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利用超细粉磨设备将粉煤灰原灰进行超细磨后,进行了混凝土轴心抗压强度试验、混凝土半绝热温升试验和净浆干燥收缩试验研究。试验结果表明,与普通粉煤灰不同,超细粉煤灰对于混凝土早龄期7d抗压强度也有所提高,随着超细粉煤灰掺量的提高,混凝土28d和60d抗压强度提高更多;掺超细粉煤灰对降低混凝土温升的效果不明显,其降低水化热效果不如普通粉煤灰;随着超细粉煤灰掺量提高,水泥净浆试件的干燥收缩有减小的趋势,对体积稳定性是有利的。
Ultrafine grinding equipment is used to ultrafine the fly ash raw ash, then the concrete axial compressive strength test, the concrete semi-adiabatic temperature rise test and the puree drying shrinkage test are carried out. The experimental results show that, different from ordinary fly ash, the compressive strength of ultrafine fly ash for 7 days of concrete is also improved. With the increase of the content of ultrafine fly ash, the compressive strength of concrete increases more for 28d and 60d The results show that the effect of reducing the temperature rise of concrete is not obvious. The effect of reducing the heat of hydration is not as good as ordinary fly ash. With the increase of the content of ultrafine fly ash, the drying shrinkage of the cement paste The decreasing tendency is advantageous for the volume stability.