文档介绍：多孔混凝土材料的粘结强度
采用无砂大孔混凝土作小区道路与人行道结构层的施工方法及质量要求,基本上与室内地坪施工相同,不同之处只是面层的材料及施工方法,即面层采用透水砖,用砂干铺。在浇灌无砂大孔混凝土前,地基应平整、密实、均匀。无砂大孔混凝土最好采用机械搅拌,浇灌时不需振动,找平即可。抹面砂浆或细石混凝土应在无砂大孔混凝土胶凝后施工,力求干硬,以免形成浆液滚人无砂大孔的空隙中,宜采用1: (. 0 )的水泥砂浆。
Using macroporous concrete without sand village road and the pavement structure layer construction method and quality requirements, basically the same as the interior floor construction, the difference is only the surface of the materials and construction methods, namely the surface USES the permeable brick, dry sand. Before the water sand free macroporous concrete, foundation should be flat, dense and uniform. Macroporous concrete without sand is best by mechanical agitation, pour out, without vibration when leveling. Plaster mortar or concrete with fine stones should be in the absence of sand macroporous concrete construction after gelling, makes every effort to hard, so as not to form slurry rolled the gap no sand hole, appropriate USES 1: ( a 3. 0) cement mortar.
混凝土结构的破坏特征表明,水泥石与粗骨料界面的粘结强度,往往是混凝土中的最薄弱环节。尽管无砂大孔混凝土中的孔洞多、空隙大,但仍具有较高的强度。这是因为单一级配的骨料颗粒在混凝土结构中排列紧密,相互接触的几率增大,形成无数个大大小小的“拱结构”,使得骨料界面间的接触点能在外力作用下受力均匀、共同工作,保证了无砂大孔混凝土具有较高的强度。
Damage characteristics of concrete structure shows that the cement and aggregate bond strength of interface, are often the weakest link in the concrete. Although macroporous concrete without sand holes and gaps in the big, but it st