湿筛对掺MgO膨胀剂混凝土安定性评价的影响  

Influences of Wet Screening on Soundness Evaluation of Concrete with MgO Expansive Agents

作　　者：黄晓军[1] 邓敏[1,2] 莫立武[1] 张丰[1] 陈维佳[1] 

机构地区：[1]南京工业大学材料与工程学院材料化学工程国家重点实验室,南京210009 [2]先进土木工程材料协同创新中心,南京211189

出　　处：《材料导报（纳米与新材料专辑）》2015年第2期550-553,共4页

基　　金：国家科技支撑计划(2011BAE27B01);教育部长江学者和创新团队发展计划(PCSIRT;IRT1146)

摘　　要：在80℃加速养护条件下,采用数据采集系统连续测定掺MgO膨胀剂(MEA)三级配混凝土、湿筛二级配混凝土和湿筛一级配混凝土试件的膨胀率,结合混凝土的劈裂抗拉强度和微观结构来评价掺MEA混凝土的安定性。结果表明:三级配混凝土、湿筛二级配混凝土和湿筛一级配混凝土中MEA的极限掺量分别为12%、10%和8%,掺MEA湿筛二级配混凝土和湿筛一级配混凝土的安定性评定并不能反映三级配混凝土试件的安定性,采用实际配合比混凝土来评定MEA的安定性更能反映实际情况。The soundness of the three graded, wet screened two graded and wet screened one graded concrete specimens with MgO expansive agent （MEA） was evaluated by combination of expansion, splitting tensile strength and microstructure. The results demonstrate that the limit of MEA in the three graded, wet screened two graded and wet screened one graded concrete was 12%, 10 %and 8%, respectively. The soundness of wet screened two graded or wet screened one graded concrete does not represent soundness of the three graded concrete. Therefore, the soundness of concrete specimens contained MEA should be evaluated by the practical mix proportion used in the engineering.

关 键 词：MGO膨胀剂 混凝土 安定性 湿筛 

分 类 号：TU528.042[建筑科学—建筑技术科学]