矿物掺合料和养护方式对轻骨料混凝土吸水性的影响.pdfVIP

学兔兔 2014年第 4期(总第 294期 ) 混 凝 土 实 用 技 术 Number4 in 2014(Total No．294) Concrete PRACTICAL TECHN0LOGY doi：10．3969／j．issn．1002-3550．2014．04．042 矿物掺合料和养护方式对轻骨料混凝土吸水性的影响 柴 苗，朱国飞，徐思印 (深圳大学土木工程学院深圳市土木工程耐久性重点实验室，广东深圳 5 1 8060) 摘 要： 混凝土吸水性与耐久性之间有着密切的关系，混凝土要获得高耐久性的其中一个关键就是防止有害离子通过水溶液 进入混凝土。因此研究水进入混凝土表面的速率成为研究混凝土耐久性的一种重要方法。利用吸水试验测得轻骨料混凝土(水胶 比0．44)在不同矿物掺合料和养护方式下的吸水率变化，然后通过数据分析得出其吸水率变化曲线。比较这些曲线之间的变化， 可发现：①轻骨料混凝土在蒸汽养护前期其吸水率小于标准养护条件下的吸水率，但蒸汽养护后期两者的变化基本相同。②蒸汽 养护条件下，掺入粉煤灰，不利于轻骨料混凝土吸水率的降低。⑨蒸汽养护条件下，硅粉的掺人降低了混凝土的表面吸水率，对轻 骨料混凝土的耐久性是有利的。 关键词：轻骨料混凝土；吸水性；矿物掺合料；耐久性 中图分类号：TU528．01 文献标志码：A 文章编号： 1002—3550(20l4)O4—0l52一O3 Effect of mineral admixtures and curing conditions on the water absorption of lightweight aggregate concrete CHAIMiao，ZHUGuofei，XUSiyin (ShertzhenKeyLab onDurabilityofCivilEngineering，DepartmentofCivilEngineering，ShenzhenUniversity，Shenzhen 518060，China) Abstract：There is a close relationship between water absorption and durability of concrete．One of the key factors to obtain high dura— bility concrete is to prevent harmful ions through aqueous solution into the concrete．So studying the rate ofwater into concrete surface be— came an important method to investigate the durability ofconcrete．Based on the water absorption test，the variation ofwater absorption of lightweight aggregate concrete(water—binder ratio is 0．44)which mixed different mineral admixture and were under different curing condi— tions were studied．Then through data analyzing，the water absorption curves were obtained．And comparing these curves，we find that in earlycuringage，thewaterabsorptionoflightweightaggregate concre