桥梁伸缩装置锚固区混杂纤维混凝土力学性能及抗冻性试验研究
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摘要
为了延长桥梁伸缩装置锚固区混凝土的使用寿命,减少维修次数,本文通过试验研究了混杂纤维混凝土早期力学性能及抗冻性。首先分析了混杂纤维混凝土的混杂机理;随后制作了38组混杂纤维混凝土试件,试验中2种纤维按照不同的体积掺量掺入混凝土中,并进行了抗压强度、抗折强度和抗冻性试验;最后,计算了混杂效应,确定了最优的纤维体积掺量。结果表明:钢纤维体积掺量为1.5%与聚乙烯醇纤维体积掺量为0.12%时,混杂纤维混凝土表现出较好的效果,1 d和3 d立方体抗压强度提高了30.9%和31.7%,1 d和3 d抗折强度提高了81.4%和65.5%,50次冻融循环后强度损失率为2.5%,质量损失率为0.6%。本文的研究结果可用于公路桥梁伸缩装置新建工程和维修更换中,有较强的工程应用价值。
To increase the service life of concrete in anchorage zone of bridge expansion device and reduce the maintenance times,the mechanical properties at early stage and frost resistance of hybrid fiber concrete were studied. Firstly,the mechanism of hybrid fiber concrete was analyzed. Secondly,38 groups of hybrid fiber concrete specimens were prepared,in which two fibers were added with different volume fractions,followed with the investigation of compressive strength,rupture strength and frost resistance. Finally,the hybrid effects were calculated and the optimal fiber volume fraction was acquired. The results demonstrate that hybrid fiber concrete shows best performance when a 1.5% volume fraction of steel fiber and a 0.12% volume fraction of polyvinyl alcohol fiber are added. Its compressive strengths increase by 30.9% and 31.7%,rupture strengths increase by 81.4% and 65.5% respectively for 1 d and 3 d specimens. After 50 freeze-thaw cycles,the strength loss rate is 2.5% and the mass loss rate is 0.6%. These results have great engineering application values in new projects or maintenance and replacement works of highway expansion devices.
To increase the service life of concrete in anchorage zone of bridge expansion device and reduce the maintenance times,the mechanical properties at early stage and frost resistance of hybrid fiber concrete were studied. Firstly,the mechanism of hybrid fiber concrete was analyzed. Secondly,38 groups of hybrid fiber concrete specimens were prepared,in which two fibers were added with different volume fractions,followed with the investigation of compressive strength,rupture strength and frost resistance. Finally,the hybrid effects were calculated and the optimal fiber volume fraction was acquired. The results demonstrate that hybrid fiber concrete shows best performance when a 1.5% volume fraction of steel fiber and a 0.12% volume fraction of polyvinyl alcohol fiber are added. Its compressive strengths increase by 30.9% and 31.7%,rupture strengths increase by 81.4% and 65.5% respectively for 1 d and 3 d specimens. After 50 freeze-thaw cycles,the strength loss rate is 2.5% and the mass loss rate is 0.6%. These results have great engineering application values in new projects or maintenance and replacement works of highway expansion devices.
引文
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[2]张海涛.高速公路桥梁伸缩缝病害原因分析和快速维修更换工艺[J].交通标准化,2012(2):123-125.
[3]李锴.桥梁伸缩缝的施工技术及病害防治措施[J].黑龙江科技信息,2015(34):207-207.
[4]张征,吴琼超.桥梁结构伸缩缝病害的成因与防治策略[J].中国多媒体与网络教学学报(中旬刊),2018(9):125-126.
[5]徐至钧.纤维混凝土技术及应用[M].北京:中国建筑工业出版社,2003.
[6] PRISCOM D,PLIZZARI G,VANDEWALLE L. Fibre reinforced concrete:new design perspectives[J].Materials&Structures,2009,42(9):1261-1281.
[7]陈猛,白帅,张海鹏,等.混杂纤维混凝土抗压和抗拉性能试验研究[J].武汉理工大学学报,2014,36(10):113-117.
[8]黄国栋,马芹永.混杂纤维混凝土力学性能试验研究与分析[J].地下空间与工程学报,2010,6(2):329-333,340.
[9]权长青,焦楚杰,杨云英,等.混杂纤维混凝土力学性能的正交试验研究[J/OL].建筑材料学报(2019-01-03)[2019-03-01]. http://kns.cnki.net/kcms/detail/31.1764.TU.20181229.1510.088.html.
[10]者亚雷,侯克鹏,杨志全,等.钢纤维混凝土破坏机理及力学性能试验[J].矿产综合利用,2015(3):78-80.
[11]中华人民共和国住房和城乡建设部,中国建设科学研究院.普通混凝土配合比设计规程:JGJ 55-2011[S].北京:中国建筑工业出版社,2011.
[12]中国工程建设标准化协会混凝土结构专业委员会.高性能混凝土应用技术规程:CECS 207:2006[S].北京:中国计划出版社,2006.
[13]中华人民共和国住房和城乡建设部,中国建设科学研究院.纤维混凝土应用技术规程:JGJ/T221-2010[S].北京:中国建筑工业出版社,2011.
[14]吴科如,张雄.土木工程材料[M].上海:同济大学出版社,2008.
[15]罗相杰,刘伟.土木工程材料试验[M].北京:北京理工大学出版社,2012.