掺MgO补偿收缩混凝土限制膨胀率研究  

Limited Expansion Ratio of Shrinkage Compensating Concrete Mixed with Mgo Expansive Agent

作　　者：张臻[1] 闫宁霞[1] 李洋[2] 张迎雪[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]中国电建集团西北勘测设计研究院有限公司,陕西西安710000

出　　处：《水利与建筑工程学报》2016年第6期142-145,共4页Journal of Water Resources and Architectural Engineering

基　　金：十二五科技支撑计划项目(2012BAD08B01);十三五国家重点研发计划项目(2016YFC0400203)

摘　　要：为满足工程结构尤其是渠道衬砌板抗裂防渗的要求,提高膨胀剂的性能,提出了早期膨胀剂与延迟性膨胀剂复合的思路。采用三元二次旋转正交组合设计试验,研究了U型膨胀剂、氧化镁及水胶比对混凝土胀缩性能的影响规律,建立了各参数间的回归模型。研究表明:UEA掺量对混凝土限制膨胀率影响最大,水胶比次之,MgO掺量影响最小;随着膨胀剂掺量的增大混凝土限制膨胀率先增大后减小,水胶比对其影响则呈线性变化;当UEA掺10%,MgO掺3%,水胶比0.55时,混凝土膨胀率最大。To meet requirements of engineering structures,especially the crack resistance and impermeability performance of canal lining,and improve the performance of expansive agent,the concept mixed with early expansion agent and delayed expansion agent was proposed. According to the ternary quadratic rotary orthogonal experiment design,the influence laws of UEA- S,MgO and water-binder ratio on the shrinkage performance of the new compensation shrinkage concrete were derived,and the regression models of those factors were developed. The results are as follows： the influence of each factor on limited expansion ratio from high to low follows this order： the mixing amount of UEA- S,water-binder ratio,the mixing amount of MgO. The influence of UEA- S and MgO on limited expansion ratio is parabola type,and the influence of water-binder ratio is linear type. The optimum mixture ratio of the shrinkage compensating concrete is： the mixing amount of UEA- S is 10%,the mixing amount of MgO is 3%and the water cement is 0. 55.

关 键 词：膨胀剂 抗裂 氧化镁 限制膨胀率 补偿 收缩 

分 类 号：TU528.042[建筑科学—建筑技术科学]