CN113526898A - Concrete antifreezing agent and preparation method and application thereof - Google Patents
Concrete antifreezing agent and preparation method and application thereof Download PDFInfo
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- CN113526898A CN113526898A CN202110870364.5A CN202110870364A CN113526898A CN 113526898 A CN113526898 A CN 113526898A CN 202110870364 A CN202110870364 A CN 202110870364A CN 113526898 A CN113526898 A CN 113526898A
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- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 73
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000013078 crystal Substances 0.000 claims abstract description 38
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 27
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 27
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 27
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 24
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 24
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 21
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 21
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000001110 calcium chloride Substances 0.000 claims abstract description 21
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 21
- 239000002270 dispersing agent Substances 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 36
- 230000002528 anti-freeze Effects 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000000378 calcium silicate Substances 0.000 claims description 2
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 abstract description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 6
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 abstract description 6
- 238000007710 freezing Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 15
- 238000003756 stirring Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 208000005623 Carcinogenesis Diseases 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 230000036952 cancer formation Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 231100000504 carcinogenesis Toxicity 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/601—Agents for increasing frost resistance
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a concrete antifreezing agent, which comprises glycerol, triethanolamine, sodium sulfate, sodium dodecyl sulfate, calcium chloride, a water reducing agent, water and a nano seed crystal early strength agent, wherein the nano seed crystal early strength agent comprises 10-15 wt% of calcium nitrate, 20-25 wt% of sodium silicate and an optional dispersing agent and/or comprises a reaction product of 10-15 wt% of calcium nitrate, 20-25 wt% of sodium silicate and an optional dispersing agent, wherein the mass of the nano seed crystal early strength agent is 100%. The invention also discloses a preparation method of the concrete antifreezing agent and application of the concrete antifreezing agent in concrete engineering. The antifreezing agent disclosed by the invention does not need nitrate and nitrite components, has the advantages of safety and environmental protection, improves the durability of concrete, can improve the hardening speed of the concrete while preventing freezing, and further reduces the frost heaving risk.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete antifreezing agent as well as a preparation method and application thereof.
Background
In winter and high latitude and high altitude areas, because the air temperature is lower, the problems of slow strength increase, slow hydration or stop generally occur in the construction process of common concrete, and some places even can have frost heaving to cause the breakage of the concrete, thereby further reducing the strength of the concrete. In order to solve this problem, anti-freezing agents are often used to improve the anti-freezing performance of concrete during construction.
At present, the components of concrete antifreezes are nitrite, nitrate, urea and the like. However, the existence of nitrate and nitrite easily causes alkali aggregate reaction and has carcinogenic effect, and simultaneously, the corrosion can be generated on reinforcing steel bars, and the service life and the quality of buildings are influenced.
Therefore, the development of a safe and environment-friendly concrete antifreezing agent with excellent concrete antifreezing performance has important significance.
Disclosure of Invention
Based on the problems in the prior art, the invention mainly aims to provide a safe and environment-friendly concrete antifreezing agent with excellent concrete antifreezing performance, which does not need to adopt nitrate and nitrite, improves the durability of concrete, improves the hardening speed of concrete and further reduces the frost heaving risk.
Therefore, the invention provides a concrete antifreezing agent in a first aspect, which comprises glycerol, triethanolamine, sodium sulfate, sodium dodecyl sulfate, calcium chloride, a water reducing agent, water and a nano seed crystal early strength agent; the nano seed crystal early strength agent comprises 10-15 wt% of calcium nitrate, 20-25 wt% of sodium silicate and an optional dispersing agent, wherein the mass of the nano seed crystal early strength agent is 100%.
According to some embodiments of the present invention, the nano-seed early strength agent comprises the reaction product of 10 wt% to 15 wt% calcium nitrate, 20 wt% to 25 wt% sodium silicate, and an optional dispersant.
According to some embodiments of the invention, the concrete antifreeze comprises the following components in parts by weight: 10-20 parts of glycerol, 3-25 parts of triethanolamine, 3-10 parts of sodium sulfate, 15-25 parts of sodium dodecyl sulfate, 9-17 parts of calcium chloride, 5-40 parts of a water reducing agent, 10-45 parts of water and 5-20 parts of a nano seed crystal early strength agent.
According to some embodiments of the invention, the concrete antifreeze comprises the following components in parts by weight: 15-20 parts of glycerol, 15-25 parts of triethanolamine, 6-10 parts of sodium sulfate, 15-20 parts of sodium dodecyl sulfate, 9-15 parts of calcium chloride, 20-35 parts of a water reducing agent, 25-40 parts of water and 5-15 parts of a nano seed crystal early strength agent.
According to some embodiments of the invention, the water reducing agent is sodium lignosulfonate.
According to some embodiments of the present invention, the nano seed crystal early strength agent comprises 10 wt% to 15 wt% of calcium nitrate, 20 wt% to 25 wt% of sodium silicate, and 30 wt% to 35 wt% of a dispersant and/or a reaction product comprising 10 wt% to 15 wt% of calcium nitrate, 20 wt% to 25 wt% of sodium silicate, and 30 wt% to 35 wt% of a dispersant, based on 100% by mass of the nano seed crystal early strength agent.
According to some embodiments of the present invention, the nano-seed crystal early strength agent comprises calcium nitrate with a mass concentration of 12% to 14%, and in some embodiments, comprises calcium nitrate with a mass concentration of 12%, based on 100% by mass of the nano-seed crystal early strength agent.
According to some embodiments of the present invention, the nano-seed crystal early strength agent comprises sodium silicate with a mass concentration of 22% to 24%, and in some embodiments, 23%, based on 100% by mass of the nano-seed crystal early strength agent.
According to some embodiments of the invention, the dispersant is selected from at least one of polyethylene glycol, sodium dodecylbenzene sulfonate, and fatty acid polyoxyethylene ether;
according to some embodiments of the present invention, the nano-seed early strength agent is prepared by a method comprising the following steps:
1) mixing calcium nitrate, sodium silicate and a water solution of a dispersing agent to obtain a mixed solution;
2) adjusting the pH value of the obtained mixed solution to 9-10 to obtain the nano seed crystal early strength agent;
according to some embodiments of the invention, step 1) is carried out at a temperature of 25-35 ℃.
According to some embodiments of the invention, the time of mixing in step (1) is 0.5 to 1.5 h.
According to some embodiments of the present invention, in step 1), calcium nitrate and sodium silicate are added dropwise in the form of a solution to an aqueous solution of a dispersant, and mixed to obtain a mixed solution, preferably, the dropwise addition time is 1-2 hours. The solution form means that a solution is formed by dissolving calcium silicate and sodium silicate in a solvent capable of dissolving the sodium silicate and the sodium silicate, for example, an aqueous solution of calcium nitrate and sodium silicate.
According to some embodiments of the present invention, in step 1), the sodium silicate solution is added dropwise to the dispersant for 1 hour more than the calcium nitrate solution.
In a second aspect, the present invention provides a method for preparing a concrete antifreezer according to the first aspect of the present invention, comprising the steps of:
(1) mixing triethanolamine, sodium sulfate, glycerol, sodium dodecyl sulfate, calcium chloride and water for the first time to obtain a mixture;
(2) and (2) carrying out second mixing on the first mixture obtained in the step (1), a water reducing agent and a nano seed crystal early strength agent to obtain the concrete antifreezing agent.
According to some embodiments of the invention, the temperature of the first mixing is 50-60 ℃.
According to some embodiments of the invention, the temperature of the second mixing is 20-30 ℃.
According to some embodiments of the invention, the time of the first mixing is 30-90min, preferably 50-70 min. In some embodiments, the time for the first mixing is 60 min.
According to some embodiments of the invention, the time of the second mixing is 30-90min, preferably 40-60 min. In some embodiments, the time for the second mixing is 50 min.
In a third aspect, the invention provides a concrete antifreezer according to the first aspect of the invention or a concrete antifreezer prepared by the preparation method according to the second aspect of the invention, and the application of the concrete antifreezer in concrete engineering, in particular concrete engineering at a temperature of between-5 and-20 ℃.
Compared with the prior art, the invention has the advantages that:
(1) the concrete antifreezing agent disclosed by the invention does not need to use nitrate and nitrite, avoids the defects of easy alkali-aggregate reaction, carcinogenesis, corrosion on reinforcing steel bars and influence on the service life and quality of buildings caused by using nitrate and nitrite in the prior art, and has the advantages of safety and environmental friendliness.
(2) The concrete antifreezing agent provided by the invention can improve the durability of concrete, improve the hardening speed of the concrete while preventing freezing, and further reduce the frost heaving risk.
Detailed Description
In order that the invention may be more readily understood, the following detailed description of the invention is given in conjunction with the examples which are given for purposes of illustration only and are not to be construed as limiting the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents, instruments or materials used are not indicated by the manufacturer, and are conventional products which are commercially available or obtainable by known production methods.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The preparation method of the nano seed crystal early strength agent used in the following examples comprises the following steps: under the condition that the temperature is 30 ℃, a calcium nitrate solution and a sodium silicate solution are respectively dripped into an aqueous solution of a dispersing agent (sodium dodecyl benzene sulfonate) for 2 hours and 3 hours, wherein the mass content of the calcium nitrate is 30%, the mass content of the sodium silicate is 25% and the mass content of the dispersing agent is 32% based on the total mass of the raw materials. Fully stirring, reacting for 1h after the dropwise addition is finished, and adjusting the pH value to 9-10 to obtain the required nano seed crystal early strength agent.
Example 1
The concrete antifreezing agent consists of the following components in percentage by mass: 15 parts of glycerol, 18 parts of triethanolamine, 8 parts of sodium sulfate, 18 parts of sodium dodecyl sulfate, 10 parts of calcium chloride, 15 parts of water, 10 parts of sodium lignosulfonate and 6 parts of nano seed crystal early strength agent.
The concrete antifreezing agent is prepared by the following specific steps: mixing triethanolamine, sodium sulfate, glycerol, sodium sulfate, sodium dodecyl sulfate, calcium chloride and water, heating to 55 ℃, stirring for 1 hour, cooling to room temperature after uniform mixing, and fully mixing with a water reducing agent and a nano seed crystal early strength agent for 50min to obtain the concrete antifreezing agent.
According to the standard test of JC475-2004 'concrete antifreezer' and the water reducing rate of 13 percent under the environment of-15 ℃, R-7Compressive strength ratio 14%, R28Compressive Strength ratio of 122%, R-7+28The compressive strength ratio is 106 percent, and other indexes meet the requirements.
Example 2
The concrete antifreezing agent consists of the following components in percentage by mass: 15 parts of glycerol, 18 parts of triethanolamine, 9 parts of sodium sulfate, 15 parts of sodium dodecyl sulfate, 9 parts of calcium chloride, 15 parts of water, 14 parts of sodium lignosulfonate and 5 parts of nano seed crystal early strength agent.
The concrete antifreezing agent is prepared by the following specific steps:
mixing triethanolamine, sodium sulfate, ethylene glycol, sodium sulfate, sodium dodecyl sulfate, calcium chloride and water, heating to 55 ℃, stirring for 1 hour, cooling to room temperature after uniform mixing, and then fully mixing with a water reducing agent and a nano seed crystal early strength agent for 50min to obtain the concrete antifreezing agent.
According to the standard test of JC475-2004 'concrete antifreezer' and under the environment of-15 ℃, the water reduction rate is 14 percent and R is-7Compressive strength ratio 15%, R28Compressive strength ratio of 125%, R-7+28The compressive strength ratio is 105 percent, and other indexes meet the requirements.
Example 3
The concrete antifreezing agent consists of the following components in percentage by mass: 18 parts of glycerol, 3 parts of triethanolamine, 3 parts of sodium sulfate, 16 parts of sodium dodecyl sulfate, 9 parts of calcium chloride, 10 parts of sodium lignosulfonate, 20 parts of a nano seed crystal early strength agent and 25 parts of water.
The concrete antifreezing agent is prepared by the following specific steps:
mixing triethanolamine, sodium sulfate, ethylene glycol, sodium sulfate, sodium dodecyl sulfate, calcium chloride and water, heating to 55 ℃, stirring for 1 hour, cooling to room temperature after uniform mixing, and then fully mixing with a water reducing agent and a nano seed crystal early strength agent for 50min to obtain the concrete antifreezing agent.
According to the standard test of JC475-2004 'concrete antifreezer' and the water reducing rate of 10 percent under the environment of-15 ℃, R-7Compressive strength ratio of 16%, R28Compressive strength ratio of 110%, R-7+28The compressive strength ratio is 100 percent, and other indexes meet the requirements.
Example 4
The concrete antifreezing agent consists of the following components in percentage by mass: 15 parts of glycerol, 4 parts of triethanolamine, 4 parts of sodium sulfate, 15 parts of sodium dodecyl sulfate, 10 parts of calcium chloride, 35 parts of sodium lignosulfonate, 10 parts of a nano seed crystal early strength agent and 30 parts of water.
The concrete antifreezing agent is prepared by the following specific steps:
mixing triethanolamine, sodium sulfate, ethylene glycol, sodium sulfate, sodium dodecyl sulfate, calcium chloride and water, heating to 55 ℃, stirring for 1 hour, cooling to room temperature after uniform mixing, and then fully mixing with a water reducing agent and a nano seed crystal early strength agent for 50min to obtain the concrete antifreezing agent.
According to the standard test of JC475-2004 'concrete antifreezer' and the water reducing rate of 16 percent and the R percent under the environment of-15 DEG C-7Compressive strength ratio 14%, R28Compressive Strength ratio of 115%, R-7+28The compressive strength ratio is 105 percent, and other indexes meet the requirements.
Comparative example 1
The concrete antifreezing agent consists of the following components in percentage by mass: 15 parts of glycerol, 18 parts of triethanolamine, 8 parts of sodium sulfate, 18 parts of sodium dodecyl sulfate, 10 parts of calcium chloride, 10 parts of sodium lignosulfonate and the balance of water.
The preparation method of the concrete antifreezing agent comprises the following steps: mixing triethanolamine, sodium sulfate, ethylene glycol, sodium sulfate, sodium dodecyl sulfate, calcium chloride and water, heating to 55 ℃, stirring for 1 hour, cooling to room temperature after uniform mixing, and fully mixing with a water reducing agent for 50min to obtain the concrete antifreezing agent.
According to the standard test of JC475-2004 'concrete antifreezer' and the water reducing rate of 8 percent under the environment of-15 ℃, R-7Compressive strength ratio of 10%, R28Compressive strength ratio 90%, R-7+28The compressive strength ratio is 95 percent, and other indexes meet the requirements.
Comparative example 2
The concrete antifreezing agent consists of the following components in percentage by mass: 15 parts of glycerol, 18 parts of triethanolamine, 8 parts of sodium sulfate, 18 parts of sodium dodecyl sulfate, 10 parts of calcium chloride, 6 parts of a nano seed crystal early strength agent and the balance of water.
The preparation method of the concrete antifreezing agent comprises the following steps: mixing triethanolamine, sodium sulfate, ethylene glycol, sodium sulfate, sodium dodecyl sulfate, calcium chloride and water, heating to 55 ℃, stirring for 1 hour, cooling to room temperature after uniform mixing, and fully mixing with a water reducing agent to obtain the concrete antifreezing agent.
According to the standard test of JC475-2004 'concrete antifreezer' and under the environment of-15 ℃, the water reduction rate is 6 percent and R is-7Compressive strength ratio 14%, R28Compressive strength ratio 95%, R-7+28The compressive strength ratio is 106 percent, and other indexes meet the requirements.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not set any limit to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. The concrete antifreezing agent comprises glycerol, triethanolamine, sodium sulfate, sodium dodecyl sulfate, calcium chloride, a water reducing agent, water and a nano seed crystal early strength agent, wherein the nano seed crystal early strength agent comprises 10-15 wt% of calcium nitrate, 20-25 wt% of sodium silicate and an optional dispersing agent and/or comprises a reaction product of 10-15 wt% of calcium nitrate, 20-25 wt% of sodium silicate and an optional dispersing agent, wherein the mass of the nano seed crystal early strength agent is 100%.
2. The concrete antifreeze according to claim 1, wherein the concrete antifreeze comprises the following components in parts by weight: 10-20 parts of glycerol, 3-25 parts of triethanolamine, 3-10 parts of sodium sulfate, 15-25 parts of sodium dodecyl sulfate, 9-17 parts of calcium chloride, 5-40 parts of a water reducing agent, 10-45 parts of water and 5-20 parts of a nano seed crystal early strength agent.
3. The concrete antifreeze according to claim 1 or 2, wherein the concrete antifreeze comprises the following components in parts by weight: 15-20 parts of glycerol, 15-25 parts of triethanolamine, 6-10 parts of sodium sulfate, 15-20 parts of sodium dodecyl sulfate, 9-15 parts of calcium chloride, 20-35 parts of a water reducing agent, 25-40 parts of water and 5-15 parts of a nano seed crystal early strength agent.
4. The concrete antifreeze of any one of claims 1 to 3, wherein said water reducing agent is sodium lignosulfonate.
5. The concrete antifreeze of any one of claims 1 to 4, wherein the nano seed crystal early strength agent comprises 10 to 15 wt% of calcium nitrate, 20 to 25 wt% of sodium silicate and 30 to 35 wt% of a dispersant and/or comprises the reaction product of 10 to 15 wt% of calcium nitrate, 20 to 25 wt% of sodium silicate and 30 to 35 wt% of a dispersant, based on 100% by mass of the nano seed crystal early strength agent,
preferably, the nano seed crystal early strength agent comprises 12 wt% of calcium nitrate, 23 wt% of sodium silicate and 30 wt% to 35 wt% of a dispersant and/or comprises a reaction product of 12 wt% of calcium nitrate, 23 wt% of sodium silicate and 30 wt% to 35 wt% of a dispersant;
more preferably, the dispersant is at least one selected from the group consisting of polyethylene glycol, sodium dodecylbenzenesulfonate and fatty acid polyoxyethylene ether.
6. The concrete antifreeze of any one of claims 1 to 5, wherein the nano seed crystal early strength agent is prepared by a method comprising the following steps:
1) mixing calcium nitrate, sodium silicate and a water solution of a dispersing agent to obtain a mixed solution;
2) adjusting the pH value of the obtained mixed solution to 9-10 to obtain the nano seed crystal early strength agent;
preferably, step 1) is carried out at a temperature of 25-35 ℃ and/or the mixing time in step (1) is 0.5-1.5 h;
more preferably, in step 1), calcium silicate and sodium silicate are added dropwise to the aqueous solution of the dispersant in the form of a solution and mixed to obtain a mixed solution, and the dropwise addition time is preferably 1 to 2 hours.
7. The method for producing the concrete antifreezer as defined in any one of claims 1 to 6, comprising the steps of:
(1) mixing triethanolamine, sodium sulfate, glycerol, sodium dodecyl sulfate, calcium chloride and water for the first time to obtain a mixture;
(2) and (2) carrying out second mixing on the mixture obtained in the step (1), a water reducing agent and a nano seed crystal early strength agent to obtain the concrete antifreezing agent.
8. The method of claim 7, wherein the temperature of the first mixing is 50-60 ℃ and/or the temperature of the second mixing is 20-30 ℃.
9. The method of claim 7 or 8, wherein the first mixing is performed for a period of 30-90min, preferably 50-70min, and/or the second mixing is performed for a period of 30-90min, preferably 40-60 min.
10. Use of the concrete antifreezes as claimed in any of claims 1 to 6 or of the concrete antifreezes produced by the process as claimed in any of claims 7 to 9 in concrete works, in particular at temperatures of from-5 to-20 ℃.
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Application publication date: 20211022 |