CN113003959A - Production process for preparing composite mineral admixture by utilizing concrete residues - Google Patents
Production process for preparing composite mineral admixture by utilizing concrete residues Download PDFInfo
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- CN113003959A CN113003959A CN202110229772.2A CN202110229772A CN113003959A CN 113003959 A CN113003959 A CN 113003959A CN 202110229772 A CN202110229772 A CN 202110229772A CN 113003959 A CN113003959 A CN 113003959A
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- concrete
- mineral admixture
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention belongs to the technical field of concrete residue treatment, and particularly relates to a production process for preparing a composite mineral admixture by using concrete residues remained in the process of producing commercial concrete, which comprises the following steps: drying and grinding the concrete residue slurry, compounding the concrete residue slurry with clinker, silica fume and mineral powder according to a certain proportion, preparing a composite mineral admixture by utilizing a multi-element compounding technology, and determining the optimal mixing ratio range of the mixing amount of each raw material in the composite mineral admixture through an orthogonal test. The process realizes the reutilization of waste slurry in the concrete production process, reduces the environmental pollution and the resource waste, and can also obtain social and economic benefits to a certain extent. The composite mineral admixture prepared by the invention can replace cement with large mixing amount, and greatly reduce the cement consumption; the recycled concrete prepared by the mineral admixture has good strength, and the 28d strength of the mortar can reach more than 95%; moreover, limestone resources and energy sources can be saved, and the emission of carbon dioxide is reduced.
Description
Technical Field
The invention belongs to the technical field of concrete residue treatment, and particularly relates to a production process for preparing a composite mineral admixture by using concrete residues remained in a commercial concrete production process.
Background
Currently, due to the rapid development of cities, the projects of rural transformation towns are continuously increased, the modern construction is continuously accelerated, a large amount of concrete is used in a large amount of construction, and the yield of the concrete is also continuously increased, thereby resulting in the increase of commercial concrete mixing stations (commercial mixing stations). The increase of the commercial mixing stations brings many advantages, but simultaneously, a large amount of residues are generated, and the large amount of residues are randomly discharged, thereby causing great pollution to the environment. The commercial mixing station needs to be cleaned in the process of producing concrete, a large amount of concrete residue waste slurry is generated when a mixing truck and a mixing unit are cleaned, the waste slurry contains substances such as admixture, cement and sand, and for the generated large amount of residue waste slurry, the links of treating wastes are omitted for reducing production cost by some small companies and construction personnel, the wastes are directly piled up in the open positions with less smoke in villages and the like, so that the environment pollution is caused, the land is occupied, and the utilization rate of the land is reduced.
In recent years, with the integration of environmental protection concepts in production and life of people, the recycling of residues is gradually realized in concrete mixing plants in China, and the development of residue recycling research requires long-term technical experience. Most mixing plants show randomness, lack of rigidity requirements, and insufficient research efforts when dealing with residues, eventually leading to unreasonable recycling of concrete residues. Experts and scholars at home and abroad carry out deep research in the field of construction waste recycled concrete, but the problem of treatment of residues generated in the concrete production process is not concerned by people at present.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a production process for preparing a composite mineral admixture by using concrete residues, which realizes the reutilization of waste slurry in the production process of concrete and reduces the environmental pollution and the resource waste. Waste slurry generated in the process of flushing a tank truck and a stirrer at a commercial concrete stirring station is dried and milled, and then is combined with various active mineral components to prepare the composite mineral admixture for concrete, and the prepared composite mineral admixture can be used as a gel material together with cement to prepare concrete.
The technical scheme of the invention is as follows:
a production process for preparing composite mineral admixture by utilizing concrete residue comprises the steps of drying and grinding concrete residue slurry, compounding the concrete residue slurry with clinker, silica fume and mineral powder according to a certain proportion, and preparing the composite mineral admixture by utilizing a multi-element compounding technology; the multi-element compounding means that the ground residue is mixed with clinker, silica fume and mineral powder in proportion to prepare green mineral admixture with high activity and good strength; the method specifically comprises the following steps:
(1) selecting concrete residue slurry: selecting and collecting concrete residue slurry with the liquid level below 10 cm;
(2) drying in a drying oven: drying the residue slurry immediately by using an oven;
(3) grinding and particle size detection: grinding the dried residues by a grinding machine, and detecting the granularity of a ground residue fine powder sample;
(4) determining the mixing amount of the composite mineral admixture: designing an orthogonal test according to the mixing amount of the finely ground residue fine powder and clinker, silica fume and mineral powder;
(5) determining the optimal mixing ratio range: and determining the optimal mixing ratio range of the mixing amount of each raw material in the composite mineral admixture.
Further, the grinding time in the step (3) is 10-60 s, and the particle size of the ground residue fine powder sample is detected by a laser particle size analyzer. Grinding the waste residues for 10s, 30s and 60s, detecting the granularity of the waste residues by using a laser particle sizer, wherein the longer the grinding time is, the smaller the granularity of the waste residues is, preferably, the grinding time is 60s, the average particle size (Dav) is 12.22 mu m, and the grinding time is equal to 1000-mesh molecular sieve according to the relation between the grinding time and the granularity, and the waste residues belong to ultrafine powder.
Further, the grinding time in the step (3) is 60s, and the average particle size of the ground residue fine powder is 12.22 μm.
Further, in the step (4), silica fume, clinker, mineral powder and total mixing amount are selected as factors, and a four-factor three-level orthogonal test is set; the total mixing amount refers to the total mixing amount of the silica fume, the clinker, the mineral powder and the residue fine powder.
Further, the optimal mixing proportion range of the mixing amount of each raw material in the composite mineral admixture determined in the step (5) is as follows: the mixing amount of the silica fume accounts for 2.5-5.0 percent of the total cementing material, the mineral powder accounts for 2.5-7.5 percent of the total cementing material, the clinker accounts for 2.5-7.5 percent of the total cementing material, and the composite mineral admixture accounts for 45-60 percent of the total cementing material.
Further, the raw materials of the prepared composite mineral admixture comprise concrete residue fine powder, silica fume, clinker and mineral powder; wherein, the mixing amount of the silica fume accounts for 2.5 to 5.0 percent of the total gelled material, the mineral powder accounts for 2.5 to 7.5 percent of the total gelled material, the clinker accounts for 2.5 to 7.5 percent of the total gelled material, and the composite mineral admixture accounts for 45 to 60 percent of the total gelled material.
Furthermore, the 28d strength of the mortar prepared by the composite mineral admixture can reach more than 95%.
The invention has the beneficial effects that:
(1) under the guidance of concrete material scientific theory, the concrete residue slurry taken from a commercial mixing station is solidified and then ground, and is compounded with other active mineral admixtures, namely clinker, silica fume, mineral powder and the like according to a certain proportion, a novel mineral admixture with high activity is prepared by utilizing a multi-element compounding technology and is doped into the concrete, so that macropores can be reduced, the hydration degree is higher after the concrete residue slurry is refined, pores are effectively filled, the compactness of the concrete is improved, cracks and harmful pores are reduced, the performance of the concrete in the actual service period is improved, the resource utilization of wastes is realized, the pollution waste of industrial wastes to environmental resources is reduced, and simultaneously, a certain degree of social and economic benefits can be obtained.
(2) The composite mineral admixture prepared by the invention can replace cement with large mixing amount, and greatly reduces the cement consumption; meanwhile, limestone resources and energy sources can be saved, and the emission of carbon dioxide is reduced; the recycled concrete prepared by the mineral admixture has good strength, and the 28d strength of the mortar can reach more than 95%.
Drawings
FIG. 1 is a flow chart of the production process provided by the present invention.
Detailed Description
The technical solutions of the present invention will be described in detail and fully with reference to the following specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and 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.
For a further understanding of the present invention, reference will now be made in detail to the following examples.
Examples
A production process for preparing a composite mineral admixture by utilizing concrete residues comprises the following specific steps:
(1) selecting concrete residue slurry: selecting and collecting concrete residue slurry with the liquid level below 10cm from a commercial mixing station, and simultaneously recording index data of each step;
(2) drying in a drying oven: drying the residue slurry immediately by using an oven;
(3) grinding and particle size detection:
grinding the dried residues by a grinding machine for 10s, 30s and 60s respectively, and detecting the particle size of the residue fine powder samples ground at different times by a laser particle size analyzer, wherein the longer the grinding time is, the smaller the particle size of the waste residues is; wherein the average particle size (Dav) of a ground sample with the grinding time of 60s is 12.22 mu m, is equivalent to a molecular sieve of 1000 meshes, and belongs to an ultrafine powder material; hence a milling time of 60s is preferred;
(4) determining the mixing amount of the composite mineral admixture:
according to the mixing amount of the ground residues, clinker, silica fume and mineral powder, taking the silica fume, the clinker, the mineral powder and the total mixing amount as four factors, respectively selecting different numerical values to combine, and setting a four-factor three-level orthogonal test;
the application of the orthogonal test method in this example is illustrated below by the analysis process of specific experimental data. Assuming that the total mixing amount, the clinker, the silica fume and the mineral powder are respectively a factor A, a factor B, a factor C and a factor D, and A, B, C, D take the following values: total incorporation (factor a): 45%, 50%, 60%; clinker blending amount (factor B): 2.5%, 5.0%, 7.5%; silica fume doping amount (factor C): 2.5%, 3.5%, 4.5%; mineral powder mixing amount (factor D): 2.5%, 5.0%, 7.5%. The parameter data combinations shown in table 1 are formed in the form of an original orthogonal table:
TABLE 1 orthogonal test design factor horizon
The mixing proportion of the cementing material and the sand in the orthogonal test is 1:3, wherein the level 1 of the factor A is 55% of cement admixture, and 45% of mineral admixture prepared by mixing residue fine powder; the level 2 is 50 percent of cement doping, 50 percent of mineral admixture prepared by mixing residue fine powder, the level 3 is 40 percent of cement doping, and 60 percent of mineral admixture prepared by mixing residue fine powder; the water-cement ratio is 0.5; the combination ratio of the orthogonal test groups is shown in Table 2:
TABLE 2 orthogonal test mix proportions
(5) Determining the optimal mixing ratio range:
tests shown in the following tables 3 and 4 are designed by taking compressive strength, flexural strength and activities at different ages as indexes, and the optimal mixing ratio range is obtained, namely, the silica fume mixing amount accounts for 2.5-5.0% of the total cementing material, the mineral powder accounts for 2.5-7.5% of the total cementing material, the clinker accounts for 2.5-7.5% of the total cementing material, and the composite mineral admixture accounts for 45-60% of the total cementing material.
Table 3 test block strength for orthogonal test set
As can be seen from the above Table 3, the strength test proves that the mortar prepared from the composite mineral admixture prepared from the residue can reach more than 95% at 28 d; the composite mineral admixture prepared by the method of the embodiment is used for producing recycled concrete, so that the self compactness of the concrete can be improved, cracks and harmful holes are reduced, and the service performance of the concrete is improved.
TABLE 4 Activity at different ages
| Experimental group | 3d | 7d | 28d |
| Z1 | 68.7％ | 74.5％ | 98.9％ |
| Z2 | 71.3％ | 79.6％ | 104.9％ |
| Z3 | 89.2％ | 95.7％ | 110.3％ |
| Z4 | 62.6％ | 69.8％ | 100.3％ |
| Z5 | 76.9％ | 82.4％ | 92.6％ |
| Z6 | 71.8％ | 89.0％ | 105.7％ |
| Z7 | 59.5％ | 65.9％ | 94.3％ |
| Z8 | 61.5％ | 67.1％ | 82.5％ |
| Z9 | 67.2％ | 73.3％ | 91.4％ |
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. A production process for preparing a composite mineral admixture by using concrete residues is characterized in that concrete residue slurry is dried and then ground, and is compounded with clinker, silica fume and mineral powder according to a certain proportion, and the composite mineral admixture is prepared by using a multi-element compounding technology; the method specifically comprises the following steps:
(1) selecting concrete residue slurry: selecting and collecting concrete residue slurry with the liquid level below 10 cm;
(2) drying in a drying oven: drying the residue slurry immediately by using an oven;
(3) grinding and particle size detection: grinding the dried residues by a grinding machine, and detecting the granularity of a ground residue fine powder sample;
(4) determining the mixing amount of the composite mineral admixture: designing an orthogonal test according to the mixing amount of the finely ground residue fine powder and clinker, silica fume and mineral powder;
(5) determining the optimal mixing ratio range: and determining the optimal mixing ratio range of the mixing amount of each raw material in the composite mineral admixture.
2. The production process according to claim 1, wherein the grinding time in the step (3) is 10-60 s, and the particle size of the ground residue fine powder sample is detected by a laser particle sizer.
3. The production process according to claim 2, wherein the milling time of the step (3) is 60s, and the average particle size of the residue fine powder after milling is 12.22 μm.
4. The production process according to claim 1, wherein in the step (4), silica fume, clinker, mineral powder and total mixing amount are selected as factors, and a four-factor three-level orthogonal test is set; the total mixing amount refers to the total mixing amount of the silica fume, the clinker, the mineral powder and the residue fine powder.
5. The production process according to claim 1, wherein the optimal mixing ratio range of the mixing amount of each raw material in the composite mineral admixture determined in the step (5) is as follows: the mixing amount of the silica fume accounts for 2.5-5.0 percent of the total cementing material, the mineral powder accounts for 2.5-7.5 percent of the total cementing material, the clinker accounts for 2.5-7.5 percent of the total cementing material, and the composite mineral admixture accounts for 45-60 percent of the total cementing material.
6. The complex mineral admixture prepared by the production process according to the claim 1 to 5, wherein the raw material composition of the complex mineral admixture comprises concrete residue fine powder, silica fume, clinker and mineral powder; wherein, the mixing amount of the silica fume accounts for 2.5 to 5.0 percent of the total gelled material, the mineral powder accounts for 2.5 to 7.5 percent of the total gelled material, the clinker accounts for 2.5 to 7.5 percent of the total gelled material, and the composite mineral admixture accounts for 45 to 60 percent of the total gelled material.
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| CN202110229772.2A CN113003959A (en) | 2021-03-02 | 2021-03-02 | Production process for preparing composite mineral admixture by utilizing concrete residues |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113772983A (en) * | 2021-10-18 | 2021-12-10 | 江西科技学院 | Device and production process for preparing composite mineral admixture by utilizing concrete residues |
| CN115196918A (en) * | 2022-07-08 | 2022-10-18 | 青岛金磐石新型建材有限公司 | Pump concrete prepared from concrete residues and preparation method thereof |
-
2021
- 2021-03-02 CN CN202110229772.2A patent/CN113003959A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113772983A (en) * | 2021-10-18 | 2021-12-10 | 江西科技学院 | Device and production process for preparing composite mineral admixture by utilizing concrete residues |
| CN115196918A (en) * | 2022-07-08 | 2022-10-18 | 青岛金磐石新型建材有限公司 | Pump concrete prepared from concrete residues and preparation method thereof |
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Application publication date: 20210622 |
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