Research on the reversibly thermochromic functional cementbased composite at normal temperature
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摘要: 在白水泥中掺加常温可逆温致变色微胶囊制备了先进功能水泥基复合材料。该材料的颜色随温度变化可在低温时的蓝、绿、红色和高温时的白色之间可逆变化, 其变色温度约在42～58 ℃。方差分析判断结果表明,掺加10 %蓝温致变色颜料微胶囊对细度、强度有明显影响。细度下降约37 % , 标准稠度用水量增加约13 % , 凝结时间变化不大, 安定性合格; 在同流动度条件下, 硬化水泥浆体3 、7 、28 d 抗折强度均下降20 %左右, 抗压强度下降30 %～40 %。所研究的常温可逆温致变色功能水泥基复合材料具有低温下吸收太阳能、高温下反射太阳能、且能随温度进行可逆转换的吸热绝热功能, 符合建筑物冬暖夏凉的要求。Abstract: A reversibly thermochromic functional cement based composite at normal temperature was prepared byadding reversibly thermochromic microencapsules in white Portland cement . The research result s show that thecolors of the composites can be changed reversibly f rom blue , green , red at lower temperature to white at highertemperature , and the switching temperature is about 42～58 ℃. Mean square analyses show that when the blue thermochromic microencapsule , B30 , is added in white Portland cement , the fineness and st rength of the composite canbe affected greatly. The water demand for the standard consistency of cement slurry increases by about 13 % , andthe flexural st rength and compressive st rength decrease by 20 %～40 % , but the setting time and the soundness ofcement are not affected. The composite has the light-absorbing and light-reflecting t ransforming function for buildings , indicating that the prepared composite can meet the demand for creation of a thermally comfortable environment of buildings.
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