硅酸盐隧道防火涂料有很多的优异性能.但是这种隧道防火涂料的低粘结强度和较差的耐水性能限制了改防火涂料的应用.本文介绍了在普通隧道防火涂料掺入可再分散乳胶粉,使其与水泥组成理想的粘结体系.实验证明,可再分散乳胶粉加入量为2%(质量分数)时,可使隧道防火涂料的粘结强度、耐水性、冷热循环和耐火极限进一步得到提高.同时,由于隧道防火涂料是单一体系,使用方便,并可大大较少运输、贮存、包装费用.结果显示,根据GA98-1995和GB/T7798-88测试,隧道防火涂料涂层为10mm时,耐火极限＞2h.
Silicate fireproof coatings for tunnels (FCT) have many eminent properties.But low adhesion strength and poor water/fire-resistance of this kind of materials largely limit its applications.Here fireproof coating for tunnels was modified by adding redispersible powders (2wt%).The ideal bonding system consisting of cement and redispersible powders could increase the adhesive strength with other base material and improve properties of water-resistance,fire-resistant time,weather-resisting of FCT.The polymer-modified FCT was a new kind of mono-integradient composite with easily application,and was greatly reduced the cost for transportation,storage and package.Results show that when the thickness of the dry film is 10mm,the fire-resistant time of the coating could last over two hours according to GA98-1995 (Currency techno-term fire resistive coating for prestressed concrete floor) and GB/T7798-88 (Fire-resistance tests-elements of building construction).
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