CN115124296A - Modified recycled brick aggregate mortar and preparation method thereof - Google Patents
Modified recycled brick aggregate mortar and preparation method thereof Download PDFInfo
- Publication number
- CN115124296A CN115124296A CN202110311239.0A CN202110311239A CN115124296A CN 115124296 A CN115124296 A CN 115124296A CN 202110311239 A CN202110311239 A CN 202110311239A CN 115124296 A CN115124296 A CN 115124296A
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- Prior art keywords
- mortar
- aggregate
- fine aggregate
- recycled
- water
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 49
- 239000011449 brick Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 39
- 238000003756 stirring Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004568 cement Substances 0.000 claims abstract description 23
- 239000004576 sand Substances 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000012216 screening Methods 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 12
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 9
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 9
- 238000010521 absorption reaction Methods 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000011398 Portland cement Substances 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 5
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 5
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 5
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000011469 building brick Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 15
- 238000010276 construction Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 7
- 238000007385 chemical modification Methods 0.000 abstract description 2
- 230000003245 working effect Effects 0.000 abstract 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/04—Portland cements
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses modified recycled brick aggregate mortar and a preparation method thereof, and is characterized in that mortar with different strength grades is prepared from the following materials in percentage by mass: 13.3-18.6% of cement, 38.0-40.5% of recycled fine aggregate, 25.3-27.0% of natural sand and 18.1-19.3% of water, wherein the dosage of the admixture is 0.1% of the total mass of the cement and the fine aggregate, the recycled brick fine aggregate is mainly formed by adding a small part of waste concrete fine aggregate after waste broken bricks are subjected to crushing, screening, cleaning, drying and other processes, wherein the content of the waste bricks accounts for more than 60%, the particle composition is adjusted, the compressive strength is enhanced, and the water absorption is reduced. The mortar is obtained by soaking the recycled brick fine aggregate in 10% sodium sulfate solution and then treating the recycled brick fine aggregate by a chemical modification method of secondary stirring preparation, so that the mechanical property and the working property of the mortar are improved, the cost is reduced, the water retention property and the cohesiveness of the mortar are enhanced by the admixture, the application of the waste brick in the mortar is greatly improved, the construction waste resource is fully utilized, the natural sand resource is saved, and the greening degree of the construction mortar is improved.
Description
Technical Field
The invention relates to the technical field of building engineering materials, in particular to modified recycled brick aggregate mortar and a preparation method thereof.
Background
Along with the acceleration of the pace of urbanization construction of various countries, a large amount of former brick-concrete structures are removed by transformation of old cities in recent years, so that more and more construction wastes mainly comprising waste bricks are generated, and a series of natural resources, energy and environmental protection problems are caused by the generation, stacking and landfill of a large amount of construction wastes. In the face of the problems caused by construction waste and the severe situation of the shortage of land resources and sand resources, the treatment and the reutilization of the construction waste are receiving more and more attention.
However, most of the construction waste in China is used for cast-in-place concrete, but the requirement of concrete on recycled aggregate is high, and the recycled aggregate with low content of impurities such as broken bricks and small particle size cannot be used for recycled concrete, so that the utilization rate of the construction waste is not high, and the research and production of the construction waste applied to mortar are still in a starting stage. Compared with natural aggregate, the recycled fine aggregate has the defects of high porosity, high water absorption, high crushing index and the like, and when the recycled fine aggregate is applied to mortar, the indexes of mechanical property, working performance, durability and the like are much lower than those of the mortar prepared by the natural aggregate, so that the utilization rate of the recycled fine aggregate is not high, and the utilization of waste bricks is limited.
Disclosure of Invention
According to the technical problems, the modified recycled brick aggregate mortar and the preparation method thereof are provided. The invention utilizes the waste broken bricks to be mixed with a small part of waste concrete regenerated fine aggregate after being treated by the processes of crushing, screening, cleaning, drying and the like, and the regenerated fine aggregate obtained by improving the performance of the waste broken bricks through a chemical method is used for replacing part of natural sand to prepare mortar, and the adopted technical means are as follows:
the mortar with different strength grades is prepared from the following materials in percentage by mass: 13.3 to 18.6 percent of cement, 38.0 to 40.5 percent of recycled fine aggregate, 25.3 to 27.0 percent of natural sand and 18.1 to 19.3 percent of water, wherein the dosage of the admixture is 0.1 percent of the total mass of the cement and the fine aggregate. The regenerated fine aggregate is mainly prepared by crushing, screening, cleaning, drying and other processes of the waste broken bricks of the construction wastes, screening out aggregate with the grain size of not more than 4.75mm, and simultaneously doping a small part of the regenerated fine aggregate of the waste concrete, thereby improving the compressive strength, reducing the water absorption, adjusting the grain composition, and ensuring that the content of the waste bricks accounts for more than 60 percent.
Preferably, the method for modifying the recycled fine aggregate comprises the steps of soaking the recycled fine aggregate in a 10% sodium sulfate solution for 20min, then soaking and stirring for 5min-10min until no bubbles are generated, standing and precipitating for 1h, washing with clear water, and then placing in a ventilated place for natural drying in the shade, so that the stress performance and the working performance of the recycled fine aggregate are improved.
Preferably, the admixture is hydroxypropyl methyl cellulose, so that the water retention and cohesiveness of the mortar are enhanced.
Preferably, the natural sand has a bulk density of 1320kg/m3, an apparent density of 2532kg/m3, and a particle size distribution of 2.3.
Preferably, the recycled fine aggregate has a bulk density of 1250kg/m3, an apparent density of 2410kg/m3 and a fineness modulus of 2.4.
Preferably, the cement is ordinary portland cement 32.5.
Preferably, the preparation method of the modified recycled brick aggregate mortar comprises the following steps: and (3) preparing the mortar by adopting secondary stirring, adding 50% of water according to the water-cement ratio, stirring for 30s at a low speed, stirring for 10s at a high speed, adding the rest water, stirring for 30s at a low speed, stirring for 20s at a high speed, and stirring for 90s at a low speed.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the recycled fine aggregate is mainly composed of waste broken bricks, a small part of waste concrete fine aggregate is doped, the particle composition is adjusted, the compressive strength is enhanced, the water absorption rate is reduced, the content of the waste broken bricks is more than 60%, the application of the waste bricks in mortar is greatly improved, the construction waste resources are fully utilized, the great significance is provided for permanently saving natural sand resources and utilizing the construction waste in full resources to reduce the pollution of solid waste to the environment, and the greening degree of the construction mortar is improved.
2. The chemical modification method of the invention is soaking treatment by 10% sodium sulfate solution. The sodium sulfate solution is utilized to repair the self fine cracks of the aggregate, the self performance of the recycled fine aggregate is improved, and after the mortar is prepared, the sodium sulfate participates in the hydration process of the cement, so that the reaction is promoted to form crystals in the fine cracks, and the aggregate and the slurry are more compact. The mortar is prepared by secondary stirring, so that the stress performance and the working performance of the mortar are improved.
3. The admixture and the improvement method selected by the invention are simple and convenient to operate and low in cost, and can maximize the utilization rate of the recycled fine aggregate to a certain extent.
Detailed Description
Example 1
Modified recycled brick aggregate mortar comprises the following components in percentage by mass: 13.3% of cement, 40.5% of recycled brick fine aggregate, 27% of natural sand and 19.3% of water, 220 parts of cement, 672 parts of recycled fine aggregate, 448 parts of natural sand and 320 parts of water are weighed to prepare M5 modified recycled brick aggregate mortar, wherein 1.3 parts of admixture is taken.
The recycled fine aggregate is mainly prepared by crushing, screening, cleaning, drying and other processes of building waste broken bricks, screening aggregate with the particle size of not more than 4.75mm, and simultaneously doping a small part of recycled fine aggregate of waste concrete, so that the compressive strength of the recycled fine aggregate is improved, the water absorption is reduced, the grain composition is adjusted, and the content of the waste bricks accounts for more than 60%.
The method for modifying the recycled fine aggregate comprises the steps of soaking the recycled fine aggregate in a 10% sodium sulfate solution for 20min, soaking and stirring for 5min-10min until no bubbles are generated, standing and precipitating for 1h, washing with clear water, and naturally drying in the shade.
The admixture is hydroxypropyl methyl cellulose, and the water retention property and the cohesiveness of the mortar are enhanced.
The bulk density of the natural sand is 1320kg/m3, the apparent density is 2532kg/m3, and the particle size distribution is 2.3.
The bulk density of the recycled fine aggregate is 1120kg/m3, the apparent density is 2410kg/m3, and the fineness modulus is 2.4.
The cement is P.O32.5 ordinary portland cement.
The preparation method of the modified recycled brick aggregate mortar comprises the following steps: and (3) preparing the mortar by adopting secondary stirring, adding 50% of water according to the water-cement ratio, stirring for 30s at a low speed, stirring for 10s at a high speed, adding the rest water, stirring for 30s at a low speed, stirring for 20s at a high speed, and stirring for 90s at a low speed.
Example 2
Modified recycled brick aggregate mortar comprises the following components in percentage by mass: 16.8 percent of cement, 38.8 percent of recycled brick fine aggregate, 25.9 percent of natural sand and 18.5 percent of water, 290 parts of cement, 672 parts of recycled fine aggregate, 448 parts of natural sand and 320 parts of water are weighed
Preparing M10 modified recycled brick aggregate mortar, wherein 1.4 parts of admixture is taken.
The recycled fine aggregate is mainly prepared by crushing, screening, cleaning, drying and other processes of building waste broken bricks, screening aggregate with the particle size of not more than 4.75mm, and simultaneously doping a small part of recycled fine aggregate of waste concrete, so that the compressive strength of the recycled fine aggregate is improved, the water absorption is reduced, the grain composition is adjusted, and the content of the waste bricks accounts for more than 60%.
The method for modifying the recycled fine aggregate comprises the steps of soaking the recycled fine aggregate in a 10% sodium sulfate solution for 20min, soaking and stirring for 5min-10min until no bubbles are generated, standing and precipitating for 1h, washing with clear water, and naturally drying in the shade.
The admixture is hydroxypropyl methyl cellulose, and the water retention property and the cohesiveness of the mortar are enhanced.
The bulk density of the natural sand is 1320kg/m3, the apparent density is 2532kg/m3, and the particle size distribution is 2.3.
The bulk density of the recycled fine aggregate is 1120kg/m3, the apparent density is 2410kg/m3, and the fineness modulus is 2.4.
The cement is P.O32.5 ordinary portland cement.
The preparation method of the modified recycled brick aggregate mortar comprises the following steps: and (3) stirring for the second time, namely adding 50% of water according to the water-cement ratio, stirring for 30s at a low speed, stirring for 10s at a high speed, adding the rest water, stirring for 30s at a low speed, stirring for 20s at a high speed, and stirring for 90s at a low speed.
Example 3
Modified recycled brick aggregate mortar comprises the following components in percentage by mass: 18.6% of cement, 38% of recycled brick fine aggregate, 25.3% of natural sand and 18.1% of water, wherein 1.5 parts of admixture is prepared by weighing 330% of cement, 672% of recycled fine aggregate, 448% of natural sand and 320% of water and preparing M15 modified recycled brick aggregate mortar.
The recycled fine aggregate is mainly prepared by crushing, screening, cleaning, drying and other processes of building waste broken bricks, screening aggregate with the particle size of not more than 4.75mm, and simultaneously doping a small part of recycled fine aggregate of waste concrete, so that the compressive strength of the recycled fine aggregate is improved, the water absorption is reduced, the grain composition is adjusted, and the content of the waste bricks accounts for more than 60%.
The method for modifying the recycled fine aggregate comprises the steps of soaking the recycled fine aggregate in a 10% sodium sulfate solution for 20min, soaking and stirring for 5min-10min until no bubbles are generated, standing and precipitating for 1h, washing with clear water, and naturally drying in the shade.
The admixture is hydroxypropyl methyl cellulose, and the water retention property and the cohesiveness of the mortar are enhanced.
The bulk density of the natural sand is 1320kg/m3, the apparent density is 2532kg/m3, and the particle size distribution is 2.3.
The bulk density of the recycled fine aggregate is 1120kg/m3, the apparent density is 2410kg/m3, and the fineness modulus is 2.4.
The cement is P.O32.5 ordinary portland cement.
The preparation method of the modified recycled brick aggregate mortar comprises the following steps: and (3) stirring for the second time, namely adding 50% of water according to the water-cement ratio, stirring for 30s at a low speed, stirring for 10s at a high speed, adding the rest water, stirring for 30s at a low speed, stirring for 20s at a high speed, and stirring for 90s at a low speed.
Claims (8)
1. The modified recycled brick aggregate mortar and the preparation method thereof are characterized in that mortar with different strength grades is prepared from the following materials in percentage by mass: 13.3 to 18.6 percent of cement, 38.0 to 40.5 percent of recycled fine aggregate, 25.3 to 27.0 percent of natural sand and 18.1 to 19.3 percent of water, wherein the dosage of the admixture is 0.1 percent of the total mass of the cement and the fine aggregate.
2. The modified recycled brick aggregate mortar and the preparation method thereof according to claim 1, wherein the recycled fine aggregate is mainly prepared by crushing, screening, cleaning and drying the waste building bricks, screening out the aggregate with the particle size of not more than 4.75mm, and simultaneously adding a small part of the recycled fine aggregate of waste concrete, thereby improving the compressive strength, reducing the water absorption, adjusting the particle composition, and ensuring that the content of the waste bricks is more than 60%.
3. The modified recycled brick aggregate mortar and the preparation method thereof according to claim 1, wherein the modified recycled fine aggregate is prepared by soaking recycled fine aggregate in 10% sodium sulfate solution for 20min, then soaking and stirring for 5min-10min until no bubbles are generated, standing and precipitating for 1h, washing with clear water, and naturally drying in the shade in a ventilated place to improve the stress performance and the working performance.
4. The modified recycled brick aggregate mortar and the preparation method thereof according to claim 1, wherein the admixture is hydroxypropyl methylcellulose, so that the water retention and cohesiveness of the mortar are enhanced, and the strength of the mortar is effectively improved.
5. The modified recycled brick aggregate mortar of claim 1, wherein the natural sand has a bulk density of 1320kg/m3, an apparent density of 2532kg/m3 and a particle size distribution of 2.3.
6. The modified recycled brick-aggregate mortar and the preparation method thereof according to claim 1, wherein the recycled fine aggregate has a bulk density of 1250kg/m3, an apparent density of 2410kg/m3 and a fineness modulus of 2.4.
7. The modified recycled brick aggregate mortar and the preparation method thereof according to claim 1, wherein the cement is P.O32.5 Portland cement.
8. The mortar of modified recycled brick aggregate according to any of claims 1 to 7, wherein the mortar is prepared by stirring twice, wherein 50% of water is added according to the water-cement ratio, and the stirring is performed for 30s at a low speed, 10s at a high speed, the remaining amount of water is added, 30s at a low speed, 20s at a high speed, and 90s at a low speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110311239.0A CN115124296A (en) | 2021-03-24 | 2021-03-24 | Modified recycled brick aggregate mortar and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110311239.0A CN115124296A (en) | 2021-03-24 | 2021-03-24 | Modified recycled brick aggregate mortar and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115124296A true CN115124296A (en) | 2022-09-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110311239.0A Pending CN115124296A (en) | 2021-03-24 | 2021-03-24 | Modified recycled brick aggregate mortar and preparation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN115124296A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10316460A (en) * | 1997-05-16 | 1998-12-02 | Ohbayashi Corp | Production of regenerated aggregate and production of concrete containing regenerated aggregate |
| CN105418011A (en) * | 2015-11-24 | 2016-03-23 | 中建商品混凝土西安有限公司 | Wet-mixed mortar doped with recycled fine aggregate |
| KR101860376B1 (en) * | 2017-01-11 | 2018-05-23 | 조선대학교산학협력단 | Mortar composition |
| CN109836101A (en) * | 2019-04-01 | 2019-06-04 | 安阳工学院 | A kind of discarded concrete prepares the match ratio and its method of M20 dry powder and mortar |
| CN110922079A (en) * | 2019-11-13 | 2020-03-27 | 西安理工大学 | Method for reinforcing quality of recycled coarse aggregate by using sulfate solution |
| CN111792891A (en) * | 2020-06-01 | 2020-10-20 | 南通德嘉节能保温材料有限公司 | Dry-mixed common masonry mortar based on construction solid waste recycled fine aggregate |
-
2021
- 2021-03-24 CN CN202110311239.0A patent/CN115124296A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10316460A (en) * | 1997-05-16 | 1998-12-02 | Ohbayashi Corp | Production of regenerated aggregate and production of concrete containing regenerated aggregate |
| CN105418011A (en) * | 2015-11-24 | 2016-03-23 | 中建商品混凝土西安有限公司 | Wet-mixed mortar doped with recycled fine aggregate |
| KR101860376B1 (en) * | 2017-01-11 | 2018-05-23 | 조선대학교산학협력단 | Mortar composition |
| CN109836101A (en) * | 2019-04-01 | 2019-06-04 | 安阳工学院 | A kind of discarded concrete prepares the match ratio and its method of M20 dry powder and mortar |
| CN110922079A (en) * | 2019-11-13 | 2020-03-27 | 西安理工大学 | Method for reinforcing quality of recycled coarse aggregate by using sulfate solution |
| CN111792891A (en) * | 2020-06-01 | 2020-10-20 | 南通德嘉节能保温材料有限公司 | Dry-mixed common masonry mortar based on construction solid waste recycled fine aggregate |
Non-Patent Citations (2)
| Title |
|---|
| 侯运炳，魏书祥，王炳文著: "《尾砂固结排放技术》", 30 April 2016 * |
| 宋福申等: "建筑垃圾再生砖砂的性能特征研究", 《河南建材》 * |
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