无机聚合物混凝土与钢筋高温黏结性能试验研究
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摘要
通过无机聚合物混凝土与钢筋高温黏结性能试验,分析无机聚合物混凝土抗压与抗拉强度、相对保护层厚度、钢筋黏结长度等因素对无机聚合物混凝土与钢筋高温黏结性能的影响,并与普通混凝土-钢筋高温黏结性能进行了对比。试验结果表明:无机聚合物混凝土与钢筋的高温黏结性能优于普通混凝土;无机聚合物混凝土与钢筋的黏结强度高温退化规律与抗压抗拉强度退化规律基本一致,在400℃以下黏结强度下降20%以内,400℃后加剧下降,到800℃后仅残余10%左右;相对保护层厚度越小,无机聚合物混凝土与钢筋黏结强度高温退化越剧烈;黏结长度对黏结强度高温退化规律影响不大,但影响常温下无机聚合物混凝土与钢筋的黏结强度;通过对试验结果进行回归分析,拟合得到无机聚合物混凝土与钢筋的高温黏结强度计算式以及黏结-滑移本构模型。
Based on the test of bonding behavior between inorganic polymer concrete and rebar subjected to high temperature,the paper compared the bonding behavior of inorganic polymer concrete subjected to high temperature with ordinary concrete and study the influence of compressive strength and tensile strength,relative thickness of the inorganic polymer concrete covers,bond length on bonding behavior between inorganic polymer concrete and rebar subjected to high temperature. The test results showed that bonding behavior between inorganic polymer concrete and rebar subjected to high temperature was better than that of ordinary concrete and rebar. The degradation law of bond strength between inorganic polymer concrete and rebar after high temperature was the same with compressive strength and tensile strength. The bond strength decreased within 20% below 400 ℃. It fell faster after 400 ℃ and only about10% of the residual after 800 ℃. The smaller the relative thickness of the inorganic polymer concrete covers were,the faster the degradation of bond strength was. Bond length had little effect on degradation rule of bond strength,but had impact on bond strength at normal temperature. Through the regression analysis of the test results,the formula for the bond strength of inorganic polymer concrete and rebar subjected to high temperature was proposed,and the bond-slip constitutive model was obtained.
Based on the test of bonding behavior between inorganic polymer concrete and rebar subjected to high temperature,the paper compared the bonding behavior of inorganic polymer concrete subjected to high temperature with ordinary concrete and study the influence of compressive strength and tensile strength,relative thickness of the inorganic polymer concrete covers,bond length on bonding behavior between inorganic polymer concrete and rebar subjected to high temperature. The test results showed that bonding behavior between inorganic polymer concrete and rebar subjected to high temperature was better than that of ordinary concrete and rebar. The degradation law of bond strength between inorganic polymer concrete and rebar after high temperature was the same with compressive strength and tensile strength. The bond strength decreased within 20% below 400 ℃. It fell faster after 400 ℃ and only about10% of the residual after 800 ℃. The smaller the relative thickness of the inorganic polymer concrete covers were,the faster the degradation of bond strength was. Bond length had little effect on degradation rule of bond strength,but had impact on bond strength at normal temperature. Through the regression analysis of the test results,the formula for the bond strength of inorganic polymer concrete and rebar subjected to high temperature was proposed,and the bond-slip constitutive model was obtained.
引文
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[20]中华人民共和国国家质量监督检验检疫总局,中国管理化标准委员会.工业硅酸钠:GB/T 4209-2008[S].北京:中国标准出版社,2008.
[21]HAND B S.Bond Strength Improvement of Reinforcing Bars with Specially Designed Rib Geometries[J].ACI Materials Journal,1995,92(6):579-590.
[22]XIAO J Z,FALKER H.Bond Behavior Between Recycled Aggregate Concrete and Steel Rebars[J].Construction and Building Materials,2007,21(2):395,401.
[2]周新刚,吴江龙.高温后混凝土与钢筋黏结性能的试验研究[J].建筑结构,2012,31(9):19-24.
[3]过镇海.高温下钢筋混凝土受力性能的试验研究[J].土木工程学报,2000,33(6):7-8.
[4]吴昊,陈礼刚.高温后钢筋混凝土黏结性能试验研究[J].工业建筑,2010,40(5):9-12.
[5]谢狄敏,钱在兹.高温作用后混凝土抗拉强度与黏结强度的试验研究[J].浙江大学学报(自然科学版),1998,32(5):78-85.
[6]朱伯龙,陆洲导,胡克旭.高温(火灾)下混凝土与钢筋的本构关系[J].四川建筑科学研究,1990,17(1):37-43.
[7]张凤维.钢筋与混凝土高温黏结性能研究[D].长沙:中南大学,2008.
[8]NG T S,VOO Y L,FOSTER S J.Sustainability with UltrahighPerformance and Geopolymer Concrete Construction[C]∥Innovative Materials and Techniques in Concrete Construction:ACES Workshop.Dordrecht:Springer,2012:81-100.
[9]付亚伟,黄命辉,崔云长.新型绿色无机聚合物道面混凝土性能与应用研究[J].中国材料科技与设备,2014(3):36-39.
[10]曹定国.快凝早强无机聚合物混凝土研究及应用[M].北京:科学出版社,2015.
[11]王志坤,许金余,范建设,等.温度、应变率对地质聚合物混凝土抗压强度的影响[J].振动与冲击,2014,33(17):197-202.
[12]SOFI M,VAN D,J S J,MENDIS P A,et al.Bond Performance of Reinforcing Bars in Inorganic Polymer Concrete(IPC)[J].Journal of Material Science,2007,42:3107-3116.
[13]PRABIR K S.Bond Strength of Reinforcing Steel Embedded in Fly Ash-Based Geopolymer Concrete[J].Materials and Structures,2011,44:1021-1030.
[14]袁晓辉,卢哲安,范小春.无机聚合物混凝土-钢筋拉拔试验研究[J].武汉理工大学学报,2013,35(6):117-122.
[15]张海燕,闫佳,吴波.地聚物混凝土与钢筋黏结性能研究[J].土木工程学报,2016,49(7):107-115.
[16]中华人民共和国住房和城乡建设部.混凝土结构试验方法标准:GB/T 50152-2012[S].北京:中国建筑工业出版社,2012.
[17]中华人民共和国水利部.水工混凝土试验规程:SL 352-2006[S].北京:中国水利水电出版社,2006.
[18]刘国粹,陈辉国,钟庭,等.钢筋-无机聚合物混凝土高温黏结试验方法优选研究[J].后勤工程学院学报,2017,33(1):16-20
[19]杜江.方钢管无机聚合物混凝土柱力学性能试验研究[D].重庆:后勤工程学院,2016:26-28.
[20]中华人民共和国国家质量监督检验检疫总局,中国管理化标准委员会.工业硅酸钠:GB/T 4209-2008[S].北京:中国标准出版社,2008.
[21]HAND B S.Bond Strength Improvement of Reinforcing Bars with Specially Designed Rib Geometries[J].ACI Materials Journal,1995,92(6):579-590.
[22]XIAO J Z,FALKER H.Bond Behavior Between Recycled Aggregate Concrete and Steel Rebars[J].Construction and Building Materials,2007,21(2):395,401.