CN115259730B - Concrete composite admixture containing tuff powder and preparation method thereof - Google Patents
Concrete composite admixture containing tuff powder and preparation method thereof Download PDFInfo
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- CN115259730B CN115259730B CN202210562082.3A CN202210562082A CN115259730B CN 115259730 B CN115259730 B CN 115259730B CN 202210562082 A CN202210562082 A CN 202210562082A CN 115259730 B CN115259730 B CN 115259730B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a concrete composite admixture containing tuff powder and a preparation method thereof, belonging to the technical field of building materials. Comprises the following components in percentage by mass: 50 to 70 percent of fine limestone powder 30-50% of superfine powder; the preparation method of the fine limestone powder comprises the following steps: mixing the tuff ore with sodium hexametaphosphate, melamine and an activity excitant, and then performing ball milling for 1-2 hours to obtain the tuff powder. According to the invention, the limestone, the melamine and the activity excitant are mixed and ground, so that the melamine can improve grinding efficiency on one hand and can play a role in reducing water on the other hand, and the fluidity ratio of the composite admixture is improved; meanwhile, an active excitant is added during grinding, and under the combined action of mechanochemical action and chemical excitation, the activity index of the composite admixture is improved, and the strength of the concrete in each age is ensured.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a concrete composite admixture containing tuff powder and a preparation method thereof.
Background
The mineral admixture is used as an important constituent material of concrete with a main structure of civil engineering, can obviously improve the workability of the concrete, improve the strength and the durability of the concrete and effectively reduce the cost of the concrete, and becomes an indispensable component in the concrete cementing material. The traditional common mineral admixture has industrial byproducts such as fly ash, slag powder, silica fume and the like, and along with the high-speed promotion of the basic construction of China, the mineral powder, fly ash and other high-quality mineral admixtures face the problems of resource shortage and uneven regional distribution. For example, in the whole Sichuan and Tibet areas, due to low environmental protection requirements and low industrial development degree, the traditional mineral admixture for the areas is very short, and in order to meet engineering construction requirements, materials such as fly ash and the like are purchased from an external province, so that engineering construction cost is greatly increased.
Studies show that igneous rock minerals have similar chemical compositions as fly ash, and have certain potential hydration activity after being ground into certain fineness, the chemical activity is similar to that of pozzolanic materials, fly ash and the like, and active silica, active alumina and calcium hydroxide react to generate hydrated calcium aluminosilicate with gel property, so that the hydrated calcium aluminosilicate can be used for producing concrete instead of fly ash. However, some igneous minerals contain pores with the volume content of more than 50%, and the pores can greatly increase the water demand when used as concrete admixture, so that the fluidity ratio is small, and the working performance of concrete is not facilitated; in addition, the reaction activity is low, the development of the later strength of the concrete is not facilitated, and the problems of slow later strength increase, poor compactness of the concrete and the like are caused. Therefore, the igneous rock material is used as a concrete mineral admixture, and the concrete mineral admixture needs to be modified to effectively solve the problems. For example, chinese patent CN106242333a discloses a method for preparing tuff powder admixture, wherein 1000 parts by weight of tuff is mixed with 0.13-1.3 parts by weight of modifier, and the modifier comprises grinding aid component, air entraining component and thickening component. However, the tuff powder blends have lower 7d and 28d activity indexes and limited ability to improve the post-strength of concrete.
Therefore, in order to meet the actual engineering needs, the preparation of the mineral admixture which can replace the traditional fly ash and slag powder has the advantages of lower cost, simple preparation method and excellent performance is urgent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the concrete composite admixture containing the tuff powder, which has high activity index and high fluidity, can effectively improve the fluidity of fresh concrete and improve the compressive strength of the concrete.
In order to achieve the above purpose, the specific technical scheme of the invention is as follows:
the concrete composite admixture containing the tuff powder comprises the following components in percentage by mass: 50 to 70 percent of fine limestone powder 30-50% of superfine powder;
the preparation method of the fine limestone powder comprises the following steps: mixing the tuff ore with sodium hexametaphosphate, melamine and an activity excitant, and then performing ball milling for 1-2 hours to obtain the tuff powder.
The physical activity effect of the tuff can be exerted through grinding, the activity index of the tuff is improved, but after the tuff is ground, the particle size is reduced, the specific surface area is increased, and when the slurry reaches the same fluidity under the condition that the thickness of a water film on the surface of the particle is unchanged, the quantity of free mixing water in the slurry is reduced, so that the whole fluidity is reduced, and the water demand is increased. In order to solve the technical problems, the invention carries out mixed grinding on tuff, melamine and an activity excitant, so that the melamine can improve grinding efficiency on one hand and can play a role in reducing water on the other hand, thereby improving the fluidity ratio of the composite admixture; meanwhile, an active excitant is added during grinding, and under the combined action of mechanochemical action and chemical excitation, the activity index of the composite admixture is improved, and the strength of the concrete in each age is ensured.
Meanwhile, the inventor finds that after the independent tuff is ground, more scraps are adsorbed on the surfaces of the tuff large-size particles, and the adsorption phenomenon on the surfaces of the tuff particles is more obvious along with the extension of grinding time; indicating that tuff powder has an agglomeration effect (as shown in fig. 1-2), which will affect the grinding effect and also the reactivity of tuff powder; according to the invention, the sodium hexametaphosphate is added in the tuff grinding process, so that the sodium hexametaphosphate has good dispersibility, tuff powder can be dispersed, the agglomeration effect of tuff powder is avoided, on one hand, the grinding efficiency can be improved, and on the other hand, the activity index of the composite admixture can be improved.
According to the invention, sodium hexametaphosphate, melamine and an activity excitant are added during grinding, so that the grinding efficiency can be effectively improved, and meanwhile, the fluidity ratio and the activity index of the composite admixture can be effectively improved.
Preferably, the ball milling conditions are: the ball-material ratio is 1 (1.5-2), and the rotating speed is 100-140 rpm.
PreferablyIn the tuff, siO 2 The content of (C) is more than 65wt%, al 2 O 3 The content of (2) is more than 15wt%, fe 2 O 3 The content of (2) is more than 2.5wt%.
Preferably, the mass ratio of the tuff ore to the melamine to the activity excitant is 100 (1-2) (3-5) (0.2-0.5).
Preferably, the activity activator comprises at least one of dihydrate gypsum, alunite or quicklime.
Preferably, the superfine powder is prepared by mixing and grinding fly ash, slag powder and grinding aid according to the mass ratio of (40-50) (45-55) (0.1-0.5).
Preferably, the grinding aid is prepared by mixing triethanolamine, diethanol monoisopropanolamine, sodium dodecyl sulfonate and water according to a weight ratio of 20:19:6:55. The triethanolamine has grinding assisting and reinforcing effects, and the sodium dodecyl sulfonate is used as a surfactant to play roles in dispersing, emulsifying and solubilizing, so that the dispersion effect of the triethanolamine and the diethanol monoisopropanolamine in water is better; the triethanolamine, the diethanol monoisopropanolamine and the sodium dodecyl sulfonate are mixed for use, so that a better grinding assisting effect can be obtained.
Preferably, the specific surface area of the superfine powder is 600-700 m 2 /kg。
Preferably, the fineness of the fly ash is less than 30 percent, and SiO 2 、Al 2 O 3 And Fe (Fe) 2 O 3 The total mass fraction of (2) is greater than 70%, and the 28d activity index is greater than 70%.
The invention also aims to provide a preparation method of the concrete composite admixture, which comprises the following steps: mixing tuff powder and ultrafine powder according to the mass ratio, and uniformly stirring to obtain the concrete composite admixture.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the limestone, the melamine and the activity excitant are mixed and ground, so that the melamine can improve grinding efficiency on one hand and can play a role in reducing water on the other hand, and the fluidity ratio of the composite admixture is improved; meanwhile, an active excitant is added during grinding, and under the combined action of mechanochemical action and chemical excitation, the activity index of the composite admixture is improved, and the strength of the concrete in each age is ensured.
(2) According to the invention, the sodium hexametaphosphate is added in the tuff grinding process, so that the sodium hexametaphosphate has good dispersibility, tuff powder can be dispersed, the agglomeration effect of tuff powder is avoided, on one hand, the grinding efficiency can be improved, and on the other hand, the activity index of the composite admixture can be improved.
(3) The triethanolamine has grinding assisting and reinforcing effects, and the sodium dodecyl sulfonate is used as a surfactant to play roles in dispersing, emulsifying and solubilizing, so that the dispersion effect of the triethanolamine and the diethanol monoisopropanolamine in water is better; the triethanolamine, the diethanol monoisopropanolamine and the sodium dodecyl sulfonate are mixed for use, so that a better grinding assisting effect can be obtained.
Drawings
FIG. 1 is an SEM image of tuff ore alone after 1 hour of milling;
fig. 2 is an SEM image of tuff ore alone after 2 hours of grinding.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
In the following examples and comparative examples, the chemical composition of tuff is as follows: siO (SiO) 2 The content of (C) is 68.71wt%, al 2 O 3 The content of (C) is 15.16wt%, fe 2 O 3 The content of (2) 79wt%, the content of CaO 2.23wt%, the content of MgO 1.34wt%, and SO 3 The content of (C) was 0.2% by weight and the loss on ignition was 3.2%. The fineness of the fly ash is less than 30 percent, siO 2 、Al 2 O 3 And Fe (Fe) 2 O 3 The total mass fraction of (2) is greater than 70%, and the 28d activity index is greater than 70%. The slag powder is S95 slag powder.
Example 1
The embodiment provides a preparation method of a concrete composite admixture containing tuff powder, which comprises the following steps:
s1, mixing tuff ore, sodium hexametaphosphate, melamine and dihydrate gypsum according to a mass ratio of 100:1.5:4:0.3, transferring into a ball mill, and ball milling for 1h under the conditions that a ball-material ratio is 1:1.8 and a rotating speed is 120rpm to obtain tuff powder; the fineness of the resulting tuff was 9.25%.
S2, placing the fly ash, the slag powder and the grinding aid into grinding equipment according to the mass ratio of 45:55:0.3 for mixed grinding to obtain the powder with the specific surface area larger than 600m 2 Ultrafine powder/kg; the grinding aid is prepared by mixing triethanolamine, diethanol monoisopropanolamine, sodium dodecyl sulfonate and water according to a weight ratio of 20:19:6:55;
s3, uniformly stirring 60wt% of the limestone powder obtained in the step S1 and 40wt% of the ultrafine powder obtained in the step S2 to obtain the concrete composite admixture.
According to the embodiment, the tuff powder and the ultrafine powder are prepared step by step, then the tuff powder and the ultrafine powder are mixed, sodium hexametaphosphate, melamine and gypsum dihydrate are added in the tuff ore grinding process, and the grinding aid is added in the fly ash and slag powder grinding process, so that the grinding efficiency can be improved, the grinding energy consumption is reduced, and the composite admixture with high activity index and high fluidity is obtained.
Example 2
The embodiment provides a preparation method of a concrete composite admixture containing tuff powder, which comprises the following steps:
s1, mixing tuff ore, sodium hexametaphosphate, melamine and dihydrate gypsum according to a mass ratio of 100:1:5:0.5, transferring into a ball mill, and ball milling for 1h under the conditions of a ball-material ratio of 1:1 and a rotating speed of 140rpm to obtain tuff powder; the fineness of the resulting tuff was 11.23%.
S2, placing the fly ash, the slag powder and the grinding aid into grinding equipment according to the mass ratio of 50:50:0.5 for mixed grinding to obtain a specific surface area of more than 600m 2 Ultrafine powder/kg; wherein the grinding aid consists of triethanolamine and diethylMixing alcohol monoisopropanolamine, sodium dodecyl sulfonate and water according to a weight ratio of 20:19:6:55;
s3, uniformly stirring 50wt% of the limestone powder obtained in the step S1 and 50wt% of the ultrafine powder obtained in the step S2 to obtain the concrete composite admixture.
Example 3
The embodiment provides a preparation method of a concrete composite admixture containing tuff powder, which comprises the following steps:
s1, mixing tuff ore, sodium hexametaphosphate, melamine and dihydrate gypsum according to a mass ratio of 100:2:3:0.2, transferring into a ball mill, and ball milling for 1h under the conditions of a ball-material ratio of 1:2 and a rotating speed of 100rpm to obtain tuff powder; the fineness of the resulting tuff was 12.81%.
S2, placing the fly ash, the slag powder and the grinding aid into grinding equipment according to the mass ratio of 40:55:0.1 for mixed grinding to obtain the powder with the specific surface area larger than 600m 2 Ultrafine powder/kg; the grinding aid is prepared by mixing triethanolamine, diethanol monoisopropanolamine, sodium dodecyl sulfonate and water according to a weight ratio of 20:19:6:55;
s3, uniformly stirring 70wt% of the limestone powder obtained in the step S1 and 30wt% of the ultrafine powder obtained in the step S2 to obtain the concrete composite admixture.
Example 4
Example 4 is substantially the same as example 1 except that in step S1, the ball milling time is 2h. The fineness of the resulting tuff was 8.05%.
Comparative example 1
This comparative example is substantially the same as example 1 except that in step S1, the ball milling time was 0.5h. The fineness of the resulting tuff was 22.20%.
Comparative example 2
The preparation method of this comparative example is substantially the same as in example 1, except that step S1 is as follows:
s1, mixing tuff ore, sodium hexametaphosphate and dihydrate gypsum according to a mass ratio of 104:1.5:0.3, transferring into a ball mill, and ball milling for 1h under the conditions that the ball material ratio is 1:1.8 and the rotating speed is 120rpm to obtain tuff powder;
steps S2 and S3 are the same as in example 1, i.e. the composite blend of this comparative example lacks melamine compared to example 1.
Comparative example 3
The preparation method of this comparative example is substantially the same as in example 1, except that step S1 is as follows:
s1, mixing tuff ore, melamine and dihydrate gypsum according to a mass ratio of 101.5:4:0.3, transferring into a ball mill, and ball milling for 1h under the conditions that the ball material ratio is 1:1.8 and the rotating speed is 120rpm to obtain tuff powder;
steps S2 and S3 are the same as in example 1, i.e., the composite admixture of this comparative example lacks sodium hexametaphosphate as compared to example 1.
Comparative example 4
The preparation method of this comparative example is substantially the same as in example 1, except that step S2 is as follows:
s2, placing the fly ash, the slag powder and the grinding aid into grinding equipment according to the mass ratio of 45:55:0.3 for mixed grinding to obtain the powder with the specific surface area larger than 600m 2 Ultrafine powder/kg; the grinding aid is prepared by mixing triethanolamine, diethanol monoisopropanolamine and water according to a weight ratio of 20:19:61;
steps S1 and S3 are the same as in example 1, i.e. the grinding aid of this comparative example lacks sodium dodecyl sulfate as compared to example 1.
Test examples
The fluidity ratio and the activity index of the composite blends of examples and comparative examples were tested according to the relevant regulations of JG/T315-2011 "Natural pozzolanic Material for Cement mortar and concrete". A mortar test piece with the molding size of 40mm multiplied by 160mm is molded by adopting Huaxin P.O 42.5 cement and ISO standard sand, the water-cement ratio of the mortar is controlled to be 0.5, the mixing amount of the composite admixture is 30%, and the mass ratio of the cementing material to the standard sand is 1:3. And (3) molding the test piece in a 20 ℃ environment, curing for 24 hours with a mold, removing the mold, moving the test piece into a standard curing room, and testing the fluidity ratio and the activity index after curing to each age. The test results are shown in Table 1.
TABLE 1 fluidity ratio and Activity index
| Group of | Fluidity ratio (%) | 28d Activity index (%) |
| Example 1 | 103 | 81 |
| Example 2 | 101 | 79 |
| Example 3 | 102 | 80 |
| Example 4 | 102 | 84 |
| Comparative example 1 | 99 | 70 |
| Comparative example 2 | 95 | 68 |
| Comparative example 3 | 99 | 69 |
| Comparative example 4 | 102 | 80 |
As can be seen from the data in table 1, the composite blends of examples 1 to 4 of the present invention have high fluidity ratio and activity index as compared to comparative examples 1 to 4; comparative example 1 the grinding time of the tuff ore was too short, resulting in an increase in fineness of the tuff powder and a decrease in the activity index of the composite admixture. Comparative example 2 lacks melamine, on the one hand the grinding efficiency of tuff ore is reduced, the activity index is reduced, and on the other hand the fluidity ratio is reduced due to the lack of water reducing effect. Comparative example 3 lacks sodium hexametaphosphate, the dispersibility of the fine limestone powder is reduced, and the activity index of the composite admixture is reduced. The grinding aid of comparative example 4 lacks sodium dodecyl sulfate, which results in reduced grinding effect and longer grinding time under the condition of ensuring the specific surface area of the superfine powder to meet the requirement.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The concrete composite admixture containing the tuff powder is characterized by comprising the following components in percentage by mass: 50 to 70 percent of fine limestone powder 30-50% of superfine powder;
the preparation method of the fine limestone powder comprises the following steps: mixing tuff ore with sodium hexametaphosphate, melamine and an active activator, and then performing ball milling for 1-2 hours to obtain tuff powder, wherein the active activator comprises at least one of dihydrate gypsum, alunite or quicklime.
2. The concrete composite admixture containing the tuff powder according to claim 1, wherein the ball milling conditions are as follows: the ball-material ratio is 1 (1.5-2), and the rotating speed is 100-140 rpm.
3. The concrete composite admixture containing tuff powder according to claim 1, wherein Si0 in the tuff 2 The content of A1 is more than 65wt% 2 0 3 The content of (2) is more than 15wt%, fe 2 0 3 The content of (2) is more than 2.5wt%.
4. The concrete composite admixture containing the tuff powder according to claim 1, wherein the mass ratio of the tuff ore to the sodium hexametaphosphate to the melamine to the activity excitant is 100 (1-2): 3-5): 0.2-0.5.
5. The concrete composite admixture containing the tuff powder according to claim 1, wherein the superfine powder is prepared by mixing and grinding fly ash, slag powder and grinding aid according to the mass ratio of (40-50): (45-55): (0.1-0.5).
6. The concrete composite admixture containing the tuff powder according to claim 5, wherein the grinding aid is obtained by mixing triethanolamine, diethanol monoisopropanolamine, sodium dodecyl sulfonate and water according to a weight ratio of 20:19:6:55.
7. The concrete composite admixture containing fine powder of claim 5, wherein the specific surface area of the fine powder is 600-700 m 2 /kg。
8. The concrete composite admixture containing the tuff powder according to claim 5, wherein the fineness of the fly ash is less than 30% and Si0 2 、A1 2 0 3 And Fe (Fe) 2 0 3 The total mass fraction of (2) is greater than 70%, and the 28d activity index is greater than 70%.
9. The method for preparing the concrete composite admixture according to any one of claims 1 to 8, comprising the following steps: mixing tuff powder and ultrafine powder according to the mass ratio, and uniformly stirring to obtain the concrete composite admixture.
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| CN202210562082.3A CN115259730B (en) | 2022-05-23 | 2022-05-23 | Concrete composite admixture containing tuff powder and preparation method thereof |
| PCT/CN2023/095275 WO2023226892A1 (en) | 2022-05-23 | 2023-05-19 | Concrete composite admixture containing tuff powder and preparation method therefor |
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| CN117361909A (en) * | 2023-10-08 | 2024-01-09 | 中国建筑土木建设有限公司 | Preparation method of high-strength tuff composite cementing material |
| CN117658510B (en) * | 2024-01-31 | 2024-04-12 | 北京中航天业科技有限公司 | Steel slag micropowder activity excitant based on high-temperature-chemical-mechanical coupling excitation and preparation method and application thereof |
| CN118307224B (en) * | 2024-06-11 | 2024-08-16 | 湖南高翔新材料有限公司 | Composite admixture for high-strength high-performance concrete and preparation method thereof |
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| CN101172799A (en) * | 2007-10-15 | 2008-05-07 | 张仲 | Natural activity volcanic ash concrete blunging material and application thereof |
| CN101219882B (en) * | 2008-01-22 | 2011-08-03 | 桂林工学院 | Method for producing concrete blending material by using igneous rock |
| KR101492878B1 (en) * | 2014-09-05 | 2015-02-12 | (주)지에프시알엔디 | Self-curing concrete additive composition and preparation method of concrete with improved durability |
| CN106746818B (en) * | 2016-12-29 | 2019-03-12 | 宁波工程学院 | A kind of concrete admixture, preparation method and the concrete containing the admixture |
| CN108002720A (en) * | 2017-11-08 | 2018-05-08 | 马鞍山豹龙新型建材有限公司 | A kind of preparation method of high activity superfine graining slag micropowder |
| CN108046745A (en) * | 2018-01-03 | 2018-05-18 | 景德镇陶瓷大学 | A kind of preparation method of the magnesia household china of graphene enhancing |
| CN109400062B (en) * | 2018-11-16 | 2021-04-30 | 中国路桥工程有限责任公司 | Natural volcanic ash green high-performance concrete |
| CN112608104B (en) * | 2020-12-23 | 2023-03-21 | 中建西部建设新疆有限公司 | Light high-strength anti-cracking self-repairing tuff concrete and preparation method thereof |
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