几种防水减缩组分对混凝土氯离子扩散系数的影响

Influence of several components of waterproof and shrinkage reducing on concrete chloride diffusion coefficient

研究了混凝土中掺入硅油、有机硅防水剂及保水剂的质量和氯离子扩散系数变化规律。利用电导率仪和电子天平测算出混凝土不同龄期的氯离子扩散系数和质量损失的变化规律。干养条件下随着硅油掺量的增加,氯离子扩散系数逐渐降低且只有当硅油掺量1%质量损失低于空白;随着有机硅防水剂和保水剂掺量的增加,氯离子扩散系数先降低后增加,质量损失与扩散系数变化规律基本一致。在一定掺量范围内,硅油、有机硅防水剂和保水剂都对降低氯离子扩散系数和质量损失有较明显的作用。

It aimd to investigate the variation of quality loss and chloride diffusion coefficient of concrete mixing silicone oil,organosilicon waterproof agent and water retaining agent.The conductivity meter and electronic balance were used to measure the variational regulation of quality loss and chloride diffusion coefficient of different ages concrete.The result demonstrates that in dry curing condition with the increase of silicone oil content,the chloride diffusion coefficien gradually reduce.And when concrete mixing l%silicone oil,the concrete quality loss lower than blank.With the increase of organosilicon waterproof agent and water retaining agent content,the chloride diffusion coefficient firstly decrease and then increase.The variation of concrete quality loss and chloride diffusion coefficient are basically the same.In a certain range,the effect of reducing concrete quality loss and chloride diffusion coefficient is obvious when concrete mixing silicone oil,organosilicon waterproof agent and water retaining agent.