纤维对高钙粉煤灰混凝土膨胀抑制作用研究

摘要

在大掺量高钙粉煤灰水泥浆体中掺入不同类型的纤维，探求纤维在水泥基体发生膨胀时的作用效果和规律。试验结果表明：不同纤维对水泥浆体膨胀抑制效果差别很大，高弹模的碳纤维、抗碱玻璃纤维能较好地抑制水泥浆体中高钙粉煤灰的膨胀，而低弹模的尼龙纤维对水泥浆体的膨胀作用无抑制作用。而在给定的掺有抗碱玻璃纤维情况下，纤维掺量越大其对高钙粉煤灰的抑制作用越明显。%The effects of different types of fibers on expansion of cement paste,in which a large amount of fly ash with high content of f-CaO(HFA) was added,were investigated and the way to prevent cement paste with HFA from expansion was proposed.The results showed that the effects of different fibers on expansion of cement paste were related to the properties of fibers.Carbon fiber and alkali-resistant glass fiber which had high elastic modulus can effectively restrain the expansion ,while nylon fiber with low elastic modulus had no re-straint effect on the expansion.In addition,the restraint effect of alkali-resistant glass fiber increased with the increase of fiber content.