JP7355953B1 - Liquid quick-setting agent, repair material, cured product - Google Patents

Abstract

An object of the present invention is to provide a liquid quick-setting agent that has excellent storage stability and provides good adhesion when used with a cement composition. [Solution] A liquid quick-setting agent used with a cement composition containing cement, a polymer, and a fine aggregate, which contains an aluminum component and a sulfur component, and is obtained by 27Al-NMR measured under the following conditions. It is a liquid quick-setting agent that has a peak in the chemical shift range of -1.0 ppm or more and 3.0 ppm or less in the spectrum. (Conditions) Observation core: 27Al sample tube Rotation speed: 12Hz Measurement temperature: 25°C Pulse width: 5 μsec (45° pulse) Waiting time: 5 seconds External standard: Aluminum chloride aqueous solution [Selection diagram] None

Description

The present invention relates to a liquid quick-setting agent, a repair material, and a cured product.

Conventionally, when rapid setting properties of sprayed materials are required in tunnel construction, repair work of concrete structures, etc., quick setting agents have been used together with the sprayed materials.
There are mainly two types of quick-setting agents: powder and liquid. Liquid quick-setting agents generally have lower quick-setting properties than powder quick-setting agents, so as an improvement measure, for example, patented Measures have been taken to improve the strength by increasing the sulfate ion concentration, as shown in Document 1.

Japanese Patent Application Publication No. 2006-193388

However, when high-concentration liquid quick-setting agents are stored for a long period of time, precipitates may form in the liquid, the liquid may gel, or suspended particles may settle. The solubility of aluminum sulfate in water is 27% at 20°C, and it varies depending on coexisting solutes and liquid temperature, but liquid quick-setting agents containing aluminum sulfate with a higher solubility have poor storage stability and may have a negative effect on cement composition. Adhesion was sometimes an issue when combined with objects.

In light of the above, an object of the present invention is to provide a liquid quick-setting agent that has excellent storage stability and provides good adhesion when used with a cement composition.

As a result of intensive studies based on the above-mentioned problems, the present inventors found that a liquid containing an aluminum component and a sulfur component and having a peak at a specific chemical shift in the spectrum obtained by ²⁷ Al-NMR. The inventors have discovered that an quick-setting agent can solve the above problems, and have completed the present invention. That is, the present invention is as follows.

[1] A liquid quick-setting agent used with a cement composition containing cement, a polymer, and a fine aggregate, containing an aluminum component and a sulfur component, and obtained by ²⁷ Al-NMR measured under the following conditions. A liquid quick-setting agent having a peak in the chemical shift range of -1.0 ppm or more and 3.0 ppm or less in the spectrum.
(conditions)
Observation core: ²⁷ Al
Sample tube rotation speed: 12Hz
Measurement temperature: 25℃
Pulse width: 5μsec (45° pulse)
Waiting time: 5 seconds External standard: Aluminum chloride aqueous solution [2] A liquid quick-setting agent for repair used with cement compositions containing cement and fine aggregate, containing aluminum and sulfur components, and containing the following: A liquid quick-setting agent for repair, which has a peak in the chemical shift range of -1.0 ppm or more and 3.0 ppm or less in a spectrum obtained by 27 Al-NMR measured under ²⁷ Al-NMR conditions.
(conditions)
Observation core: ²⁷ Al
Sample tube rotation speed: 12Hz
Measurement temperature: 25℃
Pulse width: 5μsec (45° pulse)
Waiting time: 5 seconds External standard: Aluminum chloride aqueous solution [3] Chemical shift - The half width of the peak in the range of -1.0 ppm to 3.0 ppm is 10.0 ppm or less [1] or [2] A liquid quick-setting agent as described in .
[4] The liquid according to any one of [1] to [3] above, wherein the total alkali amount R ₂ O (R is an alkali metal) in the liquid quick-setting agent is 1.0% by mass or less. Rapid setting agent.
[5] A repair material containing a cement composition containing cement, a polymer, and fine aggregate, and the liquid quick-setting agent according to any one of [1], [3], or [4] above.
[6] A repair material containing a cement composition containing cement and fine aggregate, and the liquid quick-setting agent according to any one of [2] to [4] above.
[7] The repair material according to [6] above, wherein the liquid quick-setting agent further contains a polymer.
[8] The repair material according to any one of [5] to [7] above, wherein the content of fine aggregate in the composition is 40 to 300 parts by mass based on 100 parts by mass of the cement. .
[9] A cured product using the repair material according to any one of [5] to [8] above.

According to the present invention, it is possible to provide a liquid quick-setting agent that has excellent storage stability and provides good adhesion when used with a cement composition.

Hereinafter, an embodiment (this embodiment) of the present invention will be described in detail, but the present invention is not limited to this embodiment. Note that "%" in this specification is based on mass unless otherwise specified.

[1. Liquid quick setting agent]
A first aspect of the liquid quick-setting agent according to the present embodiment is a liquid quick-setting agent that is used with a cement composition containing cement, a polymer, and a fine aggregate, and contains an aluminum component and a sulfur component, and includes the following: It is a liquid quick-setting agent that has a peak in the chemical shift range of -1.0 ppm or more and 3.0 ppm or less in a spectrum obtained by ²⁷ Al-NMR measured under the following conditions. The liquid quick-setting agent of the present invention contains an aluminum component and a sulfur component, and has a peak at a predetermined position in the spectrum obtained by ²⁷ Al-NMR, so it has excellent storage stability and can be used for cement, polymer, etc. When used with a cement composition containing fine aggregate, it improves adhesion by suppressing sagging and improving adhesion strength.
(conditions)
Observation core: ²⁷ Al
Sample tube rotation speed: 12Hz
Measurement temperature: 25℃
Pulse width: 5μsec (45° pulse)
Waiting time: 5 seconds External standard: Aluminum chloride aqueous solution

Further, a second aspect of the liquid quick-setting agent according to the present embodiment is a liquid quick-setting agent for repair that is used with a cement composition containing cement and fine aggregate, and which contains an aluminum component and a sulfur component. However, in the spectrum obtained by ²⁷ Al-NMR measured under the conditions described above, it is a liquid quick-setting agent for repair that has a peak in the chemical shift range of -1.0 ppm or more and 3.0 ppm or less. The liquid quick setting agent of the present invention contains an aluminum component and a sulfur component, and has a peak at a predetermined position in the spectrum obtained by ²⁷ Al-NMR, so it has excellent storage stability and is suitable for cement and fine bone. When used for repair purposes together with a cement composition containing wood, it improves adhesion by suppressing sagging and improving adhesion strength.

The liquid quick setting agent of the first aspect and the second aspect has a peak in a chemical shift range of −1.0 ppm or more and 3.0 ppm or less in the spectrum obtained by ²⁷ Al-NMR. Further, the half width of the peak is, for example, preferably 10.0 ppm or less, more preferably 9.0 ppm or less, and even more preferably 8.0 ppm or less. Thereby, the storage stability of the liquid quick setting agent can be improved. Note that the half width may be, for example, 0.1 ppm or more. Note that ^{the 27} Al-NMR measurement of the liquid quick setting agent can be performed using a commercially available measuring device, for example, a superconducting nuclear magnetic resonance device (ECX-400) manufactured by JEOL.
Hereinafter, the first aspect and the second aspect may be collectively referred to simply as a liquid quick-setting agent.

The liquid quick setting agent contains an aluminum component and a sulfur component. As a raw material for the aluminum component, for example, aluminum sulfate, various alums, and aluminum hydroxide can be used, and as a raw material for the sulfur component, sulfuric acid or the like can be used. Here, in the ratio of the aluminum-containing raw material to the sulfur-containing raw material, if the ratio of the aluminum-containing raw material is increased, the above chemical shift will easily fall within the desired range, and if the ratio of the sulfur-containing raw material is increased, the half-value width will be It tends to become smaller.

From the viewpoint of adhesion and storage stability, the aluminum component in the liquid quick-setting agent is 3.0 to 20.0% in terms of Al ₂ O ₃ , assuming that the mass of the liquid quick-setting agent is 100%. .0 to 18.0% is preferable, and 7.0 to 15.0% is more preferable. The content of the aluminum component in the liquid quick-setting agent can be adjusted to the above range in terms of Al ₂ O ₃ by adjusting the amount of raw material for the aluminum component used when preparing the liquid quick-setting agent. It can be within.

From the viewpoint of adhesion and storage stability, the sulfur component in the liquid quick-setting agent is 10.0 to 30.0% in terms of SO ₃ , assuming that the mass of the liquid quick-setting agent is 100%. 0 to 29.0% is preferable, and 15.0 to 20.5% is more preferable. The content of the sulfur component in the liquid quick-setting agent can be adjusted to within the above range in terms of SO ₃ by adjusting the amount of the raw material for the sulfur component used when preparing the liquid quick-setting agent. can do.

From the viewpoint of environmental conservation, the liquid quick-setting agent preferably has a fluoride ion concentration of 500 ppm or less, more preferably 450 ppm or less, even more preferably 350 ppm or less, and may be 0 ppm. In the present invention, the concentration of fluoride ions in the liquid quick-setting agent can be measured using a commercially available analyzer, for example, ion chromatography (ICS2100) manufactured by Thermo Scientific. At the time of analysis, measurement can be performed by diluting the fluoride ion in advance so that it falls within the calibration curve.

The pH of the liquid quick-setting agent is preferably 7 or less, more preferably 5 or less. When the pH is 7 or less, it is possible to reduce the environmental load and suppress the adverse effects on the human body. Moreover, it is preferable that pH is 2 or more. Note that the pH of the liquid quick-setting agent can be measured using a pH meter.

From the viewpoint of worker safety, the total alkali content R ₂ O (R is an alkali metal) in the liquid quick-setting agent is preferably 1.0% or less, more preferably 0.8% or less, and 0.5% or less. is even more preferable. Further, it may be 0% or more. Incidentally, the total amount of alkali R ₂ O in the liquid quick-setting agent can be measured by atomic absorption method.

The liquid quick-setting agent can be obtained, for example, by mixing raw materials such as aluminum sulfate, various alums, aluminum hydroxide, and sulfuric acid, and heating and reacting the mixture. The heating temperature is preferably 70 to 100°C, more preferably 85 to 100°C, even more preferably 85 to 95°C. The reaction time is preferably 30 to 150 minutes, more preferably 60 to 150 minutes, even more preferably 90 to 120 minutes.

In addition to the above-mentioned components, the liquid quick-setting agent can contain various additives as long as they do not impede the effects of the present invention, but from the viewpoint of ease of handling, it is preferable not to contain sodium aluminate.

[2. Repair materials】
The repair material according to this embodiment contains a cement composition containing cement, a polymer, and fine aggregate, and the liquid quick-setting agent of the present invention. The content of the liquid quick-setting agent in the repair material is preferably 0.01 to 20 parts by mass, more preferably 0.03 to 10 parts by mass, and 0.05 parts by mass, relative to 100 parts by mass of cement in the cement composition. -5 parts by mass is more preferred. When the content of the liquid quick setting agent in the repair material is within the above range, the adhesion of the repair material can be improved.

Cement is not particularly limited, and includes various types of cement such as normal, early strength, super early strength, low heat, and medium heat, various mixed cements in which these cements are mixed with blast furnace slag, fly ash, silica fume, etc., and urban cement. Examples include environmentally friendly cement (ecocement) manufactured using garbage incineration ash and sewage sludge incineration ash, and commercially available fine particle cement, and it is also possible to use various cements and mixed cements after pulverizing them. It is. Further, it is also possible to use a cement that has been adjusted by increasing or decreasing the amount of components (for example, gypsum, etc.) normally used in cement.
In the present invention, from the viewpoint of adhesion, it is preferable to select ordinary Portland cement or early strength Portland cement.

From the viewpoint of manufacturing cost and strength development, the Blaine specific surface area value of the cement is preferably 2,500 to 7,000 cm 2 /g, and preferably 2,750 ^{cm 2 /} g to 6,000 cm ² /g. It is more preferably 3,000 cm ² /g to 4,500 cm ² /g.
The Blaine specific surface area value is determined in accordance with JIS R 5201:2015 (physical testing method for cement).

The fine aggregate is not particularly limited, and fine aggregates similar to those used for ordinary cement mortar and concrete can be used. That is, river sand, crushed stone, crushed sand, lime sand, silica sand, colored sand, artificial lightweight aggregate, etc. can be used, and it is also possible to combine these. In particular, it is preferable to use siliceous silica sand or lime sand, and the particle size of the fine aggregate is preferably JIS No. 6 to 8.

The content of fine aggregate in the cement composition is preferably 40 to 300 parts by mass, more preferably 45 to 275 parts by mass, and 50 to 250 parts by mass based on 100 parts by mass of cement. It is even more preferable that there be. When the content of the fine aggregate is within the above range, the adhesion of the repair material can be improved.

Preferably, the cement composition further contains a polymer. Examples of polymers include, but are not limited to, rubber latex such as acrylonitrile-butadiene rubber, styrene-butadiene rubber, chloroprene rubber, natural rubber, ethylene-vinyl acetate copolymer, polyacrylic acid ester, Examples include resin emulsions such as styrene/acrylic ester copolymers, acrylic ester copolymers typified by acrylonitrile/acrylic esters, and vinyl acetate vinyl versatate copolymers.
The form of the polymer includes a re-emulsifiable powder type and a liquid type, and is used to improve adhesion and the durability of mortar.

The solid content of the polymer in the cement composition is preferably 1 to 20 parts by mass, more preferably 2 to 18 parts by mass, and 3 to 15 parts by mass based on 100 parts by mass of cement. It is more preferable that When the content ratio of the polymer is within the above range, the adhesion of the repair material can be improved.

Preferably, the cement composition further contains fibers. The fibers are not particularly limited, but include, for example, polymer fibers such as vinylon fibers, propylene fibers, acrylic fibers, nylon fibers, and aramid fibers, steel fibers, glass fibers, carbon fibers, and basalt fibers. Examples include inorganic fibers such as fibers made from melt-spun rocks.

The content ratio of fibers in the cement composition is preferably 0.02 to 3.0 parts by mass, more preferably 0.03 to 2.5 parts by mass, based on 100 parts by mass of cement. More preferably, it is 0.05 to 2.0 parts by mass. When the fiber content is 0.02 parts by mass or more, the effect of improving adhesion can be sufficiently exhibited. Moreover, fluidity can be improved because the content ratio of fibers is 1.5 parts by mass or less. The length of the fiber is preferably 15 mm or less, more preferably 12 mm or less, and even more preferably 10 mm or less, from the viewpoint of the aesthetic appearance of the troweled surface. The lower limit of the fiber length is not particularly limited, and may be, for example, 1 mm or more.

Preferably, the cement composition further contains a water reducing agent. The water reducing agent is not particularly limited, and examples thereof include naphthalene water reducing agents, melamine water reducing agents, aminosulfonic acid water reducing agents, and polycarboxylic acid water reducing agents. One or more of these can be used.

The content ratio of the water reducing agent in the cement composition is preferably 0.1 to 2 parts by mass, more preferably 0.2 to 1.8 parts by mass, and more preferably 0.3 parts by mass in terms of solid content per 100 parts by mass of cement. More preferably 1.0 parts by mass. Sufficient fluidity can be obtained because the content rate of the water reducing agent is at least the above lower limit. Moreover, material separation can be suppressed because the content rate of the water reducing agent is below the above-mentioned upper limit.

The cement composition may further contain a rapidly hardening material. The rapidly hardening material is not particularly limited as long as it promotes coagulation and increases strength in a short period of time. Rapidly hardening materials use calcium salts of organic acids such as calcium formate, nitrates, sulfates, carbonates, thiocyanates, amines, maleic anhydride, and silicic acids such as water glass to promote coagulation. Salts, aluminum sulfate, aluminum salts typified by alum, calcium aluminate (calcium aluminate), aluminates, and the like. Among these, from the viewpoint of strength development, aluminates are preferred, and calcium aluminate (CA) is preferably included.

Calcium aluminate is a product with hydration activity mainly composed of CaO and Al ₂ O ₃ , which is obtained by mixing calcia raw materials and alumina raw materials, etc., and firing the mixture in a kiln or melting it in an electric furnace and cooling it. It is a general term for substances that have a crystalline structure, and can be used regardless of whether it is crystalline or amorphous. This material has a quick curing time and high initial strength development. A typical example of calcium aluminate is alumina cement, and commercially available products can usually be used. For example, alumina cement No. 1, alumina cement No. 2, etc. can be used. Among these, amorphous calcium aluminate, which is rapidly cooled after melting, is preferred because it hardens in a shorter time than alumina cement and has higher initial strength development thereafter.
Among calcium aluminates, the molar ratio between CaO and Al ₂ O ₃ (CaO/Al ₂ O ₃ molar ratio) is preferably 1.0 to 3.0, preferably 1.7 to 2.5. It is more preferable that there be. When the molar ratio is within the above range, the curing time can be further shortened and the initial strength development property can be improved.

The content ratio of the rapidly hardening material used in the present invention is preferably 1 to 30 parts by mass, more preferably 3 to 25 parts by mass, and 5 to 20 parts by mass based on 100 parts by mass of cement. It is even more preferable that there be. In addition, when calcium aluminate is contained as a rapidly hardening material, the content ratio of calcium aluminate is preferably 2 to 20 parts by mass, and preferably 3 to 18 parts by mass, based on 100 parts by mass of cement. The amount is more preferably 4 to 15 parts by mass. When the content ratio of the rapidly hardening material is equal to or higher than the above lower limit, the strength development property is likely to be good.

In the present invention, setting regulators, AE agents, rust preventive agents, water repellents, antibacterial agents, coloring agents, antifreeze agents, fine limestone powder, fine blast furnace slowly cooled slag powder, sewage sludge, etc. Incineration ash and its molten slag, municipal waste incineration ash and its molten slag, admixtures such as pulp sludge incineration ash, antifoaming agents, thickeners, shrinkage reducing agents, clay minerals such as bentonite and sepiolite, and hydrotal. It is possible to use one or more types of anion exchangers such as sites within a range that does not substantially impede the object of the present invention.

In the repair material of the present invention, the method of mixing each material is not particularly limited, and each material may be mixed at the time of construction, or some or all of the materials may be mixed in advance. . For example, when using the spraying method, the repair material can be sprayed by mixing the materials of the cement composition in advance and mixing the liquid quick-setting agent at the time of spraying. As the mixing device, any existing device can be used, such as a tilting mixer, an omni mixer, a Henschel mixer, a V-type mixer, and a Nauta mixer.

[3. Hardened body]
The cured body according to this embodiment is a cured body made using the repair material of the present invention. The repair material of the present invention is kneaded with water, and a hardened product is usually formed by applying it with a plastering trowel or by spraying it by force-feeding it to the construction site with a squeeze-type mortar pump or the like and spraying it with a spray nozzle. be able to.

The amount of mixing water is not particularly limited as it varies depending on the purpose/application and the content ratio of each material, but it is preferably 5 to 70 parts by mass, and 8 parts by mass based on 100 parts by mass of the repair material. It is more preferably from 10 to 60 parts by weight, and even more preferably from 10 to 60 parts by weight. When the mixing water amount is at least the above lower limit, it is possible to suppress a decrease in fluidity and to suppress an extremely large amount of heat generated. Moreover, strength development property can be ensured because the mixing water amount is below the above-mentioned upper limit.

In the present invention, the method of mixing the repair material and water is not particularly limited, but it is preferable to use a hand mixer with a rotation speed of 900 rpm or more, a normal mortar mixer, or a biaxial forced mixer. .
When mixing with a hand mixer or mortar mixer, for example, you can first put a predetermined amount of water into a container such as a pail or a mixer, then add the remaining repair material while rotating the mixer, and mix for at least 3 minutes. preferable. Further, when mixing with a forced mixer, for example, it is preferable to put the repair material into the mixer in advance, add a predetermined amount of water while rotating the mixer, and mix for at least 4 minutes.

Hereinafter, the present invention will be explained in more detail using Examples and Comparative Examples, but the present invention is not limited to the following Examples unless it departs from the gist thereof.

[Examples 1 to 7]
<Preparation of liquid quick setting agent>
Various raw materials were adjusted and mixed so that the aluminum component and sulfur component were in the amounts shown in Table 1 in terms of Al ₂ O ₃ and SO ₃ , respectively, and a liquid quick-setting agent was prepared by heating at 90 ° C. for 2 hours. .

<Materials used>
Aluminum component source: Aluminum hydroxide, for industrial supplies Sulfur component source: Sulfuric acid, for industrial supplies Solvent: Pure water

< ²⁷ Al-NMR measurement>
The prepared liquid quick-setting agent was tested under the following conditions using a superconducting nuclear magnetic resonance apparatus (ECX-400, manufactured by JEOL Ltd.), and the chemical shift and half-value width of the peak were measured. The results are shown in Table 1 below.

< ²⁷ Al-NMR measurement conditions>
Observation core: ²⁷ Al
Sample tube rotation speed: 12Hz
Measurement temperature: 25℃
Pulse width: 5μsec (45° pulse)
Waiting time: 5 seconds External standard: Aluminum chloride aqueous solution

<Storage test>
A storage test was conducted to evaluate the storage stability of the liquid quick setting agent. Decreased storage properties result in the formation of precipitates in the liquid accelerator, especially in low temperature environments. The liquid quick-setting agent was allowed to stand in a 10° C. environment for one month, and the precipitate was extracted using filter paper, and the amount of precipitate per 100 g of the liquid quick-setting agent was calculated. The results are shown in Table 1 below.

[Comparative Examples 1 to 4]
Liquid quick-setting agents were prepared in the same manner as in Examples 1 to 7, and evaluated by each test. The results are shown in Table 1.

(Experiment example 1)
<Preparation of repair material>
A cement composition was prepared by adding 200 parts by mass of fine aggregate, 0.1 parts by mass of fibers, 0.5 parts by mass of water reducing agent, and 14 parts by mass of water to 100 parts by mass of cement. 6 parts by mass of the liquid quick-setting agents of Examples 1 to 5 and Comparative Examples 1 to 2 were mixed with 100 parts by mass of cement in this cement composition to prepare repair materials.

<Compressive strength test>
Compressive strength: The compressive strength was measured at 1 day and 28 days of material age by spraying on a formwork according to JSCE-G 561-2010. The test results are shown in Table 2 below.

<Thick coating test (presence or absence)>
Mortar was sprayed into a formwork of 10 mm thick x 150 mm long x 250 mm wide using a flat concrete plate as the base, and after finishing with a trowel, the frame was removed, and the test specimen was immediately stood vertically and allowed to stand for one day. I checked to see if anyone was there. The test results are shown in Table 2 below.

<Adhesion strength test>
Adhesion strength: A test piece was prepared by spraying 60 mm of the repair material onto a 300 x 300 x 60 mm pavement board. On the 28th day of the material age, the material was cored with a diameter of 55 mm, and the adhesion strength was measured using a Kenken type adhesion tester (manufactured by Ox Jack Co., Ltd.). The test results are shown in Table 2 below.

(Experiment example 2)
<Preparation of repair material>
For 100 parts by mass of cement, 200 parts by mass of fine aggregate, 3.0 parts by mass of polymer (polyacrylic acid ester re-emulsified resin, commercially available product, moisture content 0.8%, density 0.5 g/mL), 0 parts by mass of fibers. .1 part by mass, 0.5 parts by mass of water reducing agent, and 14 parts by mass of water to prepare a cement composition. 6 parts by mass of the liquid quick-setting agents of Examples 1 to 5 and Comparative Examples 1 to 2 were mixed with 100 parts by mass of cement in this cement composition to prepare repair materials. The compressive strength, thick coating property, and adhesion strength of the obtained repair material were measured by the same method as in Experimental Example 1. The results are shown in Table 3 below.

The liquid quick-setting agent of the present invention is suitable for, for example, cement concrete sprayed onto exposed ground surfaces such as tunnels for roads, railways, and headrace channels, and slopes, and as repair materials for concrete structures. Can be used for

Claims (9)

A liquid quick-setting agent for use with a cement composition containing cement, a polymer, and fine aggregate, comprising:
Contains an aluminum component and a sulfur component,
A liquid quick setting agent having a peak in the chemical shift range of -1.0 ppm or more and 3.0 ppm or less in a spectrum obtained by ²⁷ Al-NMR measured under the following conditions.
(conditions)
Observation core: ²⁷ Al
Sample tube rotation speed: 12Hz
Measurement temperature: 25℃
Pulse width: 5μsec (45° pulse)
Waiting time: 5 seconds External standard: Aluminum chloride aqueous solution A repair liquid quick setting agent used with a cement composition containing cement and fine aggregate,
Contains an aluminum component and a sulfur component,
A liquid quick-setting agent for repair, which has a peak in the chemical shift range of -1.0 ppm or more and 3.0 ppm or less in a spectrum obtained by ²⁷ Al-NMR measured under the following conditions.
(conditions)
Observation core: ²⁷ Al
Sample tube rotation speed: 12Hz
Measurement temperature: 25℃
Pulse width: 5μsec (45° pulse)
Waiting time: 5 seconds External standard: Aluminum chloride aqueous solution The liquid quick-setting agent according to claim 1 or 2, wherein the half width of the peak in the chemical shift range of -1.0 ppm or more and 3.0 ppm or less is 10.0 ppm or less. The liquid quick-setting agent according to claim 1 or 2, wherein the total alkali amount R ₂ O (R is an alkali metal) in the liquid quick-setting agent is 1.0% by mass or less. A repair material comprising a cement composition containing cement, a polymer, and fine aggregate, and a liquid quick-setting agent according to claim 1. A repair material comprising a cement composition containing cement and fine aggregate, and the liquid quick-setting agent according to claim 2. 7. The repair material of claim 6, wherein the cement composition further contains a polymer. The repair material according to any one of claims 5 to 7, wherein the content of fine aggregate in the cement composition is 40 to 300 parts by mass based on 100 parts by mass of the cement. A cured body made of the repair material according to any one of claims 5 to 7.