护岸工程用高掺量粉煤灰混凝土试验研究

【作者】 马立彬； 高建明； 沈烨冏；

【机构】 东南大学材料学院、江苏省土木工程材料重点实验室；

【摘要】 本文主要对适用于河道护岸工程的高掺量粉煤灰混凝土的强度和耐久性进行了研究,结果表明:粉煤灰取代部分水泥会降低混凝土的早期强度,但后期强度发展比较明显,并成功制备了胶凝材料总量为300kg/m~3,粉煤灰掺量为55%的C25级混凝土;与普通混凝土相比,掺入粉煤灰后混凝土的抗碳化性能和抗冻性有所下降,但混凝土的干燥收缩值减小,抗氯离子渗透性能也有明显提高。更多还原

【Abstract】 This paper presents an experimental study on the mechanical properties and durability properties of high volume fly ash concrete,the results indicate that fly ash replace part cement of concrete significantly reduce the early-age strength of concrete,however,the later-age strength increase obviously,and 25MPa grade concrete can be prepared with a total cementitious materials content of 300kg/m~3 and 55%of which is fly ash.Compared with ordinary concrete,the carbonation and freezing and thawing resistance of concrete decreases when the fly ash is used, on the other hand,high volume fly ash concrete shows better resistance to the drying shrinkage and chloride ion penetration.更多还原