煅烧白云岩对砂浆膨胀和抗压强度的影响  

Effects of calcined dolostone on expansion and compressive strength of mortars

作　　者：恽进进 邓敏 莫立武[1] 刘成龙 YUN Jinjin;DENG Min;MO Liwu;LIU Chenglong(The Synergetic Innovation Center for Advanced Materials,Nanjing 210009,China;State Key Laboratory of Materials-OrientedChemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]江苏先进生物与化学制造协同创新中心,江苏南京210009 [2]南京工业大学材料科学与工程学院材料化学工程国家重点实验室,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2018年第5期67-71,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家科技支撑计划(2011BAE27B01);国家自然科学基金重点项目(51461135003);国家重点研发计划(2016YFB0303601)

摘　　要：以白云岩为原料,分别在800、850和900℃下煅烧1和2 h来制备煅烧白云岩(CD),测定掺CD的砂浆试件的膨胀率和抗压强度。结果表明:CD会略增大水泥的标准稠度用水量,且随着CD煅烧温度的升高或保温时间的延长,掺CD水泥标准稠度用水量趋于增大。砂浆的膨胀率随着CD掺量的增加而增大,随着煅烧温度升高或保温时间延长,掺CD砂浆膨胀率也随之增加,膨胀达到稳定所需要的时间延长。掺10%的850℃下煅烧2 h的CD的砂浆7、28和90 d抗压强度均略高于不掺CD的对比样。除900℃煅烧2 h的CD外,随着CD煅烧温度的升高或保温时间的延长,掺CD砂浆的抗压强度趋于升高。相同掺量时,掺850℃下煅烧2 h的CD砂浆的抗压强度最高。The calcined dolostone（CD） was prepared by calcining dolostones at 800,850 and 900 ℃ for 1 and 2 h.The expansion and compressive strength of mortars mixed with calcined dolostone were investigated.Results showed that CD might increase the water requirement for normal consistence of cement and increasing the calcination temperature and residence time of CD would increase the water requirement for normal consistence of cement.The expansion of mortars incorporated with more CD was larger.CD calcined at higher temperatures for longer time would bring about larger expansion of mortars.However,higher calcining temperatures or longer residence time would prolong the time for the development of expansion of mortars.The incorporation of CD tended to reduce the compressive strength of mortars,but the compressive strength of mortars mixed with CD calcined at 850 ℃for 2 h was higher than that without CD at 7,28 and 90 d when the content of CD was 10%.CD calcined at higher temperatures for longer time would cause less loss of compressive strength of mortars except the CD calcined at 900 ℃ for 2 h.

关 键 词：煅烧白云岩 砂浆 膨胀 抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]