石灰石粉对氯氧镁水泥性能的影响

Impact of Limestone Powder on Properties of Magnesium Oxychloride Cement

为合理利用生产石灰石集料的副产品——石灰石粉,发展绿色建筑材料,研究了不同掺量石灰石粉对氯氧镁水泥初凝时间、终凝时间、强度、耐水性及耐硫酸盐腐蚀性能的影响,并观察了掺入石灰石粉后氯氧镁水泥微观形态的变化。试验结果表明:随着石灰石粉掺量的增加,镁水泥的初、终凝时间延长,强度逐渐降低,耐水性也逐渐降低,但硫酸盐侵蚀性能较好。在微观形态上表现为:石灰石粉的加入使胶凝相更为分散,生长出大量细长的晶体;清水浸泡时生成了大量大孔隙,硫酸盐腐蚀时生成片状晶体;但掺量即使达到40%,镁水泥的强度一样可以接近普通硅酸盐水泥的2倍。将石灰石粉大量取代轻烧粉加入氯氧镁水泥中作为建筑材料使用,是大量利用石灰石粉可供选择的良好途径。

For the rational use of limestone aggregate production byproduct-limestone powder, and developing green building materials, the initial setting, final setting time, strength, water resistance and sulfate corrosion of mag- nesium oxychloride cement of different limestone powder content were studied, and morphology changes after incorpo- ration of magnesium oxychloride cement limestone powder was also observed. The results showed that., with the in- creasing content of limestone powder, magnesium cement initial and final setting time extended, strength decreased, water resistance gradually reduced, but better to sulfate attack. On the morphology as follows., join in limestone pow- der dispersed the gelling, grow a large number of elongated crystals, generated a lot of water soaking large pores, and generated flaky crystals in sulfate corrosiorL But even if the content of 40%, the strength of magnesium cement was closed to two times the ordinary Portland cement. Replacing largely the light burning magnesium oxychloride cement powder by limestone powder as building materials, is a good choice for extensive use of limestone powder.