JPS6027667A - Heat insulating and waterproofing process - Google Patents

Abstract

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

Description

[Detailed description of the invention] The present invention relates to a method for insulating and waterproofing concrete structures.

Waterproofing of concrete structures, especially rooftop waterproofing, is essential work, but in recent years energy conservation has become an issue, and insulation work is often performed in conjunction with this work.

The current insulation and waterproofing method involves first preparing the surface of the concrete structure by removing laitance by chiseling, adjusting unevenness using mortar, cement filler, etc. as necessary, and then applying asphalt waterproofing. Perform ordinary waterproofing treatments such as sheet waterproofing, paint film waterproofing, and mortar waterproofing, and then apply foamed polyethylene (PI)
A heat insulating board made of F) or expanded polystyrene (P19F) is applied, and a protective layer is provided on top of it with cement mortar.

However, this method of pasting insulation boards on top of waterproofing has problems with the adhesion of the seams between the insulation boards and the adhesion between the insulation boards and the base, and is not waterproof at all. equal. Therefore, if there is a crack in the underlying waterproof layer, you are immediately exposed to the risk of water leakage.

Furthermore, since the heat insulating board is flexible, the protective layer of cement mortar provided on the insulation board is prone to cracking if it is thin, and if it is thickened to prevent cracks, it becomes extremely heavy.

In order to solve this problem, the present inventors conducted extensive research and discovered a heat insulating composition that has excellent heat insulating properties, waterproof properties, flexibility, adhesion, and workability, and developed the method of the present invention. completed.

That is, in the present invention, after waterproofing the concrete surface of the building frame, 100 parts (by weight, the same shall apply hereinafter) of hydraulic cement and a synthetic resin emulsion and/or synthetic rubber latex with a minimum film forming temperature of 40° O or less are applied. 50 in solid content
~200 parts of a foam-forming agent;
This is a heat insulation and waterproofing method for concrete structures, which is characterized by forming a heat insulating protective layer containing bubbles.

The most common waterproofing treatments applied to the concrete surface of a building are asphalt waterproofing, sheet waterproofing, paint film waterproofing, and mortar waterproofing.

Asphalt waterproofing is a waterproofing treatment in which 6 to 5 pieces of asphalt roofing are laminated using molten asphalt as an adhesive to form a waterproof layer.

Sheet waterproofing is a waterproofing treatment in which sheets of synthetic polymers such as vulcanized rubber, non-vulcanized rubber, vinyl chloride resin, ethylene resin, etc. are attached to waterproof areas and the sheets are waterproofly bonded to each other.

Paint waterproofing is a waterproofing treatment in which a coating material such as urethane rubber, acrylic rubber, chlorprene rubber, acrylic resin, or rubber asphalt is applied to the waterproof area and formed into a waterproof layer. .

What is mortar waterproofing? Waterproofing mortar made by mixing admixtures such as sodium silicate, calcium chloride, and fatty acids into the mortar to increase its waterproofing properties is applied to the concrete base by troweling it for 10 to 2 hours.
This is a waterproof treatment applied to a thickness of mm.

In the construction method of the present invention, a paste prepared by kneading the above-mentioned heat-insulating composition with an appropriate amount of water is applied to the surface of these waterproofed concrete structures to provide a heat-insulating effect, and therefore the work efficiency is extremely high.

Furthermore, since this heat-insulating composition contains a large amount of synthetic resin or synthetic rubber and air bubbles, it is flexible and strong, has excellent heat-insulating properties, and has good adhesion, so it can be used on any substrate.

That is, according to the present invention, a seamless heat-insulating waterproof layer can be formed by simply applying the heat-insulating composition described above on top of the various waterproof treatments described above, and the heat-insulating layer itself is dense and waterproof. It has excellent adhesive properties, does not crack, and adheres extremely tightly to the base, so even if the waterproof layer on the base should crack, there is very little risk of water leakage.

Furthermore, since there is no need to provide a protective layer of cement mortar, it is lightweight and has good construction efficiency.

Its surface can be painted for weatherability, abrasion resistance, or cosmetic purposes. Suitable paints to be used include synthetic resin emulsion paints, solvent-based paints, and cement-based paints.

The hydraulic cement used in the present invention includes ordinary Portland cement, Portland cement such as early strength Portland cement, mixed cement such as blast furnace cement and fly ash cement, and special cement such as alumina cement.

The synthetic resin emulsion used in the present invention includes a
, the minimum film forming temperature obtained by emulsion polymerization of a β monoethylenic monomer in an aqueous system is 40° C. or lower. Therefore, it may be an aqueous emulsion obtained immediately after emulsion polymerization, or it may be a redispersible powder emulsion that can be redispersed and returned to an emulsion when added to water dried by spray drying or freeze drying. good. If the minimum film forming temperature exceeds 40°C, the cushioning properties will be poor and it is not suitable.

Examples of α and β monoethylenic monomers include vinyl acetate, vinyl tetrapionate, vinyl esters such as vinyl esters of higher carboxylic acids branched at the α position, acrylic acid, methacrylic acid, maleic acid, itaconic acid, These include unsaturated acids such as crotonic acid, and esters of these with aliphatic alcohols, vinyl chloride, vinylidene chloride, ethylene, styrene, acrylamide, acrylonitrile, N-methylolacrylamide, divinylbenzene, and the like.

As the synthetic rubber latex used in the present invention, styrene-butadiene rubber latex, PTFF prene rubber latex, acrylonitrile-butadiene rubber latex, methyl methacrylate-phtadiene rubber latex, butadiene rubber latex, etc. can be used. Furthermore, the aforementioned synthetic resin emulsion and synthetic rubber latex can be used together.

As the foam forming agent, one or two selected from synthetic resin foam particles such as foamed polystyrene particles, foamed polyurethane particles, and foamed urea resin particles, inorganic foam particles such as perlite, vermiculite, and shirasu balloons, and foaming agents. More than one species is used. The particle size used is an average diameter of about 50 microns to about 10 mm, preferably 0.
- 1 mm to 3 mm is used.

As the foaming agent, a surfactant, a combination of aluminum powder and an alkali, etc. are used.

To produce the composition used in the present invention, hydraulic cement, synthetic resin emulsion, and cell forming agent may be uniformly mixed.

In addition, the proportion of bubbles in the composition (bubble content) is 10 to 5.
0% by volume is appropriate.

When the synthetic resin emulsion is in the form of an aqueous emulsion, the hydraulic cement starts a hardening reaction upon mixing, so it must be mixed immediately before use.

On the other hand, if the synthetic resin emulsion is a redispersible powder emulsion, no hydraulic reaction will occur even if the three components are mixed, so all you need to do is add water and knead before use. It can be stored as a preparation.

For every 100 parts of hydraulic cement, 50 to 200 parts of synthetic resin emulsion is used in terms of solid content, but if it is less than 50 parts, when a heat insulating layer is constructed, the flexibility will be poor and it will not be able to follow the expansion and contraction of the base. This may cause cracks to form. In addition, the adhesion to the base is insufficient.Furthermore, since the emulsion particles exhibit waterproofness by filling the gaps in the hydraulic cement mortar, if the amount is less than 50 parts, the waterproofness of the insulation layer may be insufficient. become.

If more than 200 parts are used, the amount of hydraulic cement will be insufficient, resulting in insufficient toughness and water resistance.

When using synthetic resin foam particles or inorganic foam particles as a foam forming agent, the kneaded product can be coated as is to form a heat insulating layer, but when using a surfactant as a foaming agent, kneading A heat insulating layer must be formed by applying the mixture after stirring vigorously to sufficiently incorporate bubbles.

In addition, when using a foaming agent such as aluminum powder and alkali that forms bubbles by gas generation, the foaming agent must be added immediately before construction, stirred quickly and thoroughly, and then applied to form a waterproof layer. Must be.

Appropriate construction machines include mortar mixers, paint dispersers, ribbon blenders, etc. for kneading materials, and snake-type, piston-type, A pressure-feed spraying machine such as a squeeze type is suitable.

The construction method of the present invention is used for insulation and waterproofing of rooftops and outer walls of concrete structures such as houses and offices.

Next, the present invention will be explained by giving production examples, examples, and comparative examples.

Production Example 1 100 parts of ordinary Portland cement, ethylene content of 18% (weight %, same hereinafter), concentration of 50% ethylene-
160 parts of vinyl acetate copolymer emulsion (solid content) and expanded polystyrene with a particle size of 0.1 to 3 mm (Myball,
40 parts of Ryowa Sanshi ■ (trade name) were uniformly kneaded to obtain a paste-like heat insulating composition.

Production example 2 100 parts of alumina cement, ethylene content 15%,
80 parts of a redispersible powder emulsion obtained by spray drying an ethylene-vinyl chloride-vinyl acetate copolymer emulsion with a vinyl chloride content of 25% and a concentration of 50%, and a particle size of 0.5 to
1.5mm foamed obsidian (product name: Asano Pearlite 4)
No.) was uniformly kneaded to obtain a powdery heat insulating composition.

When using, add an appropriate amount of water and knead to form a slurry.

Production Example 6 100 parts of ordinary Portland cement and 50% styrene-acrylic acid ester copolymer emulsion 18
0 parts (solid content) and 5 parts of sodium lauryl sulfonate were mixed and a large amount of foam was incorporated using a high-speed stirrer to obtain a heat insulating composition.

Production Example 4 In Production Example B, 1 part of aluminum powder was added and mixed in place of sodium lauryl sulfonate to obtain a heat insulating composition containing a large amount of bubbles due to the generated hydrogen gas.

Examples 1 to 7 An asphalt waterproof layer (5 mm
A butyl rubber sheet waterproof layer (2 mm thick), a metal soap waterproof mortar layer (20 mm thick), and a urethane coating waterproof layer (2 mm thick) are applied on top of this waterproof base.
Using the heat insulating compositions of Production Examples 1 to 4, a heat insulating layer (20 mm
layer) to form a heat insulating and waterproof layer with the combinations shown in Table 1. After curing, the weight per unit area, adhesive strength with the base, and thermal conductivity (λ) of the heat-insulating waterproof layer were measured as follows.

Weight/area (9/am”): Weight per unit area of the heat-insulating waterproof layer.In the case of the comparative example, the protective layer of cement mortar is also included.

Adhesive strength k,/cm2): Tensile strength between the base concrete and the heat-insulating waterproof layer.

Thermal conductivity (λ逗aa171blood・t): Thermal conductivity of the heat insulating waterproof layer. In the case of a comparative example, a retention layer of cement mortar is also included.

At the same time, we also investigated the number of work days required to complete the construction work.

The results are shown in the lower part of Table 1.

Comparative Examples 1 to 5 In the same manner as in the examples, foamed polyethylene or foamed polystyrene with a thickness of 10 mm in the combinations shown in Table 1 was adhered to the waterproofed base using an emulsion adhesive, and then light walking protection was applied. Mutsumi mortar was applied to a thickness of 5 mm, and the weight per unit area of the heat-insulating waterproof layer, adhesive strength with the base, and thermal conductivity (λ) were measured.

At the same time, we also investigated the number of work days required to complete the construction work.

The results are shown in the lower part of Table 1.

Thermal conductivity of cement mortar and concrete ('A
) are 1.1 and 1.4 Kca//mh-oO, respectively, so the thermal conductivity (λ) of the example shown is slightly larger than the comparative example, but both are sufficient compared to cement mortar and concrete. This is a small number.

Procedural amendment (voluntary) Commissioner of the Patent Office Kazuo Wakasugi 1 Display of the case 1972 Application for protection and maintenance permission No. 165508 2 Name of the invention Insulation and waterproofing method 3 Person making the amendment Relationship with the case Patent applicant 4 Agent 〒5 Rejected 5. Subject of amendment (1) Contents of amendment in column 6 of “Detailed Description of the Invention” of the specification (1) Bottom line of page 13 of the specification “5mm J to r 60
Correct as mm J.

that's all

Claims (1)

[Scope of Claims] 1. After waterproofing the concrete surface of the building frame, 100 parts by weight of hydraulic cement and 50 parts by weight of synthetic resin emulsion or modified or synthetic rubber latex with a minimum film forming temperature of 40°C or less are added. 1. A method for insulating and waterproofing concrete structures, comprising coating with a composition consisting of ~200 parts by weight and a bubble forming agent to form a heat insulating protective layer containing bubbles. 2. The insulation waterproofing method according to claim 1, wherein the waterproofing treatment is selected from asphalt waterproofing, sheet waterproofing, paint film waterproofing, and mortar waterproofing. 6. The insulation waterproofing method according to claims 1 and 2, wherein the synthetic resin emulsion is an aqueous emulsion. 4. The insulation waterproofing method according to claims 1 and 2, wherein the synthetic resin emulsion is a redispersible powder emulsion. 5. The insulation waterproofing method according to claims 1 to 4, wherein the cell forming agent is one or more selected from synthetic resin foam particles, inorganic foam particles, and foaming agents.