RELATIONSHIP BETWEEN DURABILITY AGAINST DYNAMIC LOAD OF RESIN FLOOR COATING AND SURFACE LAYER QUALITY OF SLAB CONCRETE

Abstract

 Resin floor coating is used for the floors such as logistics facilities and production facilities. Those floors could be subjected to great complicated load by guided vehicles. Due to the load, the cases are reported that the problems with the floors occur. It is expected that durability against dynamic load of Resin floor coating is strongly affected by surface layer quality. Therefore, it is very important to secure surface layer quality. However, there are few cases that the relationship between durability against dynamic load of Resin floor coating and surface layer quality is considered. So, there is a lack of knowledge to avoid the problems in advance.

 Thus, in this study, the relationship between durability against dynamic load of Resin floor coating and surface layer quality is considered. The targeted dynamic load is the load applied when the casters of such as guided vehicles are carve. In addition, the effects of polisher and the process for finishing work and curing among the process for constructing slab are considered.

 Some various Concrete specimens are prepared. (Reference Fig. 1) The preparing conditions are showed in Table 1, 2. Especially, by varying finishing work conditions like Table 3, the specimens with various surface layer qualities are prepared. The concrete specimens are measured three kinds of surface layer quality. Those are surface intensity, moisture vapor emission, surface roughness. Table 4 shows the grades of surface intensity. Also, measurement of Tensile adhesive strength of slab and Resin floor coating was done.

 Twist load tester developed in this study was used for the durability against dynamic load test. This tester can reproduce the load applied when the casters of such as guided vehicles are carve. In order to reproduce real load, 5000N and 10000N load were chosen in the test. (Reference Fig. 2, Photo 1)

 The results are as follows: First, Fig. 3 shows the measurement results of surface intensity, moisture vapor emission. The result that the more finishing work conditions are improved, the more surface intensity increase, and the more moisture vapor emission decrease was obtained. It is also proved that surface intensity and moisture vapor emission have good correspondence with each other. (Reference Fig. 4)

 Secondly, the relationship of surface intensity between before and after polish is considered. The result shows surface intensity of polished specimens gets larger than before polish. (Reference Fig. 5)

 Finally, the relationship between surface layer quality and durability against dynamic is considered. As a result, it is proved that in addition to preparation of slab by the process shown in this study, securement of appropriate surface intensity could decrease the possibility of primary problems. (Reference Fig. 9, 10)