不同掺合料对桥面高性能混凝土抗渗性能的影响研究

Influence of Different Admixtures on Impermeability of High Performance Concrete on Bridge Deck

为探究矿物掺合料对桥面高性能混凝土渗透性能的影响规律,文中对30%粉煤灰、45%矿粉为矿物掺合料的高性能混凝土抗渗性能进行研究。结果表明,粉煤灰的掺入对混凝土早期毛细管吸水率、气体渗透系数、电通量及氯离子扩散系数产生不利影响,但能够改善混凝土后期毛细管吸水率、气体渗透系数、电通量及氯离子扩散系数;同时,对混凝土早期抗渗性能产生正面作用,而对后期抗渗性能产生不利影响。

In order to investigate the effect of mineral admixtures on the permeability of high performance concrete on bridge floor,the imper-meability of high performance concrete with 30%fly ash and 45%mineral powder as admixtures was tested.The results show that the incorpo-ration of fly ash has adverse effects on the early capllary adsorption rate,gas permeability coefficient,electric flux and chloride ion diffusion coefficient of concrete,but can improve the late capillary adsorption rate,gas permeability coefficient,electric flux and chloride ion difusion coefficient of concrete.At the same time,it will have a positive effect on the early impermeability of concrete,and a negative effect on the later impermeability of concrete.