材料期刊网

目的：研究E16和E44两种水性环氧防水涂层材料对混凝土试块吸水性能的影响,以比较两种防水材料的性能。方法分别对两种防水涂层材料设计不同的涂层配合比和涂层厚度,进行混凝土毛细吸水实验,对比混凝土试块在喷涂防水涂层材料前后的毛细吸水系数变化,以此评价防水涂层材料对混凝土试块吸水性能的影响。结果涂层混凝土试块的吸水系数随涂层厚度的增加而减小。在一定范围内,涂层混凝土试块的吸水系数随n(胺氢)/n(环氧基)的增大而先减小,后增大。兼顾性能与成本,确定E16和E44两种防水涂层材料的配合比分别为n(E16)∶ n (Anquamine721)=1∶1,n (E44)∶ n(Anqua-mine 721)=1∶0.9,涂层喷涂厚度皆为(300±20)μm。此时,E16和E44两种涂层混凝土试块的吸水系数分别为各自对应空白混凝土试块的3.5%和3.4%。结论相比之下,E44防水涂层材料对混凝土试块吸水性能的影响较大。

ABSTRACT:Objective To study the effect on water absorption performance of concrete based on two water-based epoxy water-proofing coating materials E16 and E44 so as to compare the performance of the two kinds of waterproof materials. Methods Differ-ent mixture proportion and thickness were designed respectively for the two kinds of waterproofing coatings. The effect on water ab-sorption performance of concrete was evaluated through the concrete capillary water absorption test, by which the absorption coeffi-cient was compared before and after spraying the coatings on the concrete. Results The absorption coefficient of coated concrete block decreased with the increase of coating thickness. Within a certain range, the absorption coefficient of the coated concrete block first decreased and then increased with the increase of n( amine hydrogen equivalent)/n( epoxy groups) . With regard to both performance and cost, the proportion of E16 and E44 waterproof coating materials were determined as n ( E16 ) ∶ n ( Anquamine
721) = 1 ∶ 1, n(E44) ∶ n(Anquamine 721)=1 ∶ 0. 9, the coating thickness was (300 ± 20) μm, where, the water absorption coefficients of two kinds of coatings were 3. 5% and 3. 4% corresponding to the concrete block. Conclusion By contrast, E44 wa-terproof coating has more influence on the water absorption coefficient of the coated concrete block.