JPS6355254A - Method for modifying surface of concrete structure - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is useful for improving the abrasion resistance, impact resistance, and chemical resistance of, for example, floors of factories and cold storage warehouses, bottom plates and walls of water storage tanks, and humid pipes. This invention relates to a method for surface modification of concrete structures that require durability such as durability.

(Prior Art) Conventionally, methods for surface modification of this type of concrete structure include impregnating the surface of concrete after hardening with a polymer, or applying a resin coating material or paint. ing.

C) Problems to be Solved by the Invention) However, the conventional surface modification method for concrete structures uses a modification material different from concrete, and has problems with the layering strength of the modification material, resulting in peeling. This has the disadvantage that the surface of the concrete structure cannot be given satisfactory durability.

(Ninth Means for Solving the Problems) An object of the present invention is to provide a method for surface modification of concrete structures that eliminates the above-mentioned disadvantages. A surfactant is applied to the surface of the concrete to cause poor setting in the concrete on the surface, and after the internal concrete has hardened, the poorly set concrete is removed, and the gold is removed from the poorly set concrete by sinking. Consists of pouring strength mortar.

As a surfactant that acts on the surface of concrete,
For example, there are no limitations on the type of concrete used, as long as it causes poor setting in concrete that is mainly composed of ligdisulfonic acid salts, oxycarboxylic acid salts, etc. The surfactant is generally 15 to 50 vt%.
Generally, the aqueous solution is applied directly to the concrete surface by spraying, brushing, etc. to make the surfactant act on the concrete. Hey, Funkri
The surfactant may be applied at the same time as the concrete is placed.

(9) Concrete caused by poor setting due to the above-mentioned surfactant is removed with a water jet, wire brush, etc.
As a result, the concrete that has caused poor setting is removed, and the surface of the concrete becomes rough and aggregates protrude from the surface.

As mentioned above, the types of high-strength mortar to be cast on the surface of concrete from which poor setting has occurred are removed, such as ultra-dense mortar, ultra-high-strength mortar, etc., depending on the purpose of modifying the concrete surface. Just choose.

(Example) Next, embodiments of the present invention will be described with reference to the accompanying drawings.

The drawing shows an example in which the present invention is applied to surface modification of a concrete floor. First, as shown in the first drawing, a lignosulfonate-based surfactant 2 is applied to the surface of poured uncured concrete 1. A 20 wt % aqueous solution is applied by brushing to cause the surfactant 2 to act on the surface of the concrete 10, causing poor setting in the concrete 1 on the surface. Next, after the inside of the concrete 1 has hardened, the poorly set concrete 3 is removed with a water jet. After the poorly set concrete 5 is removed, the surface of the concrete 1 is roughened as shown in the second figure, and aggregates 4 protrude from the surface. Next, as shown in FIG. 3, super-dense mortar 5 is placed on the surface to a depth of approximately 10 mm. In this way, the existing concrete 1 and the post-cast ultra-dense mortar 5 are firmly integrated through the roughened surface from which the aggregate 4 protrudes, and the surface of the concrete 1 is modified by the ultra-dense mortar 5. It will be done.

(Effects of the Invention) As described above, according to the method for surface modification of a concrete structure of the present invention, a surfactant is applied to the surface of concrete to cause poor setting, and after removing the poorly set comfre... Since high-strength mortar is placed on the roughened concrete surface where aggregates protrude, the existing concrete and the post-cast high-strength mortar are poured through the roughened surface where aggregates protrude. It has the effect that the surface of the concrete can be well modified in terms of durability such as abrasion resistance, impact resistance, and chemical resistance by integrating it with the Tomodaka strength mortar.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of the implementation of the method of the present invention, where Figure 1 is a cross-sectional view of the next state in which a surfactant is applied to the surface of concrete and no setting failure occurs; The figure is a cross-sectional view of the next state after removing poorly set concrete, and FIG. 3 is a cross-sectional view of the state after high-strength mortar has been cast. 1... Concrete 2... Surfactant 3...
・Poor setting concrete 4...Aggregate 5...Outside high strength mortar 2
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Claims (1)

[Claims] Before the concrete hardens, a surfactant is applied to the surface of the concrete to cause poor setting in the concrete on the surface, and after the internal concrete has hardened, the poorly set concrete is removed, and then the poorly set concrete is removed. A method for surface modification of concrete structures, which consists of placing high-strength mortar on the surface of concrete.