MgO膨胀剂细度对MgO水化和水泥浆体膨胀的影响  

Influence of Fineness of MEA on Hydration of MgO and Expansion of Cement Pastes

作　　者：姜建松[1,2] 邓敏[1,2,3] 莫立武[1,2] 陈维佳[1,2] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京211189 [2]南京工业大学材料化学与工程国家重点实验室,江苏南京210009 [3]先进土木工程材料协同创新中心,江苏南京211189

出　　处：《水电能源科学》2016年第2期116-119,139,共5页Water Resources and Power

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

摘　　要：基于《水工混凝土掺用氧化镁技术规范》中的Ⅰ型氧化镁(MgO),研究了该型MgO膨胀剂(MEA)细度对掺粉煤灰水泥浆体膨胀性能的影响。即采用X射线衍射分析(XRD)及同步热分析(TG-DSC)分析了掺MEA水泥浆体中MgO的水化性。结果表明,养护温度相同时,MEA的细度对水泥浆体内MEA中MgO的水化和水泥浆体的膨胀无显著影响,产生的膨胀均能补偿水泥浆体的收缩;MEA的细度可从试验设计采用的45μm筛筛余15%左右增加到30%左右,这将有利于MEA生产企业的节能降耗。This study aims to investigate the impacts of fineness of MgO expansive agent（MEA）on its hydration and expansion properties.According to DL/T 5296-2013 ＂Technical Specification of Magnesium Oxide Expansive for use in Hydraulic Concrete＂,Type＂I＂MEA was used.The expansions of cement pastes incorporated with MEA with different fineness and fly ash were investigated.The hydration degree of MgO was analyzed by X-ray diffraction and TG-DSC.The results show that the impact of the fineness of MEA on the hydration degree of MgO in MEA and the corresponding expansion of cement pastes are insignificant,and that the expansion due to hydration of MgO in MEA might effectively compensate the shrinkage of the cement pastes.Accordingly,the particle fineness of MEA with a residue retained on 45μm sieve（design of experiments）of MEA may be increased from 15%to 30%,which contributes to energy-saving and cost-reducing for grinding.

关 键 词：细度 MGO膨胀剂 水泥浆体 膨胀 水化 

分 类 号：TV42[水利工程—水工结构工程] TU528.042.4[建筑科学—建筑技术科学]