CN115432951A - Preparation method of mineral admixture for commercial concrete - Google Patents
Preparation method of mineral admixture for commercial concrete Download PDFInfo
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- CN115432951A CN115432951A CN202211220440.9A CN202211220440A CN115432951A CN 115432951 A CN115432951 A CN 115432951A CN 202211220440 A CN202211220440 A CN 202211220440A CN 115432951 A CN115432951 A CN 115432951A
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/047—Zeolites
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0427—Dry materials
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a preparation method of a mineral admixture for commercial concrete, which takes bulk industrial solid wastes as raw materials, prepares cement clinker, bulk industrial solid wastes and grinding aid additives according to a certain mass ratio, continuously adds the raw materials into a grinding device from a grinding head at a certain feeding speed, starts the grinding device for grinding processing, and discharges the grinding tailings at the same speed as the feeding speed to obtain a mineral admixture finished product, namely the mineral admixture for the commercial concrete. The cement clinker and the bulk industrial solid waste are used as raw materials, the raw materials with low pozzolanic activity are processed into the mineral admixture with high pozzolanic activity by the grinding processing technology, the performance and the application value of the bulk industrial solid waste are improved, and the environment-friendly benefit and the economic benefit are good.
Description
Technical Field
The invention relates to a preparation method of a mineral admixture, in particular to a preparation method of a mineral admixture for commercial concrete, belonging to the field of production technology application of commercial concrete.
Background
Commercial concrete is produced by centralizing a series of procedures of raw material selection, mixing proportion design, selection of an additive and a mineral admixture, mixing of concrete and the like in the production process of concrete from a construction site to a mixing plant, so that the production of concrete is changed from extensive production to intensive production. The commercial concrete has the advantages of high automation degree, high production efficiency, good quality stability, good environmental protection and the like, and is a trend and direction for the development of the domestic concrete industry.
The commercial concrete is prepared by mixing a cementing material, sandstone aggregate, water and an additive. With the shortage of natural sandstone resources and the implementation of policies such as environmental protection policy, carbon emission and carbon peak reaching, artificial sandstone aggregates, recycled aggregates and the like are popularized and applied in commercial concrete on a large scale, and the raw materials of the concrete have defects in the aspects of clay content, sulfate content, stone powder content, particle size, particle gradation and the like, so that the workability problems of bleeding, slurry running and the like of the mixed concrete are easily caused. Powdered materials with volcanic ash activity, such as mineral powder, fly ash, micro-beads, silica fume and the like, are used as raw materials of cement or as cementing materials to partially replace the cement, and the application of the powdered materials in the aspects of concrete workability, mechanical property, durability and the like becomes a trend.
Han Jianguo, et al, influence of mineral admixtures and chemical admixtures on rheological parameters of cementitious material slurry [ J ],2021,54 (10): 56-63, research shows that the cementitious material slurry can be approximately regarded as Bingham fluid, and the rheological property control of the cementitious material slurry usually involves three factors of water-to-gel ratio, mineral admixtures and chemical admixtures. In the aspect of reducing the yield stress and the molding viscosity of the slurry, the equal-volume substitution of powder materials such as fly ash, mineral powder, silica fume, quartz powder, fly ash microspheres and the like for a part of cement is better than the equal-volume substitution of a part of cement.
Researches on the influence of section bearing steel and other 'complex-doped high-performance mineral admixtures on the performance of high-strength mechanism sand concrete [ J ],2021,40 (7): 2296-2305' show that the micro-beads and the S105 mineral powder can effectively reduce the drying shrinkage of the high-strength mechanism sand concrete, and further, the micro-beads and the S105 mineral powder are added in a proper range to obviously improve the compressive strength of the high-strength mechanism sand concrete. Under the condition of ensuring good workability and drying shrinkage performance of concrete, compared with the single-doped S105 mineral powder, the double-doping of the S105 mineral powder and different mineral admixtures has more remarkable effect on improving the later strength.
Chinese patent CN103342489B reports an admixture composed of desulfurized slag and water glass, which replaces 10% -20% of cement, and is used as a fine filler in concrete and filled among cement particles, thereby improving the impermeability, frost resistance, durability and compressive strength of the concrete to a certain extent.
Chinese patent CN112225482A reports that a mineral admixture formed by mixing silica fume, a tailing admixture, limestone powder and dihydrate gypsum is added into concrete instead of fly ash, so that the water retention of the concrete can be improved, and the concrete can keep good fluidity from production to construction.
Chinese patent CN107555896A and Chinese patent CN107986643A respectively report that the use of mineral admixture compounded by water glass or gypsum, steel slag and fly ash has certain promotion effect on the early and later curing activity of concrete.
In conclusion, the mineral admixture is prepared from powdered materials such as mineral powder, fly ash, micro-beads and silica fume, and the powdered materials are used as a cementing material to replace part of cement in concrete, so that the effect of improving the workability, mechanical property and durability of commercial concrete is achieved. Furthermore, the mineral admixture replaces part of cement to serve as a cementing material, so that the cement dosage in concrete is obviously reduced, the energy consumption and carbon dioxide emission in the cement industry are reduced, and the implementation of the national carbon emission and carbon peak-reaching policy is facilitated.
However, the current work mainly focuses on the research on the application performance of mineral admixtures such as mineral powder, fly ash and silica fume, and the research on the composition variation, fineness, specific surface area, particle size distribution and median particle size (D) of the mineral admixtures 50 ) And the research work on the working performance, the normal-temperature curing activity and the normal-temperature curing strength of the mineral admixture is less. In addition, the mass fluctuation of the fly ash is large; the silica fume needs a large amount of water; the workability improvement effect of the micro-beads in normal-temperature curing concrete is obvious, but the curing activity is similar to that of fly ash. Needs to deeply research the compounding and grinding processing technology of mineral admixture and improve the mineral admixtureThe working performance, the maintenance activity and the quality stability of the product.
Based on the above, the research and development of a preparation method of mineral admixture for commercial concrete, which takes a large amount of solid wastes as raw materials, is simple in preparation, small in quality fluctuation, high in normal-temperature curing activity and good in economical efficiency, is urgently needed.
Disclosure of Invention
The invention aims to provide a preparation method of a mineral admixture for commercial concrete, which takes a large amount of solid wastes as raw materials, is simple to prepare, has small quality fluctuation, high normal-temperature curing activity and good economical efficiency, and particularly provides a preparation method of a mineral admixture for commercial concrete.
The invention realizes the aim through the following technical scheme, a preparation method of mineral admixture for commercial concrete takes bulk industrial solid wastes as raw materials, cement clinker, bulk industrial solid wastes and grinding aid additive are prepared according to a certain mass ratio, then the cement clinker, the bulk industrial solid wastes and the grinding aid additive are continuously added into a grinding device from a grinding head at a certain feeding speed, the grinding device is started for grinding processing, and the grinding tail is discharged at the same speed as the feeding speed to obtain a mineral admixture finished product, namely the mineral admixture for the commercial concrete;
the bulk industrial solid waste comprises a main raw material with pozzolanic activity and an auxiliary raw material for exciting pozzolanic activity;
the mass percentage of the cement clinker, the main raw material and the auxiliary raw material is (5-15%) (80-90%) (5-10%);
the grinding aid additive comprises a commercially available early strength polycarboxylate superplasticizer and an alcohol amine esterified substance, wherein the mass ratio of the early strength polycarboxylate superplasticizer to the alcohol amine esterified substance is (1-2) to 1;
the dosage of the grinding aid additive is 0.05-0.15% of the total mass of the cement clinker and the bulk industrial solid waste.
Preferably, the cement clinker is commercially available cement clinker, is formed by firing clay, limestone and iron ore, and is irregular granular in shape.
Preferably, the main raw materials comprise one or a mixture of several of slag, lithium slag, raw ash, coarse ash, secondary ash, primary ash, silica fume and zeolite powder, and the auxiliary raw materials comprise an alkaline calcareous raw material and a sulfate-containing raw material, and are prepared according to any mass percentage.
Preferably, the alkaline calcareous raw material comprises one of limestone, calcium hydroxide, calcium nitrate and carbide slag, and the sulfate-containing raw material comprises one of gypsum stone, gypsum powder, desulfurized gypsum, phosphogypsum and alunite powder.
Preferably, the alcohol amine esterified substance comprises one of triethanolamine maleic anhydride monoester, diethanol monoisopropanolamine maleic anhydride monoester, triisopropanolamine maleic anhydride monoester, triethanolamine phosphate monoester, diethanol monoisopropanolamine phosphate monoester and triisopropanolamine phosphate monoester.
Preferably, the mineral admixture for commercial concrete has a specific surface area of 600 to 1000m 2 Per Kg; the fineness is less than or equal to 4 percent; median particle diameter (D) 50 ) 3-10 μm; the standard culture activity of the 28d colloidal sand reaches the S95 mineral powder level.
The invention has the beneficial effects that: the invention discloses a preparation method of a mineral admixture for commercial concrete, which has obvious advantages in the following aspects:
(1) The cement clinker and the bulk industrial solid waste are used as raw materials, the raw materials with low pozzolanic activity are processed into the mineral admixture with high pozzolanic activity by the grinding processing technology, the performance and the application value of the bulk industrial solid waste are improved, and the environment-friendly benefit and the economic benefit are good.
(2) The invention uses the alkaline calcareous raw material and the sulfate-containing calcareous raw material as auxiliary raw materials, has alkali excitation and sulfate excitation effects on the raw materials with volcanic ash activity such as cement and the like, does not contain alkali ions such as sodium ions, potassium ions and the like, and avoids the problems of concrete whiskering and durability caused by the standard exceeding of the alkali ions in the mineral admixture.
(3) According to the invention, a commercially available early strength polycarboxylate superplasticizer and an alcohol amine esterified substance are used as grinding-aid additives, and the early strength polycarboxylate superplasticizer has water reducing, early strength and auxiliary grinding-aid effects in a mineral admixture, so that the working performance of the mineral admixture is ensured; the alcohol amine esterified substance has good grinding-assisting effect and standard-maintenance activity improving effect, and has certain inhibiting effect on clay and stone powder in mineral admixture through micromolecule adsorption.
(4) The invention provides grinding equipment for preparing mineral admixture, which divides a grinding device into a pre-grinding device and a core grinding device and fully considers the feeding requirements of powder, particle or block materials. Furthermore, the core grinding device is arranged in a bin-by-bin manner, and the grading of the steel balls or the steel forgings in the mill is adjusted along with the particle size change of the powder material from the grinding head to the tail of the mill, so that the grinding effect of the grinding equipment on the material is fully exerted, and the grinding efficiency of the grinding equipment is improved.
Drawings
FIG. 1 is a process flow diagram of the present invention for producing a mineral admixture for commercial concrete.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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 present invention is described in detail below by way of examples, which are intended to be illustrative only and not to be construed as limiting the scope of the invention, and one skilled in the art will be able to make variations within the scope of the invention based on the disclosure herein, in reagents, catalysts and reaction process conditions. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
All powder raw materials in the invention are commercial products, the parts are referred to as mass parts in the examples, and the addition amount of other materials is converted into mass parts.
The specific surface area is measured by using a DBT-127 type Boehringer's air permeability specific surface area meter;
in the invention, the fineness uses an FSY-150B cement fineness negative pressure screen analyzer to measure the screen allowance of a 30-micron square-hole screen, and the screen allowance accounts for the total material amount by mass percent to obtain the fineness;
median particle diameter (D) in the invention 50 ) And the particle size distribution was measured using a BT-9300 type laser particle size analyzer.
The standard curing activity of the mortar in the invention is tested by referring to a method specified in GB/T18046-2017 granulated blast furnace slag powder used in cement, mortar and concrete.
A preparation method of mineral admixture for commercial concrete takes bulk industrial solid waste as raw material, and cement clinker, bulk industrial solid waste and grinding aid additive are prepared according to a certain mass ratio.
The cement clinker is commercially available cement clinker, is formed by firing clay, limestone and iron ore, and is irregular granular in shape.
The bulk industrial solid waste comprises main raw materials with volcanic ash activity and auxiliary raw materials for exciting the volcanic ash activity, and the auxiliary raw materials mainly have the functions of providing a calcium source, alkali excitation and sulfate excitation for the mineral admixture and improving the activity and the curing strength of the mineral admixture.
The main raw materials comprise one or a mixture of more of slag, lithium slag, raw ash, coarse ash, secondary ash, primary ash, silica fume and zeolite powder, the auxiliary raw materials comprise alkaline calcium raw materials and sulfate-containing raw materials, the alkaline calcium raw materials are prepared according to any mass percentage, the alkaline calcium raw materials comprise one of limestone, calcium hydroxide, calcium nitrate and carbide slag, and the sulfate-containing raw materials comprise one of gypsum stone, gypsum powder, desulfurized gypsum, phosphogypsum and alum stone powder.
The grinding aid additive comprises a commercially available early strength polycarboxylate water reducer and an alcohol amine esterified substance, wherein the early strength polycarboxylate water reducer plays a role in reducing water, early strength and assisting in grinding aid, the alcohol amine esterified substance comprises one of triethanolamine maleic anhydride monoester, diethanol monoisopropanolamine maleic anhydride monoester, triisopropanolamine maleic anhydride monoester, triethanolamine phosphoric monoester, diethanol monoisopropanolamine phosphoric monoester and triisopropanolamine phosphoric monoester, the grinding aid effect can be improved, and the mass ratio of the early strength polycarboxylate water reducer to the alcohol amine esterified substance is (1-2): 1.
The market early strength polycarboxylate superplasticizer used in the invention has the code ZQ-1, the solid content is 40 percent, and the weight average molecular weight M w ＝45000。
The alcohol amine ester used in the invention is a commercially available product.
The mass percentage of the cement clinker, the main raw material and the auxiliary raw material is (5-15%) (80-90%) (5-10%); the dosage of the grinding aid additive is 0.05-0.15% of the total mass of the cement clinker and the bulk industrial solid waste.
The grinding device adopted in the invention is a commercial vertical grinding machine, and comprises a pre-grinding device and a core grinding device, wherein the pre-grinding device is used for processing granular or blocky raw materials in the raw materials of the powder into powder with the particle size of less than 2mm so as to meet the feeding requirement of the core grinding device; the core grinding device is mainly a large-scale tube mill, and generally comprises tube mills with the standard sizes of 3.2m multiplied by 11m,3.2m multiplied by 13m,3.5m multiplied by 17m, 3.8m multiplied by 13m,3.8m multiplied by 15m,3.8m multiplied by 17m 4.2m multiplied by 13m,4.2m multiplied by 15m,4.2m multiplied by 17m and the like, wherein the tube mills are internally filled with steel balls or steel forgings as grinding accessories, commercially available steel balls or steel forgings, generally alloy steel materials containing nickel and chromium in the inner body, the loading amount of the steel balls or steel forgings is 15-30% of the volume of the tube mills, and the diameters of the steel balls are 50mm, 400mm, 30mm, 2mm, 15mm,10mm,8mm,6mm and the like; the steel forging was 50 mm. Times.50mm, 40mm. Times.40mm, 30mm. Times.30mm, 20mm. Times.20mm, 15mm. Times.15mm, 10mm. Times.10mm, 8mm. Times.8mm, 6mm. Times.6 mm and the like.
The tube mill comprises an open-circuit tube mill and a closed-circuit tube mill, the tube mill is internally divided into three bin sections by wall plates, and the ball forging grades of the bin sections of the tube mill are as follows: the grain diameter of the steel ball or steel forging grains in the first bin section is 30-50 mm, and each grain diameter accounts for one third; the grain diameter of the steel ball or steel forging grains in the second bin section is 10-20 mm, and each grain diameter accounts for one third; the grain diameter of the grains in the third bin section is 6-10 mm, and each grain diameter accounts for one third.
As shown in FIG. 1, the preparation process of the mineral admixture for commercial concrete disclosed by the invention comprises the following steps:
bulk industrial solid wastes are used as raw materials, cement clinker, bulk industrial solid wastes and grinding aid additives are prepared according to the mass ratio disclosed in the embodiment, and the cement clinker and the bulk industrial solid wastes are metered and conveyed to a pre-grinding device and a core grinding device through different pipelines or belt conveying systems. Wherein, the granular or blocky raw materials are firstly measured and conveyed to a pre-grinding device and processed into powder with the grain diameter less than 2mm so as to meet the feeding requirement of a core grinding device; directly metering and conveying the powder raw materials to a core grinding device; the liquid grinding aid additive is metered and pumped to the core grinding device through a flow pump. The materials continuously enter the core grinding device at a grinding head of the core grinding device at a certain speed, the mill tail is discharged at the same speed as the feeding speed to obtain a mineral admixture finished product, namely the mineral admixture for commercial concrete, and the prepared mineral admixture for commercial concrete has the specific surface area of 600-1000 m 2 Per Kg; the fineness is less than or equal to 4 percent; median particle diameter (D) 50 ) 3-10 μm; the standard culture activity of the 28d colloidal sand reaches the S95 mineral powder level.
The feeding rate of the grinding head of the grinding device is the same as the discharging rate of the mill tail, and the feeding rate of raw materials is generally adjusted according to the discharging rate of the mill tail. The powder discharging rate of the mill tail is generally called as the powder discharging amount of the mill tail of the grinding device in 1 hour of production bench.
The invention obtains the median particle diameter (D) by adjusting the mass ratio of cement clinker, bulk industrial solid waste main raw material, auxiliary raw material and grinding aid additive and grinding and processing the raw materials by the grinding device 50 ) The mineral admixture for commercial concrete with technical parameters such as fineness, specific surface area and the like meeting the requirements obtains the optimal mass ratio range of cement clinker, bulk industrial solid waste main raw materials and auxiliary raw materials and grinding aid additives, and the technical parameters of each embodiment are shown in table 1.
TABLE 1 feed quality ratio, feed rate and technical parameters of the mill
The code, composition and ratio of the grinding aid additive in each of the above examples are shown in table 2.
TABLE 2 code, composition and proportioning table of grinding aid additives
In the above examples, the material composition and mass ratio of the bulk industrial solid waste main raw material and the auxiliary raw material are shown in table 3, for example.
TABLE 3 Material composition and Mass ratio of bulk Industrial solid waste Main raw Material and auxiliary raw Material
The size of the grinding device, the steel ball/steel forging gradation of each bin section in the mill and the dosage ratio in each embodiment are shown in table 4.
Table 4 size of the grinding device, steel ball/steel forging gradation of each bin section in the mill and the amount used in the embodiment
Application example 1
The performance of the mineral admixture for commercial concrete was tested using the mortar test. The test was carried out with reference to the method and the maintenance conditions specified in the national standard GB/T18046-2017 granulated blast furnace slag powder for use in cement, mortar and concrete. The raw material mixture ratio of the mortar test is 225g of conch 425 cement, 225g of mineral admixture, 1350g of standard sand and 225g of mixing water, the mixture is transferred into a standard curing box after being formed, the curing is carried out in the standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of more than or equal to 95%, and the mortar test data is shown in table 5.
TABLE 5 Standard curing Activity mortar test for ultra-fine mineral admixtures
As is clear from the data in Table 5, the mineral admixture for concrete of the present invention has a vibration extension in the mortar test slightly better than that of the commercial S95 ore powder, and significantly better than those reported in other documents or patents in comparative examples 1 and 2. Under the standard curing condition, the standard curing activity of 3d,7d and 28d of the formed mortar using the ultrafine mineral admixture is better than that of the comparative commercially available S95 mineral powder, comparative example 1 and comparative example 2. The mineral admixture for commercial concrete has a standard curing activity of 28d of 100% or more, and completely meets the technical requirement of standard curing activity of S95 mineral powder in national standard.
Application example 2
The performance of the mineral admixture for commercial concrete was tested using the concrete test. The concrete slump is tested according to the regulations in GB/T8076-2008 'concrete admixture', and the concrete test block is formed according to the regulations in GB/T50081-2002 'Standard test method for mechanical Properties of ordinary concrete'. The adopted cement is conch 425 cement, and the fly ash is secondary ash; the sand is medium sand with fineness modulus Mx =2.6, and the water content of the sand is 5%; the stones are continuous graded broken stones with the grain diameter of 5-20 mm, and the water content of the stones is 2%. Concrete with the strength grade of C30 has the volume weight of 2317Kg/m < 3 >, and the formula of the raw materials for the concrete test is shown in Table 6.
TABLE 6 proportioning table of concrete raw materials
Forming a concrete test block with the thickness of 100 multiplied by 100mm, and curing the concrete test block in a standard curing box under the curing condition of 20 +/-2 ℃ and the relative humidity of more than or equal to 95 percent. The concrete test data is shown in table 7.
Table 7 concrete test of admixtures
As is apparent from the data in Table 7, the slump and the slump of the concrete using the mineral admixture for commercial concrete according to the present invention are better than those of the commercial S95 ore powder and the mineral admixtures reported in other documents or patents of comparative examples 1 and 2, and the workability of the concrete is better. Under the standard curing condition, the strength of the concrete 7d and 28d using the ultrafine mineral admixture is obviously better than that of the comparative mineral powder, the comparative example 1 and the comparative example 2.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A preparation method of mineral admixture for commercial concrete is characterized by comprising the following steps: preparing cement clinker, bulk industrial solid waste and grinding aid additive according to a certain mass ratio by taking bulk industrial solid waste as a raw material, continuously adding the cement clinker, the bulk industrial solid waste and the grinding aid additive into a grinding device from a grinding head at a certain feeding rate, starting the grinding device for grinding, and discharging ground tailings at the same rate as the feeding rate to obtain a mineral admixture finished product, namely the mineral admixture for commercial concrete;
the bulk industrial solid waste comprises a main raw material with pozzolanic activity and an auxiliary raw material for exciting pozzolanic activity;
the mass percentage of the cement clinker, the main raw material and the auxiliary raw material is (5-15%) (80-90%) (5-10%);
the grinding aid additive comprises a commercially available early strength polycarboxylate superplasticizer and an alcohol amine ester, wherein the mass ratio of the early strength polycarboxylate superplasticizer to the alcohol amine ester is (1-2) to 1;
the dosage of the grinding aid additive is 0.05-0.15% of the total mass of the cement clinker and the bulk industrial solid waste.
2. The method of claim 1, wherein the mineral admixture for commercial concrete comprises: the cement clinker is commercially available cement clinker, is formed by firing clay, limestone and iron ore, and is irregular granular in shape.
3. The method of claim 1, wherein the mineral admixture for commercial concrete comprises: the main raw materials comprise one or a mixture of more of slag, lithium slag, raw ash, coarse ash, secondary ash, primary ash, silica fume and zeolite powder, and the auxiliary raw materials comprise alkaline calcium raw materials and sulfate-containing raw materials which are prepared according to any mass percentage.
4. The method of claim 3, wherein the mineral admixture for commercial concrete is prepared by: the alkaline calcareous raw material comprises one of limestone, calcium hydroxide, calcium nitrate and carbide slag, and the sulfate-containing raw material comprises one of gypsum stone, gypsum powder, desulfurized gypsum, phosphogypsum and alum stone powder.
5. The method of claim 1, wherein the mineral admixture for commercial concrete comprises: the alcohol amine esterified product comprises one of triethanolamine maleic anhydride monoester, diethanol monoisopropanolamine maleic anhydride monoester, triisopropanolamine maleic anhydride monoester, triethanolamine phosphate monoester, diethanol monoisopropanolamine phosphate monoester and triisopropanolamine phosphate monoester.
6. The method of claim 1, wherein the mineral admixture for commercial concrete comprises: the specific surface area of the mineral admixture for commercial concrete is 600-1000 m 2 Per Kg; the fineness is less than or equal to 4 percent; median particle diameter (D) 50 ) 3-10 μm; the standard culture activity of the 28d colloidal sand reaches the S95 mineral powder level.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116040974A (en) * | 2023-03-20 | 2023-05-02 | 解婧秋 | Method for preparing superfine powder cement admixture |
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| CN115893896A (en) * | 2022-11-28 | 2023-04-04 | 厦门兑泰新材料科技有限公司 | Full-solid waste-based concrete composite mineral admixture and preparation method thereof |
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