Calcium aluminosilicate-based compound, quick hardening material, quick hardening mortar material, quick hardening concrete material, method for shaping hardened mortar body, and method for shaping hardened concrete body

Abstract

The purpose of the present invention is to provide a calcium aluminosilicate-based compound that, when added to cement or the like, has high compressive strength and is capable of imparting a favorable surface finish. This calcium aluminosilicate-based compound contains, as chemical components, 30-60 mass% of CaO, 10-60 mass% of Al2O3, 1-15 mass% of SiO2, 10-50,000 ppm of P2O5 by mass ratio, and 0.1-1 mass% of MgO.

Description

Calcium aluminosilicate compound, rapid hardening agent, rapid hardening mortar material, rapid hardening concrete material, method for forming hardened mortar body, and method for forming hardened concrete body

[0001] The present invention relates to a calcium aluminosilicate compound for accelerating the hardening of hydraulic substances such as cement, a hardening accelerator, and a rapid-hardening mortar material, a rapid-hardening concrete material, a method for forming a hardened mortar body, and a method for forming a hardened concrete body, all of which use the same.

[0002] Calcium aluminate, gypsum, and the like are used as quick hardening agents to impart rapid hardening properties to hydraulic substances such as cement, thereby allowing them to harden and develop strength in a short period of time.

[0003] For example, Patent Document 1 below describes a cement admixture containing calcium aluminate and gypsum. The cement admixture of Patent Document 1 has high strength development and can suppress cracking.

[0004] JP 2023-49713 A

[0005] However, rapid-hardening cement containing a rapid-hardening agent tends to deteriorate the surface quality of the driving surface, and even if the driving surface is finished with a trowel, spots, irregularities, etc. tend to appear on the surface as it hardens, and the surface finish after hardening may not be good. Even with the cement admixture described in Patent Document 1, no consideration was given to surface finish.

[0006] The present invention has been made in view of the above circumstances, and aims to provide a calcium aluminosilicate compound which, when added to cement or the like, can impart high initial compressive strength and good surface finish, a hardening agent, and a rapid-hardening mortar material, a rapid-hardening concrete material, a method for molding a hardened mortar body, and a method for molding a hardened concrete body, each containing the hardening agent.

[0007] As a result of intensive research conducted by the present inventors to solve the above problems, it was found that the chemical components of the alloy are CaO, Al ２ O ３ , SiO ２ , P ２ O ５The present inventors have found that the above-mentioned problems can be solved by using a calcium aluminosilicate compound containing MgO in a predetermined proportion, and have arrived at the present invention.

[0008] [1] Chemical components include 30% by mass or more and 60% by mass or less of CaO and Al ２ O ３ 10% by mass or more and 60% by mass or less of SiO ２ 1% by mass or more and 15% by mass or less, ２ O ５ [2] A calcium aluminosilicate compound containing 10 ppm or more and 50,000 ppm or less of Fe, and 0.1 mass % or more and 1 mass % or less of MgO as chemical components. ２ O ３ [3] The calcium aluminosilicate compound according to [1], containing, as a chemical component, ZrO in a mass ratio of 0.1 mass % to 3 mass %. ２The calcium aluminosilicate compound according to [1] or [2], containing 100 ppm to 5,000 ppm of gypsum. [4] A hardening accelerator containing 50 parts by mass to 250 parts by mass of gypsum per 100 parts by mass of the calcium aluminosilicate compound according to any one of [1] to [3]. [5] The hardening accelerator according to [4], containing 20% ​​by mass to 30% by mass of sulfur (S) in terms of oxide. [6] The hardening accelerator according to [4] or [5], containing 300 ppm to 40,000 ppm by mass of fluorine. [7] The hardening accelerator according to any one of [4] to [6], having an ignition loss of 0.1% by mass to 3% by mass before and after heat treatment from room temperature to 950°C. [8] A hardening mortar material containing cement, the hardening accelerator according to any one of [4] to [7], and fine aggregate. [9] A rapid-hardening concrete material containing cement, the rapid-hardening admixture according to any one of [4] to [7], fine aggregate, and coarse aggregate.

[10] A method for forming a hardened mortar body, comprising mixing cement, the rapid-hardening admixture according to any one of [4] to [7], water, and aggregate to produce a rapid-hardening mortar composition, layering the rapid-hardening mortar composition, and hardening the rapid-hardening mortar composition to produce a hardened mortar body.

[11] A method for forming a hardened concrete body, comprising mixing cement, the rapid-hardening admixture according to any one of [4] to [7], water, fine aggregate, and coarse aggregate to produce a rapid-hardening concrete composition, layering the rapid-hardening concrete composition, and hardening the rapid-hardening concrete composition to produce a hardened concrete body.

[0009] According to the present invention, it is possible to provide a calcium aluminosilicate compound which, when added to cement or the like, has high initial compressive strength and can impart a good surface finish, a hardening agent, a rapid-hardening mortar material containing the hardening agent, a rapid-hardening concrete material, a method for molding a hardened mortar body, and a method for molding a hardened concrete body.

[0010] The calcium aluminosilicate compound, the rapid hardening agent, the rapid hardening mortar material, the rapid hardening concrete material, the method for forming a hardened mortar body, and the method for forming a hardened concrete body of the present invention will be described in detail below, but the present invention is not limited to these embodiments. Furthermore, a numerical range defined using the symbol "to" is intended to include the numerical values ​​at both ends (upper and lower limits) of "to".

[0011] [Calcium aluminosilicate compound] The calcium aluminosilicate compound of the present invention contains, as chemical components, CaO in an amount of 30% by mass to 60% by mass, Al ２ O ３ 10% by mass or more and 60% by mass or less of SiO ２ 1% by mass or more and 15% by mass or less, ２ O ５ and MgO in an amount of 0.1 mass % or more and 1 mass % or less.

[0012] As a chemical component, the content of CaO is preferably 35% by mass or more and 55% by mass or less, and more preferably 40% by mass or more and 50% by mass or less. ２ O ３ is preferably 20% by mass or more and 50% by mass or less, and more preferably 25% by mass or more and 45% by mass or less. ２ is preferably 2% by mass or more and 14% by mass or less, and more preferably 3% by mass or more and 13% by mass or less. ２ O ５ The content of MgO is preferably 0.2 mass % or more and 0.9 mass % or less and more preferably 0.3 mass % or more and 0.8 mass % or less.

[0013] CaO, Al ２ O ３ , SiO ２ , P ２ O ５By setting the content of , and MgO within the above ranges, a calcium aluminosilicate compound can be obtained that can form a rapid-hardening mortar having high initial compressive strength and good surface finish.

[0014] The calcium aluminosilicate compound according to this embodiment can be obtained by, for example, blending and mixing a calcium-containing raw material, an aluminum-containing raw material, and a silicon-containing raw material as main raw materials, and further blending phosphorus- and magnesium-containing raw materials to a desired composition, and then melting and cooling the blended raw materials in an electric furnace. Alternatively, the compound can be obtained by firing the blended and mixed raw materials in a kiln. Examples of calcium-containing raw materials include quicklime, limestone, and slaked lime. Examples of aluminum-containing raw materials include bauxite and aluminum ash. Examples of silicon-containing raw materials include silica stone. Examples of phosphorus-containing raw materials include calcium phosphate. Examples of magnesium-containing raw materials include magnesium oxide and magnesium hydroxide.

[0015] The calcium aluminosilicate compound according to this embodiment contains the above-mentioned CaO, Al ２ O ３ , SiO ２ , P ２ O ５ and may contain components other than MgO, ２ O ３ and ZrO ２ It is preferable that the alloy contains one or both of the following chemical components: Fe ２ O ３ When the calcium aluminosilicate compound contains ZrO, the content of the ZrO in the calcium aluminosilicate compound is preferably 0.1% by mass or more and 3% by mass or less, more preferably 0.2% by mass or more and 2.5% by mass or less, and even more preferably 0.3% by mass or more and 2% by mass or less. ２ When the calcium aluminosilicate compound contains the hydroxybenzoate, the content thereof in the calcium aluminosilicate compound is preferably 100 ppm or more and 5000 ppm or less, more preferably 200 ppm or more and 4000 ppm or less, and even more preferably 300 ppm or more and 3000 ppm or less, by mass.

[0016] The above Fe ２ O ３ and / or ZrO ２ By including the compound, it is possible to achieve a balance between the hardening acceleration ability and the strength development ability.

[0017] In addition, as a component derived from the above raw materials, TiO ２ , MnO, Na ２ O.K. ２ Although it may contain oxygen and the like, this is not a problem as long as it does not impair the effects of the present invention.

[0018] The calcium aluminosilicate compound according to this embodiment has a Blaine specific surface area of ​​4000 cm ２ / g or more 9000cm ２ / g or less, and ２ / g or more 8000cm ２ The Blaine specific surface area of ​​calcium aluminosilicate can be measured based on JIS R5201 (physical testing method for cement).

[0019] The calcium aluminosilicate compound according to this embodiment may be either crystalline or amorphous, but amorphous compounds are preferred because they harden in a short time and subsequently exhibit high early strength development. The vitrification rate of the calcium aluminosilicate compound is preferably 90% or higher, and more preferably 95% or higher. By setting the vitrification rate to 90% or higher, it is possible to produce hardened mortar and hardened concrete that exhibit high strength development in a short time, i.e., high early strength development. The vitrification rate of the calcium aluminosilicate compound can be adjusted by adjusting the heating / melting temperature and the cooling method.

[0020] The vitrification rate of a calcium aluminosilicate compound can be determined by powder X-ray diffraction / Rietveld analysis. That is, a calcium aluminosilicate compound is heated and cooled to crystallize it, and powder X-ray diffraction measurement is performed on the crystallized calcium aluminosilicate compound. The main peak area S ０Furthermore, the calcium aluminosilicate compound before heating is subjected to powder X-ray diffraction measurement, and the main peak area S is determined using quantitative software. The main peak area S of this crystallized calcium aluminosilicate compound is ０ The vitrification rate can be calculated from the ratio of the main peak area S of the calcium aluminosilicate compound before heating to the area S of the main peak of the calcium aluminosilicate compound before heating. A predetermined amount of an internal standard substance such as aluminum oxide or magnesium oxide is added to the sample, and the mixture is thoroughly mixed in an agate mortar or the like, followed by powder X-ray diffraction measurement. The measurement results can be analyzed using quantitative software to determine the amount of mineral composition produced, with the remainder being the vitrification rate of the sample. The quantitative software that can be used is, for example, "SIROQUANT" manufactured by Sietronics.

[0021] [Hardening Accelerator] The hardening accelerator of the present invention contains 50 parts by mass or more and 250 parts by mass or less of gypsum per 100 parts by mass of the calcium aluminosilicate compound of the present invention described above.

[0022] (Gypsum) Examples of gypsum used in the present invention include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum. Examples also include natural gypsum, by-product gypsum, and gypsum obtained by heat treating these. Among these, anhydrous gypsum is preferred because of its high strength development. Furthermore, the inclusion of a trace amount of fluorine in the hardening accelerator can increase the fluidity of the cement composition, making it easier to ensure initial handleability, so it is preferable to use by-product gypsum made of fluorine-containing anhydrous gypsum. The fluorine content in the hardening accelerator is preferably 300 ppm to 40,000 ppm by mass, more preferably 1,000 ppm to 35,000 ppm, and even more preferably 2,000 ppm to 30,000 ppm.

[0023] The content of gypsum in the hardening accelerator is 50 parts by mass or more and 250 parts by mass or less, preferably 60 parts by mass or more and 200 parts by mass or less, and more preferably 70 parts by mass or more and 150 parts by mass or less, relative to 100 parts by mass of the calcium aluminosilicate compound. By setting the gypsum content to 50 parts by mass or more and 250 parts by mass or less, it is possible to increase the initial compressive strength of the hardened mortar and hardened concrete bodies to which the hardening accelerator has been added and to improve the surface finish.

[0024] In addition, S (sulfur) is contained in the rapid hardening material, and SO ３ The rapid hardening material preferably contains 20% by mass or more and 30% by mass or less, more preferably 22% by mass or more and 29% by mass or less, and even more preferably 24% by mass or more and 28% by mass or less, in terms of oxide. ３ By containing 20% ​​by mass or more and 30% by mass or less of the rapid hardening agent, the initial compressive strength of the rapid hardening mortar to which the rapid hardening agent has been added can be increased, and the surface finish can be improved.

[0025] Furthermore, the ignition loss of the hardening agent before and after heat treatment from room temperature to 950°C is preferably 0.1% by mass to 3% by mass, more preferably 0.2% by mass to 0.9% by mass, and even more preferably 0.3% by mass to 0.8% by mass. By setting the ignition loss within the above range, fluidity can be easily ensured and a good surface finish can be achieved. The ignition loss can be adjusted to the above range by controlling the temperature and the proportion of the grinding aid when grinding the calcium aluminate compound or gypsum. Examples of grinding aids that can be used include ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, and glycerin. The ignition loss can be measured using a method similar to the apparent ignition method described in JIS R 5204 and can be determined from the mass before and after ignition at 950°C.

[0026] The hardening accelerator of this embodiment may contain components other than the calcium aluminosilicate compound and gypsum, such as a water reducing agent, an antifoaming agent, a setting modifier, cryolite, silica fume, fly ash, coal ash, blast furnace slag, a colorant, a foaming agent, an alkali metal salt, an alkaline earth metal salt, an alkali metal hydroxide, or an alkaline earth hydroxide.

[0027] [Rapid-hardening mortar material and rapid-hardening concrete material] The rapid-hardening mortar material of the present invention contains cement, the aforementioned rapid-hardening additive of the present invention, and fine aggregate. The rapid-hardening concrete material of the present invention also contains cement, the aforementioned rapid-hardening additive of the present invention, fine aggregate, and coarse aggregate. In this specification, a mixture of cement, rapid-hardening additive, and fine aggregate is referred to as a rapid-hardening mortar material, a rapid-hardening mortar composition is referred to as a rapid-hardening mortar material, and a hardened rapid-hardening mortar composition is referred to as a hardened mortar body. A mixture of cement, rapid-hardening additive, fine aggregate, and coarse aggregate is referred to as a rapid-hardening concrete material, a rapid-hardening concrete composition is referred to as a rapid-hardening concrete material, and a hardened rapid-hardening concrete composition is referred to as a hardened concrete body.

[0028] (Accelerator) The accelerator used in this embodiment is the same as that described above. The content of the accelerator is preferably 5 parts by mass or more and 50 parts by mass or less, more preferably 5 parts by mass or more and 40 parts by mass or less, and even more preferably 10 parts by mass or more and 30 parts by mass or less, relative to 100 parts by mass of cement in the rapid-hardening mortar material or the rapid-hardening concrete material. When the content ratio of the accelerator is within the above range, it is possible to improve the early strength development and to impart a good surface finish.

[0029] (Cement) The cement used in this embodiment is not particularly limited, and examples include various Portland cements such as ordinary, early-strength, extra-early-strength, low-heat, and medium-heat; various blended cements obtained by mixing these Portland cements with blast furnace slag, fly ash, silica fume, etc.; environmentally friendly cements (ecocements) produced using municipal waste incineration ash or sewage sludge incineration ash as raw materials; commercially available fine particle cements; and white cements. Various cements can also be finely powdered and used. Furthermore, cements prepared by increasing or decreasing the amount of components (e.g., gypsum) typically used in cements can also be used. Furthermore, combinations of two or more of these cements can also be used. In this embodiment, ordinary Portland cement or early-strength Portland cement is preferably selected from the viewpoint of achieving high initial compressive strength and a good surface finish.

[0030] The cement used in this embodiment has a Blaine specific surface area of ​​2,500 cm from the viewpoint of production cost and strength development. ２ / g or more 7,000cm ２ / g or less, and ２ / g or more 6,000cm ２ / g or less, and more preferably 3,000 cm ２ / g or more 4,500cm ２ In the present invention, the Blaine specific surface area value is determined in accordance with JIS R 5201:2015 (physical testing methods for cement).

[0031] The cement content in the rapid-hardening mortar material or the rapid-hardening concrete material is preferably 5% by mass or more and 70% by mass or less, and more preferably 10% by mass or more and 60% by mass or less, from the viewpoint of achieving high initial compressive strength development and imparting good surface finish.

[0032] (Fine Aggregate) The fine aggregate used in the present invention may be the same as that used in ordinary cement mortar or concrete. That is, river sand, mountain sand, crushed sand, lime sand, silica sand, colored sand, sea sand, etc. may be used, and combinations of these may also be used.

[0033] (Coarse Aggregate) The coarse aggregate used in the present invention may be the same as that used in ordinary concrete, such as river gravel, mountain gravel, crushed stone, limestone aggregate, artificial aggregate, blast furnace slag aggregate, sea gravel, artificial lightweight aggregate, and heavy aggregate, and these may also be combined.

[0034] The content of fine aggregate in the rapid hardening mortar material is preferably 40 to 250 parts by mass, more preferably 50 to 230 parts by mass, and even more preferably 60 to 200 parts by mass, relative to 100 parts by mass of cement. By keeping the content of fine aggregate within the above range, it is possible to improve the early strength development and to impart a good surface finish.

[0035] Furthermore, the content of fine aggregate and coarse aggregate in the rapid-hardening concrete material is preferably 40 to 800 parts by mass, more preferably 50 to 750 parts by mass, and even more preferably 60 to 700 parts by mass, per 100 parts by mass of cement. By keeping the content of fine aggregate and coarse aggregate within the above ranges, it is possible to improve the early strength development and to impart a good surface finish.

[0036] A set adjuster may also be used for the rapid-hardening mortar material or rapid-hardening concrete material. The set adjuster may be any agent that delays the setting of the rapid-hardening mortar composition. For example, one or more agents selected from the group consisting of citric acid, gluconic acid, tartaric acid, malic acid, or their salts; boric acid, borates such as sodium borate; phosphates; inorganic salts such as alkali metal carbonates and alkali metal bicarbonates; and sugars may be used. Among these, one or more agents selected from the group consisting of citric acid, citrates, tartaric acid, tartrates, and alkali metal carbonates are preferred in terms of adjusting the setting time and developing early strength.

[0037] The amount of the set regulator used is preferably 0.1 to 4 parts by mass, more preferably 0.2 to 3 parts by mass, and even more preferably 0.3 to 2 parts by mass, per 100 parts by mass of the rapid-hardening mortar material or rapid-hardening concrete material. By using the set regulator in the above range, the initial compressive strength development can be improved.

[0038] In this embodiment, one or more of the following may be used to the extent that they do not adversely affect performance: siliceous fine powder, antifoaming agents, gas foaming substances, water reducing agents, air-entraining agents, rust inhibitors, water repellents, antibacterial agents, colorants, antifreeze agents, admixtures such as limestone fine powder, slowly cooled blast furnace slag fine powder, sewage sludge incineration ash and its molten slag, municipal waste incineration ash and its molten slag, and pulp sludge incineration ash; thickeners; shrinkage reducing agents; polymers; clay minerals such as bentonite and sepiolite; and anion exchangers such as hydrotalcite.

[0039] The amount of mixing water used in the rapid hardening mortar composition or rapid hardening concrete composition of this embodiment is not particularly limited, as it varies depending on the purpose and application of use and the content ratio of each material, but is preferably 10 to 70 parts by mass, more preferably 14 to 65 parts by mass, and even more preferably 16 to 60 parts by mass, per 100 parts by mass of the rapid hardening mortar material or rapid hardening concrete composition. By keeping the amount of mixing water within the above range, strength development can be improved and a good surface finish can be achieved.

[0040] Methods for mixing the materials to produce a rapid-hardening mortar composition or a rapid-hardening concrete composition include, but are not limited to, a method of adding the materials to a container such as a pail and mixing them with a hand mixer, a method of mixing using a mixer, or a method of hand-mixing. Application methods using the produced rapid-hardening mortar composition or rapid-hardening concrete composition include a method of pouring the rapid-hardening mortar composition or rapid-hardening concrete composition into the application site, a method of filling the rapid-hardening mortar composition or rapid-hardening concrete composition with a pump, a method of spraying the rapid-hardening mortar composition or rapid-hardening concrete composition with compressed air, and a method of applying it with a plastering trowel. Another example is a method of using an additive manufacturing device such as a 3D printer to layer the rapid-hardening mortar composition or rapid-hardening concrete composition, and then hardening the layered rapid-hardening mortar composition or rapid-hardening concrete composition to produce a hardened mortar or concrete body, and then forming a shaped object such as a building or structure.

[0041] The present invention will be explained in more detail below by way of examples, but the present invention is not limited to these examples.

[0042] <Measurement and Evaluation Methods> The chemical composition, vitrification rate, ignition loss of the rapid hardening agent, compressive strength of the hardened mortar and concrete, and surface finish of the calcium aluminosilicate compounds produced in each experimental example were measured and evaluated by the following methods. Chemical composition of calcium aluminosilicate compounds: Measured by X-ray fluorescence analysis. Fe ２ O ３ , MgO, P ２ O ５ , ZrO ２ Composition of trace components such as: Measured in accordance with the method described in JIS R 5202:2010. Vitrification ratio: A calcium aluminosilicate compound was heated at 1000°C for 2 hours, then slowly cooled at a cooling rate of 5°C / min, and subjected to powder X-ray diffraction measurement to identify the main peak. The main peak area S ０ From the main peak area S obtained by powder X-ray diffraction measurement of the calcium aluminosilicate compound before heating, x (mass %) = 100 × (1 − S / S０ The vitrification rate x was calculated using the formula: ) The quantitative software used was "SIROQUANT" manufactured by Sietronics, etc. Ignition loss: In accordance with JIS R 5204 "Fluorescent X-ray analysis method for cement", the apparent ignition loss was measured when ignited from room temperature to 950°C. Compressive strength (hardened mortar): In accordance with JIS R 5201 "Physical testing method for cement", the compressive strength after 6 hours of age was measured. When the compressive strength was 25 N / mm ２ Compressive strength (hardened concrete): Compressive strength after 6 hours was measured in accordance with JIS A 1108 "Test method for compressive strength of concrete." ２ Surface finish (hardened mortar): A hardened mortar measuring 4 cm x 4 cm x 16 cm was prepared, and the presence or absence of white spots (spots) on both side surfaces after one day of age was visually confirmed. In this evaluation, the area covered with spots was 85 cm or more. ２ / 128cm ２ The above x 43 cm ２ / 128cm ２ Over 85cm ２ / 128cm ２ Less than △, 43cm ２ / 128cm ２ The following were evaluated as "○". A rating of "○" was evaluated as passing. Surface finish (hardened concrete): A concrete composition was filled into a 10 cm x 10 cm x 40 cm formwork to produce a hardened concrete body, and the presence or absence of white spots (spots) on both side surfaces after one day of age was visually confirmed. In this evaluation, the area covered with spots was 267 cm ２ / 400cm ２ The above x 133 cm ２ / 400cm ２ Over 267cm ２ / 400cm ２ Less than △, 133cm ２ / 400cm ２ The following were rated as ○. Items rated as "○" were considered to be passing.

[0043] (Experimental Example 1) [Production of hardening agent] A raw material mixture was prepared by blending and mixing calcium carbonate, aluminum oxide, silicon dioxide, iron oxide, magnesium oxide, calcium phosphate, and zirconium oxide to obtain the prescribed blending ratios shown in Table 2. The raw material mixture was melted at a heating temperature of 1,600°C for 30 minutes using a high-frequency furnace, and then rapidly cooled to synthesize a calcium aluminosilicate compound. The vitrification rate was adjusted by changing the rapid cooling conditions. The synthesized calcium aluminosilicate compound was pulverized to obtain a powder with a Blaine specific surface area of ​​6,000 cm. ２ / g. The calcium aluminosilicate compound after the adjustment was mixed with gypsum in a 1:1 ratio to produce a hardening accelerator. The S content in the hardening accelerator was measured in accordance with the method described in JIS R 5202:2010. The fluorine content was measured by ion chromatography, and the S content was calculated as an oxide (SO ３ ) and the fluorine content was 1500 ppm.

[0044] (Materials used) Calcium carbonate: Reagent Aluminum oxide: Reagent Silicon dioxide: Reagent Iron oxide: Reagent Magnesium oxide: Reagent Calcium phosphate: Reagent Zirconium oxide: Reagent Gypsum: Type II anhydrous gypsum, pH 3.0, Blaine specific surface area 5000 cm ２ / g (composition is shown in Table 1)

[0045]

[0046] [Production of hardened mortar] 270 g of an accelerated hardening agent, 630 g of ordinary Portland cement, 9 g of a setting adjuster, 1,350 g of fine aggregate, and 306 g of water were mixed at room temperature (20°C) to prepare a mortar composition, which was then hardened to produce a hardened mortar. The results are shown in Table 2. (Materials used) Cement: Commercially available ordinary Portland cement (manufactured by Taiheiyo Cement Corporation, density 3.15 g / cm ３ ) Setting adjuster: A mixture of 75 parts by mass of potassium carbonate (reagent) and 25 parts by mass of citric acid (reagent) Fine aggregate: JIS standard sand Water: Tap water

[0047]

[0048] As shown in Table 2, CaO, Al ２ O ３ , SiO ２ , MgO, P ２ O ５ Test Nos. 1-2, 1-8, 1-9, 1-11, 1-14, and 1-15, which are within the scope of the present invention, exhibited high compressive strength and good surface finish. Test Nos. 1-1, 1-3 to 1-7, 1-10, 1-13, and 1-16 were those containing CaO, Al ２ O ３ , SiO ２ , MgO, P ２ O ５ Any of the above was outside the scope of the present invention, and the compressive strength was low and the surface finish was also poor.

[0049] (Experimental Example 2) A hardened mortar was produced in the same manner as in Experimental Example 1, except that a calcium aluminosilicate compound was synthesized by blending and mixing the materials in the prescribed blending ratios shown in Table 3. The results are shown in Table 3.

[0050]

[0051] (Experimental Example 3) A calcium aluminosilicate compound was synthesized by blending and mixing the materials to obtain the blending ratio of Test No. 1-2 in Experimental Example 1. The crushed calcium aluminosilicate compound was mixed with gypsum in the ratio shown in Table 4 to produce a hardening agent. The fluorine content in the hardening agent was adjusted by adding cryolite (commercially available product) when mixing with gypsum. A hardened mortar was produced using the produced hardening agent in the same manner as in Experimental Example 1. The results are shown in Table 4.

[0052]

[0053] (Experimental Example 4) A calcium aluminosilicate compound was synthesized by blending and mixing the materials to obtain the prescribed blending ratios shown in Table 5. The calcium aluminosilicate compound was mixed with gypsum and a grinding aid in the ratios shown in Table 5, and then ground to produce a rapid hardening material. The loss on ignition was adjusted by adjusting the temperature when mixing the calcium aluminosilicate compound and gypsum, or the amount of grinding aid. A hardened mortar was produced using the produced rapid hardening material in the same manner as in Experimental Example 1.

[0054] (Materials used) Grinding aid: diethylene glycol

[0055]

[0056] (Experimental Example 5) [Production of hardening accelerator] Using the same method as in Experimental Example 1, the materials were blended and mixed to obtain the prescribed blending ratios shown in Table 6 to synthesize a calcium aluminosilicate compound, and the synthesized calcium aluminosilicate compound was then pulverized. The pulverized calcium aluminosilicate compound was mixed with gypsum in a 1:1 ratio to produce a hardening accelerator. [Production of hardened concrete] 4,050 g of hardening accelerator, 9,450 g of ordinary Portland cement, 135 g of set retarder, 21,400 g of fine aggregate, 32,500 g of coarse aggregate, and 4,590 g of water were mixed at room temperature (20°C) to prepare a concrete composition, which was then hardened to produce a hardened concrete body. The results are shown in Table 6. (Materials used) Cement: Commercially available ordinary Portland cement (manufactured by Taiheiyo Cement Corporation, density 3.15 g / cm ３ ) Setting adjuster: A mixture of 75 parts by mass of potassium carbonate (reagent) and 25 parts by mass of citric acid (reagent) Coarse aggregate: Crushed stone Fine aggregate: Natural river sand Water: Tap water

[0057]

[0058] The rapid hardening additive containing the calcium aluminosilicate compound of the present invention can provide a rapid hardening mortar composition, a rapid hardening concrete composition, a hardened mortar body, and a hardened concrete body that can improve initial compressive strength and provide a good surface finish, and can be suitably used in the fields of civil engineering and construction.

Claims

1. Chemical composition: CaO 30% to 60% by mass, Al ２ O ３ 10% by mass or more and 60% by mass or less, SiO ２ P is 1 mass% or more and 15 mass% or less, ２ O ５ and 0.1 mass % or more and 1 mass % or less of MgO.

2. Chemical composition: Fe ２ O ３ The calcium aluminosilicate compound according to claim 1, containing 0.1 mass% or more and 3 mass% or less of the above.

3. Chemical composition: ZrO by mass ２ 3. The calcium aluminosilicate compound according to claim 1, wherein the compound is present in an amount of from 100 ppm to 5,000 ppm.

4. A hardening agent comprising 50 to 250 parts by mass of gypsum per 100 parts by mass of the calcium aluminosilicate compound according to claim 1 or 2.

5. The hardening agent according to claim 4, containing 20% ​​by mass or more and 30% by mass or less of S (sulfur) in terms of oxide.

6. The hardening agent according to claim 4, containing fluorine in a mass ratio of 300 ppm to 40,000 ppm.

7. The rapid hardening material according to claim 4, having an ignition loss of 0.1% by mass or more and 3% by mass or less before and after heat treatment from room temperature to 950°C.

8. A rapid hardening mortar material comprising cement, the rapid hardening material according to claim 4, and fine aggregate.

9. A rapid-hardening concrete material comprising cement, the rapid-hardening material according to claim 4, fine aggregate, and coarse aggregate.

10. A method for molding a hardened mortar body, comprising the steps of: producing a rapid-hardening mortar composition by kneading cement, the rapid-hardening material according to claim 4, water, and fine aggregate; layering the rapid-hardening mortar composition; and hardening the rapid-hardening mortar composition to produce a hardened mortar body.

11. A method for forming a hardened concrete body, comprising the steps of: producing a rapid-hardening concrete composition by mixing cement, the rapid-hardening material according to claim 4, water, fine aggregate, and coarse aggregate; layering the rapid-hardening concrete composition; and hardening the rapid-hardening concrete composition to produce a hardened concrete body.

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