论文部分内容阅读
本文针对复掺不同矿物掺合料且浮石替代率为30%的混合骨料混凝土,利用扫描电镜SEM观察界面过渡区ITZ的微观结构和水化产物,从微观层面分析矿物掺合料对混合骨料混凝土抗冻性能的影响。SEM分析结果表明:20%粉煤灰与10%石粉复掺的界面比20%粉煤灰与10%矿粉复掺的界面劣化严重,矿粉与粉煤灰复掺的界面结构致密,抗冻性能良好。采用粉煤灰与矿粉复掺替代部分水泥配制混合骨料混凝土可获得较优的抗冻性能。
In this paper, for the mixed aggregate concrete with different mineral admixtures and pumice replacement rate of 30%, the microstructure and hydration products of ITZ in interface transition zone were observed by scanning electron microscope (SEM), and the effects of mineral admixtures on mixed bone Effect of concrete on frost resistance. The results of SEM analysis show that the interface of 20% fly ash and 10% stone powder is more serious than the interface between 20% fly ash and 10% slag. The interface between fly ash and fly ash is dense, Good cold performance. The use of fly ash and slag mixed replacement part of the cement preparation of mixed aggregate concrete can obtain better frost resistance.