JP2006132299A - Construction method for preventing deterioration in concrete structure and the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method (T&C) for preventing a deterioration in a concrete structure and the like, which are made highly durable by forming a dense impermeable layer on a material surface layer part. <P>SOLUTION: After the application of a permeable inorganic reactive improved material (crystal sealer) which is composed of an alkali silicate solution permeating through a porous material such as concrete and mortar, a permeable inorganic solution (silicone-based waterproof agent), which is composed of permeable curing silicone, is applied in a superposed manner after a lapse of a predetermined time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to prevention of deterioration of concrete structures and the like.

  Conventionally, methods for preventing deterioration of concrete structures and the like have been implemented such as surface protection by painting, quality improvement of concrete, and use of corrosion-resistant coated reinforcing bars. (For example, Patent Document 1)

JP, 2001-180993, A Concrete neutralization prevention method with weather resistance and its cement composition "Construction Technology Examination Lighting Report Civil Engineering Materials / Products / Technology T & C Corrosion Prevention (Construction Engineering Examination No. 0403)" Civil Engineering Research Center May 2005

The causes of deterioration of concrete structures are environmental factors such as scaling due to frost damage (surface peeling) and substances that permeate into the concrete surface (for example, salt and acid rain) cause deterioration of the concrete and the quality of materials such as concrete. There are factors and factors related to construction.
Furthermore, when these factors are combined, there are many cases where cracks are generated inside the concrete due to corrosion and expansion of the reinforcing bars at the same time as the concrete strength decreases, and the deterioration rapidly progresses to breakage.
In order to prevent this, a method has been adopted in which the surface is covered with epoxy coating to prevent frost damage and to prevent entry of salt. In addition, the use of high-quality concrete or reinforced concrete has been practiced to cover a large amount of reinforcing bars or to use corrosion-resistant reinforcing bars coated with epoxy resin.
These methods have the following drawbacks.
The effect of coating concrete surfaces decreases over time due to waves, wind and rain, sand drift, etc. In particular, organic coatings often peel off from concrete surfaces. Therefore, recoating is required every several years, and a large maintenance cost is required. In addition, the use of high-quality concrete, the increase in the covering of reinforcing bars, and the use of anti-corrosion reinforcing bars are factors that significantly increase construction costs.

  An object of the present invention is to solve the problems of conventional construction methods, and an object thereof is to improve the durability of a concrete structure safely and inexpensively including a life cycle cost.

  In order to achieve the above object, the present invention applies a permeable inorganic reaction type improving material (crystal sealer) containing an alkali silicate solution that penetrates into a porous material such as concrete or mortar, and then applies a certain time. After the elapse of time, a permeable inorganic solution (terios sealer) containing permeable curable silicone as a component is applied in layers. Provided is a method for preventing deterioration of concrete structures (T & C) by forming a dense water-impermeable layer on the surface layer of the material by the above operation.

First, by applying a silicate compound to the concrete surface, the silicate ions permeate and diffuse into the concrete surface layer, and the insoluble material mainly consists of silicate calcium produced by ion substitution reaction with the calcium ions in the concrete. By filling the capillary gap, the surface layer concrete composition is densified.
Next, by applying a silicon-based waterproofing material, the waterproofing material penetrates into the base material, and a durable water absorption preventing layer is formed on the concrete cover portion.
The combination of the two modifiers can be easily operated, and as a result, the pores in the concrete can be further filled with an inorganic insoluble substance as compared with one type of application. At the same time, it has a function to improve the resistance against the peeling stress generated in the concrete cover and suppress the deterioration.

Problems of the Invention

In the present invention, two different permeable paints are applied with a time lag to form a stable and durable impermeable layer of inorganic material on the inner surface of the concrete frame, thereby enhancing resistance such as scaling. is there.
Hereinafter, embodiments of the present invention will be described with reference to FIGS.

FIG. 1 shows the construction procedure of the present invention, and FIG. 2 is an explanatory photograph of a concrete construction example. In the procedure, the target structure is first examined, and the substrate is adjusted to remove surface latency, dirt, and deposits. With the concrete surface dry, apply crystal sealer and cure for 3 days. Next, Terios sealer is applied and cured for 4 hours to complete the construction.
Construction does not require special equipment or equipment, construction is relatively simple work, and the amount of paint scattered is small and does not contain environmental pollutants. In addition, the work period is short, the work at a high place is extremely small, the safety is high, and the protection against the scattering of paint to the surroundings is easy.

FIG. 3 shows the relationship between the amount of scaling and the number of cycles in the case of concrete surface treatment (T & C) according to the present invention and no treatment. FIG. 4 shows a picture of the situation.
According to this, the resistance to scaling of the concrete subjected to the T & C treatment can be confirmed.

  FIG. 5 shows a hardness comparison result between the concrete surface treatment (T & C) and the non-treatment according to the present invention. FIG. 6 shows the penetration depth of the T & C of the present invention into the concrete. From these results, increase in hardness and penetration depth can be confirmed by concrete surface treatment (T & C).

  FIG. 7 shows the results of water absorption test of concrete in the case of concrete surface treatment (T & C) and no treatment according to the present invention. It can be confirmed that the water absorption rate of the T & C-treated concrete is greatly improved and waterproof.

  As described above, the present invention is simply an operation of applying two kinds of colorless permeable inorganic paints to the surface with a brush or a spray, and penetrates into the concrete over time to form an impermeable layer. Accordingly, the durability of the structure main body is further enhanced by preventing the entry of harmful substances from the outside by being integrated with the base and having no peeling or swelling.

  Since the conventional paint is an opaque material, the paint used in the present invention is colorless and transparent, and therefore has a feature that it can be applied without changing the appearance of the concrete at all. Moreover, it can also color as needed.

  Furthermore, since the paint is inorganic and has a long durability and penetrates into the interior to form a layer and become stable, it has a life several times longer than that of the conventional coating method. Therefore, the maintenance cost can be greatly reduced compared to the conventional method.

The flowchart which showed the procedure of the construction of the present invention, and the concrete surface construction procedure Explanation photograph of concrete construction example of the present invention The relationship between the amount of scaling and the number of cycles for surface treatment (T & C) and no treatment Surface treatment (T & C) and no degradation photo Comparison of Vickers hardness with micro hardness tester for surface treatment (T & C) and no treatment Surface penetration (T & C) and untreated depth of paint Comparison results of water absorption rate of concrete with surface treatment (T & C) and no treatment Surface treatment (T & C) material components and material specifications

Claims (2)

After applying a permeable inorganic reactive modifier (Crystal Sealer) that contains an alkali silicate solution that penetrates into porous materials such as concrete and mortar, after a certain period of time, penetration using permeable curable silicone as a component Apply an inorganic mineral solution (Terios sealer) in layers. Deterioration prevention method for concrete structures, etc. by forming a dense impermeable layer on the surface layer of the material by the above work. A method for preventing deterioration of a concrete structure or the like by forming a dense water-impermeable layer on the surface layer of the material by individually applying each of the materials of claim 1.

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