JP2001122651A - Surface preparation material composition for concrete structure and method for manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface preparation material composition for a cement structure, which is appropriately used for subjecting an internal surface of a concrete structure for sewerage or public water supply to surface preparation, or subjecting a surface liable to be exposed to a condition that deterioration of the surface possibly proceeds in, or wet condition, to surface preparation. SOLUTION: This composition consists of two materials, i.e., a wet admixture (material A) containing cement, an epoxy resin, aggregate having selected average particle size within the range of 65-250 μm and a wet dispersant, and a water-dilutable hardener (material B) containing a viscoelasticity adjusting agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an epoxy resin-containing coating composition for corrosion protection of concrete containing cement as a binder, and more particularly, to a method of adjusting the foundation on the inner surface of a concrete structure for sewerage or waterworks. The present invention relates to a curable composition suitable for adjusting the surface of a surface that is susceptible to deterioration or other humid conditions, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a spraying material using cement as a main binder,
It is well known that mortar and the like are used for the purpose of wall finishing of buildings, waterproofing materials, concrete structure protecting materials, flooring materials, pavement materials, deck covering materials, anticorrosion lining materials, adhesives, and the like. . About the cement mortar used for these, corrosion resistance and impact resistance, mechanical properties,
It is usually good to add a polymer binder such as natural or synthetic rubber latex, thermoplastic resin emulsion, or thermosetting resin (for example, epoxy resin) to improve chemical resistance, adhesiveness, workability, and the like. Is being done. As for polymer cement using an epoxy resin, cement, an aggregate, an epoxy resin, and a curing agent for the epoxy resin are generally mixed, and water is added to cure the cement.

On the other hand, when these polymer cements are practically used, the materials to be used, such as epoxy resin, hardener, cement, aggregate, and other additives, are mixed with water at a construction site and kneaded. To use. Due to the complexity of the mixing operation, a method of improving the operability by mixing in a factory in advance and forming two materials has been adopted. For example, a method comprising two materials, one material containing an epoxy resin and an aggregate, a dispersant and other additives, and a hardening agent containing cement (JP-A-56-501)
60, JP-A-3-69538), and after forming a liquid epoxy resin layer on the surface of the aggregate,
A method (Japanese Patent Application Laid-Open No. 8-81253) has been proposed which comprises a granular material having a cement layer coated on its surface and a hardener.

[0004] The use of a polymer cement using an epoxy resin is industrially useful, particularly since it improves corrosion resistance and adhesion. 2. Description of the Related Art In recent years, with regard to concrete structures, a decrease in durability due to neutralization, salt damage, and alkali-aggregate reaction of concrete has become a major problem. Furthermore, in sewage facilities and the like, concrete corrosion due to sulfuric acid generated by the oxidation of hydrogen sulfide by microorganisms in the wastewater treatment process is a social problem. Under such circumstances, an anticorrosion system having more excellent durability than ever has been demanded.

Conventionally, as an anticorrosion system for these concrete facilities, a water-based epoxy resin primer layer is applied on a layer of a water-based epoxy mortar material (base preparation material) applied to a surface layer of concrete, and an epoxy resin is applied on the primer layer. An anticorrosion system having a three-layer structure constituted by applying a top coat paint or a urea resin paint is generally applied. However, no matter how excellent the middle primer layer or top coat layer is, even if the surface adjustment of the concrete surface layer is not properly adjusted, the anticorrosion paint film defect will occur and the corrosion prevention will occur. The problem that the function is difficult to maintain remains, and the solution of this problem is an important problem.

In the case of a new concrete surface layer,
In many cases, a step is generated due to the influence of the concrete mold, and an inferior surface layer having a large number of pores and sponges solidified in a state of incomplete defoaming is formed. In addition, in the case of an existing concrete facility, it is inevitable that the surface will become uneven due to the various types of corrosion already described, resulting in a poor surface condition. When a base adjustment material is applied to these surface layers, the base adjustment material immediately enters the uneven portions or holes immediately after coating, and the air remaining in the holes or uneven portions is displaced and expelled, and the surface of the base adjustment layer is removed. There has been a problem in that a swollen portion or a missing portion of the base adjustment material occurs in the portion, and a continuous coating film cannot be obtained. In addition, when unevenness adjustment of the step is necessary, there is a place where the base adjustment material becomes partially thickened, so the applied base adjustment material may fall off and the unevenness adjustment of the step may be performed at once. The problem of being unable to do so remained. In order to solve these problems, conventionally, a method of removing these defects by dividing the foundation adjustment several times or applying as thick a film as possible has been generally performed. Defects can be removed if multiple layers are formed by several coatings, but the construction work requires a remarkably long time. Problems such as incomplete adjustment occur, and it has been desired to solve these problems. In addition, the application of these base adjustment materials is a work on site in terms of construction, so the performance of the anticorrosion film is of course, but the workability during construction and the complexity of mixing work and logistics are simplified as much as possible. From the viewpoint of
It was inevitably necessary to use two materials on the hardener side.

[0007]

The inventors of the present invention have conducted various studies on a two-layered base conditioner without causing any droop, and as a result, have found that bone, cement and epoxy resin having an average particle size of 65 to 250 μm are selected. Base material for concrete structures which is prevented from dripping by using a wet mixed material (material A) containing a material and a wet conditioner and a water-dilutable hardener (material B) containing a viscoelasticity adjuster It has been found that a conditioning composition has been obtained and the present invention has been completed, and an object of the present invention is to provide a base conditioning agent which does not cause dripping.

[0008]

That is, the gist of the present invention is to provide a wet mixed material (material A) containing cement, an epoxy resin, an aggregate having an average particle diameter of 65 to 250 μm, and a wet dispersant. It is a foundation adjusting material composition for concrete structures comprising two materials of a water-dilutable hardening agent (material B) containing an elasticity adjusting agent. However, the effect of the present invention cannot be obtained only by simply adding the alkali thickening type viscoelastic agent modifier to other materials independently. In the present invention, a uniform mixture can be obtained when a wet adjusting agent (material A), which is a base adjusting material, is mixed with a hardening agent (material B) containing a viscoelasticity adjusting agent while a wet adjusting agent is contained. It is done. The effect of the present invention cannot be obtained unless a uniform film of a continuous layer can be developed when applying the base adjustment material. That is, another requirement of the present invention is that a water-dilutable curing agent (material B) containing a viscoelasticity modifier is a uniform aqueous dispersion, and is composed of an alkali thickening type viscoelasticity modifier and a hydration promoting agent. If the agent is added,
These must be preliminarily and uniformly dispersed in the curing agent in advance, and the shape of the wet mixed material (material A) must be in a uniform wet mixed state. In order to obtain this wet mixed material (material A), first, the cement and the average particle size are 65 to 250.
It can be realized by a method of homogeneously mixing an aggregate having a diameter of μm and spraying or dropping an epoxy resin solution during or after mixing. Conventionally, when an epoxy resin is mixed with a cement material, the viscosity of the epoxy resin is so high that it is difficult to uniformly mix the cement with the cement, and there has been a problem that the epoxy resin tends to be aggregated.

According to the present invention, a uniform wet state of cement, aggregate, epoxy resin or epoxy resin solution, which has been considered difficult in the past, is made possible by a simple method. That is, the aggregate having the particle diameter selected in the first mixing step was used, and the degree of dispersion and mixing between the solids of the aggregate particles and the finer cement particles was increased to form a uniform solid mixture. Thereafter, an epoxy resin solution containing a wetting and dispersing agent is added, and at that time, an uneven mass of the epoxy resin solution is temporarily generated, but since the mass is in a wet (wet) state, a small mass is formed. It becomes a lump that can be easily unraveled with energy, and the moist lump is entangled in the gaps between the aggregates. This makes it possible to produce the mixed material (A). The prior art has made it possible to create a wet state by an easy mixing method without using a method such as coating an epoxy resin and cement in a layer on an aggregate or blending cement into a hardener. . As described above, the present invention is different from the multilayer structure known in the prior art. The present invention provides an epoxy resin wet mixture (material A) and a viscoelasticity adjuster,
Desirably, when an amine of a water-dilutable epoxy resin curing agent (material B) further containing a hydration accelerator and water as a hydrating agent of cement are mixed, the mixed system becomes extremely alkaline. By using a viscoelasticity modifier capable of effectively exerting the action of thixotropic and thickening in such a system state, the viscoelasticity modifier is used for cement particles, amine particles and epoxy resin. The effect of the present invention can be obtained by binding to the emulsion particles to form a network structure, exhibiting a thixotropic / thickening effect remarkably. In the case of a composition containing particles having a large specific gravity and relatively coarse, it has conventionally been extremely difficult to easily produce a thixotropic / thickening effect. ADVANTAGE OF THE INVENTION By this invention, supply of the base adjustment agent for anticorrosion systems which contributes to the improvement of the durability in a concrete structure became possible.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail.
According to the present invention, a sagging-preventing composition for a concrete structure has a wet mixed material (A material) containing cement, an epoxy resin, an aggregate selected from an average particle size of 65 to 250 μm, and a wetting and dispersing agent. ) And a water-dilutable curing agent (material B) containing a viscoelasticity modifier. The cement used in the material A of the present invention is a commonly used cement, for example, ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, moderately heated Portland cement, sulfate-resistant Portland cement, white cement And mixed cements such as blast furnace cement, colloid cement, silica cement, fly ash cement and the like, and these can be used alone or in combination of two or more.
In the present invention, if necessary, as a cement additive, a melamine resin sulfonate or a known antifoaming agent, a foaming agent, a setting accelerator, a setting retarder, a rust inhibitor, a waterproofing agent, a swelling agent, a dispersant, Agents and the like can be used.

As the aggregate to be added to the composition of the present invention, silica sand can be used. In using silica sand, it is necessary to select its particle size, No. 6 (average particle size 320 μm),
No. 7 (average particle size 190 μm), No. 8 (average particle size 100 μm)
The silica sand selected from the fine silica sand of m) is effective. Especially 8
No. silica sand is effective. No. 3 coarse particles (average particle size 138
0μm), No.4 (average particle size of 870μm), No.5 (average particle size of 430μm), the mixing and dispersion of cement, aggregate and epoxy resin or epoxy resin solution becomes uneven, and A material in uniform wet state becomes And it is difficult to realize the effects of the present invention. Although it is possible to mix other coarse silica sand with No. 8 silica sand,
No. silica sand must be blended in a proportion of at least 50% by weight of the entire silica sand. If the content is less than 50% by weight, the mixture of the cement, the aggregate and the epoxy resin dispersion is not uniform, and a lump which is difficult to easily disintegrate is formed, so that a uniform wet material A cannot be obtained. Further, even if the fine powder having a size of 53 μm or less is contained within the range of 10% by weight, the effect of the present invention is not impaired. On the other hand, as aggregates other than silica sand, river sand, crushed stone, crushed porcelain, crushed glass, glass beads, etc. can be exemplified, but in any case, the particle size is adjusted by referring to the particle size distribution applied to the case of silica sand. Can be used as well. The purpose of selecting the aggregate of the present invention is to satisfy the condition that the aggregate and the cement particles are uniformly dispersed and mixed, and if the function of crushing the lump temporarily generated when the epoxy resin is added is obtained. Is not limited.

Further, in the present invention, it is necessary to use a water-dispersible wetting and dispersing agent in order to enhance the wet dispersibility of the material A. Alcohols, glycols, and glycol ethers are effective as the wetting and dispersing agent that can be used, and typically, methanol, ethanol, butanol, isobutanol, and the like. Examples include ethylene glycol monoethyl ether, propylene glycol methyl ether and the like. These wetting and dispersing agents are used in the material A in a range of 4% by weight or less. Preferably 2% by weight or less, 4% by weight
Above this, it is not preferable to reduce the physical properties.
If necessary, other compounding agents include chopped strand glass fiber, synthetic resin short fiber, pulp, glass flake, mica powder, mica powder, flaky iron oxide, talc, clay, wax, bituminous material, gypsum, blast furnace slag Powder, microsilica and the like can be used, and can be used as appropriate according to the application.

The epoxy resin used for the material A in the present invention may be either a liquid or a solid, and has two or more epoxy groups in its molecule. Any substance that reacts and cures at room temperature may be used, and there is no limitation on the type and the like. Bisphenol A type and bisphenol F type epoxy resins are preferred from the viewpoints of versatility and price. The epoxy resin may contain additives such as an emulsifier, an antifoaming agent, and a thickening agent. Further, commercially available products may be used.

In the present invention, at least one of aliphatic polyamines, alicyclic polyamines and derivatives thereof is used as the water-dilutable curing agent component of the material B. The aliphatic polyamine is an aliphatic compound having at least two or more amino groups and / or imino groups having an active hydrogen atom which reacts with an epoxy group at normal temperature in a molecule, such as diethylenetriamine, triethylenetetramine, and the like.
Examples include tetraethylenepentamine, pentaethylenehexamine, diethylaminopropylamine, hexamethylenediamine, trimethylhexamethylenediamine, polyoxypropylenediamine, iminobishexylamine, and the like. The alicyclic polyamine is an alicyclic compound having at least two or more amino groups and / or imino groups having an active hydrogen atom which reacts with an epoxy group at normal temperature in a molecule, such as xylene diamine, 3,9 bis ( 3
-Aminopropyl) -2,4,8,10 tetraoxaspiro (5,5) undecane, N-aminoethylpiperazine, bis (4-aminocyclohexyl) methane and the like. These two polyamine derivatives include, for example, ethylene oxide adduct of aliphatic polyamine, epoxy resin adduct, modified aliphatic polyamine such as modified polyethylene polyamine, monoglycidyl ether adduct of alicyclic polyamine, epoxy resin adduct, Acrylic nitrile adducts, modified alicyclic polyamines such as fatty acid glycidyl ester adducts, polyethylene polyamine-fatty acids,
Polyamide amine which is a condensation reaction product of polyethylene polyamine-dimer acid, xylylenediamine-dimer acid, and the like, and modified products thereof are exemplified. A water-dilutable curing agent is selected from the above polyamines and polyamine derivatives. Here, the limitation to the water-dilutable curing agent is that the material B is stably maintained as a uniform aqueous solution when the viscoelasticity modifier and the hydration accelerator are finally mixed with the curing agent. Important and necessary. It is preferable that the curing agent component is a 50 to 100% by weight solution in these water-dilutable curing agents. B material is
A hydration accelerator (e.g., ethanolamine) having a function of accelerating hydration when an alkali-thickening type viscoelasticity modifier, a material A and a material B are mixed with these curing agents, and water are added to the disperser in this order. To obtain a water-diluted solution.

The hydration accelerator used in the present invention includes amine compounds among organic compounds, and alkanolamines are particularly effective. Specifically, diethanolamine, triethanolamine, or the like must be used and must be blended with the B material. The compounding amount is 10 cement.
It is blended in an amount of 0.05 to 0.25 parts by weight with respect to 0 parts. If the amount is less than 0.05 parts by weight, the acceleration effect cannot be obtained,
If the content is 0.25 parts by weight or more, the viscosity increases, the coating workability deteriorates, and finally the appearance becomes poor. Inorganic compounds,
For example, acidic systems such as chlorides CaCL ₂ , NaCL, and KCL, nitrites, and sulfates inhibit the drooling effect and are not suitable for the present invention. As for the viscoelasticity modifier which is an important element of the present invention, generally, there are inorganic type, metal soap type, natural product type, cellulose derivative type, polycarboxylic acid type, polyether derivative type, and polyvinyl type. In this case, a polymer type having a strong network structure of a polymer is applied. Optimally, a polycarboxylic acid derivative system is preferable, and the material A exhibits strong alkalinity, and the p material is mixed during the mixing of the material A and the material B.
Considering that the H value range is maintained at 11 or more, an alkali thickening type viscoelasticity modifier is more preferable because it enhances the effect of the present invention. The compounding amount is preferably 10 cement.
It is blended at a ratio of 0.1 to 0.25 parts by weight with respect to 0 parts. When the amount is less than 0.1 part by weight, the effect of sagging and leveling properties is reduced, and when the amount is more than 0.25 part by weight, the curability and coating workability are deteriorated, and the adhesion strength is lowered, which is not preferable. The materials selected in this way are mixed with the wet mixture material (material A) and the water-dilutable hardener solution (material B), respectively, to obtain the base material adjusting composition of the present invention. The mixing ratio of the two materials is the wet mixed material (material A) 7
The base adjusting material of the present invention is completed by preparing a curing agent solution (material B) in an amount of 5 parts by weight so that it can be used in a fixed ratio to 25 parts.

Hereinafter, the method for producing the wet mixed material (material A) and the curing agent solution (material B) of the present invention will be exemplified, but the present invention is not limited to the following reference examples. Reference Example 1 (cement, epoxy resin, average particle size of 65 to 65)
Production example of wet mixed material (material A) containing aggregate and wet dispersant selected from 250 μm) In a 5 L universal mixer, 337.5 g of silica sand No. 6 and silica sand 8
2175 g of Portland cement is added to 975 g of No. 9 and stirred at room temperature for 10 minutes. Next, 262.5 g of an epoxy resin solution containing 37.5 g of a wetting and dispersing agent was sequentially charged, and 30
Stir and mix for minutes. Immediately after the addition of the liquid component, a lump of mass was observed. However, as the mixing time progressed, the material A in a uniform wet state was obtained when the mixture was loosened and stirred for 30 minutes.

Reference Example 2 (Production example of water-dilutable curing agent (material B) containing viscoelasticity modifier) 225 g of water-dilutable curing agent was charged into a mixer having a 2 L dispersing stirrer. 0.3125 g of a sum accelerator (triethanolamine) 0.3125 g of a polycarboxylic acid derivative-based alkali thickening type viscoelasticity adjuster is added, and mixed at 200 rpm for 5 minutes at room temperature. Then add water to 96
8.75 g is gradually charged in 10 minutes, and 15 minutes after the charging is completed.
After stirring and mixing for a minute, a hardener solution (material B) was obtained.

Materials A and B were obtained in the same manner as in Reference Examples 1 and 2, except that the amounts were changed based on the formulations shown in Tables 1, 2 and 3. Tables 1, 2 and 3
Numerical values indicate parts by weight.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

[Table 3]

The underlayer adjusting material composition of the present invention is prepared by weighing a predetermined amount of each of the materials A and B produced according to the reference examples before construction, and using a hand mixer, a concrete mixer, a shovel,
After sufficiently kneading with a trowel or the like until the whole becomes uniform, coating can be performed by trowel coating, spatula coating or the like.

[0023]

The present invention will be described in detail with reference to the following examples. Examples 1 to 7 and Comparative Examples 1 to 7 Examples 1 to 7 and Comparative Examples 1 to 7 were mixed with the compounding agents shown in Tables 1 and 2 at the compounding ratios shown in the respective tables. And B material were formed. In Comparative Example 1, when the chloride calcium chloride was used, Comparative Example 2 was used.
And Comparative Example 3 when the average particle size of the aggregate was large, Comparative Example 4
Does not include a wetting and dispersing agent, Comparative Example 5 includes a case where the alkali thickening type viscoelasticity modifier is increased, Comparative Example 6 includes a case where triethanolamine is increased, and Comparative Example 7 includes a case where the average particle size of the aggregate is The case where the aggregate powder (average particle size is 10 μm) is added is shown as a small case. Next, the materials A and B were mixed and kneaded sufficiently so as to form a uniform dispersion mixed system as a whole, thereby obtaining a base adjuster for concrete structures. The obtained surface conditioner for concrete structures was subjected to a coating test on a concrete surface. Table 4 shows the results.

[0024]

[Table 4]

The coating test of the substrate adjustment material was carried out by using the test concrete, preparing the substrate adjustment material compositions of Examples and Comparative Examples, observing the appearance properties of the material A, and applying 1 kg / m of the coating amount on the concrete surface. ^The specified B material was uniformly mixed so that the film thickness became 0.5 mm in ² , and the workability, droolability, curability, appearance of the paint film, impregnation property of the top coat and adhesion strength of the paint film were measured and compared. I got

The criterion was determined by the following method.外 観 Appearance of material A No lump in wet condition Judgment ○ Property Lump in lump exists in wet condition. Judgment × ◇ Coating workability Soldering iron is good at coating, and adaptability to the base is good ・ ・ ・ ・ Judgment ○ Poor cutting iron at coating, poor adaptation to the base ・ ・ ・ ・ Judgment × ◇ No sagging 5 minutes after applying 3 mm thickness on vertical surface Judgment ○ Sagging phenomenon occurs 5 minutes after applying 3 mm thickness on vertical surface Judgment × ◇ Curability 20 ° C Touch hardening after 10 hours in a 60% humidity atmosphere ··· Judgment ○ Uncured after 10 hours in a 20 ° C and 60% humidity atmosphere ··· Judgment × ◇ Coating appearance A smooth surface without swelling on the coated surface was obtained.・ ・ ・ Judgment ○ Swelling occurs on the coated surface and a smooth surface is not obtained ・ ・ ・ Judgment × ◇ Top coat impregnation The primer applied one day after application has penetrated ・ ・ ・ Judgment ○ The primer applied one day after application did not penetrate ・ ・ ・ Judgment × ◇ Adhesive strength Measure the adhesive strength after curing for 14 hours in a 20 ° C., 60% humidity atmosphere. 10 kg / cm ² or more Judgment ○ 10 kg / cm ² or less Judgment ×

[0027]

According to the present invention, it is possible to produce a uniform wet state of an aggregate and an epoxy resin whose cement, particle size is adjusted, and an epoxy resin wet mixed material (material A) which is stably and uniformly dispersed and mixed with an alkali. By mixing two materials of a water-dilutable epoxy resin curing agent (material B) containing a visco-viscoelasticity modifier and a hydration accelerator, alkalinity is maintained at the time of mixing and alkali thickening contained in material B -Type viscoelasticity modifier binds to cement particles, amine particles, and epoxy resin emulsion particles to form a network structure, and to exhibit a thixotropic / thickening effect, thereby preventing drooling and improving the composition of a concrete base preparation material. I was able to find things. This makes it possible to improve drooling and dramatically improve the ability to adjust the foundation of concrete, despite the fact that the composition has a heavy specific gravity and a relatively coarse particle size.
In addition, on the construction site, it is possible to apply a thick coating with a single coating, suppress the occurrence of blisters from pores, adjust the base consisting of a continuous layer, and simultaneously improve corrosion prevention and shorten the construction period be able to.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 41/65 C04B 41/65 // C04B 103: 12 103: 12 103: 40 103: 40 111: 26 111 : 26 (72) Inventor Osamu Arasawa 1 of 10 Techno Park, Mita-shi, Hyogo F-term (reference) 4M012 PA04 PB15 PB20 PB33 PC04 PC13 PE01 4G028 DA01 DB01 DB11

Claims (8)

[Claims] Cement, epoxy resin, average particle size of 6
For concrete structures consisting of two materials: a wet mixture (material A) containing an aggregate and a wet dispersant selected from 5-250 μm and a water-dilutable hardener (material B) containing a viscoelasticity modifier. Substrate adjusting material composition. 2. The base conditioner composition for a concrete structure according to claim 1, wherein the water-dilutable curing agent is a water-soluble modified amine-based curing agent. 3. The base conditioning material composition for a concrete structure according to claim 1, wherein the aggregate is silica sand selected from an average particle size of 65 to 250 μm. 4. The base conditioner composition for a concrete structure according to claim 1, wherein the material A further contains an additive such as an emulsifier, a thickening agent and the like. 5. The base conditioner composition for a concrete structure according to claim 1, wherein the material B further contains an alkali thickening type viscoelasticity adjuster and a hydration accelerator. 6. An aggregate having 4 aggregates per 100 parts by weight of cement.
7 to 40 parts by weight of a water-dilutable curing agent containing 0 to 100 parts by weight, 5 to 25 parts by weight of an epoxy resin, and 0.05 to 1.00 parts by weight of a viscoelasticity modifier. 5
The underlayer conditioning material composition for a concrete structure according to the above. 7. The base conditioner composition for a concrete structure according to claim 1, wherein the curing agent component is blended in an amount of 1.2 to 2 theoretical equivalents relative to the theoretical equivalent of the epoxy group of the epoxy resin. 8. An epoxy resin solution containing an epoxy resin and a wetting and dispersing agent, and if necessary, an additive such as an emulsifier and a thickening agent, is sprayed or dropped during or after mixing with the cement and the aggregate. 2. The wet admixture (material A) according to claim 1, which comprises a cement, an aggregate, an epoxy resin and a wet dispersant.
How to manufacture.