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前言粉煤灰是一种具有细分散作用和火山灰作用的物质,它可以改善混凝土的使用性能、降低水化热、改善其防水性能和增加混凝土的长期强度。因此,粉煤灰正越来越多地用于生产粉煤灰水泥或用作混凝土的配合料以代替部分水泥。所以,在水泥一粉煤灰系统中粉煤灰水化活性的测定是十分有意义的。目前,国内外测定粉煤灰活性的方法归纳起来有以下几种:石灰吸取法、活性组分浸出法、量热法及电导率法、苏联国家标准法、ISO法和强度实验法。这些方法有的很难反映出粉煤灰的真正活性,有的虽然反映出粉煤灰具有活性,但不能
Introduction Fly ash is a substance with fine dispersion and pozzolanic effect. It can improve the performance of concrete, reduce the heat of hydration, improve its waterproof performance and increase the long-term strength of concrete. Therefore, fly ash is increasingly being used to produce fly ash cement or as a concrete batch to replace part of the cement. Therefore, the determination of fly ash hydration activity in cement-fly ash system is very meaningful. At present, the domestic and foreign methods for the determination of fly ash activity can be summed up in the following categories: lime extraction method, active ingredient leaching method, calorimetry method and conductivity method, Soviet national standard method, ISO method and strength test method. Some of these methods are difficult to reflect the true activity of fly ash, and some of them reflect that fly ash is active but cannot