Concrete manufacturing method

Abstract

To provide a construction position clear indication method of a concrete placing joint treatment agent which can clearly indicate a sprayed part.SOLUTION: A method for clearly indicating a construction position where a placing joint treatment agent (setting retarder) is constructed in concrete placing joint treatment makes a component contained in a placing joint treatment agent constructed to the concrete react with concrete at a construction position (sprayed part), changes appearance of the construction position to a form that is visually distinguishable from a non-construction position and thereby clearly indicates the construction position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for indicating the application position of a concrete joint treatment agent. [Background technology]

[0002] Conventionally, when constructing concrete structures, joint treatment is carried out (see, for example, Patent Document 1). If joint treatment is not carried out properly, it can become a structural weakness and affect durability. A typical joint treatment involves spraying a set retarder on the joint where bleeding has subsided, and then carrying out a laitance treatment the following day. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-256804 Summary of the Invention [Problem to be solved by the invention]

[0004] However, it is necessary to spray retarder reliably at joints, but it is difficult to tell where spraying has been completed, so there is a risk that some areas will remain unsprayed. Also, if retarder is accidentally sprayed on a part of the structure that is not a joint, there is a risk of damaging the surface of the structure. For this reason, there was a need for a technology that can clearly indicate where spraying has been completed.

[0005] The present invention has been made in consideration of the above, and aims to provide a method for indicating the application position of a concrete joint treatment agent, which can clearly indicate the areas where the agent has been sprayed. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the objectives, the method for indicating the application position of a concrete joint treatment agent according to the present invention is a method for indicating the application position where a joint treatment agent has been applied during concrete joint treatment, and is characterized in that the application position is indicated by the components contained in the joint treatment agent applied to the concrete reacting with the concrete at the application position, changing the appearance of the application position to a form that is visually distinguishable from non-application positions.

[0007] Another method for indicating the application location of a concrete joint treatment agent according to the present invention is characterized in that, in the above-mentioned invention, the components contained in the applied joint treatment agent change color or foam when they react with components in the concrete at the application location.

[0008] Another method for indicating the application position of a concrete joint treatment agent according to the present invention is a method for indicating the application position where a joint treatment agent has been applied during concrete joint treatment, and is characterized in that a sprayer is used to form foam of the joint treatment agent and spray this foam onto the application position, making the sprayed position visible so as to indicate the application position.

[0009] Another method for indicating the application position of a concrete joint treatment agent according to the present invention is characterized in that, in the above-mentioned invention, the joint treatment agent is a thickening retarder composed of compound A having a setting retarding effect and compound B which is one or more alkali-thickening type thickeners whose aqueous solution viscosity increases in an alkaline environment.

[0010] Another method for indicating the application position of a concrete joint treatment agent according to the present invention is characterized in that, in the above-mentioned invention, the compound A is composed of one or more of oxycarboxylic acid, lignosulfonic acid, phosphonic acid, humic acid and / or salts thereof, or sugars and polyols.

[0011] Another method for indicating the application position of a concrete joint treatment agent according to the present invention is characterized in that, in the above-mentioned invention, compound B is an acrylic thickener and is composed of one or more thickeners whose aqueous solution viscosity at 5% active ingredient is 10 mPa·s or less at pH=5 and 200 mPa·s or more at pH=12.

[0012] Another method for indicating the application position of a concrete joint treatment agent according to the present invention is characterized in that, in the above-mentioned invention, the composition of the compound A and the compound B is 10 / 90 to 60 / 40 in weight ratio.

[0013] Another method for indicating the application position of a concrete joint treatment agent according to the present invention is the same as the above-mentioned method, except that the surface area of ​​the concrete is 1 m 2 It is characterized by being used by spraying 150ml to 1500ml per unit. [Effects of the Invention]

[0014] According to the method for indicating the application position of a concrete joint treatment agent of the present invention, the method is a method for indicating the application position where a joint treatment agent has been applied during concrete joint treatment, in which the components contained in the joint treatment agent applied to the concrete react with the concrete at the application position, changing the appearance of the application position to a form that is visually distinguishable from non-application positions, thereby indicating the application position, thereby achieving the effect of being able to indicate the application position by changing the appearance of the application position.

[0015] In addition, according to another method of indicating the application position of a concrete joint treatment agent of the present invention, when the components contained in the applied joint treatment agent react with the components in the concrete at the application position, they discolor or foam, thereby achieving the effect of making it possible to indicate the application position by the discoloration or foaming at the application position.

[0016] In addition, another method of indicating the application position of a concrete joint treatment agent according to the present invention is a method of indicating the application position where a joint treatment agent has been applied during concrete joint treatment, in which a sprayer is used to form bubbles of the joint treatment agent and then spray this foam onto the application position, making the sprayed position visible and thereby indicating the application position, thereby achieving the effect of being able to indicate the application position by changing the appearance of the application position.

[0017] Furthermore, according to another method of indicating the application position of a concrete joint treatment agent of the present invention, the joint treatment agent is a thickening retarder composed of compound A having a setting retarding effect and compound B which is one or more alkali thickening type thickeners whose aqueous solution viscosity increases in an alkaline environment, and therefore has the effect of being able to indicate the application position by a change in the appearance of the application position.

[0018] Furthermore, according to another method of indicating the application position of a concrete joint treatment agent of the present invention, the compound A is composed of one or more of oxycarboxylic acid, lignosulfonic acid, phosphonic acid, humic acid and / or salts thereof, or sugars and polyols, and therefore, the application position can be indicated by a change in the appearance of the application position.

[0019] Furthermore, according to another method of the present invention for indicating the application position of a concrete joint treatment agent, compound B is an acrylic thickener, and is composed of one or more thickeners whose aqueous solution viscosity at 5% active ingredient is 10 mPa·s or less at pH=5 and 200 mPa·s or more at pH=12, thereby achieving the effect of making it possible to indicate the application position by changing the appearance of the application position.

[0020] Furthermore, according to another method for indicating the application position of a concrete joint treatment agent of the present invention, the composition of the compound A and the compound B is 10 / 90 to 60 / 40 in weight ratio, and therefore, an effect is achieved in that the application position can be indicated by a change in the appearance of the application position.

[0021] In addition, according to another method for indicating the application position of a concrete joint treatment agent according to the present invention, the surface area of ​​the concrete is 1 m 2 Since 150ml to 1500ml is sprayed per application, the application location can be clearly identified by the change in appearance of the application location. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic flow chart showing an embodiment of a method for indicating the application position of a concrete joint treatment agent according to the present invention. [Figure 2] FIG. 2 is a diagram showing an example of the locations where the setting retarder is sprayed. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the method for indicating the application position of a concrete joint treatment agent according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to this embodiment.

[0024] 1, in the method for indicating the application position of a concrete joint treatment agent according to this embodiment, first, a set retarder (joint treatment agent) is sprayed (applied) onto concrete (Step S1). Then, components contained in the set retarder react with the concrete at the sprayed location (application location), changing the appearance of the sprayed location to a state that is visually distinguishable from the non-sprayed location (non-application location), thereby indicating the sprayed location (Step S2).

[0025] The set retarder of this embodiment already contains a component for indicating the sprayed area. For example, this component may be a component that chemically reacts with alkali components or moisture in the concrete to change color. This color change changes the appearance of the sprayed area so that it is visually distinguishable from non-sprayed areas. In this way, the sprayed area and non-sprayed area can be clearly indicated. Instead of or in addition to the component that chemically reacts with alkali components or moisture in the concrete to change color, the set retarder may contain a component that chemically reacts with alkali components or moisture in the concrete to foam. Alternatively, a color pigment different in color from the color of the concrete may be used instead of the above-mentioned component.

[0026] Figure 2(1) shows an example where retarder has been sprayed onto the top surface 2 of the concrete wall of a concrete structure 1. Figure 2(2) shows an example where retarder has been sprayed onto the top surface 3 of the concrete of a square pillar of the concrete structure 1. As shown in these figures, the sprayed areas (top surfaces 2, 3) have reacted with the concrete and changed in appearance, making them visually distinguishable from the surrounding areas of the concrete structure 1 where retarder has not been sprayed.

[0027] According to this embodiment, the sprayed area can be clearly indicated by a change in the appearance of the sprayed area. Therefore, it is possible to confirm that the sprayed area is exactly sprayed only on the desired joint treatment surface at the joint treatment site. Reliable joint treatment is possible without damaging the concrete structure. Another advantage is that workers and staff can visually check the progress of the retarder spraying work.

[0028] In addition, since the sprayed area can be clearly visualized, if the spray is accidentally sprayed in an unintended location, it can be wiped off immediately to prevent damage to the surface of the concrete structure.

[0029] (Set retarder composition) Next, an embodiment of the setting retarder composition will be described. In a first embodiment, the present invention provides a retarder composition for cement-based building materials, said composition comprising, in each case relative to the total weight of the composition: a) 3 to 13 wt % of at least one retarder selected from the group consisting of sugar acids, sugars, sugar alcohols, hydroxycarboxylic acids, lignosulfonic acids, phosphoric acids, phosphonic acids, boric acids, and salts thereof; b) 10-20 wt % of at least one thickener selected from alkali-swellable polymers, and c) The remainder is water.

[0030] A set retarder in the context of the present invention is a chemical substance or mixture of chemical substances that slows the hydration of cementitious building materials after the addition of mixing water compared to when such a set retarder is not added. In particular, set retarders affect the hydration reaction at an early age and reduce the increase in compressive strength.

[0031] The at least one retarder is present in the composition of the present invention in an amount of 3 to 13 wt %, preferably 5 to 10 wt %, particularly preferably 8 wt %, based on the total weight of the composition. According to an embodiment, the at least one retarder is selected from the group consisting of sugar acids, sugars, sugar alcohols, hydroxycarboxylic acids, lignosulfonic acids, phosphoric acids, phosphonic acids, boric acids and salts thereof.

[0032] In the present invention, sugar acids are monosaccharides having a carboxyl group, such as aldonic acid, urosonic acid, uronic acid, or aldaric acid. Aldonic acid is preferred. Examples of sugar acids useful in the present invention include, but are not limited to, glyceric acid, xylonic acid, gluconic acid, ascorbic acid, neuraminic acid, glucuronic acid, galacturonic acid, iduronic acid, tartaric acid, mucic acid, and saccharinic acid. Sugar acids may exist as free acids or as salts. In some embodiments, sugar acid salts are salts with metals from Groups IIa, IIa, IIb, IIb, IVb, and VIIIb of the Periodic Table of the Elements. Preferred sugar acid salts are salts of alkali and alkaline earth metals, iron, cobalt, copper, or zinc. Particularly preferred are salts of monovalent metals such as lithium, sodium, and potassium.

[0033] The sugar in the present invention is a carbohydrate having an aldehyde group. In a particularly preferred embodiment, the sugar belongs to the group of monosaccharides or disaccharides. Examples of sugars include, but are not limited to, glyceraldehyde, threose, erythrose, xylose, lyxose, arabinose, ribose, allose, altrose, glucose, mannose, gulose, idose, galactose, talose, fructose, sorbose, lactose, maltose, sucrose, lactulose, trehalose, cellobiose, chitobiose, isomaltose, palatinose, mannobiose, raffinose and xylobiose.

[0034] The sugar alcohol in the present invention is a polyhydric alcohol that can be derived from sugar through oxidation-reduction reaction.Therefore, sugar alcohol belongs to the class of alditol.Examples of sugar alcohols include, but are not limited to, ethylene glycol, glycerol, diglycerol, threitol, erythritol, pentaerythritol, dipentaerythritol, xylitol, ribitol, arabitol, sorbitol, sorbitan, isosorbide, mannitol, dulcitol, fucitol, iditol, inositol, volemitol, lactitol, maltitol, isomalt, maltotriitol, maltotetriitol, and polyglycitol.

[0035] In the present invention, a hydroxycarboxylic acid is a carboxylic acid containing an OH-moiety in the same molecule. Examples of hydroxycarboxylic acids include, but are not limited to, malic acid, citric acid, isocitric acid, tartaric acid, tartronic acid, mandelic acid, salicylic acid, lactic acid, tannic acid, and humic acid. Preferred hydroxycarboxylic acids are citric acid, tartaric acid, and lactic acid. Hydroxycarboxylic acids exist as free acids or salts. According to an embodiment, the salt of a hydroxycarboxylic acid is a salt with ammonium or a metal from group IIa, IIa, IIb, IIb, IVb, or VIIIb of the periodic table of the elements. Preferred salts of hydroxycarboxylic acids are alkali metal salts, alkaline earth metal salts, or ammonium salts.

[0036] The phosphoric acid of the present invention is a derivative of phosphoric acid. The phosphoric acid may be free phosphoric acid, a phosphoric acid oligomer, and / or a phosphoric acid polymer, such as diphosphate, triphosphate, or tetraphosphate. The phosphoric acid may be protonated, partially deprotonated, or fully deprotonated. Fluorinated phosphoric acid is also possible. Examples of suitable phosphoric acids are trisodium orthophosphate, tetrasodium pyrophosphate, sodium hexametaphosphate, and disodium fluorophosphate. The phosphoric acid may refer to an ester of phosphoric acid or an ester of one of its oligomers. Examples of phosphoric acid esters include, but are not limited to, mixed esters with the above-mentioned hydroxycarboxylic acids and / or sugar acids, mixed esters with carboxylic acids, especially mixed esters with fatty acids, alkyl esters, aryl esters, and esters with polyalkylene glycols.

[0037] The phosphonic acid may be mono-, di-, tri-, tetra-, penta-, or hexa-phosphonic acid, as well as their oligomers and / or esters. Preferably, the phosphonic acid has an organic functional group. The phosphonate may exist in a protonated, partially deprotonated, or fully deprotonated state. Examples of suitable phosphonic acids are 1-hydroxyethylidene-1,1-diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, 3-aminopropylphosphonic acid, aminotri(methylenephosphonic acid), and diethylenetriaminoepenta(methylenephosphonic acid).

[0038] The preferred borate salts in the present invention are salts of boric acid, boric acid or borax.

[0039] Sodium gluconate as the at least one set retarder is a particularly preferred embodiment.

[0040] The at least one thickening agent is selected from alkali-swellable polymers.

[0041] It is also possible to use mixtures of different alkali-swellable polymers.The at least one thickener is present in the composition according to the invention in an amount of from 10 to 20 wt.%, preferably from 12 to 17 wt.%, relative to the total weight of the composition.

[0042] According to a preferred embodiment, at least one thickener is an alkali-swellable polymer, preferably an alkali-swellable polymer emulsion. The alkali-swellable polymer is a carboxylic acid-functional copolymer that can be produced by free-radical emulsion polymerization of ethylenically unsaturated monomers. The alkali-swellable polymer is a preferential copolymer of (meth)acrylic acid and an ester of (meth)acrylic acid. The copolymer of (meth)acrylic acid and an ester of (meth)acrylic acid may contain additional monomer units such as propylene, butadiene, styrene, vinyl chloride, vinyl alcohol, and / or an ester of vinyl alcohol, such as vinyl acetate. The most preferred copolymer in the present invention is a copolymer of methacrylic acid and an ester of acrylic acid, particularly a copolymer of methacrylic acid and an ethylene ester of acrylic acid in a molar ratio of about 1:1. The copolymer is an anionic-charged polymer. Generally, the alkali-swellable polymer has a high molecular weight, such as a number average molecular weight Mn of 10,000 to 10,000,000 g / mol, preferably 10,000 to 1,000,000 g / mol, and particularly preferably 30,000 to 500,000.

[0043] The glass transition temperature (Tg) of the alkali-swellable polymer is not particularly limited and can vary over a wide range. The Tg of the alkali-swellable polymer, measured according to ASTM D3418, is within the range of -20°C to +90°C. The alkali-swellable polymer thickens upon absorption of water and swelling, and the thickening occurs depending on the pH change from low to high. At low pH, the copolymer is insoluble in water, but becomes neutralized and soluble at high pH, ​​resulting in thickening. Mixtures of two or more alkali-swellable polymers are also possible.

[0044] Particularly preferred alkali-swellable polymers are aqueous emulsions, also known as ASE (alkali-soluble / swellable polymer emulsions). Preferred ASEs have a solids content of 10 to 40 wt%, particularly 25 to 35 wt%. The alkali-swellable polymer emulsions of the present invention exhibit effective thickening at pH >5, more preferably pH >7, and particularly pH >8.

[0045] Alkali-swellable polymers can also be hydrophobically modified. This is typically done by incorporating a small number of hydrophobic macromonomers into the polymer. Such macromonomers are esters of (meth)acrylic acid and hydrophobic alcohols, styrene derivatives, or nonionic surfactants. The molecular weight of the hydrophobically modified alkali-swellable polymer is typically lower than that of the ASE polymers mentioned above. Hydrophobically modified alkali-swellable polymers are preferentially used as aqueous emulsions, also known as HASE (hydrophobically modified alkali-soluble polymer emulsions).

[0046] Suitable ASEs and HASEs are available under the brand names Acrysol from Dow Chemical, Acryset from Nippon Shokubai, or Rheovis from BASF.

[0047] Pigments can be used to add color to the set retarder composition of the present invention. This is useful for identifying the location where the set retarder composition has already been applied during application. Suitable pigments are organic or inorganic pigments. Organic dyes can also be used. Suitable pigments are known to those skilled in the art. In one embodiment, titanium dioxide (TiO2) is used as the pigment. In another embodiment, an azo pigment is used as the pigment. In yet another embodiment, fluorescein, rhodamine, or a derivative thereof is used as the pigment. Pigments can be used in the set retarder formulation of the present invention in an amount of 1 wt% or less, based on the total weight of the set retarder composition.

[0048] In a second embodiment, the present invention relates to a retarder composition for cement-based building materials, said composition comprising: a) 3 to 13 wt% of at least one cement hydrating agent selected from the group consisting of sugar acids, sugars, sugar alcohols, hydroxycarboxylic acids, lignosulfonic acids, phosphates, phosphonic acids, borates, and salts thereof; b) 10-20 wt % of at least one thickener selected from the group consisting of alkali-swellable polymers; c) optionally 20 to 90 wt. %, preferably 50 to 90 wt. %, in particular 67 to 87 wt. % of at least one filler, d) 0-1 wt% pigment; e) Composed of 0 to 1 wt% preservative and the remainder water.

[0049] In a third embodiment, the present invention relates to a method for producing a washed finish concrete, comprising the steps of: a) contacting a surface of an unhardened cementitious building material with a set retarder composition as described above; b) allowing the cementitious building material to harden while the surface is in contact with the set retarder composition; and c) removing the set retarder composition and residual material from the concrete surface.

[0050] In the above embodiment, the case of a set retarder as the joint treatment agent has been described as an example, but the present invention is not limited to this, and other joint treatment agents such as a set accelerator may also be used. In this case, the same effects as those described above can be achieved.

[0051] In the above embodiment, a sprayer may be used to form foam of the joint treatment agent and spray this foam onto the application location, making the sprayed location visually recognizable, thereby indicating the application location. In this way, the application location can also be indicated by a change in the appearance of the application location.

[0052] The joint treatment agent may also be a thickening retarder composed of compound A having a setting retarding effect and compound B which is one or more alkali thickening type thickeners whose aqueous solution viscosity increases in an alkaline environment.

[0053] Compound A may be composed of one or more of hydroxycarboxylic acid, lignosulfonic acid, phosphonic acid, humic acid and / or their salts, or sugars and polyols. Compound B may be an acrylic thickener, and may be composed of one or more thickeners whose aqueous solution viscosity at 5% active ingredient is 10 mPa·s or less at pH=5 and 200 mPa·s or more at pH=12. The weight ratio of Compound A and Compound B may be, for example, 10 / 90 to 60 / 40. As a joint treatment agent, for example, 2 A spray of 150ml to 1500ml per spray may be used.

[0054] As described above, the method for indicating the application position of a concrete joint treatment agent according to the present invention is a method for indicating the application position where a joint treatment agent has been applied during concrete joint processing, in which the components contained in the joint treatment agent applied to the concrete react with the concrete at the application position, changing the appearance of the application position into a form that is visually distinguishable from non-application positions, thereby indicating the application position, and the application position can be indicated by the change in appearance of the application position.

[0055] Furthermore, according to another method of indicating the application position of a concrete joint treatment agent of the present invention, when the components contained in the applied joint treatment agent react with the components in the concrete at the application position, the agent discolors or foams, and the application position can be indicated by the discoloration or foaming at the application position.

[0056] In addition, according to another method of indicating the application position of a concrete joint treatment agent of the present invention, this is a method of indicating the application position where a joint treatment agent has been applied during concrete joint treatment, in which a sprayer is used to form foam of the joint treatment agent and then spray this foam onto the application position, making the sprayed position visible and thereby indicating the application position, so that the application position can be indicated by a change in the appearance of the application position.

[0057] Furthermore, according to another method of indicating the application position of a concrete joint treatment agent of the present invention, the joint treatment agent is a thickening retarder composed of compound A having a setting retarding effect and compound B which is one or more alkali thickening type thickeners whose aqueous solution viscosity increases in an alkaline environment, so that the application position can be indicated by a change in the appearance of the application position.

[0058] Furthermore, according to another method of indicating the application position of a concrete joint treatment agent of the present invention, the compound A is composed of one or more of oxycarboxylic acid, lignosulfonic acid, phosphonic acid, humic acid and / or salts thereof, or sugars and polyols, so that the application position can be indicated by a change in the appearance of the application position.

[0059] In addition, according to another method of indicating the application position of a concrete joint treatment agent of the present invention, compound B is an acrylic thickener, and is composed of one or more thickeners whose aqueous solution viscosity at 5% active ingredient is 10 mPa·s or less at pH=5 and 200 mPa·s or more at pH=12, so that the application position can be indicated by a change in the appearance of the application position.

[0060] Furthermore, according to another method for indicating the application position of a concrete joint treatment agent of the present invention, the composition of the compound A and the compound B is 10 / 90 to 60 / 40 in weight ratio, so that the application position can be indicated by a change in the appearance of the application position.

[0061] In addition, according to another method for indicating the application position of a concrete joint treatment agent according to the present invention, the surface area of ​​the concrete is 1 m2 It is used by spraying 150ml to 1500ml per area, so the application location can be clearly identified by the change in appearance of the application area. [Industrial Applicability]

[0062] As described above, the method for indicating the application position of a concrete joint treatment agent according to the present invention is useful for concrete joint treatment, and is particularly suitable for indicating locations where a joint treatment agent such as a setting retarder has been sprayed. [Explanation of symbols]

[0063] 1. Concrete structure 2,3 Concrete surface

Claims

[Claim 1] 1. A method for producing washed finish concrete, comprising: A method for producing concrete, comprising the steps of: bringing a surface of an unhardened cementitious building material into contact with a thickening retarder composed of compound A having a set retarding effect and compound B which is one or more alkali-swellable polymer emulsions containing a nonionic surfactant, the aqueous solution viscosity of which increases in an alkaline environment; hardening the cementitious building material while the surface of the cementitious building material is in contact with the set retarder; and thereafter, removing the set retarder and any residual materials from the surface of the cementitious building material.

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