大掺量矿物细粉掺和料活性粉末混凝土高温性能

High Temperature Performance of High Volume Fine Mineral Mixture of Reactive Powder Concrete

研究了大掺量矿物细粉活性粉末混凝土高温爆裂性能和高温后的抗压强度.结果表明,试件的爆裂温度随着水胶比的减小而降低,爆裂几率随水胶比的降低而增大;高温爆裂的初始时间和温度随矿物细粉掺和料掺量增多而降低;聚丙烯纤维能有效地改善活性粉末混凝土抗爆裂性能;活性粉末混凝土经200℃高温后的抗压强度有所增加,且聚丙烯纤维的加入可使活性粉末混凝土抗压强度和200℃范围内残余强度率有一定幅度提高.

This paper researches the burst properties of high temperature and compressive strength after heating of high volume fine mineral mixture of reactive powder concrete. Results show that with the decrease of the water-cement ratio, the burst temperature of the specimen decreases and the burst probability increases. The initial time and temperature of high-temperature burst decrease with increasing amount of fine mineral mixture. Polypropylene fiber can effectively improve the anti-burst performance of reactive powder concrete. Reactive powder concrete after 200 ℃ heating can increase the compressive strength. In addition, adding polypropylene fiber can improve the compressive strength of reactive powder concrete and residual strength ratio in the range of 200 ℃.