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测定粉煤灰的活性,一般和测定火山灰的活性一样,采用15次石灰吸收法。这样不仅需时很长(30天),而且吸收值的大小与试件强度,有时找不出确切的规律。采用石灰快速吸收法,将粉煤灰和石灰饱和溶液置于100℃水浴上加热24小时,测定粉煤灰的石灰吸收量。由于提高了反应溶液的温度,大大加快了石灰吸收速度。如石景山粉煤灰在常温下经30天,石灰吸收量只13.2mg/g,反应溶液温度提高至100℃,24小时的石灰吸收量即达25.6mg/g。这一方法也有缺点,它没有考虑到反应溶液浓度对石灰吸收值的影响,如石灰溶液的
Determination of the activity of fly ash is generally the same as the determination of the activity of pozzolans, using 15 lime absorption methods. This not only takes a long time (30 days), but also the size of the absorption value and the strength of the test piece, sometimes it is impossible to find the exact law. Using lime fast absorption method, fly ash and lime saturated solution were placed on a 100°C water bath and heated for 24 hours to determine the amount of lime absorbed by the fly ash. As the temperature of the reaction solution is increased, the lime absorption rate is greatly accelerated. Such as Shijingshan fly ash at room temperature for 30 days, the amount of lime absorption is only 13.2mg/g, the temperature of the reaction solution is increased to 100 °C, the lime absorption of 24 hours is up to 25.6mg/g. This method also has its disadvantages. It does not take into account the effect of the concentration of the reaction solution on the absorption value of lime, such as the solution of lime.