粉煤灰和矿粉双掺对水泥基材料固化氯离子能力的研究

Study on Fly Ash and Slag on Binding of Chloride Ion into Cement Based Materials

以单掺和复掺矿物掺合料(粉煤灰、矿粉)的方式,研究水泥基材料对氯离子的固化特性。结果表明:单掺情况下,反应前期掺矿粉水泥基材料氯离子固化率高于掺粉煤灰;反应后期则相反,表明粉煤灰固化氯离子效果优于矿粉。复掺情况下,反应前期氯离子固化率随着F/S(粉煤灰/矿粉)比例的减小而增大;反应后期随着F/S(粉煤灰/矿粉)比例的增大而增大,表明随着粉煤灰掺入比例的增大,氯离子固化率变大。比较单掺和复掺的氯离子固化率可知,复掺固化率与单掺粉煤灰相近,并高于单掺矿粉。但是,就反应前期来看,复掺时的固化率高于任何一种单掺形式,表明,复掺对胶凝材料反应前期的氯离子固化率提升较快。

The chloride binding capability of slag-fly ash mixed cement based materials is studied. The experimental results showed that the chloride binding capability of the cement based materials mixed with fly ash is lower than which mixed with slag at first, and higher than it later. In experiment of slag-fly ash mixed cement based materials, the chloride binding capability is becoming higher when the F/S （ Fly ash/ Slag） ratio is low at first, and then come down. Compared the mixed cement based materials with the single cement based materials, the chloride binding capability of the mixed materials is the same as the material mixed with fly ash single, and higher than which mixed with slag. But the chloride binding capability of the mixed materials is higher than any single cement based materials in the early stage of hydration process, it is also associated with the high ratio of aluminum in fly ash.