【摘要】 研究了高温作用对高强混凝土(HSC)及含PP纤维的高强混凝土渗透性能的影响,探讨了表征渗透性的湿迁移渗透系数、相对氯离子渗透系数及空气渗透系数之间的关系以及渗透性与爆裂的关系.研究表明,HSC遭受500℃的高温后,湿迁移渗透系数、相对氯离子渗透系数及空气渗透系数都大幅度增加,PP纤维可以有效地缓解高温后高强混凝土渗透性的劣化,3种渗透系数之间具有较好的相关性,HSC高温后的渗透性能与爆裂性能有一定的对应关系,HSC具有一个临界爆裂渗透系数.更多还原

【Abstract】 Effect of high temperature on permeability of high strength concrete and high strength concrete with polypropylene fibers are investigated.The relation between water permeability coefficient,chloride ion permeability coefficient and air permeability coefficient,as well as the relation between permeability and spalling are discussed.Results show that water permeability coefficient,chloride ion permeability coefficient and air permeability coefficient of high strength concrete increase remarkably after 500 ℃ heating.Polypropylene fibers can effectively mitigate the deterioration of permeability of high strength concrete after heating.There are preferable relationship among three permeability coefficients.Corresponding relation exists between permeability and spalling of high strength concrete after high temperature and there is a critical permeability parameter for spalling.更多还原