hydraulic components

Abstract

To provide a hydraulic composition with a specific water / hydraulic powder ratio that exhibits low stiffness, maintains good fluidity, and has excellent resistance to material separation over time (for example, 10 minutes after preparation of the hydraulic composition). [Solution] A hydraulic composition comprising water, hydraulic powder, and the following component (A), optionally the following component (B), wherein the mass percentage of the water content to the hydraulic powder content in the hydraulic composition [water / hydraulic powder ratio] is 120% by mass or more and 400% by mass or less. (A): One or more selected from iotacarrageenan, cationized xanthan gum, and duttan gum. (B): One or more selected from ethanol, isopropanol, butanol, ethylene glycol, propylene glycol, and butanediol.

Description

Technical Field

[0001] The present invention relates to a hydraulic composition and a method for producing the same.

Background Art

[0002] A hydraulic composition containing a hydraulic powder such as cement may contain a thickener in order to improve physical properties such as the viscosity and material separation resistance after the preparation of the hydraulic composition.

[0003] Patent Document 1 discloses a separation-resistant cement admixture characterized in that, in order to obtain high-fluidity concrete or mortar, a polysaccharide gum is completely dissolved in a cement water-reducing agent solution when using a polysaccharide gum and a cement water-reducing agent. Patent Document 2 discloses a cement composition containing cement, dewatan gum, bentonite, and a polycarboxylic acid-based water-reducing agent. Patent Document 3 discloses a concrete or mortar admixture composition characterized in that, in a concrete or mortar composition comprising cement, aggregate, and water, (A) a polycarboxylic acid-based concrete water-reducing agent is added at 0.1 to 1.5% by weight based on the cement, (B) an oxycarboxylic acid-based concrete water-reducing agent is added at 0.01 to 0.2% by weight based on the cement, and (C) a polysaccharide-based thickener is added at 0.001 to 0.1% by weight based on the water.

[0004] In addition, the hydraulic composition is often pumped from the place where it is prepared to the place where it is used, and it is an issue to reduce the cleaning work of pipes and the like used for the supply, transfer, discharge, etc. of the hydraulic composition. And the same issues arise even in hydraulic compositions in which the material separation resistance and fluidity are controlled using a thickener as in Patent Documents 1 to 3.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] The object of the present invention is to provide a hydraulic composition with a specific [water / hydraulic powder ratio] that exhibits low stiffness, maintains good fluidity over time (for example, 10 minutes after the completion of hydraulic composition preparation), and has excellent resistance to material separation. [Means for solving the problem]

[0007] As one embodiment, the present invention provides a hydraulic composition comprising water, hydraulic powder, and component (A) below, optionally component (B) below, wherein the mass percentage of the water content to the hydraulic powder content in the hydraulic composition [water / hydraulic powder ratio] is 120% by mass or more and 400% by mass or less. (A): One or more selected from iotacarrageenan, cationized xanthan gum, and duttan gum. (B): One or more selected from ethanol, isopropanol, butanol, ethylene glycol, propylene glycol, and butanediol.

[0008] Furthermore, as another embodiment of the present invention, a method for producing a hydraulic composition comprising water, hydraulic powder, component (A), and optionally component (B), The present invention provides a method for producing a hydraulic composition, comprising the steps of: preparing a dispersion containing the aforementioned component (A), water, and one or more components selected from the aforementioned component (B); and mixing the dispersion obtained in the preceding step with hydraulic powder and water to prepare a hydraulic composition in which the mass percentage of the water content to the hydraulic powder content [water / hydraulic powder ratio] in the hydraulic composition is 120% by mass or more and 400% by mass or less. [Effects of the Invention]

[0009] According to the present invention, for example, it is possible to provide a hydraulic composition with a specific [water / hydraulic powder ratio] that can maintain good fluidity with minimal stiffness for 10 minutes from the preparation of the hydraulic composition, and has excellent resistance to material separation. [Modes for carrying out the invention]

[0010] The inventors have found that a hydraulic composition with a specific [water / hydraulic powder ratio] containing water, hydraulic powder, component (A), and optionally component (B) below, exhibits low stiffness, maintains good fluidity, and has excellent resistance to material separation (breathing suppression) over time (for example, 10 minutes after the completion of the hydraulic composition preparation). The reason for these effects is not entirely clear, but it is presumed to be as follows. The inventors have found that component (A) exhibits higher viscosity at low shear levels compared to conventional thickeners used in hydraulic compositions (for example, xanthan gum as a polysaccharide thickener and carboxymethylcellulose as a cellulose thickener), and that its thickening properties are lost when further shearing is applied, allowing hydraulic compositions containing component (A) to maintain good fluidity. Due to this effect, it is presumed that hydraulic compositions containing component (A) can maintain good fluidity and exhibit excellent resistance to material separation (breathing suppression). Furthermore, while both component (A) and conventional thickeners used in hydraulic compositions adsorb to hydraulic powders containing cement, causing coagulation and stiffening over time, the inventors have found that with hydraulic compositions containing component (A), stiffening can be reduced at specific water / hydraulic powder ratios. In this application, "over time" refers, for example, to 10 minutes from the completion of the preparation of the hydraulic composition.

[0011] [Hydraulic composition] The hydraulic composition of the present invention comprises, for example, water, hydraulic powder, component (A), and optionally component (B).

[0012] The type of water used is not particularly limited, but examples include deionized water, distilled water, tap water, groundwater, and industrial water.

[0013] Hydraulic powders are powders that harden when mixed with water, and examples include ordinary Portland cement, blast furnace cement, rapid-hardening Portland cement, ultra-rapid-hardening Portland cement, sulfate-resistant Portland cement, low-heat Portland cement, white Portland cement, and eco-cement (e.g., JIS R5214). Among these, for example, from the viewpoint of availability, preferably one or more selected from rapid-hardening Portland cement, ordinary Portland cement, and blast furnace cement, and more preferably one or more selected from blast furnace cement and ordinary Portland cement.

[0014] The hydraulic powder may include, for example, blast furnace slag, fly ash, silica fume, anhydrous gypsum, pozzolanic powder, etc., and may also include non-hydraulic limestone powder, etc. As the hydraulic powder, for example, blast furnace cement, fly ash cement, or silica fume cement may be used, which are mixtures of cement and blast furnace slag, fly ash, silica fume, etc.

[0015] <(A) component> (A) Component may be one or more selected from, for example, iotacarrageenan, cationized xanthan gum, and deutan gum.

[0016] <<Iotakarageenan>> In the present invention, the iotacarrageenan used as component (A) is composed of repeating units containing D-galactose units and 3,6-D-anhydrogalactose (3,6-AG), and may be one of three types of carrageenan with different degrees of sulfation in which the units are alternately linked by α-1,3 glycosidic bonds and β-1,4 glycosidic bonds, and contains two sulfate groups for every two of the units.

[0017] <<Cationized xanthan gum>> The cationized xanthan gum used as component (A) in the present invention, for example, has a cationic group introduced into xanthan gum and has an anionic charge derived from xanthan gum and a cationic charge derived from a quaternary ammonium salt.

[0018] The cationized xanthan gum used as component (A) is not particularly limited, and a known production method may be adopted for the production method of the cationized xanthan gum. For example, after reacting xanthan gum with a cationizing agent, the cationized xanthan gum obtained by separating the obtained reaction product may be used. As the production method of the cationized xanthan gum, for example, the production methods of the cationized xanthan gum described in the examples of WO 90 / 006174, US Patent No. 3244695, Japanese Patent Publication No. 47-2846, Japanese Patent Laid-Open No. 62-243601, Japanese Patent Laid-Open No. 2013-127019, and Japanese Patent Laid-Open No. 2007-63446 may be adopted.

[0019] The xanthan gum used in the above production method is not particularly limited, but commercially available xanthan gum may be used. The cationizing agent used in the above production method is a reagent for substituting a part of the hydroxyl groups contained in xanthan gum with a cationizing group such as a quaternary nitrogen-containing group. For example, 2,3-epoxypropyltrialkylammonium chloride, 3-chloro-2-hydroxypropyltrialkylammonium chloride, hexamethonium chloride, decamethonium chloride, phenyltrimethylammonium chloride, benzyltrimethylammonium chloride, tetra-n-butylammonium chloride, tetramethylammonium chloride, etc. may be mentioned.

[0020] As the cationized xanthan gum used as the component (A), from the viewpoint of suppressing the aggregation of the cationized xanthan gum, the effective cation charge amount of the cationized xanthan gum is preferably 0.62 meq / g or more, more preferably 0.72 meq / g or more, and preferably 1.13 meq / g or less, more preferably 0.94 meq / g or less. The effective cation charge amount of the cationized xanthan gum can be calculated by the semi-Kjeldahl method, and for example, it may be calculated by the method described in JP-A-2013-127019. In the present invention, the effective cation charge amount means the cation charge amount derived from the cationized group that the cationized xanthan gum has as a functional group, that is, the cation charge amount obtained by subtracting the cation charge amount derived from the cationizing agent remaining in the cationized xanthan gum from the cation charge amount of the cationized xanthan gum.

[0021] <<Dewtan gum>> In the present invention, the Dewtan gum used as the component (A) preferably has a structure having a main chain with repeating units containing glucose, glucuronic acid, and rhamnose, and a side chain having one or more selected from rhamnose, mannose, and fucose branched from one glucose in the main chain. The Dewtan gum used as the component (A) may preferably have a structure having a repeating unit containing a main chain with repeating units of glucose, glucuronic acid, glucose, and rhamnose, and two side chains of rhamnose branched from the second glucose.

[0022] <Component (B)> From the viewpoint of improving the dispersibility, the hydraulic composition of the present invention may optionally contain one or more selected from ethanol, isopropanol, butanol, ethylene glycol, propylene glycol, and butanediol as the component (B). From the viewpoints of availability and handleability, the component (B) may be, for example, preferably one or more selected from ethanol and propylene glycol.

[0023] <Composition, etc.> The hydraulic composition of the present invention may have a water / hydraulic powder ratio (W / C) of, for example, 120% by mass or more and 400% by mass or less. Here, the water / hydraulic powder ratio (W / C) is the mass percentage (mass%) of the water content and the hydraulic powder content in the hydraulic composition, and is calculated as water / hydraulic powder × 100. The aforementioned [water / hydraulic powder ratio] may be, for example, preferably 120% by mass or more, more preferably 200% by mass or more, even more preferably 250% by mass or more, and preferably 400% by mass or less, more preferably 390% by mass or less, and even more preferably 380% by mass or less, from the viewpoint of suppressing stiffness of the hydraulic composition over time and reducing bleeding. Furthermore, if the hydraulic powder includes powders selected from those having properties that harden through hydration reactions such as cement, as well as powders having pozzolanic properties, powders having latent hydraulic properties, and stone powder (calcium carbonate powder), the amounts of these powders are also included in the amount of hydraulic powder in this invention. The same applies to other parts by mass (mass%) etc. related to the mass of hydraulic powder.

[0024] (A) The content of component (A) is preferably 0.01% by mass or more, more preferably 0.025% by mass or more, and even more preferably 0.05% by mass or more, relative to water, from the viewpoint of suppressing bleeding and maintaining good fluidity, and preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.00% by mass or less, from the viewpoint of suppressing stiffness of the hydraulic composition over time.

[0025] Furthermore, the content of component (A) is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.15% by mass or more, relative to the hydraulic powder contained in the hydraulic composition, from the viewpoint of suppressing bleeding and maintaining good fluidity, and preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and even more preferably 3.0% by mass or less, from the viewpoint of suppressing powder aggregation and suppressing stiffness over time.

[0026] In the hydraulic composition of the present invention, the content of component (A) may be, for example, preferably 0.0075% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.015% by mass or more, from the viewpoint of suppressing bleeding and maintaining good fluidity, and preferably 1.5% by mass or less, more preferably 1.0% by mass or less, and even more preferably 0.75% by mass or less, from the viewpoint of ease of mixing and suppressing stiffness of the hydraulic composition over time.

[0027] When the hydraulic composition of the present invention contains component (B), for example, from the viewpoint of using it in a range that does not inhibit the hydration reaction of the hydraulic powder, the content of component (B) in the hydraulic composition of the present invention is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and from the viewpoint of economic efficiency, preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less.

[0028] The hydraulic composition of the present invention may optionally contain components such as dispersants, air-entraining agents, retarders, foaming agents, foaming agents, waterproofing agents, and fluidizing agents, as long as they do not affect the effects of the present invention.

[0029] The hydraulic composition of the present invention can be used, for example, for sprayed concrete, tunnel repair, construction on non-horizontal walls, as an additive for well drilling, as a foundation reinforcement liquid, pile perimeter fixing liquid, pre-packed concrete, or as a grout material such as plastic grout.

[0030] Among the above-mentioned applications, the hydraulic composition of the present invention is preferably a hydraulic composition for grout material, more preferably a hydraulic composition for tunnel repair, or a hydraulic composition for plastic grout, from the viewpoint of suppressing bleeding and maintaining stable and good fluidity of the hydraulic composition over time. Therefore, from the viewpoint of realizing long-distance pumping, the P funnel flow time immediately after preparation of the hydraulic composition of the present invention is preferably 6 seconds or more, more preferably 8 seconds or more, and preferably 12 seconds or less, and more preferably 11 seconds or less. When the P funnel flow time immediately after preparation of the hydraulic composition of the present invention is within the above range, it is suitable, for example, as a hydraulic composition for long-distance pumping exceeding 500m.

[0031] <Method for producing a hydraulic composition> As one embodiment of the present invention, the present invention provides a method for producing a hydraulic composition comprising, for example, water, hydraulic powder, component (A), and optionally component (B), A step of preparing a dispersion containing the above-mentioned component (A), water, and one or more components selected from the above-mentioned component (B), A step to prepare a hydraulic composition in which the dispersion obtained in the previous step, the hydraulic powder, and water are mixed to obtain a hydraulic composition in which the mass percentage of water content to hydraulic powder content [water / hydraulic powder ratio (W / C)] is 120% by mass or more and 400% by mass or less. A method for producing a hydraulic composition is provided, which includes [a specific component].

[0032] The method for producing the hydraulic composition of the present invention can be appropriately applied to the matters described in the hydraulic composition of the present invention. For example, specific examples and preferred embodiments of each component are the same as those of the hydraulic composition of the present invention. Furthermore, the content and mass ratio of each component in the hydraulic composition of the present invention can be applied to the method for producing the hydraulic composition of the present invention by replacing the content of each component with the blending amount.

[0033] In the step of preparing a dispersion containing component (A) and one or more selected from water and component (B) [hereinafter, the step of preparing the dispersion], from the viewpoint of suppressing the formation of granular particles by component (A), it is preferable to prepare the dispersion by adding and mixing a small amount of dispersion medium to component (A), and the dispersion medium may be one or more selected from water and component (B).

[0034] In the step of preparing the dispersion, for example, from the viewpoint of improving the dispersibility of the dispersion, the amount of component (B) in the total amount of the dispersion medium may be 0% by mass or 100% by mass.

[0035] When the dispersion medium is water, from the viewpoint of improving handling, the amount of component (A) may be preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less, relative to the water contained in the dispersion. Within the above range, the type of component (A) is not limited.

[0036] When the dispersion medium is component (B), it is not particularly limited as long as the dispersibility of component (A) in the dispersion medium is obtained. However, from the viewpoint of improving handling, the amount of component (A) blended may be preferably 50% by mass or less, more preferably 30% by mass or less, and even more preferably 10% by mass or less, relative to component (B) contained in the dispersion. Within the above range, the type of component (A) is not limited.

[0037] If other optional components are to be used, these optional components may be added during the process of preparing the dispersion.

[0038] The dispersion may be such that, visually, no adsorbent particles from component (A), for example, adsorbent particles from component (A) with a diameter of 5 mm or more, more preferably, no adsorbent particles from component (A) with a diameter of 2.5 mm or more, and even more preferably, component (A) is completely dissolved. Here, complete dissolution means a state in which no suspended matter or precipitate can be observed even after standing at 20°C for 24 hours.

[0039] In the step of preparing the dispersion, the dispersion, preferably in which component (A) is completely dissolved, may be heated and stirred as appropriate, within a range that does not affect the effects of the present invention. For example, preferably at 0°C or higher, and preferably at 60°C or lower, for example, preferably at 30 minutes or higher, and preferably at 300 minutes or lower, for example, preferably at 200 rpm or higher, and preferably at 1000 rpm or lower. Furthermore, in order to prepare the dispersion, preferably in which component (A) is completely dissolved, the pH of the dispersion may be adjusted as appropriate using a pH adjusting agent (e.g., sodium hydroxide, hydrochloric acid, etc.), although this is not particularly limited as long as it does not affect the effects of the present invention. For example, the pH may be preferably 3 or higher, and preferably 12 or lower.

[0040] In the step of preparing a hydraulic composition in which the dispersion obtained in the previous step, the hydraulic powder, and water are mixed to form a hydraulic composition in which the mass percentage of water content to hydraulic powder content [water / hydraulic powder ratio (W / C)] is 120% by mass or more and 400% by mass or less (hereinafter referred to as "the step of preparing the hydraulic composition of the present invention"), for example, the dispersion may be used as a kneading water prepared by mixing the dispersion and water, or the dispersion may be used as a kneading water as is.

[0041] In the step of preparing the hydraulic composition of the present invention, for example, after adding the hydraulic powder to the mixing water and mixing, water may be added as needed to adjust the mass percentage of the water content to the hydraulic powder content in the hydraulic composition [water / hydraulic powder ratio (W / C)] to 120% by mass or more and 400% by mass or less. From the viewpoint of suppressing stiffening of the hydraulic composition over time, the mass percentage [water / hydraulic powder ratio (W / C)] may be preferably 120% by mass or more, more preferably 200% by mass or more, even more preferably 250% by mass or more, and preferably 400% by mass or less, more preferably 390% by mass or less, and even more preferably 380% by mass or less.

[0042] [Additive composition for hydraulic compositions] As one embodiment of the present invention, an additive composition for hydraulic compositions (hereinafter also referred to as "the additive composition of the present invention") is provided, which contains component (A) and one or more selected from component (B) and water. The additive composition for hydraulic compositions of the present invention can be appropriately adapted to the matters described in the hydraulic composition of the present invention. For example, specific examples and preferred embodiments of each component are the same as those of the hydraulic composition of the present invention.

[0043] In the additive composition of the present invention, the content of component (A) may be, for example, preferably 0.10% by mass or more, more preferably 0.50% by mass or more, and even more preferably 0.75% by mass or more, from the viewpoint of economic efficiency, and preferably 40.0% by mass or less, more preferably 30.0% by mass or less, and even more preferably 20.0% by mass or less, from the viewpoint of ease of mixing and suppression of stiffness over time. The content of water and component (B) may be the remainder after removing the content of component (A).

[0044] If the additive composition of the present invention contains component (B), the content of component (B) in the additive composition may be, for example, from the viewpoint of using it in a range that does not inhibit the hydration reaction of the hydraulic powder, preferably 0% by mass or more, more preferably 10% by mass or more, even more preferably 20% by mass or more, and from the viewpoint of economic efficiency, preferably 100% by mass or less, more preferably 75% by mass or less, even more preferably 50% by mass or less, and may be 0% by mass or 100% by mass. The water content may be the remainder after excluding the content of component (A) and the content of component (B).

[0045] The additive composition of the present invention may be in liquid form, and may not contain visible traces of component (A), such as traces of component (A) with a diameter of 5 mm or more; more preferably, it may not contain traces of component (A) with a diameter of 2.5 mm or more; and even more preferably, it may be in a state in which component (A) is completely dissolved.

[0046] The additive composition of the present invention may be blended with respect to a hydraulic powder such that the content of component (A) in the additive composition of the present invention is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.15% by mass or more, from the viewpoint of suppressing bleeding and maintaining good fluidity, and preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and even more preferably 3.0% by mass or less, from the viewpoint of suppressing powder aggregation and suppressing stiffness over time.

[0047] Furthermore, the additive composition of the present invention can be incorporated into a hydraulic composition in which, for example, the mass percentage of water content to hydraulic powder content [water / hydraulic powder ratio (W / C)] is more preferably 120% by mass or more, even more preferably 200% by mass or more, even more preferably 250% by mass or more, and more preferably 400% by mass or less, even more preferably 390% by mass or less, and even more preferably 380% by mass or less.

[0048] The additive composition for hydraulic compositions of the present invention may preferably be an additive composition for hydraulic compositions for grout materials, and more preferably an additive composition for hydraulic compositions for tunnel repair or an additive composition for hydraulic compositions for plastic grout. [Examples]

[0049] The materials used in the examples and comparative examples are shown below. For the cement used, blast furnace type B cement (manufactured by Sumitomo Osaka Cement Co., Ltd., specific gravity 3.04) was used, for the water, tap water (Wakayama City tap water, specific gravity 1.00) was used, and for component (A), the following components were used. Note that the numbers in parentheses for some of the components (A) indicate the weight-average molecular weight (catalog value).

[0050] <(A) component> • Duttan Gum (5.18 million): "KELCO-VIS DG", Sansho Co., Ltd. • PEO (2 million): Polyethylene oxide "Alcox E-75", manufactured by Meisei Chemical Industry Co., Ltd. • Hydroxypropyl methylcellulose: "Metrolez 90SH-15000", Shin-Etsu Chemical Co., Ltd. • Methylcellulose: "Metholose SM-4000", Shin-Etsu Chemical Co., Ltd. • Hydroxypropylcellulose: "Hydroxypropylcellulose", Tokyo Chemical Industry Co., Ltd. • κ-carrageenan: "GENUVISCO CSW-2", Sansho Co., Ltd. • κ / λ carrageenan: "GENUVISCO CSM-2", Sansho Co., Ltd. • Roasted Bean Gum: "GRINDSTED LBG 860", Sansho Co., Ltd. • Guar gum: "JAGUAR C 14 S", Sansho Co., Ltd. • Xanthan gum: "KELZAN", Sansho Co., Ltd. • Wellangam: "BG3810", Sansho Co., Ltd. • Gellan Gum: "KELCOGEL AFT", Sansho Co., Ltd. • Hydroxyethylcellulose: "Natrosol PLUS330", manufactured by Ashland • Cationized xanthan gum: "Labor Gum CX", manufactured by DSP Gokyo Food & Chemical Co., Ltd. • Iotakarageenan: "GENUGEL CJ", manufactured by Sansho Co., Ltd.

[0051] Examples 1 and 2, and Comparative Examples 1 and 2 (1) Preparation of hydraulic composition Each of the components (A) shown in Tables 1 and 2 was added to water and stirred at 20°C for at least 60 minutes to prepare a dispersion of components (A) (hereinafter simply referred to as "dispersion"). It was confirmed that the components (A) were completely dissolved in the dispersion.

[0052] Next, water and cement were mixed to achieve the water / hydraulic powder ratio (W / C) shown in Tables 1 and 2, and stirred for 30 seconds using a commercially available hand mixer. Then, the dispersion was added to the hydraulic composition shown in Tables 1 and 2, so that the content of component (A) in the hydraulic composition shown in Tables 1 and 2 was reached, and stirring was continued for 2 minutes to prepare a slurry of the hydraulic composition. The amount of water in the slurry of the hydraulic composition was adjusted so that the sum of the amount of water initially added to the cement and the amount of water in the dispersion was equal to the amount of water shown in Tables 1 and 2. Furthermore, the amount of water (parts by mass), the amount of cement (hydraulic powder) (parts by mass), the mass percentage of the amount of water to the amount of hydraulic powder in each hydraulic composition [water / hydraulic powder ratio (W / C)], and the content of component (A) relative to water (mass%) are as shown in Tables 1 and 2, respectively.

[0053] (3) Measurement of fluidity (P funnel) In accordance with the Japan Society of Civil Engineers standard "JSCE-F 521-1999 (Fluidity Test Method for Injection Mortar of Prepacked Concrete (Method Using a P-Funnel))", 1725 mL of cement slurry of each hydraulic composition, immediately after preparation as described above, was poured into a P-funnel (Pre-Pact Flow Cone), and the flow time (seconds) from the P-funnel was measured. Furthermore, 1725 mL of cement slurry of each hydraulic composition, which had been left standing in the P-funnel for 10 minutes after preparation (12 minutes from the time water first came into contact with the hydraulic powder) (without any shearing such as stirring), was similarly measured for the flow time (seconds) from the P-funnel. The results are shown in Tables 1 and 2, respectively.

[0054] (4) Calculation of stiffness rate (%) The stiffness rate (%) for each example and comparative example obtained in (3) above was calculated using the following formula. The results are shown in Tables 1 and 2, respectively. For hydraulic composition slurries with a small stiffness rate, for example, even if the liquid delivery is stopped during pumping, the liquid delivery can be resumed as is after, for example, 10 minutes (which may include the time when water first comes into contact with the hydraulic powder).

[0055] Stiffness rate (%) = [Flow time of hydraulic composition slurry 10 minutes after preparation completion (seconds) / Flow time of hydraulic composition slurry immediately after preparation completion (seconds)] - 1

[0056] (5) Calculation of the breathing rate (%) In accordance with the Japan Society of Civil Engineers standard "JSCE-F 522-2007 (Test Method for Bleeding Rate and Expansion Rate of Injection Mortar for Prepacked Concrete (Polyethylene Bag Method))", the bleeding rate of each hydraulic composition was measured after being allowed to stand for 3 hours after preparation (including the time when water first came into contact with the hydraulic powder). The results are shown in Tables 1 and 2, respectively. A smaller bleeding rate indicates better resistance to material segregation.

[0057] [Table 1]

[0058] [Table 2]

[0059] Example 3 To prepare an ethanol dispersion of component (A) (hereinafter simply referred to as "dispersion"), 10 g of ethanol (product name "Ethanol 99.5%", manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) was added to 1 g of component (A) shown in Table 3 and mixed at 20°C. Next, water and cement were mixed at the water / hydraulic powder ratio (W / C) shown in Table 3, and a slurry of the hydraulic composition was prepared as the hydraulic composition shown in Table 3, similar to Examples 1 and 2, so that the content of each component in the hydraulic composition shown in Table 3 was obtained. Similar to Examples 1 and 2, the viscosity (P funnel), stiffness rate (%), and bleeding rate (%) were evaluated. The results are shown in Table 3.

[0060] [Table 3]

[0061] The slurry of the hydraulic compositions in Examples 1 to 3 exhibits little stiffness 10 minutes after preparation of the hydraulic composition. Therefore, for example, even if the slurry remains in the piping used for supplying, transferring, and discharging the hydraulic composition, the liquid supply can be stopped for about 10 minutes (which may include the time when water first comes into contact with the hydraulic powder) and the liquid supply can be resumed without any problems.

Claims

1. A hydraulic composition comprising water, a hydraulic powder, and the following component (A), optionally the following component (B), A hydraulic composition in which the mass percentage of water content to hydraulic powder content [water / hydraulic powder ratio (W / C)] is 120% by mass or more and 400% by mass or less. (A): One or more selected from iotacarrageenan, cationized xanthan gum, and deutan gum. (B): One or more selected from ethanol, isopropanol, butanol, ethylene glycol, propylene glycol, and butanediol.

2. The hydraulic composition according to claim 1, wherein the content of component (A) is 0.01% by mass or more and 2.00% by mass or less relative to water.

3. The hydraulic composition according to claim 1 or 2, wherein the flow time through a P funnel immediately after preparation of the hydraulic composition is 6 seconds or more and 12 seconds or less.

4. The hydraulic composition according to claim 1 or 2, wherein the content of component (B) is 0.01% by mass or more and 10% by mass or less.

5. A hydraulic composition according to claim 1 or 2, for use as a grouting material.

6. A method for producing a hydraulic composition comprising water, a hydraulic powder, the following component (A), and optionally the following component (B), A step of preparing a dispersion containing the above-mentioned component (A), water, and one or more components selected from the above-mentioned component (B), A step to prepare a hydraulic composition in which the mass percentage of water content to hydraulic powder content [water / hydraulic powder ratio (W / C)] is 120% by mass or more and 400% by mass or less, by mixing the dispersion obtained in the previous step with the hydraulic powder and water. including, A method for producing a hydraulic composition. (A): One or more selected from iotacarrageenan, cationized xanthan gum, and deutan gum. (B): One or more selected from ethanol, isopropanol, butanol, ethylene glycol, propylene glycol, and butanediol.

7. An additive composition for hydraulic compositions, comprising the following component (A), water, and one or more components selected from the following component (B). (A): One or more selected from iotacarrageenan, cationized xanthan gum, and deutan gum. (B): One or more selected from ethanol, isopropanol, butanol, ethylene glycol, propylene glycol, and butanediol.

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