Abstract: The present invention is a method of sealant injection and the apparatus to be used therefor. The method is comprises the steps of injecting the sealant into a bellows-like injection container through a check valve and compressing the container resiliently by the spring means to inject the sealant into the cracks of the structures of such as concrete at a low velocity and under a low pressure constantly. The apparatus comprises an injection pipe to be adhered to the surface of the crack, a bellows-like injection container to be connected the pipe, a check valve provided between the injection container and the injection inlet and resilient means to compress the container.
Abstract: This invention provides a method for the manufacture of a fibrous plate rich in water resistance, which comprises the steps of uniformly mixing and dispersing fibrous raw material and finely divided bituminous substance in water, molding the resultant aqueous dispersion in the shape of a plate, and heating the plate with a hot press thereby melting the bituminous substance contained in the fibrous material and converting the plate into a fibrous plate having the bituminous substance uniformly dispersed therein. The fibrous plate obtained by this method excels in water resistance, weatherability, and thermal insulation and passes the standard specification concerning joint plates for use in concrete structures.
Abstract: A method for preparing a concrete joint sealant plate, comprising the steps of impregnating asphalt emulsion into fibrous plate under a reduced pressure and then drying it by means of a heating presser; and a concrete joint sealant plate produced therefrom.
Abstract: The present invention relates to a concrete joint sealant which is composed of a coal tar mainly consisting of a distillate obtained at up to 350.degree. C., vinyl chloride resin, coal pitch and a mixture of plasticizers, i.e., dioctyl phthalate and dioctyl adipate.
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