BFRC中玄武岩纤维的分散性与胶砂流动性

Fluidity of Cement Mortar and Dispersion of Basalt Fiber of BFRC

通过机械力及材料间的摩擦并不能使玄武岩纤维有效分散于水泥砂浆基体中。选用羧甲基纤维素(CMC)作为分散剂,采用超声波振荡,当胶砂流动度大于170mm时,实现了玄武岩纤维在水泥基体中的均匀分散。CMC分散剂有助于纤维分散,其水溶液质量分数宜保持在1.56%～1.77%间,温度宜控制在40～44℃。随着纤维含量的增加,玄武岩纤维增强水泥基复合材料(BFRC)的胶砂流动性逐渐降低,粉煤灰掺量达20%以上时,BFRC的胶砂流动性显著提高,掺量不超过25%时,BFRC的28d抗折、抗压强度均有所提高。

Using mechanical force or the friction between materials cannot make the basalt fiber disperse well. With the help of ultrasonic wave and a dispersant carhoxymethyl cellulose （CMC）, when the fluidity of BFRC was greater than 170 mm, the even dispersion of short basalt fibers was realized. CMC is helpful for the dispersion of fi ber, it would be the best to control the mass fraction of the aqueous solution between 1.56% and 1.77%, and keep the temperature between 40 ℃ and 44 ℃. The fluidity of BFRC decreased as the fiber content increasing. When the amount of fly ash replaces the cement more than 20% by weight, the increment of fluidity of BFRC is obvious. And when the replacement is less than 25%, it can improve both the compressive strength and tensile strength at age of 28 days.