纤维网格布表层强化混凝土抗冻性能

为解决寒冷地区机场混凝土道面在长期冻融循环作用下出现的表层开裂、起皮和脱落等问题，提出通过在砂浆层中铺设玄武岩纤维网格布和抗碱玻璃纤维网格布来增强机场道面抗冻性能的方法，研究尾焰喷蚀（烧蚀）、氯盐侵蚀（浸盐）和紫外线照射（紫外）3组环境因素单独和组合作用对纤维网格布强化混凝土抗冻性能的影响规律。对不同种纤维网格布强化混凝土开展不同环境影响因素作用下的单面冻融试验，并利用SPSS软件对试验结果进行定量分析。结果表明：在复合因素作用下，纤维网格布可有效增强混凝土抗冻性能，其中玄武岩纤维网格布效果更好；3种因素同时作用对混凝土抗冻性能影响均很大；2种因素同时作用对不同混凝土抗冻性能的影响不同，对玄武岩纤维网格布强化混凝土抗冻性能的影响程度由大到小依次为烧蚀+浸盐、紫外+浸盐、烧蚀+紫外，对抗碱玻璃纤维网格布强化混凝土和素混凝抗冻性能的影响程度由大到小依次为烧蚀+浸盐、烧蚀+紫外、紫外+浸盐 ；单因素作用对混凝土抗冻性能的影响程度由大到小次序均为浸盐、烧蚀、紫外。

Frost resistance performance of surface reinforced concrete with fiber mesh

In order to solve the surface cracking, peeling and spalling of airport concrete pavement under the long term freeze thaw cycle in cold areas, this study added the basalt fiber mesh and alkali resistant glass fiber mesh in the mortar layer to enhance the frost resistance of the airport pavement. Effects of three environmental factors, which are the tail flame erosion (ablative), the chloride salt erosion (chloride corrosion) and the ultraviolet radiation (ultraviolet), on the frost resistance of fiber mesh reinforced concrete were studied, by applying factors by separate and combined means. Single side freeze thaw tests were carried out on different kinds of fiber mesh reinforced concrete under different environmental factors, and the test results are quantitatively analyzed by SPSS. The result shows that the fiber mesh can effectively enhance the frost resistance of concrete under the effect of composite factors, and the basalt fiber mesh is better. The case in which three factors are applied simultaneously has the greatest effect on the concrete frost resistance, while the case that simultaneously applied of two factors has different effects on the frost resistance of different concretes. The degree of effect for basalt fiber mesh reinforced concrete can be listed in descending order as: ablation and chloride corrosion, ultraviolet and chloride corrosion, ablation and ultraviolet. For the alkali resistant glass fiber mesh reinforced concrete, it is ablation and chloride corrosion, ablation and ultraviolet, ultraviolet and chloride corrosion. Finally, the degree of effect for single factor is chloride corrosion, ablation and ultraviolet, in descending order.