粗骨料混凝土早期热膨胀系数试验研究.pdf

第26卷第3期 结构工程师 V01．26．No．3 Structural j岫．2010 2010年6月 Engineers 不同粗骨料混凝土早期热膨胀系数试验研究 黄杰‘ 吴胜兴沈德建 (河海大学土木工程系，南京210098) 摘要混凝土早期热膨胀系数是影响混凝土早期开裂的重要参数。进行了不同粗骨料混凝土早期热 膨胀系数试验研究，得到了混凝土早期热膨胀系数随龄期变化规律。试验结果表明，混凝土的早期热膨 胀系数在实际初凝至实际终凝时快速下降，而后缓慢回升并逐渐趋于稳定；混凝土的热膨胀系数随着其 骨料热膨胀系数的增大而线性增大。提出了考虑粗骨料种类影响的混凝土早期热膨胀系数计算方法， 可供混凝土早期相关计算使用。 关键词混凝土，热膨胀系数，粗骨料，早龄期，试验 onThermal CoefficientofDifferent ExperimentalStudy Expansion Coarse Concreteat Type Aggregates EarlyAges HUANGWU SHEN Jie+ ShengxingDejian ofCivil (DepartmentEngineering，HohaiUniversity，Nanjing210098，China) AbstractThermal concreteat isall in coefficient(CET)ofages expansion early importantparameter concrete at this onCETofdifferent concrete earlyages．Inpaper，experimentalstudy typeaggregates cracking of and were resultsindicate at wascarried thenrules aboutCET ages out，and change age analysed．Test early theCET thatthecoefficientfallsdown betweenactualinitial andactual then quickly setting finallysetting，and arises and stableatlast．TestresulmalsoindicatethattheCETofconcreteincreaseswhenthe slowlykeeps CETofits thereisa linear betweenthem．Thecalculation aggregateincreases，and relationship corresponding of was