KR101729216B1 - Accelerator for freeze protection of exothermal concrete - Google Patents
Accelerator for freeze protection of exothermal concrete Download PDFInfo
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- KR101729216B1 KR101729216B1 KR1020150092728A KR20150092728A KR101729216B1 KR 101729216 B1 KR101729216 B1 KR 101729216B1 KR 1020150092728 A KR1020150092728 A KR 1020150092728A KR 20150092728 A KR20150092728 A KR 20150092728A KR 101729216 B1 KR101729216 B1 KR 101729216B1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a cold weather accelerator composition for exothermic concrete capable of exhibiting early strength.
The present invention relates to a cold weather accelerator composition for exothermic concrete capable of exhibiting an early strength, which is added for imparting a flowability, and which comprises calcium nitrate, calcium nitrite and lithium nitrite; (PF), potassium acetate (PA), calcium formate (CF), potassium nitrate, tartaric acid, and lithium carbonate, which are added to control the setting time and the heating time of the concrete. A second admixture comprising; And a compounding water used for mixing the first admixture and the second admixing agent.
According to the present invention, an admixture containing calcium nitrate, calcium nitrite, and lithium nitrite is mixed with the compounding water and an admixture compounded in an optimum ratio according to the type of cement is further added for controlling the setting time and the heating time In addition, it is possible to prevent the concrete from freezing by inducing an exothermic reaction initially at a subzero temperature, and to increase the initial compressive strength.
Description
The present invention relates to a cold accelerator composition for exothermic concrete capable of exhibiting early strength, and more particularly, to a composition for cold acclimatization for exothermic concrete which is capable of exhibiting early strength, and more particularly, It is possible to prevent the freezing of concrete by inducing an exothermic reaction initially at sub-zero temperature in application to cold-weather concrete by adding liquid admixture with optimal admixture according to cement kind. And an initial strength capable of improving the initial compressive strength.
Recently, as the environmental problems have been socially all over the world, studies on eco-friendly construction methods and construction materials have been actively conducted in the field of construction, and researches for the development of eco-friendly concrete considering the environment have been actively conducted in the field of concrete have.
In Korea, efforts to protect the environment are urgently required. Therefore, much research is being conducted to convert cement concrete, which has been used for a long time as one of the representative materials of civil engineering and construction, into environmentally friendly materials.
Concrete curing, on the other hand, is a work to protect the necessary temperature and humidity in the initial stage where the hydration process is relatively rapid, and to protect the concrete until the required strength is developed after the installation so that it does not have harmful effects such as load or impact. The plan has a great influence on the overall air and concrete durability, so careful attention is needed.
Under the weather conditions where the average temperature of the day is less than 4 ℃, the curing hardening reaction is very delayed, and concrete may freeze at night or at dawn as well as during the daytime. In the construction of cold concrete, appropriate measures should be taken for materials, blending, conveying, striking, chopping, curing, formwork and shore so that the quality of the concrete is not frozen.
The construction method of the above-mentioned cold-rolled concrete should be applied with caution and warmth at 0 ~ 4 ℃, and it is necessary to heat water, water and aggregate at -3 ~ 0 ℃, and it requires some warming. When the temperature is below -3 ℃, the water and aggregate are heated to increase the temperature of the concrete. In addition, full-scale concrete construction is carried out such as keeping the concrete at the required temperature by proper warming and rapid heating as required.
When the concrete is frozen at the initial stage of curing, the chemical reaction of the cement does not proceed well, and even if cured at a suitable temperature thereafter, the strength, durability and watertightness will be adversely affected in the future. Therefore, at the time of construction at low temperature, it should not be frozen at the beginning of curing hardening, have sufficient resistance to the freezing and thawing action to be taken until the temperature after curing is finished, and have sufficient strength for the expected load at each stage of construction , Curing should be done to ensure that the finished structure has the required strength, durability, and watertightness.
In conventional cold-water concrete construction, anti-freezing agent and cold resistance promoter are used to prevent early frost damage and to secure early strength, and curing and curing to maintain a certain level of temperature by installing a tent and stove when concrete is poured. . This is to prevent the moisture inside the concrete from freezing around 5 ℃ and delaying the hydration and condensation reaction of the cement. Especially, it should be applied so that the temperature is not exposed to outside air immediately after concrete pouring so that the temperature does not drop sharply.
However, in order to prevent freezing of concrete in extreme environments (0 ~ -15 ℃, etc.), the use amount of agitator is increased and used .
In case of concrete construction at home and abroad, when concrete is constructed at below 5 ~ 10 ℃, the tent and stove are installed before using the agitator to maintain the temperature as an image. If the amount of agitator is increased It is difficult to control the physical properties and workability of the concrete, so that the use of the agitation agent at a certain ratio or more is avoided.
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The present invention relates to a method for preparing a cement admixture which comprises admixing an admixture containing calcium nitrate, calcium nitrite and lithium nitrite to a mixed water and further adding an admixture blended at an optimum ratio according to the type of cement And a cold-weather accelerator composition capable of exhibiting an early strength.
In addition, the present invention relates to a method for producing a cold-rolled steel sheet, which is capable of preventing freezing of concrete by inducing an exothermic reaction even at a sub- Promoter composition.
Further, according to the present invention, the concrete is laid by using the cold and cold accelerator mixed in the optimum ratio according to the kind of cement, so that even when the concrete is frozen under severe conditions of 0 ° C or less, excellent strength and workability The present invention provides a heat resistance promoter composition for a heat-generating concrete.
The various problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.
The present invention relates to a cold weather accelerator composition for heat-generating concrete, which is added for imparting a flowability, and which comprises calcium nitrate, calcium nitrite and lithium nitrite; (PF), potassium acetate (PA), calcium formate (CF), potassium nitrate, tartaric acid, and lithium carbonate, which are added to control the setting time and the heating time of the concrete. A second admixture comprising; And a compounding water used for mixing the first admixture and the second admixing agent.
Wherein the first admixture is used in an amount of 20 to 30 parts by weight of calcium nitrate, 5 to 15 parts by weight of calcium nitrite, and 2 to 10 parts by weight of lithium nitrite, when the cold weather accelerator is blended with ordinary Portland cement, 1 to 15 parts by weight of the potassium formate, 1 to 15 parts by weight of the potassium acetate, and 0.1 to 10 parts by weight of the calcium formate are used as the admixture, and the potassium formate, the potassium acetate and the calcium formate are used, The compounding number may be 55 to 65 parts by weight.
Wherein the first admixture is used in an amount of 20 to 30 parts by weight of calcium nitrate, 5 to 15 parts by weight of calcium nitrite, and 2 to 10 parts by weight of lithium nitrite, and the second admixture is selected from the group consisting of potassium formate Potassium acetate and potassium nitrate are used, the potassium formate is used in an amount of 1 to 15 parts by weight, the potassium acetate is used in an amount of 1 to 15 parts by weight, the potassium nitrate is used in an amount of 0.1 to 10 parts by weight, Weight parts can be used.
Wherein the first admixture is used in an amount of 20 to 30 parts by weight of calcium nitrate, 5 to 15 parts by weight of calcium nitrite and 2 to 10 parts by weight of lithium nitrite, and the second admixture is a mixture of
The general weather resistance accelerator for ordinary Portland cement, which is one kind of cement, comprises a first admixture composed of 23 parts by weight of calcium nitrate, 7.5 parts by weight of calcium nitrite and 5.5 parts by weight of lithium nitrite, 1.5 parts by weight of potassium formate (PF) ), And 0.5 part by weight of calcium formate (CF) to 60 parts by weight of the compounding water. The delayed cold weathering accelerator for ordinary Portland cement, which is one kind of cement, is prepared by mixing 22 parts by weight of calcium nitrate, A first admixture composed of 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite and a second admixture composed of 1 part by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) and 3 parts by weight of calcium formate (CF) To 60 parts by weight of the compounding water.
The general cold weather accelerator for crude steel cement was prepared by mixing a first admixture composed of 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, 1 part by weight of potassium formate (PF), 2 parts by weight of potassium acetate And 4 parts by weight of potassium nitrate to 60 parts by weight of the compounding water. The delayed cold weathering accelerator for crude steel cement is prepared by mixing 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, A second admixture composed of an admixture, 3.5 parts by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) and 1.5 parts by weight of potassium nitrate, in 60 parts by weight of the compounding water.
The general weather resistance promoter for alumina cement was prepared by mixing a first admixture composed of 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, 2.5 parts by weight of potassium formate (PF), 2.5 parts by weight of potassium acetate (PA) 1 part by weight of tartaric acid and 1 part by weight of lithium carbonate was mixed with 60 parts by weight of the compounding water. The delayed cold weathering accelerator for alumina cement was prepared by mixing 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite And a second admixture composed of 2.5 parts by weight of potassium formate (PF), 2.5 parts by weight of potassium acetate (PA), 1.5 parts by weight of tartaric acid and 0.5 part by weight of lithium carbonate were mixed in 60 parts by weight of the compounding water .
The details of other embodiments are included in the detailed description.
The cold weather accelerator composition for exothermic concrete capable of exhibiting the early strength according to the present invention is prepared by mixing an admixture containing calcium nitrate, calcium nitrite and lithium nitrite in a mixed water and adjusting the setting time and the heating time according to the type of cement By weight of an additive which is blended at a ratio of 1: 1 to 1: 1.
In addition, the cold resisting accelerator composition for exothermic concrete capable of exhibiting the early strength according to the present invention can prevent the concrete from freezing by inducing an exothermic reaction at an early stage even at a subzero temperature, .
In addition, the cold weather accelerator composition for exothermic concrete capable of expressing the early strength according to the present invention can be obtained by casting the concrete using the cold accelerator having an optimum ratio according to the kind of cement, It is possible to maintain excellent toughness and workability.
It will be appreciated that embodiments of the technical idea of the present invention can provide various effects not specifically mentioned.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the maximum temperature and arrival time of a mortar prepared according to Examples and Comparative Examples of the present invention. FIG.
FIG. 2 is a graph showing the compressive strength with time of mortar prepared according to Examples and Comparative Examples of the present invention. FIG.
Advantages and features of the present invention, and methods of accomplishing the same, will be apparent from and elucidated with reference to the embodiments described hereinafter in detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.
Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.
Hereinafter, the cold weather accelerator composition for exothermic concrete capable of exhibiting the early strength according to the present invention will be described in detail.
The cold weather accelerator composition for exothermic concrete capable of exhibiting the early strength according to the present invention is prepared by mixing a first admixture containing calcium nitrate, calcium nitrite and lithium nitrite in the compounding water and mixing it with cement The second admixture blended at an optimum ratio is further added to produce a liquid weather resistance promoter. Accordingly, in application to cold-weather concrete, freezing of the concrete can be prevented by inducing an exothermic reaction at an initial temperature below zero, The compressive strength can be improved.
The cold weather accelerator composition for exothermic concrete capable of exhibiting the early strength according to the present invention comprises the compounding water, the first admixing agent and the second admixing agent.
The mixing water is used for mixing the first admixture and the second admixture, and it is preferable to use distilled water which is not limited to any kind but has no impurities and is purified cleanly.
In the present invention, the amount of the compounding water may be 55 to 65 parts by weight. When the amount of the compounding agent is less than 55 parts by weight, the mixing amount of the first and second admixing agents is too small, If the amount is more than 65 parts by weight, the amount of the compounding water to be used becomes excessively large, and the physical properties of the cold accelerating agent to be produced are deteriorated. Therefore, in the present invention, it is preferable that the compounding number is 55 to 65 parts by weight.
The first admixture is added to impart a flowability, and includes calcium nitrate, calcium nitrite, and lithium nitrite.
The calcium nitrate is Ca (NO 3 ) 2 as a raw material to be mixed with the concrete in order to enhance the early strength when casting concrete, and may be added in order to accelerate the curing speed of the mortar in a short time.
In the present invention, the calcium nitrate may be contained in an amount of 20 to 30 parts by weight. When the calcium nitrate is used in an amount of less than 20 parts by weight, the effect of shortening the coagulation time is small, If it is used in excess of the weight part, it may cause a delay of the condensation time rather than an excessive amount. Therefore, in the present invention, the calcium nitrate is preferably used in an amount of 20 to 30 parts by weight.
The calcium nitrite is Ca (NO 2 ) 2, which is chemically reacted with chlorides to prevent corrosion of reinforcing bars and the like and improve the workability and durability.
In the present invention, the calcium nitrite may be contained in an amount of 5 to 15 parts by weight. When the calcium nitrite is used in an amount of less than 5 parts by weight, the effect of the action is insignificant and the rebar can be corroded. The durability of the produced concrete may be decreased. In addition, when the above-mentioned amount of the nitrite is used in excess of 15 parts by weight, the concrete produced by adding the cold accelerator prepared according to the present invention may have a too high rate of congealing, resulting in poor workability and durability. Therefore, it is preferable that 5 to 15 parts by weight of the calcium nitrite is used in the present invention.
The lithium nitrite is LiNO 2 , and can be added to improve the initial cohesion strength. In the present invention, the lithium nitrite may be used in an amount of 2 to 10 parts by weight. When the lithium nitrite is used in an amount of less than 2 parts by weight, the effect of accelerating the curing is insignificant. When the lithium nitrite is used in an amount exceeding 10 parts by weight, And the strength of the concrete surface may be lowered. Therefore, it is preferable that the lithium nitrite is used in an amount of 2 to 10 parts by weight in the present invention.
The second admixture may be composed in a different composition depending on the type of cement used and may be added in an optimum ratio to control the setting time and heat generation time of the concrete.
1. Composition of ordinary portland cement which is one kind of cement
When the cement used in the present invention is ordinary Portland cement which is one kind of cement, the second admixture includes potassium formate (PF), potassium acetate (PA) and calcium formate (CF).
In the present invention, 1 to 15 parts by weight of the potassium formate is used, 1 to 15 parts by weight of the potassium acetate is used, and 0.1 to 10 parts by weight of the calcium formate is used.
In the present invention, the potassium formate (PF), the potassium acetate (PA) and the calcium formate (CF) have a very low freezing point and perform a condensation promoting function at a low temperature, so that they can be used as cold resistance accelerators. The effect of the freezing point can be imparted while the strength can be enhanced.
2. Composition of crude steel cement
The crude steel cement refers to portland cement which has higher heat generation than ordinary cement due to changed chemical composition, plasticity, and powderiness, and thus has a higher hardening and strength improvement rate.
When the cement used in the present invention is crude steel cement, the second admixture includes potassium formate (PF), potassium acetate (PA) and potassium nitrate. The potassium nitrate is added to the concrete It can act as a corrosion inhibitor for reinforced reinforcing bars.
In the present invention, 1 to 15 parts by weight of the potassium formate is used, 1 to 15 parts by weight of the potassium acetate is used, and 0.1 to 10 parts by weight of the potassium nitrate is used.
3. Composition of Alumina Cement
The alumina cement is a cement obtained by calcining a mixture of bauxite (Al 2 O 3 .H 2 O) with limestone (a rock composed mainly of CaCO 3 ). The alumina cement is excellent in rigidity and fire resistance and has a calorific value This means a lot of cement.
When the cement used in the present invention is alumina cement, the second admixture includes potassium formate (PF), potassium acetate (PA), tartaric acid and lithium carbonate. The tartaric acid is an organic acid having white crystals (Hydroxylic acid), which is also called tartaric acid, has the effect of slightly lowering the pH of the composition of the present invention due to the addition of tartaric acid, and imparts plasticity, flexibility, . In addition, the lithium carbonate may be added to maintain high early strength development and persistence of strength development.
In the present invention, 1 to 15 parts by weight of the potassium formate is used, 1 to 15 parts by weight of the potassium acetate is used, 0.1 to 5 parts by weight of the tartaric acid is used, and 0.1 to 5 parts by weight of the lithium carbonate is used.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of a cold weather accelerator composition for exothermic concrete capable of exhibiting early strength according to the technical idea of the present invention will be described in detail with reference to the accompanying drawings.
In the following examples according to the present invention, the blending ratio of the cold weather accelerator composition for exothermic concrete capable of expressing the early strength in consideration of the strength development, the setting time and the heat generation time is made differently, and the cold weather accelerator Were classified into general type or delayed type cold tolerant accelerator.
The cold weather accelerator compositions according to the respective cements were made to have different composition ratios as shown in the following to prepare cold weather accelerators according to the present invention.
1. For ordinary portland cement, a kind of cement
First, a first admixture composed of 23 parts by weight of calcium nitrate, 7.5 parts by weight of calcium nitrite and 5.5 parts by weight of lithium nitrite, 1.5 parts by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) And 0.5 part by weight were mixed with 60 parts by weight of the compounding water to prepare a general type cold weather accelerator for cement.
Next, a first admixture composed of 22 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, 1 part by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) ) Was mixed with 60 parts by weight of the compounding water to prepare a delayed cold weathering accelerator for cement.
2. Case of crude steel cement
First, a first admixture composed of 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, and 1 part by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) and 4 parts by weight of potassium nitrate The second admixture was mixed with 60 parts by weight of the compounding water to prepare a general cold weather accelerator for crude steel cement.
Next, a first admixture composed of 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, 3.5 parts by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) and 1.5 parts by weight of potassium nitrate And the second admixture constituted by the above components were mixed with 60 parts by weight of the compounding water to prepare a delayed cold weather accelerator for crude steel cement.
3. For alumina cement
First, a first admixture composed of 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, 2.5 parts by weight of potassium formate (PF), 2.5 parts by weight of potassium acetate (PA), 1 part by weight of tartaric acid, And 1 part by weight of a carbonate were mixed with 60 parts by weight of the compounding water to prepare a general cold weather accelerator for alumina cement.
Next, a first admixture composed of 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, 2.5 parts by weight of potassium formate (PF), 2.5 parts by weight of potassium acetate (PA) And a second admixture composed of 0.5 part by weight of lithium carbonate were mixed with 60 parts by weight of the compounding water to prepare a delayed cold weather accelerator for alumina cement.
Experiments were conducted to measure the temperature behavior at 0 ° C using the general-purpose and standard-type cold weather accelerators as described above.
1. Measurement of temperature behavior of ordinary portland cement, one kind of cement
≪ Example 1-1 >
A mortar containing a general cold weather accelerator prepared according to the present invention was prepared by adding 650 parts by weight of sand, 115 parts by weight of a mixture, 0.7 part by weight of a water reducing agent and 15 parts by weight of a general cold resistance promoter to 350 parts by weight of ordinary portland cement, .
≪ Example 1-2 >
By adding 650 parts by weight of sand, 115 parts by weight of a compounding agent, 0.7 part by weight of a water reducing agent and 15 parts by weight of a delayed cold weathering accelerator to 350 parts by weight of ordinary portland cement which is one kind of cement, Mortar.
≪ Comparative Example 1 &
A mortar according to Comparative Example 1 was prepared by mixing 650 parts by weight of sand, 130 parts by weight of a blending agent and 0.7 parts by weight of a water reducing agent into 350 parts by weight of ordinary portland cement which is one kind of cement.
2. Measurement of temperature behavior of crude steel cement
≪ Example 2-1 >
A mortar containing the general cold resistance promoter prepared according to the present invention was prepared by adding 650 parts by weight of sand, 115 parts by weight of a sand, 0.7 part by weight of a water reducing agent and 15 parts by weight of a general cold resistance promoter to 350 parts by weight of crude steel cement.
≪ Example 2-2 >
A mortar containing the delayed cold weather accelerator prepared according to the present invention was prepared by mixing 650 parts by weight of sand, 115 parts by weight of the mixture, 0.7 part by weight of a water reducing agent and 15 parts by weight of a delayed cold weather accelerator, in 350 parts by weight of crude steel cement.
≪ Comparative Example 2 &
650 parts by weight of sand, 130 parts by weight of compounding agent and 0.7 part by weight of water reducing agent were mixed in 350 parts by weight of crude steel cement to prepare a mortar according to Comparative Example 2.
3. Measurement of temperature behavior of alumina cement
≪ Example 3-1 >
By mixing 650 parts by weight of sand, 115 parts by weight of a mixture, 0.7 parts by weight of a water reducing agent and 15 parts by weight of a general cold resistance promoter in a mixed cement of 280 parts by weight of ordinary portland cement as one kind of cement and 70 parts by weight of alumina cement, A mortar containing a general cold resistance promoter was prepared.
≪ Example 3-2 >
By mixing 650 parts by weight of sand, 115 parts by weight of a mixture, 0.7 part by weight of a water reducing agent and 15 parts by weight of a delayed cold weathering accelerator in a mixed cement of 280 parts by weight of ordinary portland cement as one kind of cement and 70 parts by weight of alumina cement, Mortar containing the general cold resistance promoter.
≪ Comparative Example 3 &
A mortar according to Comparative Example 3 was prepared by mixing 650 parts by weight of sand, 130 parts by weight of a blending agent and 0.7 parts by weight of a water reducing agent into a mixed cement of 280 parts by weight of ordinary portland cement as one kind of cement and 70 parts by weight of alumina cement.
The results of the measurement of the temperature behavior at 0 캜 of the mortar prepared according to the examples and the comparative examples are shown in the following Table 1 and FIG. 1 and FIG. 2.
Referring to Table 1 and FIG. 1 and FIG. 2, it can be seen that the mortar prepared by adding the cold resistance promoter according to the embodiment of the present invention has a higher initial heating temperature than the mortar prepared according to the comparative example , And the initial compressive strength is increased.
In addition, it can be seen that the retarding cold weather accelerating agent produced according to the present invention has an increased temperature rise time and an increased compressive strength, as compared with the case where mortar is produced using a general cold resistant accelerator.
Therefore, as in the present invention, an admixture containing calcium nitrate, calcium nitrite and lithium nitrite is mixed with the compounding water and an admixture compounded in an optimal ratio according to the type of cement is added to control the setting time and the heating time, It is possible to prevent the concrete from freezing by inducing an exothermic reaction initially at a subzero temperature and to improve the initial compressive strength.
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that one embodiment described above is illustrative in all aspects and not restrictive.
Claims (7)
(PF), potassium acetate (PA), calcium formate (CF), potassium nitrate, tartaric acid, and lithium carbonate, which are added to control the setting time and the heating time of the concrete. A second admixture comprising; And
And a mixed water used for mixing the first admixture and the second admixture,
When the cold accelerator is blended with common portland cement, which is one kind of cement,
Wherein the first admixture comprises 20 to 30 parts by weight of calcium nitrate, 5 to 15 parts by weight of calcium nitrite, and 2 to 10 parts by weight of lithium nitrite,
Wherein the second admixture is selected from the group consisting of potassium formate, potassium acetate and calcium formate,
1 to 15 parts by weight of the potassium formate, 1 to 15 parts by weight of the potassium acetate, and 0.1 to 10 parts by weight of the calcium formate are used,
Wherein the composition is used in an amount of 55 to 65 parts by weight.
(PF), potassium acetate (PA), calcium formate (CF), potassium nitrate, tartaric acid, and lithium carbonate, which are added to control the setting time and the heating time of the concrete. A second admixture comprising; And
And a mixed water used for mixing the first admixture and the second admixture,
When the cold accelerator is blended with crude steel cement,
Wherein the first admixture comprises 20 to 30 parts by weight of calcium nitrate, 5 to 15 parts by weight of calcium nitrite, and 2 to 10 parts by weight of lithium nitrite,
Wherein the second admixture is potassium formate, potassium acetate and potassium nitrate,
1 to 15 parts by weight of the potassium formate, 1 to 15 parts by weight of the potassium acetate, and 0.1 to 10 parts by weight of the potassium nitrate are used,
Wherein the composition is used in an amount of 55 to 65 parts by weight.
(PF), potassium acetate (PA), calcium formate (CF), potassium nitrate, tartaric acid, and lithium carbonate, which are added to control the setting time and the heating time of the concrete. A second admixture comprising; And
And a mixed water used for mixing the first admixture and the second admixture,
When the cold accelerator is blended with alumina cement,
Wherein the first admixture comprises 20 to 30 parts by weight of calcium nitrate, 5 to 15 parts by weight of calcium nitrite, and 2 to 10 parts by weight of lithium nitrite,
Wherein the second admixture is selected from the group consisting of potassium formate, potassium acetate, tartaric acid, and lithium carbonate,
1 to 15 parts by weight of the potassium formate, 1 to 15 parts by weight of the potassium acetate, 0.1 to 5 parts by weight of the tartaric acid, and 0.1 to 5 parts by weight of the lithium carbonate,
Wherein the composition is used in an amount of 55 to 65 parts by weight.
Typical cold weather accelerators for ordinary portland cement, which is one kind of cement,
A first admixture composed of 23 parts by weight of calcium nitrate, 7.5 parts by weight of calcium nitrite and 5.5 parts by weight of lithium nitrite, 1.5 parts by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) and 0.5 part by weight of calcium formate To 60 parts by weight of the compounding water,
The delayed cold weather accelerator for ordinary portland cement, which is one kind of cement,
22 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, and 1 part by weight of potassium formate By weight of a second admixture composed of a polybutylene terephthalate resin and a polypropylene resin.
As a general cold weather accelerator for crude steel cement,
A first admixture composed of 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite and a second admixture composed of 1 part by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) and 4 parts by weight of potassium nitrate And mixing the admixture with 60 parts by weight of the compounding water,
The delayed cold weather accelerator for crude steel cement,
A second admixture composed of 21 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, 3.5 parts by weight of potassium formate (PF), 2 parts by weight of potassium acetate (PA) and 1.5 parts by weight of potassium nitrate And mixing the admixture with 60 parts by weight of the compounding water.
As a general cold weather accelerator for alumina cement,
, 2.5 parts by weight of potassium formate (PF), 2.5 parts by weight of potassium acetate (PA), 1 part by weight of tartaric acid, and 1 part by weight of lithium carbonate 1 By weight of a second admixture composed of 100 parts by weight of a polypropylene resin,
The delayed cold weather accelerators for alumina cement are,
, 2.5 parts by weight of potassium formate (PF), 2.5 parts by weight of potassium acetate (PA), 1.5 parts by weight of tartaric acid and 0.5 part by weight of lithium carbonate 0.5 parts by weight of calcium nitrate, 7 parts by weight of calcium nitrite and 5 parts by weight of lithium nitrite, By weight of a second admixture constituted by 100 parts by weight of a polypropylene resin and 60 parts by weight of a compounding water.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101973967B1 (en) | 2017-10-31 | 2019-04-30 | 주식회사 지안산업 | An inorganic binder composition capable of improving initial strength and preventing initial frost resistance |
| KR20190048989A (en) | 2017-10-31 | 2019-05-09 | 주식회사 지안산업 | Rapid hardening inorganic binder using Self-heating circulating fluidized bed boiler bottom ash |
| KR101977148B1 (en) | 2018-10-25 | 2019-05-10 | 두산건설 주식회사 | Accelerator for Anti-freezing Concrete, High Early Strength Concrete Composition Using the Accelerator and Construction Method of the Concrete |
| KR20190136657A (en) | 2018-05-31 | 2019-12-10 | 주식회사 지안산업 | Inorganic binder composition capable of promoting heat generation and resistance to cold |
| KR20210071458A (en) | 2019-12-06 | 2021-06-16 | 주식회사 대웅 | Weak foundation treatment method |
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| CN109592925B (en) * | 2019-01-11 | 2021-09-07 | 深鹏环保工程有限公司 | Anti-freezing and thawing additive for construction waste wallboard and preparation method thereof |
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| CN103496907A (en) * | 2013-09-29 | 2014-01-08 | 张家港市山牧新材料技术开发有限公司 | Ultralow-temperature anti-freezing concrete and preparation method thereof |
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| KR100307147B1 (en) | 1999-08-27 | 2001-09-13 | 민광식 | The Water-permeable Cement Concrete Composition having Remelting-resistance |
| CN101198567A (en) | 2005-06-14 | 2008-06-11 | 建筑研究及技术有限责任公司 | Method of delivery of agents providing freezing and thawing resistance to cementitious compositions |
| KR101506168B1 (en) | 2013-09-09 | 2015-03-26 | 유한회사 콘원 | Surface treatment agent of Concrete for preventing freezing and melting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103496907A (en) * | 2013-09-29 | 2014-01-08 | 张家港市山牧新材料技术开发有限公司 | Ultralow-temperature anti-freezing concrete and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101973967B1 (en) | 2017-10-31 | 2019-04-30 | 주식회사 지안산업 | An inorganic binder composition capable of improving initial strength and preventing initial frost resistance |
| KR20190048989A (en) | 2017-10-31 | 2019-05-09 | 주식회사 지안산업 | Rapid hardening inorganic binder using Self-heating circulating fluidized bed boiler bottom ash |
| KR20190136657A (en) | 2018-05-31 | 2019-12-10 | 주식회사 지안산업 | Inorganic binder composition capable of promoting heat generation and resistance to cold |
| KR101977148B1 (en) | 2018-10-25 | 2019-05-10 | 두산건설 주식회사 | Accelerator for Anti-freezing Concrete, High Early Strength Concrete Composition Using the Accelerator and Construction Method of the Concrete |
| KR20210071458A (en) | 2019-12-06 | 2021-06-16 | 주식회사 대웅 | Weak foundation treatment method |
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