膨胀结晶型防火材料对混凝土耐火性能的影响

为了研究结晶型防火涂层对混凝土耐火性能的影响，设计了4个体积分数（1%、2%、3%和4%）的结晶型防火涂层用于混凝土耐火性能的改良，然后开展了混凝土试件的质量、渗透性能和力学性能的测试，同时开展SEM试验，研究其微观结构。结果表明：燃烧试验对混凝土造成了严重的损伤，质量损失率随防火涂料浓度的增大呈先降低后稳定的特点；当防火涂料体积分数为0~3%时，混凝土渗水高度随浓度增加而减小，超过3%后变化幅度较小；表面防护作用加速了混凝土早期强度的形成，养护28 d后混凝土强度几乎不受防火涂料浓度的影响；结晶型防火材料改变了混凝土内部的孔隙结构，体积分数3%和4%的防火涂层可以形成连续状晶体膜结构。

Effects of crystallized fire proof material on thefire resistance of concrete

 In order to study the influence of expansive crystallized fireproof materials on the fire resistance of concrete, four kinds of crystallized fireproof coatings (1%,2%,3%,4%)were designed to improve the fire resistance of concrete. The mass, permeability and mechanical properties of concrete specimens were tested, and the microstructure was studied by SEM. The results showed that the combustion test caused serious damage to concrete, and the mass loss rate decreased first and then stabilized with the increase of the concentration of fire retardant coating. When the concentration of fire retardant coating is 0~3%, the seepage height of concrete decreases with the increase of concentration, and the variation range is small after more than 3%. The surface protection accelerates the formation of early strength of concrete, and the strength of concrete after 28 days of curing is almost not affected by the concentration of fire retardant coating. The pore structure of concrete surface was changed by crystalline fireproof coating, and the coating with 3% and 4% concentration forms a continuous crystal film structure.