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分别对比研究了单掺粉煤灰、单掺矿粉以及混掺粉煤灰与矿粉的胶凝材料体系的水化放热性能和开裂敏感性。试验结果表明:粉煤灰可以明显降低胶凝材料体系的放热总量、放热速率以及开裂敏感性,并随着粉煤灰掺量的增加,降低效果越明显。只有掺量大于70%的矿粉才可以明显降低胶凝材料体系的放热总量及放热速率,但是矿粉掺量大于30%不利于提高体系的抗裂性能。混合掺入粉煤灰与矿粉更能降低胶凝材料的放热速率、放热总量,减缓水化放热速率变化趋势,降低体系开裂敏感性。
The hydration exothermicity and cracking susceptibility of cementitious materials with single-mixed fly ash, single-doped fly ash and mixed fly ash and mineral powder were compared. The experimental results show that fly ash can significantly reduce the total exothermic amount, heat release rate and cracking susceptibility of the cementitious material system. With the increase of fly ash content, the effect of reducing fly ash is more obvious. Only the content of more than 70% of the mineral powder can significantly reduce the total amount of exothermic heat release rate and the cementitious material system, but the amount of mineral powder greater than 30% is not conducive to improve the crack resistance of the system. Mixed with fly ash and slag can reduce the exothermic rate of cementitious materials, the total amount of exothermic, slow down the trend of hydration exothermic rate and reduce the system cracking sensitivity.