JPH0241621B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method of waterproofing concrete slabs for bridges, rooftops, etc. Waterproofing of concrete slabs is carried out on bridge pavements and rooftops, but there are two methods of waterproofing: using heated asphalt as an adhesive, laying a waterproof sheet on top of it and paving with heated composite material, and The method used is to apply a solvent-based waterproofing material and pave a heated composite material. However, in the case of the former, there are concerns about fire and burn accidents caused by asphalt heating, and problems of blistering due to water vapor, while in the case of the latter method, there is a risk of environmental pollution mainly due to organic solvents that are harmful to the human body, and residual There is a concern that the solvent may cause the mixture to shift or form ruts. Therefore, in both cases, a reliable water-soluble room temperature waterproofing method is desired, rather than a definitive waterproofing method. The purpose of the present invention is to meet the above requirements by applying a prime coat to a concrete slab, applying an asphalt cement mortar on top of the prime coating, and impregnating about 1/3 of the reticulated fibers before the asphalt cement mortar hardens. The method is characterized in that a room temperature waterproofing agent is applied on top of the concrete, drying is carried out, and then heated composite material is laid down to integrate everything from the concrete slab to the composite material. The present invention will be explained below. Concrete slabs are generally prone to unevenness, and in particular, when cut, the concrete slab becomes extremely uneven. Therefore, asphalt emulsion is first dispersed as a leveling layer as a primer, and then asphalt cement mortar, which is a mixture of asphalt emulsion containing special rubber, cement, and sand, is raked to a level approximately 1 mm higher than the concrete slab. do. Before this asphalt cement mortar hardens, reticular fibers such as organic fibers and inorganic fibers are laid so as to be impregnated into the asphalt cement mortar to about 1/3 of the thickness of the reticular fibers, and wrinkles caused by rubber rake or brush are removed. Stretch out. At this time, the blending ratio of asphalt cement mortar and the thickness of the reticulated fibers are adjusted so that the reticulated fibers are impregnated to about 1/3 of the thickness. When the asphalt cement mortar hardens in this state, a waterproof base layer that also serves as a leveling layer is formed, and the reticulated fibers are firmly fixed on the surface of the asphalt cement mortar. A room-temperature waterproofing material is applied and impregnated onto the reticulated fibers on the hardened asphalt cement mortar using a rake, and then dried and cured to pave the heated composite material. However, if it is desired to shorten this drying period, that is, if there is a concern about rainy weather or if it is necessary to quickly pave the heated mixture, a special decomposing agent may be dispersed. The reticulated fibers may be nonwoven fabrics, woven fabrics, felts, etc. made of organic fibers or inorganic fibers. In addition, this construction can be applied not only to bridge pavement, but also to various concrete slabs, railways, etc. Examples will be described below. This example was conducted on the assumption that the cutting surface would be a concrete floor slab. Rubberized asphalt emulsion as a primer
0.5/m ² was spread, and asphalt cement mortar having the composition shown in Table 1 was raked at 2.0/m ² .
Immediately on top of this, a 3 mm thick polyester nonwoven fabric treated with a resin on one side was laid as a reticulated fiber with the resin treated side facing upward. After laying, it is possible to work on the non-woven fabric in about an hour, and a room-temperature waterproofing agent is applied at a rate of 1.5/ ^m2 , followed by dry curing. The room-temperature waterproofing material used was one whose main component was a rubber-containing blown emulsion having the properties of the room-temperature waterproofing material shown in Table 2 and the coating film properties of the room-temperature waterproofing material shown in Table 3. For this reason, there is very little damage to the waterproof layer caused by tires or caterpillars when paving the composite material, and there is no need for a mold release agent, which is normally used. Also, if you want to shorten the drying time, it is possible to disperse a special decomposer, but this was not used this time.
As a result, after applying the waterproof material, it was allowed to air dry for 12 hours, and a dense-grain heated composite material was paved.

【table】

【table】

[Table] Figure 1 shows the conditions in which the water permeability (waterproofness) of the sample was tested. In the drawing, 1 is a concrete floor slab, 2 is an asphalt cement mortar, 3 is a non-woven fabric, 4 is a room temperature waterproofing material, 5 is a glass cylinder placed on this room temperature waterproofing agent, and colored water 6 is poured into the glass cylinder 5 at a height of 250 mm. I put it in the container and left it for 48 hours. As a result, no water permeation was observed at all. FIG. 2 shows the shear strength test results of the above sample, where the vertical axis represents shear strength and the horizontal axis represents temperature, and the test was conducted at a loading rate of 5 mm/min and the shear force loading shown in FIG. 3. In the figure, 7 is a concrete slab, 8 is a waterproof layer, and 9 is a composite material. According to the present invention as described above, the unit cost of construction is low because all construction is performed at room temperature on site, and there is no risk of fire, burns, or organic solvents because the construction is water-based waterproofing. In addition, since the leveling layer is hardened using a chemical reaction of cement, the curing time is very short, and since the leveling layer is a composite of asphalt and cement, it has excellent flexibility, and the use of asphalt Forms an excellent primary waterproof layer. Furthermore, the reticulated fibers are firmly fixed by physically bonding with the asphalt cement mortar, and there is no fear that they will shift due to the effects of temperature, load, etc. Furthermore, since the waterproofing material uses reticular fiber as a core material, it has advantages such as extremely high tensile and tearing strength.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the water resistance test, Figure 2 is a graph showing the relationship between shear stress and temperature of the waterproof layer.
FIG. 3 is an explanatory diagram of a test that yields the numerical values shown in the graph of FIG. 2.

Claims (1)

[Claims] 1 Prime coat the concrete floor slab, apply asphalt cement mortar on top of it, and before the asphalt cement mortar hardens, apply the asphalt cement mortar so that the reticulated fibers are impregnated to about 1/3 of the thickness of the reticulated fibers. The asphalt cement mortar was laid on the concrete floor and the asphalt cement mortar was cured. After that, a room temperature waterproofing material was applied on top of it and it was dried and cured. After that, heated composite material was laid and the concrete slab and composite material were integrated. A concrete floor slab waterproofing construction method characterized by: