[8]ASbrams D A.Autogenous healing of concrete[J].Concrete,1925,27:10-50.
[9]刘颖,胡传斯,陈忠江,等.材料自愈合途径[J].北京工业大学学报,1998,24(2):108-110.
[10]刘承超.自修复混凝土的工作机理及试验研究[D].福州:福州大学,2005.
[11]刘素瑞,杨久俊,王战忠,等.混凝土自愈合能力环境影响因素研究进展[J].硅酸盐通报,2015,34(10):2851-2856.
[12]Clear C A.The effects of autogenous healing upon the leakage of water through cracks in concrete[C].Wexham Springs1985,Technical Report 559,CCA.
[13]AHN T H.Development of self-healing concrete incorporating geo-materials:a study on its mechanism and behavior in cracked concrete.PhD dissertation,Department of Civil Engineering[D].Tokyo:The University of Tokyo,2008.
[14]姚武,钟文慧.混凝土损伤自愈的机理[J].材料研究学报,2006(1):24-28.
[15]梁瑞华,张磊,寇宵,等.不同细度水泥的水化特性及其对水泥砂浆自愈合性能的影响[J].硅酸盐通报,2017,36(6):2122-2127.
[16]He H.Computational modelling of particle packing in concrete.PhD dissertation,Delft University of Technology[D].The Netherlands,2010.