JP2003055024A - Cement composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cement composition nearly free from the fear of its unnecessary flow-out far away, having an underwater inseparable property, nearly free from the fear that a back filling material is leaked out from a crack lying at lining concrete of a tunnel, excellent in strength development and the like and used when the viscosity of cement concrete is needed to be suddenly increased. SOLUTION: The cement composition contains cement slag, alkali thickened polymer emulsion, especially alkali thickened polymer emulsion obtained by copolymerization of unsaturated carboxylic acids and an ethylenic unsaturated compound, a hardening promoter and clay and/or a foaming agent.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cement composition used in the field of civil engineering / construction, and particularly to rapidly increase the viscosity of cement concrete such as a backfill material for cavities and voids in the ground and a filler for shield segments. The present invention relates to a cement composition used for an application that needs to be elevated. In the present invention, cement paste, mortar, and concrete are collectively referred to as cement concrete. Further, the term "part" or "%" as used in the present invention is based on mass unless otherwise specified.

[0002]

[Prior art and its problem] In the lining of a tunnel, a cavity may be generated on the back surface of the tunnel during or after construction.
At that time, it is necessary to fill the cavity with a backfill material to stabilize the tunnel. Conventionally, cement bentonite has been used as a backfill material, but its fluidity is so great that it may unnecessarily escape to a distant place, and if there is spring water, the backfill material may flow out. There were some problems such as the backfill material leaking from cracks generated in the lining concrete of the tunnel, and the strength development was poor.

In order to cope with these problems, a method of increasing the viscosity by adding a super absorbent resin and a method of adding water glass to accelerate the curing have been proposed (Japanese Patent Laid-Open No. 10-2).
37446, JP-A-11-061123). However, each of the methods has problems that it takes time for the viscosity to rise, the super absorbent polymer is expensive, and the pH value is as high as 13 or more.

As a result of various studies to solve the above problems, the present inventor has completed the present invention by finding that the above problems can be solved by using a specific cement composition.

[0005]

Means for Solving the Problems That is, the present invention is a cement composition containing cement, slag, and an alkali-thickening polymer emulsion, wherein the alkali-thickening polymer emulsion contains unsaturated carboxylic acids and ethylenic The cement composition, which is a polymer emulsion obtained by copolymerizing a saturated compound, includes a curing accelerator, clay,
And / or the cement composition containing a foaming agent.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

The cement used in the present invention is not particularly limited, and ordinary cement can be used,
Specifically, normal, early strength, ultra early strength, moderate heat, low heat, and various portland cements such as sulfate resistant, various mixed cements obtained by mixing silica or fly ash with these various portland cements, fine particle cement , And ultrafine particle cement. The amount of cement used is preferably 5 to 90 parts, more preferably 20 to 60 parts, based on 100 parts of the total amount of cement and slag. If it is less than 5 parts, the strength development may deteriorate, and if it exceeds 90 parts, the amount of alkali eluted from the cement may increase and the pH value may increase.

Examples of the slag used in the present invention include blast furnace slag produced as a by-product from a blast furnace and steelmaking slag produced as a by-product from a converter, an electric furnace and the like. Among these, from the viewpoint of strength development. Blast furnace slag is preferable, and amorphous blast furnace slag is more preferable. The particle size of the slag, Blaine specific surface area value (hereinafter, referred to as Blaine value) is preferably at least 3,000 cm ² / g, the more preferably at least ^{6,000cm 2 / g, 9,000cm 2 /} g or more is most preferred. If it is less than 3,000 cm ² / g, strength development may be reduced. The amount of slag used is preferably 10 to 95 parts, and more preferably 40 to 80 parts, out of 100 parts of cement and slag. If it is less than 10 parts, the amount of alkali eluted from the cement may be large and the pH value may be high, and if it exceeds 95 parts, the strength development property may be deteriorated.

The alkali-thickening type polymer emulsion (hereinafter referred to as the present emulsion) used in the present invention means a polymer emulsion thickened by alkali. Various emulsions can be used as the present emulsion, but a polymer emulsion obtained by copolymerizing an unsaturated carboxylic acid and an ethylenically unsaturated compound is preferable from the viewpoint of instantly showing a thickening effect when combined with cement. Polymerization methods for polymer emulsions include unsaturated carboxylic acids and ethylenically unsaturated compounds, emulsion polymerization, suspension polymerization, solution polymerization,
Alternatively, a method of copolymerizing by a method such as bulk polymerization may be used.

Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid, aconitic acid, and unsaturated carboxylic acids such as crotonic acid, maleic anhydride and citraconic anhydride. Unsaturated carboxylic acid anhydrides and unsaturated carvone half-esters such as monomethyl itaconate, monobutyl itaconate, and monoethyl maleate can be mentioned. Among them, unsaturated carboxylic acid is preferable in terms of exhibiting superior effects. Acids are preferred, and acrylic acid and / or methacrylic acid are more preferred.

Examples of the ethylenically unsaturated compound include ethylene, cyanovinyl monomers such as acrylonitrile and methacrylonitrile, methyl acrylate, ethyl acrylate, butyl acrylate, hexyl acrylate,
Cyclohexyl acrylate, octyl acrylate,
Acrylic ester monomers such as hydroxyethyl acrylate, 2-ethylhexyl acrylate, and glycidyl acrylate, methacrylic acid ester monomers such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, hydroxyethyl methacrylate, and glycidyl methacrylate, vinyl formate, vinyl acetate, propionic acid Vinyl, vinyl butyrate, vinyl caproate, vinyl caprylate, vinyl laurate, vinyl stearate, vinyl octylate, and C3-18 aliphatic carboxylic acid vinyl esters such as vinyl neodecanoate, methyl vinyl ether, ethyl vinyl ether,
Vinyl ether monomers such as butyl vinyl ether and phenyl vinyl ether, amide monomers such as acrylamide and methacrylamide, maleimide, N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide, N-phenylmaleimide, and N-toluylmaleimide. Maleimide monomers, halogenated olefin monomers such as vinyl chloride and vinylidene chloride, N-vinylpyrrolidone, ethylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, propylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol di Methacrylate, ethylene glycol diacrylate, polyethylene glycol diacrylate, triallyl cyanurate, isocyanurate Examples thereof include polyfunctional vinyl monomers such as triallyl acid chloride, trimethylolpropane trimethacrylate, allyl acrylate, and allyl methacrylate. Among these, acrylic ester monomer and / or methacrylic acid monomer are used in view of more excellent effects. Acid ester monomers are preferred.

In this emulsion, the copolymerization ratio (mass ratio) of the unsaturated carboxylic acids and the ethylenically unsaturated compound is such that the unsaturated carboxylic acids: ethylenically unsaturated compound is 20: 1. ~ 1: 20 is preferable, 5: 1 ~
1: 5 is more preferable. The amount of this emulsion used is 0.0 in terms of solid content based on 100 parts of cement and slag.
1 to 10 parts is preferable, and 0.1 to 5 parts is more preferable. If it is less than 0.01 part, the thickening effect is reduced and the fluidity is increased,
The inseparability in water may deteriorate, and if it exceeds 10 parts, the initial strength development may deteriorate. This emulsion is preferably diluted with water for use because it produces a uniform backfill cement composition. The concentration of the present emulsion aqueous solution varies depending on the present emulsion to be used and is not particularly limited, but usually 0.1 to 1 in terms of solid content.
It is preferably used as a 0% aqueous solution.

Further, in the present invention, it is preferable to use a curing accelerator in order to obtain a stronger thickening property. By obtaining a strong thickening property, when used as a filler, it is possible to improve the effect of preventing escape and the effect of preventing dilution with water. The curing accelerator used in the present invention, lithium aluminate, sodium aluminate, potassium aluminate, and aluminate such as calcium aluminate,
Sulfates such as lithium sulfate, sodium sulfate, magnesium sulfate, potassium sulfate, potassium alum, calcium sulfate, aluminum sulfate and iron sulfate, carbonates such as lithium carbonate, sodium carbonate and potassium carbonate, lithium hydroxide, sodium hydroxide , Hydroxides such as magnesium hydroxide, aluminum hydroxide, potassium hydroxide and calcium hydroxide, chlorides such as calcium chloride, magnesium chloride and iron chloride, lithium silicate, sodium silicate and potassium silicate Silicates, amines such as diethanolamine and triethanolamine,
Examples thereof include calcium salts of organic acids such as calcium formate and calcium acetate, and colloids such as silica sol and alumina sol. One kind or a combination of two or more kinds thereof can be used. Among these, aluminates and / or sulfates are preferable, and those in which aluminates and sulfates are used in combination are more preferable, from the viewpoints of excellent strength development and reduction of the amount of alkali eluted from cement.

Among the aluminates, calcium aluminate is preferred because it has the highest strength development and can reduce the amount of alkali eluted from cement. Calcium aluminate is a mixture of a raw material containing calcia and a raw material containing alumina, etc., obtained by heat treatment such as firing in a kiln or melting in an electric furnace, CaO and Al ₂ O ₃ As a main component, it is a general term for substances having hydration activity, and CaO and / or a part of Al ₂ O ₃ is an alkali metal oxide, an alkaline earth metal oxide, silicon oxide, titanium oxide, iron oxide, alkali. Metal halide, alkaline earth metal halide,
A substance in which an alkali metal sulfate, an alkaline earth metal sulfate, or the like is substituted, or a substance containing CaO and Al ₂ O ₃ as main components, and these are solid-dissolved, is a substance. The mineral form may be crystalline or amorphous.
Among these, amorphous calcium aluminate is preferable from the viewpoint of reaction activity, and amorphous calcium aluminate obtained by rapidly cooling a heat-treated product corresponding to the composition of 12CaO · 7Al ₂ O ₃ is more preferable. The particle size of the calcium aluminate is preferably 3,000 cm ² / g or more in Blaine value, 5,000 cm ² / g or more is more preferable. If it is less than 3,000 cm ² / g, the initial strength development may decrease.

As the sulfate, calcium sulfate and / or aluminum sulfate is preferable from the viewpoint of strength development. Examples of calcium sulfate include anhydrous gypsum, hemihydrate gypsum, and gypsum dihydrate. Among them, anhydrous gypsum is preferable from the viewpoint of strength development. The particle size of the sulfate is preferably from 3,000 cm ² / g or more in Blaine value, 5,000 cm ² / g or more is more preferable. If it is less than 3,000 cm ² / g, strength development may be reduced.

When an aluminate and a sulfate are used together as a curing accelerator, the amount of the sulfate used is preferably 20 to 500 parts, more preferably 50 to 150 parts, based on 100 parts of the aluminate. If it is less than 20 parts, the strength developability may decrease, and if it exceeds 500 parts, the fluidity may increase, the inseparability in water may deteriorate, and the long-term strength developability may decrease.

The amount of the curing accelerator used is preferably 0.5 to 60 parts, and more preferably 1 to 20 parts, based on 100 parts of the total amount of cement and slag. If it is less than 0.5 parts, the fluidity will increase,
The inseparability in water may be poor, the strength development may be low, the amount of alkali eluted from the cement may be large, and the pH value may be high. If it exceeds 60 parts, the long-term strength development may be low.

Further, it is preferable to use clay in the present invention. As the clay, swelling clay that absorbs water and increases its volume is preferable. Examples of the swelling clay include bentonite, acid clay, diatomaceous earth, and activated clay obtained by acid-treating acid clay.In these, the degree of swelling increases, the viscosity increases rapidly, and the inseparability in water is increased. Bentonite is preferable from the viewpoint of superiority. The amount of clay used cannot be limited because it varies depending on the type and quality of clay, the order in which cement, slag, clay, and water are mixed, but in general, it is 5 for every 100 parts of cement and slag.
~ 500 parts are preferred, and 30-200 parts are more preferred. If it is less than 5 parts, the inseparability in water may be deteriorated, and if it exceeds 500 parts, the strength development may be decreased.

Further, it is preferable to use a foaming agent in the present invention. Examples of the foaming agent include surfactants, animal proteins, resin soaps, aluminum metal powders, and the like. Among these, surfactants are preferable because they are effective even when added in a small amount.

Examples of the surface active agent include anionic surface active agents, cationic surface active agents, amphoteric surface active agents, and nonionic surface active agents.

Examples of the anionic surfactant include soaps such as sodium laurate, sodium stearate, and sodium oleate, higher alcohol sulfate ester salts such as sodium polyoxyethylene lauryl ether sulfate, and higher alkyl ether sulfate ester salts. ,
Sulfated oils, sulfated fatty acid esters, sulfated fatty acids, sulfated salts such as sulfated olefins, sulfonates such as alkylbenzene sulfonates, alkylnaphthalene sulfonates, and paraffin sulfonates,
In addition, phosphoric acid esters such as higher alcohol phosphoric acid esters may be mentioned. Examples of the cationic surfactant include amine salt type cationic surfactants such as higher alkylamine salts, and quaternary ammonium salt type cationic surfactants such as alkyltrimethylammonium salts and alkyldimethylbenzylammonium salts. Examples of the amphoteric surfactant include amino acid type amphoteric surfactants, betaine type amphoteric surfactants such as stearyl dimeryl betaine and lauryl dihydroxyethyl betaine. Examples of the nonionic surfactant include polyethylene glycol type nonionic surfactants and polyhydric alcohol type nonionic surfactants. Among these, excellent foaming properties,
Anionic surfactants are preferable, higher alcohol sulfate ester salts are more preferable, and sodium polyoxyethylene lauryl ether sulfate is most preferable, from the viewpoints of stable air bubbles and high fluidity.

The amount of the foaming agent used is not particularly limited, but generally 0.01 to 5 parts is preferable, and 0.1 to 1 part is more preferable, relative to 100 parts of the total amount of cement and slag. If it is less than 0.01 part, bubbles formed may become unstable and fluidity may be reduced, and if it exceeds 5 parts, inseparability in water may be deteriorated and strength development may be reduced.
The soluble foaming agent can be used as an aqueous solution. In this case, the concentration of the aqueous foaming agent solution varies depending on the foaming agent used and is not particularly limited, but generally 1 to 10% is preferable.

In the present invention, the cement composition of the present invention comprises
It is also possible to use an aggregate such as sand or gravel, an AE agent, a water reducing agent, a high-performance water reducing agent, a shrinkage reducing agent, a rust preventive agent, a waterproofing agent, a swelling agent, and an antifreezing agent in combination.

The amount of water used is not particularly limited, but is 30 to 500 relative to 100 parts of cement and slag in total.
Parts are preferable, and 50 to 300 parts are more preferable. If it is less than 30 parts, it may be difficult to knead the cement composition.
If it exceeds the part, the fluidity may increase and the inseparability in water may deteriorate.

The cement composition of the present invention is obtained by mixing cement, slag, and the present emulsion,
Further, if necessary, it is possible to mix a curing accelerator, clay, and a foaming agent. The method for mixing the cement composition is not particularly limited, but cement, slag,
When an alkali-thickening type polymer emulsion, hardening accelerator, clay, and foaming agent are used in combination, clay and water are mixed beforehand to swell the clay, and then cement and slag are mixed. Then, a cement slurry is prepared, and air bubbles are generated by mixing an aqueous solution of a foaming agent and compressed air to prepare an air mortar, and then a hardening accelerator and this emulsion are mixed to rapidly increase the viscosity. There is a method of making it.

It is preferable that the curing accelerator is mixed with water in advance to form a solution or suspension, in order to obtain a uniform viscous substance in a small amount. When a hardening accelerator consisting of aluminate alone or a combination of aluminate and sulfate is made into a solution or suspension, hardening may occur within 1 hour after mixing with water. It is preferable to use an agent together. Examples of the curing retarder include oxycarboxylic acids such as citric acid, tartaric acid, gluconic acid, and malic acid, their oxycarboxylic acid salts, boric acid, tripolyphosphate salts, and pyrophosphate salts. You may use together 1 type, or 2 or more types of these hardening retarders. Of these, oxycarboxylic acid salts are preferable, and sodium citrate is more preferable, because of its large retarding effect. The amount of the curing retarder used is preferably 0.1 to 20 parts, and more preferably 1 to 5 parts, per 100 parts of the curing accelerator. If it is less than 0.1 part, the retarding effect may be small, and if it exceeds 20 parts, the strength development may be reduced.

As a method of merging and mixing the cement composition, a method of using a mixing tube such as a Y-shaped tube, a method of using a double tube or a triple tube, and an inlet piece for merging and mixing in a shower shape are used. Examples include the method used.
Further, a method in which a spiral mixer is set in the pipe after the confluent mixing and mixed is also included. In the present invention, cement, slag, and water, a suspension of clay if necessary, and a kneaded product of a mixture of a foaming agent and water, if necessary, a mixture of this emulsion and water, and if necessary. It is possible to use a method of using an inlet piece for merging and mixing a mixture of a curing accelerator and water in a shower shape.
In order to mix the cement composition more uniformly, it is possible to set a spiral mixer in the pipe after the confluent mixing and further mix the cement composition.

In the actual construction, cement, slag, and water, if necessary, a suspension of clay, a mixture of this emulsion and water, a mixture of a foaming agent and water, if necessary, and, if necessary, And 2 to 4 types of suspensions or aqueous solutions consisting of a mixture of a curing accelerator and water are separately pumped,
It is preferable to perform the mixing and mixing at the tip of the nozzle.

[0029]

EXAMPLES The present invention will be further described below with reference to experimental examples of the present invention, but the present invention is not limited thereto.

Experimental Example 1 A mixture was prepared by kneading 50 parts of cement, 50 parts of slag, and 150 parts of water.
An agent was prepared. On the other hand, agent B was prepared by mixing 0.5 part of the present emulsion α, 5 parts of the curing accelerator shown in Table 1 and 10 parts of water with respect to 100 parts of cement and slag in total. However, for the curing accelerators f and g, 2 parts of the curing retarder was used in combination with 100 parts of the curing accelerator. The agents A and B were continuously added to the mixer and kneaded for 30 seconds to prepare a cement composition, and its fluidity, inseparability in water, leakability from cracks, and compressive strength were measured. The results are also shown in Table 1.
For comparison, the same experiment was conducted using a non-main emulsion having no alkali thickening property in place of the present emulsion. The results are also shown in Table 1.

<Materials used> Cement: ordinary Portland cement, commercially available slag: ground blast furnace slag, amorphous, Blaine value 1
0.500 cm ² / g, commercial product Main emulsion α: Solid content concentration 30%, ethyl acrylate / methacrylic acid copolymer polymer emulsion, polymer composition is ethyl acrylate: methacrylic acid in mass ratio
45:55 Non-main emulsion: Solid content concentration 30%, styrene / 2-ethylhexyl acrylate copolymer polymer emulsion,
The polymer composition is styrene: 2-ethylhexyl acrylate in a mass ratio of 45:55 curing accelerator a: aluminum sulfate, commercial curing accelerator b: sodium carbonate, commercial curing accelerator c: calcium hydroxide, commercial curing accelerator d: Sodium aluminate, commercially available curing accelerator e: Silica sol, commercially available curing accelerator f: Calcium aluminate, rapidly cooled heat-treated product corresponding to 12CaO.7Al ₂ O ₃ composition, amorphous, Blaine value 6,000 cm ² / g Curing accelerator g: Calcium aluminate obtained by quenching a heat-treated product corresponding to the composition of 12CaO · 7Al ₂ O ₃ , amorphous, Blaine value 6,
100 g of 000 cm ² / g and 100 parts of Blaine value 5,400 cm ² / g anhydrous gypsum 100
Mixture set retarder: Sodium citrate, commercial product

<Measurement Method> Fluidity: The kneaded product was placed in a cylinder having an inner diameter of 80 mm and a height of 80 mm, and the spread after the cylinder was pulled out was measured after 2 minutes. Underwater non-separability: Conducted in accordance with the underwater separability test in the appendix of the Japan Society of Civil Engineers Design Guide for Underwater Non-separable Concrete. When there is no turbidity of water, it is good when there is slight turbidity of water, when there is turbidity of water, it is possible that the material is settled, and when the material is dispersed, the turbidity of water is great. The case was disallowed. Leakage from cracks: J1 described in JSCE-F541
4 funnels were filled with the cement composition, and the presence or absence of outflow from the funnel was evaluated. When there was no outflow at all, it was evaluated as ○, when even a slight outflow was observed, it was evaluated as Δ, and when all outflow was evaluated as ×. Compressive strength: According to JIS R 5201, the compressive strength at a predetermined material age was measured.

[0033]

[Table 1]

Experimental Example 2 A total of 100 parts of cement and slag was kneaded with 250 parts of clay and water shown in Table 2 by a mixer, and then 50 parts of cement and 50 parts of slag were kneaded to prepare an agent A. On the other hand, for a total of 100 parts of cement and slag, 5 parts of the curing accelerator and 10 parts of water shown in Table 2, and 2 parts for 100 parts of the curing accelerator.
Part of the curing retarder was mixed to prepare Part B. Furthermore, for 100 parts of cement and slag in total, 0.5
Part C of this emulsion α was mixed with 10 parts of water to prepare agent C. Agent A, agent B and agent C, or agent A and agent B were continuously added to the mixer and kneaded for 30 seconds to prepare a cement composition, and the same procedure as in Experimental Example 1 was performed. The results are shown in Table 2.
Also described in.

<Materials used> Clay: Bentonite, swelling power 24.0ml / 2g, commercial product

[0036]

[Table 2]

Experimental Example 3 60 parts of clay and 2 parts of water to 100 parts of cement and slag in total
After kneading 50 parts with a mixer, 50 parts cement and 50 slag
The parts were kneaded to prepare agent A. On the other hand, with respect to a total of 100 parts of cement and slag, 5 parts of a hardening accelerator and 10 parts of water, and 2 parts of a hardening retarder with respect to 100 parts of a hardening accelerator were mixed to prepare an agent B. Further, with respect to 100 parts in total of cement and slag, 0.5 part of the main emulsion β in terms of solid content and 10 parts of water were mixed to prepare a C agent. Then, a D agent was prepared from a 4% aqueous solution of a foaming agent containing a foaming agent shown in Table 3 and high pressure air, and was mixed with a agent A by a mixer to prepare air-containing cement milk. Into the air-containing cement milk, the agents B and C are continuously added to the mixer and kneaded for 30 seconds to prepare a cement composition, which has fluidity, inseparability in water,
The same procedure as in Experimental Example 1 was performed except that the compressive strength and the volume were measured. The results are also shown in Table 3.

<Materials used> The present emulsion β: solid content concentration 30%, ethyl acrylate / acrylic acid copolymer polymer emulsion, the polymer composition is ethyl acrylate: methacrylic acid in a mass ratio of 4
A mixture foaming agent consisting of 70 parts of 5:55 and an ethylene / vinyl acetate copolymer emulsion, and the polymer composition is 30 parts of an ethylene: vinyl acetate mass ratio of 18:82.
: Anionic surfactant, sodium polyoxyethylene lauryl ether sulfate, commercial product

<Measurement Method> Weight: Calculated by putting the prepared cement composition in a 500 cc container and dividing the mass by the volume.

[0040]

[Table 3]

Experimental Example 4 60 parts of clay and 250 parts of water were kneaded to 100 parts of cement and slag in the amounts shown in Table 4 to prepare agent A, and the total of cement and slag was prepared. The same procedure as in Experimental Example 3 was performed except that 4 parts of the aqueous foaming agent solution containing 0.5 part of the foaming agent was mixed with 100 parts of high pressure air to prepare the D agent. The results are also shown in Table 4.

[0042]

[Table 4]

[0043]

EFFECTS OF THE INVENTION By using the cement composition of the present invention, the cement concrete using the cement composition exhibits a sharp increase in viscosity, so that when it is used as a backfill material, it may unnecessarily escape to a long distance. There are effects such as a small amount, an inseparability in water, a risk that the backfill material leaks from cracks existing in the lining concrete of the tunnel, and an excellent strength development property.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C04B 24:26 C04B 22:08 Z 22:08 22:14 A 22:14 22:06 A 22:06 Z 22:10 22:10 24:16 24:16 14:10 14:10) 111: 70 111: 70 F term (reference) 2D055 JA00 KA08 KA09 LA14 4G012 PA04 PA06 PA29 PB02 PB05 PB06 PB08 PB09 PB10 PB11 PB16 PB17 PB20 PB21 PB24 PB27 PB28 PB30 PB31 PB32 PB33 PB36

Claims (5)

[Claims] 1. A cement composition comprising cement, slag, and an alkali thickening polymer emulsion. 2. The cement composition according to claim 1, wherein the alkali-thickening polymer emulsion is a polymer emulsion obtained by copolymerizing an unsaturated carboxylic acid and an ethylenically unsaturated compound. 3. The cement composition according to claim 1, further comprising a hardening accelerator. 4. The method according to claim 1, further comprising clay.
The cement composition according to item 1 of item 3. 5. The method according to claim 1, further comprising a foaming agent.
4. The cement composition according to claim 1.