CN109231866B - Hydration heat inhibition type concrete expanding agent and preparation method thereof - Google Patents
Hydration heat inhibition type concrete expanding agent and preparation method thereof Download PDFInfo
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- CN109231866B CN109231866B CN201811190403.1A CN201811190403A CN109231866B CN 109231866 B CN109231866 B CN 109231866B CN 201811190403 A CN201811190403 A CN 201811190403A CN 109231866 B CN109231866 B CN 109231866B
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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
- 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
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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
-
- 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
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a hydration heat inhibited concrete expanding agent and a preparation method thereof, wherein the hydration heat inhibited concrete expanding agent is formed by compounding hydration heat inhibited expansion clinker and gypsum, wherein the hydration heat inhibited expansion clinker is prepared from the following raw materials in parts by weight: 50-70 parts of limestone, 5-15 parts of gypsum, 2-5 parts of iron slag, 10-20 parts of bauxite and 0.1-3.0 parts of metal ions or metal oxides, and is prepared by adopting an ion doping technology and firing at a high temperature. The preparation method is simple and easy to implement, and can effectively reduce the calcination temperature of the expanding agent clinker.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a hydration heat inhibited concrete expanding agent and a preparation method thereof.
Background
The concrete strength of the modern concrete is developed faster due to the fact that the used cement is thinner and thinner, and concrete cracks which can only occur to large-volume concrete appear in various engineering projects. The shrinkage of concrete, particularly the drying shrinkage and the temperature shrinkage, are a large main reason for causing early cracking deformation of concrete, so that the effective control of the early cracking problem of concrete is considered from the aspects of reducing the shrinkage and the hydration heat release.
Chinese patent No. CN201110053668.9 relates to an expanded clinker, which is prepared by mixing and calcining limestone and iron powder as raw materials, wherein: in the raw materials, the content of calcium carbonate is calculated by the content of CaO: 48-53 wt%; the content of Fe2O3 is as follows: 1-5 wt.%, each weight percent being based on the total weight of limestone and iron powder. The invention also relates to an expanding agent comprising the expanding clinker and a method for preparing the expanding clinker. The invention also relates to an expanding agent, which comprises the expanding clinker or the expanding agent. The expansion clinker has fast early hydration and difficult control of hydration temperature rise.
Chinese patent No. CN201410699473.5 provides an expanding agent for concrete, which comprises 30 to 55 parts by weight of expanding clinker, wherein the expanding clinker comprises calcium oxide expanding clinker, calcium sulphoaluminate expanding clinker or calcium oxide-calcium sulphoaluminate expanding clinker; 10-20 parts of gypsum; 5-15 parts of coal gangue; 30 to 60 portions of solid sulfur ash. The invention provides a preparation method of an expanding agent for concrete, which comprises the following steps: crushing and then mixing and grinding the expansion clinker, the gypsum, the coal gangue and the solid sulfur ash to obtain an expansion agent for concrete; the mass ratio of the expanded clinker to the gypsum to the coal gangue to the solid sulfur ash is (30-55) to (10-20) to (5-15) to (30-60). In the invention, the expansion clinker, the coal gangue and the solid sulfur ash are used as donors of an expansion source, so that the expanding agent provided by the invention has better expansion performance and further has better anti-cracking and waterproof performance. The expanding agent has short expansion stability period, and is not beneficial to inhibiting the concrete cracking in the later period.
In engineering, a certain amount of expanding agent is generally added to compensate self shrinkage and drying shrinkage of concrete, the existing expanding agent commonly used in China is still a calcium expanding agent, but the calcium expanding agent is quick in early hydration, quick in heat release and not beneficial to controlling hydration temperature rise, so that a hydration heat inhibition type expanding agent which is large in early expansion energy, long in expansion stabilizing period and capable of inhibiting hydration temperature rise is urgently needed to be prepared to solve the problems.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a hydration heat inhibition type concrete expanding agent and a preparation method thereof, wherein the hydration temperature peak of the net slurry of the fired expanded clinker is obviously reduced by adding metal ions or metal oxides, and the cement hydration inhibition agent has a certain delay and an obvious effect; the hydration heat inhibition type expansion clinker is obtained by adopting an ion doping technology and high-temperature firing, the preparation method is simple and easy to implement, and the calcination temperature of the expansion agent clinker can be effectively reduced.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a hydration heat inhibited concrete expanding agent which comprises, by weight, 45-85 wt% of hydration heat inhibited expanding clinker and 15-55 wt% of gypsum.
After the metal ions or the metal oxides are added, the net slurry hydration temperature peak of the fired expansion clinker is obviously reduced and delayed to a certain degree, and the addition of the metal ions or the metal oxides has an obvious effect on inhibiting the hydration of the cement.
The specific surface area of the hydration heat inhibited type expansion clinker is more than or equal to 200m2/kg。
The main mineral composition of the hydration heat inhibited expansion clinker is as follows: 30-50 wt% of free calcium oxide (f-CaO) and anhydrous calcium sulfoaluminate
20 to 40% by weight of dicalcium silicate (C)2S)3 to 15 wt.% and an iron phase (C)4AF)3 to 10 wt%.
In the hydration heat inhibited type expansion clinker, the content of CaO is 50 to 65 weight percent, and Fe2O3The content of (A) is 1 wt% -5 wt%, Al2O3Is 10 wt% -20 wt%, SO3The content of (A) is 5 wt% -15%, SiO2The content of (A) is 3 wt% -10 wt%.
The hydration heat inhibited type expansion clinker is prepared from the following raw materials in parts by weight: 50-70 parts of limestone, 5-15 parts of gypsum, 2-5 parts of iron slag, 10-20 parts of bauxite and 0.1-3.0 parts of metal ions or metal oxides.
Compared with the common expansion clinker, the hydration heat inhibited expansion clinker has the advantages that the initial setting time and the final setting time are prolonged to a certain degree, but the compressive strength and the expansion rate of the concrete are not adversely affected.
In the hydration heat inhibited type expansion clinker raw material, the content of calcium carbonate is 45-55 wt% calculated by the content of CaO, and the content of calcium sulfate is SO3The content of (B) is 3-15 wt%, and the content of iron is Fe2O3The content of (A) is 1 to 5 wt%, and the content of aluminum is Al2O3The content of (B) is 5 wt% -20 wt% based on the total mass of the raw materials.
The doped metal ions are Cu, Zn, Ba, Mg, Ti, Cr, Ga, V, Mn, Co, Ni, Sn, Pb and corresponding metal oxides.
The invention relates to a preparation method of a hydration heat inhibited concrete expanding agent, which comprises the following steps:
(1) mixing the raw materials for preparing the hydration heat inhibition type expansion clinker, crushing and grinding the raw materials, and sieving the mixture by a 200-mesh sieve to obtain a sieve residue of less than or equal to 1.5 percent;
(2) calcining the mixture at 1150-1350 ℃ for 15-60 min, and naturally cooling to obtain hydration heat inhibition type expanded clinker;
(3) mixing and grinding the hydration heat inhibition type expansion clinker and gypsum, sieving with a 200-mesh sieve to obtain the hydration heat inhibition type concrete expansion agent, wherein the sieve residue is less than or equal to 12%.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a hydration heat inhibited concrete expanding agent which comprises 45-85 wt% of hydration heat inhibited expanding clinker and 15-55 wt% of gypsum; the main expansion sources of the hydration heat inhibition type expansion clinker are free calcium oxide and anhydrous calcium sulphoaluminate, and the net slurry hydration temperature peak of the fired expansion clinker is obviously reduced and delayed to a certain degree by adding metal ions or metal oxides, so that the addition of the metal ions or the metal oxides has an obvious effect on inhibiting the hydration of cement;
(2) compared with the common expansion clinker, the hydration heat inhibited expansion clinker has the advantages that the initial setting time and the final setting time are prolonged to a certain degree, and the compression strength and the expansion rate of concrete are not adversely affected;
(3) the early expansion rate of the clinker can be slowed down by adding metal ions or metal oxides, and the shrinkage of the concrete generated at different ages is compensated, so that the expanding agent provided by the invention has better expansion performance and long expansion stability period;
(4) the hydration heat inhibition type expansion clinker is fired at high temperature by adopting an ion doping technology, the preparation method is simple and feasible, and the calcination temperature of the expansion agent clinker can be effectively reduced.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a hydration heat inhibited concrete expanding agent, which consists of hydration heat inhibited expansion clinker and gypsum, wherein the hydration heat inhibited expansion clinker is prepared from the following raw materials: limestone from Zhejiang Huzhou, iron powder from Zhejiang Huzhou, gypsum from Hubei Wuhan, bauxite from Hubei Wuhan, and copper oxide, barium chloride and titanium oxide from Henan Zheng.
The chemical composition analysis of each raw material for preparing the hydration heat inhibited expanded clinker is shown in table 1:
TABLE 1 analysis table of hydration heat inhibited type expansion clinker raw material composition
Example 1
The embodiment provides a hydration heat inhibited concrete expanding agent which comprises the following components, by weight, 70 wt% of hydration heat inhibited expansion clinker and 30 wt% of gypsum, wherein the hydration heat inhibited expansion clinker is prepared from the following raw materials in parts by weight: 67 parts of limestone, 12 parts of gypsum, 3 parts of iron slag, 17 parts of bauxite and 1 part of copper oxide.
The preparation method of the hydration heat inhibited concrete expanding agent comprises the following steps:
(1) mixing the raw materials for preparing the hydration heat inhibition type expansion clinker, crushing and grinding the raw materials, and sieving the mixture by a 200-mesh sieve to obtain a sieve residue of less than or equal to 1.5 percent;
(2) calcining the mixture at 1250 ℃ for 30min, and naturally cooling to obtain hydration heat inhibition type expansion clinker;
(3) mixing and grinding the hydration heat inhibition type expansion clinker and gypsum, sieving with a 200-mesh sieve to obtain the hydration heat inhibition type concrete expansion agent, wherein the sieve residue is less than or equal to 12%.
Example 2
The embodiment provides a hydration heat inhibited concrete expanding agent, which is different from the embodiment 1 in that the hydration heat inhibited concrete expanding agent comprises the following components in percentage by weight, 70 wt% of hydration heat inhibited expansion clinker and 30 wt% of gypsum, wherein the hydration heat inhibited expansion clinker is prepared from the following raw materials in parts by weight: 66.5 parts of limestone, 12 parts of gypsum, 3 parts of iron slag, 17 parts of bauxite and 1.5 parts of barium chloride.
Example 3
The embodiment provides a hydration heat inhibited concrete expanding agent, which is different from the embodiment 1 in that the hydration heat inhibited concrete expanding agent comprises the following components in percentage by weight, 70 wt% of hydration heat inhibited expansion clinker and 30 wt% of gypsum, wherein the hydration heat inhibited expansion clinker is prepared from the following raw materials in percentage by weight: 66 parts of limestone, 12 parts of gypsum, 3 parts of iron slag, 16 parts of bauxite and 3 parts of titanium oxide.
Comparative example 1
The comparative example provides a hydration heat inhibited concrete expansive agent, which is different from the examples in that metal ions and metal oxides are not added in the process of preparing the hydration heat inhibited concrete expansive clinker.
Performance testing
The hydration heat inhibited type expansion clinker prepared in example 1, example 2, example 3 and comparative example 1 was analyzed for its components, and the analysis results are shown in table 2:
TABLE 2 analysis of hydration heat inhibited type expanded clinker composition
The swelling agent prepared in example 1, example 2, example 3 and comparative example 1 is added into the neat paste according to the mixing amount of 8%, the hydration temperature rise result of the neat paste is tested by taking the reference cement as comparative example 2, and the test result is shown in table 3:
TABLE 3 hydration Heat Performance test
It can be seen from table 3 that, after the metal ions and the metal oxides are added, the net slurry hydration temperature peak of the fired expanded clinker is obviously reduced and delayed to a certain extent, and the addition of the metal ions and the metal oxides has a significant effect on inhibiting the cement hydration.
The expanding agents prepared in example 1, example 2, example 3 and comparative example 1 are added into concrete according to the mixing amount of 10%, the concrete mixing ratio is shown in table 4, the setting time, the limited expansion rate and the compressive strength are tested according to GB23439-2009 concrete expanding agent, and the test results are shown in table 5; the expansion rate of the hydration heat inhibited concrete expanding agent is tested for 1-7 d, and the test results are shown in Table 6:
TABLE 4 concrete Experimental proportions
Remarking: the mixing amount of the hydration heat inhibited concrete expanding agent is the proportion of the total mass of the gelled materials in the mixing proportion of the concrete
TABLE 5 Effect of the expansion Agents on concrete Properties
As can be seen from Table 5, the hydration heat inhibited type expanded clinker has a somewhat longer initial setting time and final setting time than the conventional one, but does not adversely affect the compressive strength and expansion ratio of the concrete.
TABLE 6 limiting expansion ratio
From the results in Table 6, it can be seen that the early expansion rate of the hydration heat inhibited concrete expanding agent is slowed down after the metal ions and the metal oxides are added, the contraction generated by different ages of the concrete is compensated, the expansion stability is long, and the expanding agent has better expansion performance and long expansion stability within the range of the invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The hydration heat inhibited concrete expanding agent is characterized by comprising the following components, by weight, 70-85% of hydration heat inhibited expanding clinker and 15-30% of gypsum; the hydration heat inhibited type expansion clinker is prepared from the following raw materials in parts by weight: 50-70 parts of limestone, 5-15 parts of gypsum, 2-5 parts of iron slag, 10-20 parts of bauxite and 0.1-3.0 parts of metal ions or metal oxides; the metal ions are Cu, Ba, Ti, Cr, Ga, V, Mn, Co, Ni, Sn and Pb, and the metal oxides are oxides corresponding to the metal ions Cu, Ba, Ti, Cr, Ga, V, Mn, Co, Ni, Sn and Pb;
a preparation method of a hydration heat inhibited concrete expanding agent comprises the following steps:
(1) mixing the raw materials for preparing the hydration heat inhibition type expansion clinker, crushing and grinding the raw materials, and sieving the mixture by a 200-mesh sieve to obtain a sieve residue of less than or equal to 1.5 percent;
(2) calcining the mixture at 1150-1350 ℃ for 15-60 min, and naturally cooling to obtain hydration heat inhibition type expanded clinker;
(3) mixing and grinding the hydration heat inhibition type expansion clinker and gypsum, sieving with a 200-mesh sieve to obtain the hydration heat inhibition type concrete expansion agent, wherein the sieve residue is less than or equal to 12%.
2. The hydration heat inhibited concrete expansive agent as claimed in claim 1, wherein the specific surface area of the hydration heat inhibited expansion clinker is not less than 200m2/kg。
3. The hydration heat inhibited concrete expansive agent according to claim 1, wherein the hydration heat inhibited expansive clinker has a main mineral composition of: 30-50 wt% of free calcium oxide, 20-40 wt% of anhydrous calcium sulphoaluminate, 3-15 wt% of dicalcium silicate and 3-10 wt% of iron phase.
4. The hydration heat inhibited concrete expansive agent as claimed in claim 1, wherein the hydration heat inhibited expansion clinker has a CaO content of 50 wt% to 65 wt%, and an Fe content2O3The content of (A) is 1 wt% -5 wt%, Al2O3Is 10 wt% -20 wt%, SO3The content of (A) is 5 wt% -15%, SiO2The content of (A) is 3 wt% -10 wt%.
5. The hydration heat inhibited concrete expansive agent as claimed in claim 4, wherein the hydration heat inhibited expansive clinker raw material has a calcium carbonate content of 45-55 wt% in terms of CaO content and a calcium sulfate content in terms of SO content3The content of (B) is 3-15 wt%, and the content of iron is Fe2O3The content of (A) is 1 to 5 wt%, and the content of aluminum is Al2O3The content of (B) is 5 wt% -20 wt% based on the total mass of the raw materials.
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| CN112110707A (en) * | 2019-06-20 | 2020-12-22 | 武汉三源特种建材有限责任公司 | Hydration regulation and control type expansion clinker and preparation thereof |
| CN110981380B (en) * | 2019-12-20 | 2021-02-02 | 湖南大学 | Concrete for underground pipeline and preparation method thereof |
| CN111875283A (en) * | 2020-07-27 | 2020-11-03 | 武汉三源特种建材有限责任公司 | Temperature control type concrete expanding agent |
| CN113307536A (en) * | 2021-05-25 | 2021-08-27 | 天津市金盛源特种建材有限公司 | Anticorrosive and rust-resistant anti-cracking waterproof agent |
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