KR0153247B1 - Process for the preparation of mortar - Google Patents

Abstract

It provides a self-leveling mortar, and also has a high fluidity holding time with high fluidity holding time. In addition, the present invention provides a method of transporting such a high-molecular mortar to the construction site by an agitater car.

Highly lubricated mortar containing (meth) acrylic acid copolymers and aggregates of specific particle diameters, in addition to substrates made from specific compositions of blast furnace chain slag powder, cement and gypsum. In transporting such high-molecular mortar to the construction site by edge data, the high-molecular holding mortar time is controlled by adjusting the content of blast furnace slag and gypsum to the clean car powder contained in the high-molecular mortar. .

Description

How to supply high fluidized mortar as high-grade mortar and self-leveling phase material

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high fluidization mortar capable of freely flowing and easily forming a horizontal plane, having a self leveling property, less drying shrinkage, and capable of retaining fluidity for a long time. . Moreover, in using such a high fluidization mortar as a self-leveling phase material, the present invention relates to a method for supplying a high fluidization mortar as a self-leveling phase material which controls the high fluidity holding time and transports it to the construction site by edge data. .

Background Art Conventionally, self-leveling materials of gypsum-based and cement-based have been developed and are used for the upper and lower substrates of structures. However, the gypsum self-leveling material has the disadvantages such as lack of water resistance, low surface strength, and the cement self-leveling material has the disadvantages of poor fluidity and easy cracking, and both of them have the disadvantage that the fluidity rapidly decreases in a short time. There is this.

In general, for cement products such as concrete and mortar, it is preferable to prepare them at the factory and transport them to the construction site by edge data truck for the complicated control of quality control and kneading. As for the self-leveling material, it is preferable to prepare it at the factory and transport it to the construction site by edge data lane due to the complicated control of quality control and kneading. Because of this shortcoming, there is a problem that when it is prepared at the factory and transported to the construction site by the edge data car, the fluidity decreases during transportation, and when the construction site is reached, it does not have an effect as a self-leveling phase material.

MEANS TO SOLVE THE PROBLEM The present inventors studied in order to solve the fault of the conventional self-leveling material, and are the self-leveling containing blast furnace crushed slag powder in Unexamined-Japanese-Patent No. 57-92558, 61-146742, 62-676752, etc. Although the ash was proposed, it was improved in terms of fluidity, cracking resistance and fluid holding time, but it was not sufficient considering the performance required in practical use.

As a result of intensive studies, the present inventors have found that when a substrate made of blast furnace slag powder, cement and gypsum is in a specific composition range, a specific (meth) acrylic acid copolymer is used as a water-sensitive material. It was found that the particle size of the aggregate used and the fluidity of the mortar have an extremely close relationship, and thus the present invention was completed as a self-leveling material having a performance exceeding the conventional self-leveling material. In addition, it was found that the water content of the crushed slag powder and gypsum with respect to the clean car powder derived from cement has a close relationship with the high fluid holding time, and a method of supplying it as a self-leveling phase material was completed.

In other words, the present invention is 100% by weight of blast furnace chain slag powder 25 to 60% by weight, 25 to 60% by weight cement and 10% by weight anhydrous and / or dihydrate gypsum, 15% by weight or less In addition, 0.1-0.5 weight part of (meth) acrylic-acid copolymers as a water reducing agent, 80-150 weight part of aggregates whose ratio of the largest particle diameter is 5 mm or less to 0.15 mm or less of 10 weight% or less, water 30-50 weight part, etc. It is a high fluidization mortar characterized by mixing the usual additives such as antifoaming agent, water-retaining agent. In addition, by supplying such high-molecular mortar as a self-leveling phase material, the high-molecular mortar is prepared at the factory, and is transported to the construction site by edge-tattering the edge of the high-molecular holding time to the construction site. In the construction, the high fluidity holding time is controlled by adjusting the content ratio of the blast furnace slag powder or anhydrous gypsum and / or dihydrate gypsum to the clean car powder derived from the cement of the high dynamic mortar. It is a method of supplying a high fluidization mortar as a self-leveling phase material.

The blast furnace chain slag powder content of the base material of the high liquefaction mortar of this invention is 25 to 60 weight%, Preferably it is 35 to 40 weight%. If it exceeds 60% by weight, it takes time to develop the strength of mortar, and it hinders the next work process, and if it is less than 25% by weight, it is necessary to stir with a large amount of water in order to secure fluidity, and adversely affect other physical properties. Moreover, since fluid holding time falls, it is unpreferable. The gypsum contained in the substrate is at least one kind of gypsum selected from the group consisting of anhydrous gypsum and dihydrate gypsum, and its content is 10% by weight to 15% by weight.

If it is less than 10% by weight, the dry shrinkage of the mortar becomes large and the fluid holding time becomes short, and if it exceeds 15% by weight, it is not preferable because it is easy to expand. In addition, when half-water gypsum is used as the gypsum, it is difficult to secure the pot life because the fluid holding time does not increase even when an additive such as a retardant is used. It is not preferable because it is not easy and smooth construction surface cannot be obtained.

Portland cement, various mixed cements, etc. are used as cement, The content rate is 25 to 60 weight% of a base material, Preferably it is 40 to 50 weight%. If it is less than 30% by weight, the strength expression property is slow, and if it exceeds 60% by weight, the fluidity becomes poor and the fluid holding time becomes short.

In the method of supplying the high fluidization mortar of the present invention as a self-leveling phase material, the fluid holding time is controlled by adjusting the content ratio between the clean car powder derived from cement and the blast furnace slag powder. In addition, the fluid retention time is controlled by adjusting the content ratio of kinkame and gypsum.

For reference, 100 parts by weight of clean car powder (brain specific surface area: 3200㎠ / g), blast furnace slag powder (brain specific surface area: 3800 cm 2 / g), 0 to 200 parts by weight, and 15 parts by weight of anhydrous gypsum and clean car powder The flow rate immediately after mixing and mixing the raw materials for 5 minutes with respect to the high fluidization mortar having a water content of 40 parts by weight with respect to 100 parts by weight of the total amount of crushed slag powder and gypsum, and the flow value when the mixing was continued. Table 1 shows the mixing time up to 80% of the value. 100 parts by weight of clean car powder (brain specific surface area: 3200 cm 2 / g), 100 parts by weight of hydrated slag powder (brain specific surface area: 3800 cm 2 / g) and 4 to 30 parts by weight of anhydrous gypsum and clean car powder, hydrated slag Table 2 shows the results for 100 parts by weight of high flow mortar with a total water content of 40 parts by weight of powder and gypsum.

Flow is a value measured after 3 minutes of the diameter of the material spread in a circular shape on a glass horizontal plate after filling the pipe vertically with a material of 5 cm in diameter and 10 cm high. .

As a water reducing agent to be used for the high liquefaction mortar of the present invention, a general formula

(However, R ¹ represents hydrogen or a methyl group, R ² represents an alkylene group having 2 to 4 carbon atoms, R ³ represents hydrogen or an alkylene group having 1 to 5 carbon atoms, and P represents an integer of 1 to 100) The structural unit (a) derived from the polyalkylene glycol mono (meth) acrylic acid ester monomer shown by

(Wherein R ⁴ represents hydrogen or methyl group, X represents hydrogen, monovalent metal, divalent metal, ammonium group or organic amine) There exists a meth) acrylic acid type copolymer, For example, the thing of Unexamined-Japanese-Patent No. 59-18338 is known. Moreover, a small amount of the structural unit (C) derived from the monomer copolymerizable with these monomers can be contained. As for the ratio of each structural unit, (A) is 10-95 weight%, (B) is 90-5 weight%, and (C) is 0-50 weight%, More preferably, (A) 50-80 weight% And (b) are 20 to 50% by weight.

Examples of the polyalkylene glycol mono (meth) acrylic acid ester monomer for inducing structural unit (A) include polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, and polybutylene glycol monomer (meth). Acrylate, methoxy polyethylene glycol mono (meth) acrylate, methoxy polypropylene glycol (meth) acrylate, methoxy polybutylene glycol mono (meth) acrylate, ethoxy polybutylene glycol mono (meth) acrylate , Ethoxy polybutylene glycol mono (meth) acrylate, and the like, and one kind or two or more kinds thereof can be used.

Examples of the (meth) acrylic acid monomers for deriving the structural unit (b) include acrylic acid, methacrylic acid, and monovalent metal salts, divalent metal salts, ammonium names and organic amine salts thereof. The above can be used.

As a monomer copolymerizable with a polyalkylene glycol mono (meth) acrylic acid ester monomer for inducing a structural unit (b) and a (meth) acrylic acid monomer for inducing a structural unit (b), an aliphatic alcohol having 1 to 20 carbon atoms Polyalkylene having an added mole number of 2 to 100 esters of esters with (meth) acrylic acid, (meth) acrylamide, maleic acid, fumaric acid or their acids and aliphatic alcohols having 10 to 20 carbon atoms or 2 to 4 carbon atoms or their glycols Aromatic vinyl, vinyl chloride, such as monoester or diester, vinyl acetate, vinyl acetate, propenyl acetate, styrene, p-methylstyrene, styrene sulfonic acid, etc., with glycol, These one kind or two kinds are mentioned. The above can be used.

The content rate of this water reducing agent is 0.1-0.5 weight part with respect to 100 weight part of base materials. If it is less than 0.1 part by weight, the fluidity of the mortar is rapidly worsened, and if it is more than 0.5 part by weight, the strength expression of the mortar is inhibited, which is not preferable. Moreover, when the other water reducing agent is used instead of the water reducing agent, since the fluidity | liquidity of mortar falls in a short time, it is unpreferable. As the aggregate, there are river sand, sea sand, silica sand, limestone, fly ash, silica material, and the like. In the present invention, the maximum particle size is 5 mm or less, preferably 2.5 mm or less, and the ratio of the particle size 0.15 mm or less is used. 10 wt% or less, preferably 5 wt% or less. More preferably, 1.5 mm sieve residue is 10% by weight or less, particularly 5% by weight or less of aggregate. If the maximum particle size exceeds 5 mm, the finished skin is bad, and if the particle size is 0.15 mm or less, if the ratio exceeds 10% by weight, the fluidity of the mortar decreases rapidly, which is not preferable. The content rate of aggregate is 80-150 weight part with respect to 100 weight part of base materials, Preferably it is 85-100 weight part.

If the content of the aggregate is less than 80 parts by weight, the cracking resistance of the mortar falls, and if it exceeds 150 parts by weight, the flowability of the mortar rapidly decreases, which is not preferable. As water for mixing, a constant can be used, and the usage-amount is 30-50 weight part with respect to 100 weight part of base materials. If the amount is less than 30 parts by weight, the fluidity of the mortar is lowered. If it is more than 50 parts by weight, the physical properties such as the decrease in the strength developability of the mortar and the increase in the dry shrinkage are deteriorated and material separation is not preferable.

The mortar of this invention may mix | blend normal additives, such as an antifoamer and a water retention agent.

However, in the case of the expansion agent usually added to improve the mortar cracking resistance, the mortar of the present invention has an effect of improving long-term dry shrinkage, although the hardening shrinkage of the cement component is not obtained, so that it does not obtain long-term dry shrinkage reduction effect. It is not known, and conversely, since the risk of abnormal expansion increases, it is not used.

As a defoaming agent, a fururonic compound, polyoxyethylene alkyl phenol ether, etc. are used, The content rate is 0.005-0.2 weight part is preferable with respect to 100 weight part of base materials.

As a water-retaining agent, a cellulose thing, a vinyl thing, an acryl thing, etc. are used, The content rate is 0.05-2 weight part with respect to 100 weight part of base materials. In addition, a hardening regulator, a viscosity regulator, a cryoprotectant, etc. can also be added suitably.

Example 1

For mortar made of a mixture of portland cement, blast furnace crushed slag powder, anhydrous gypsum, 2.0mm no sieving powder, 1.5mm sieving powder 3.5% by weight, 0.15 sieve fraction 0.8% by weight of silica sand and (meth) acrylic acid copolymer Table 3 shows the compounding amounts and mortar performance of each raw material. However, each mortar contains 0.2 weight part of plutonic antifoamers and 0.15 weight part of methylcellulose repair agents with respect to 100 weight part of base materials.

In addition, the expanding agent used in the comparative example is a CSA-based expanding agent. Again, the flow was measured according to the Housing Urban Maintenance Corporation standard. Compressive strength was tested in accordance with JIS-R-5201, and air-cured specimen under the condition of temperature 20 ℃, and dry shrinkage was tested in accordance with JIS-A-1129, under temperature 20 ℃ and 65% humidity. Measured against. Regarding abnormal expansion, according to JIS-A-1129, the expansion ratio is measured for the specimens sealed and cured, and it is said that the expansion is abnormal when the expansion ratio is + 0.05% or more. The cracking generation age was formed by lining a 2mm thick lining with a mortar to be tested on the outer periphery of a steel pipe with an outer diameter of 12cm, a length of 30cm, and a thickness of 3mm, and visually examining the specimen obtained by air-curing at a temperature of 20 ° C and a humidity of 65%. Observation was made by judging.

Example 2

Usually 47 parts by weight of Portland cement, 40 parts by weight of blast furnace slag powder, 13 parts by weight of anhydrous gypsum, no residue of 2.0 mm sieve, 1.5 parts of sieve residue, 90 parts by weight of 3.5% by weight of silica sand, 0.25 weight of (meth) acrylic acid copolymer Table 4 shows the flow values immediately after the 0.15 mm sieve passage fraction of the silica sand used was mixed with the ratio with respect to the mortar formed by mixing 39 parts by weight of water, 0.2 part by weight of a fururonic antifoaming agent and 0.15 part by weight of a methylcellulose-based water-retaining agent.

Example 3

Normally 47 parts by weight of Portland cement, 40 parts by weight of blast furnace slag powder, 13 parts by weight of anhydrous gypsum, no residue of 2.0 mm sieves, 3.5 parts by weight of 90 parts by weight of silica sand of 3.5% by weight, 0.8% by weight of 0.15 mm sieve. Table 5 shows the types, amounts and flow values of the water reducing agent with respect to the mortar formed by mixing various water reducing agents 0.25 to 0.9 parts by weight, water 39 parts by weight, 0.2 parts by weight of a fururonic antifoaming agent, and 0.15 parts by weight of a methylcellulose-based repair agent.

Example 4

Usually 47 parts by weight of Portland cement, 40 parts by weight of blast furnace slag powder, 13 parts by weight of anhydrous gypsum or hemihydrate gypsum, no 2.0 mm sieve residue, 1.5 weight of sieve residue 3.5 weight%, 0.15 mm sieve 0.8 weight% silica sand 90 weight Table 6 shows the types and flow values of the gypsum used for the mortar formed by mixing 0.25 parts by weight of the (meth) acrylic acid copolymer, 39 parts by weight of water, 0.2 parts by weight of a fururonic antifoaming agent, and 0.15 parts by weight of a methylcellulose-based repair agent. .

The high fluidization mortar of the present invention has the following advantages as compared to the conventionally known self-leveling material.

(1) The pot life is remarkably long because of high fluidity over long time.

(2) Since there is very little dry shrinkage, cracking resistance is remarkably high.

(3) Since high fluidity can be obtained in a small amount, the strength after curing is large.

In addition, since the high fluidity holding time can be controlled in accordance with the transportation time and the construction time when transporting to the construction site by edge data as a self-leveling phase material, the self-leveling phase material can be prepared in the factory. Transportation by a data car is possible, and it can construct efficiently with this.

Claims (2)

Substrate consisting of 25 to 60% by weight of blast furnace chain slag powder, 25 to 60% by weight of cement and anhydrous gypsum, dihydrate gypsum or a mixture of anhydrous gypsum and dihydrate gypsum 10% by weight to 15% by weight I) 0.1 to 0.5 parts by weight of a (meth) acrylic acid copolymer, 100 to 5 parts by weight, a maximum particle diameter of 5 mm or less, and an aggregate of 80 to 150 parts by weight of aggregate having a particle diameter of 0.15 mm or less, 10% by weight or less, water 30 to 50 High fluidization mortar, characterized in that the mixture by weight and ordinary additives. A method of supplying a high fluidization mortar according to claim 1 as a self-leveling phase material, wherein a high fluidity mortar is prepared at a factory, and is transported to a construction site while edge-tagging by an agitator within the high fluidization holding time. In the case of construction as a leveling phase material, it is intrinsic by adjusting the content ratio of the blast furnace slag powder or the anhydrous gypsum, the dihydrate gypsum or the mixture of the anhydrous gypsum and the dihydrate gypsum with respect to the clean car powder derived from the cement of the high liquefaction mortar. A method for supplying a high lubrication mortar as a self-leveling phase material characterized by controlling the dynamic holding time.