养护方式对纳米氧化镁水泥浆体强度的影响研究  

Effect of curing conditions on strength of Nano-MgO cement paste

作　　者：宋诗琦 蒋林华[1] 姜少博 严先萃 

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《混凝土》2017年第9期40-44,共5页Concrete

基　　金：国家自然科学基金(51278167);国家科技支撑计划(2015BAB07B04);中央高校业务费(2016B04514)

摘　　要：采用纳米氧化镁(Nano-MgO)替代常规MgO类膨胀剂掺入水泥浆体中,以期望能够提高水泥浆体的抗折、抗压强度。采用不同的养护方式、养护温度和水灰比进行试验,试验中借助了X射线衍射(XRD)等微观测试技术研究其机理。试验结果表明:掺入Nano-MgO可以提高水泥浆体的抗折、抗压强度;适当的提高养护温度有助于浆体强度的增长;同等条件下,饱和氢氧化钙溶液养护和蒸汽养护对强度发展更加有益;相同掺量时,水灰比增大,其强度呈现下降趋势;XRD图谱反映出适当的提高养护温度,Nano-MgO水泥浆体水化更充分,试验对象的强度也随之提升。In order to improve the strength of cement based materials, In this paper Nano Magnesiurn Oxide （Nano-MgO） is used to replace the conventional MgO type expansion agent in the cement paste.And different curing methods, curing temperature and water cement ratio were tested, and the mechanism was studied by X ray diffraction （XRD） and other microscopic test techniques.The results show that Nano-MgO can improve the flexural and compressive strength of cement paste when it was put into the cement paste; increasing the curing temperature appropriate help the flexural and compressive strength growth of the cement paste; and at the same conditions, the saturated calcium hydroxide solution curing and steam curing is helpful to the strength of the development ; at the same percentage of Nano-MgO to cement, the increase of water cement ratio, the strength decreased the trend.The XRD map reflects that the increase in temperature appropriate, Nano-MgO cement paste hydration more fully, and the strength of the test object is also improved.

关 键 词：Nano—MgO 养护方式 养护温度 水灰比 力学强度 

分 类 号：TU528.064[建筑科学—建筑技术科学]