煤矸石混凝土抗氯离子渗透实验研究

为了解煤矸石混凝土抗氯离子渗透性能，以自燃煤矸石为粗、细集料，42.5普通硅酸盐水泥为胶凝材料并掺入粉煤灰，制备煤矸石混凝土试件，进行抗氯离子渗透实验，研究了水胶比、粉煤灰掺量以及抗压强度对煤矸石混凝土抗氯离子渗透性能的影响。结果表明：非稳态条件下煤矸石混凝土氯离子渗透深度随水胶比增加而加深，呈正相关，氯离子渗透深度增长速度在水胶比0.42~0.48时较快，在水胶比0.48~0.56时缓慢；氯离子迁移系数与水胶比呈正相关，与粉煤灰掺量呈负相关；氯离子迁移系数随抗压强度增大而减小，呈负相关，负相关显著性强弱表现为粉煤灰掺量0%<粉煤灰掺量20%<粉煤灰掺量40%。掺入粉煤灰可以改善煤矸石混凝土耐久性能。

Experiment Study on Chloride Ion Penetration of Coal Gangue Concrete

Take spontaneous combustion coal gangue, 42.5 ordinary portland cement and lfy ash to make coal gangue lightweight aggregate concrete which in order to understand the anti chloride ion permeability. The chloride ion penetration test is carried out that in order to study the relationship between anti chloride ion permeability and water cement ratio, lfy ash content as well as compressive strength. Experimental results show:the chloride ion penetration depth under the condition of non steady state increases with the water cement ratio and is positive correlation. The growth rate is faster between 0.42~0.48 of water cement ratio and slower between 0.48~0.56 of water cement ratio. Chloride migration coefifcient and water cement ratio is positively correlated. Chloride migration coefifcient decreases with the increase of compressive strength and is negative correlation. The strength of the situation is as follows: the lfy ash content of 0% is less than the lfy ash content of 20% and the lfy ash content of 20% is less than the lfy ash content of 40%. Fly ash can improve the durability of coal gangue concrete.