CN110818347A - High-toughness cement-based composite material based on construction waste micro powder and preparation method thereof - Google Patents
High-toughness cement-based composite material based on construction waste micro powder and preparation method thereof Download PDFInfo
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- CN110818347A CN110818347A CN201911055492.3A CN201911055492A CN110818347A CN 110818347 A CN110818347 A CN 110818347A CN 201911055492 A CN201911055492 A CN 201911055492A CN 110818347 A CN110818347 A CN 110818347A
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- cement
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B28/06—Aluminous cements
-
- 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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
-
- 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 high-toughness cement-based composite material based on construction waste micro powder and a preparation method thereof, wherein the high-toughness cement-based composite material comprises the following components in percentage by mass: 14-28% of construction waste micro powder with particle grading, 15-26% of water, 24-33% of cement, 13-20% of quartz sand, 11-18% of fly ash, 1-2% of polymer fiber, 2-5% of micro-beads, 0.3-1% of additive, 0-2% of defoaming agent and 0-0.3% of cellulose ether. According to the invention, the construction waste micro powder is used for replacing part of cement materials, so that the high-toughness cement-based composite material with excellent performance can be prepared, the resource recycling of the construction waste can be realized, and the cost of the high-toughness cement-based composite material is reduced. The high-toughness cement-based composite material prepared by the invention has a self-maintenance function based on the high water absorption characteristic of the construction waste micro powder, and can reduce the manual maintenance cost.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a high-toughness cement-based composite material based on construction waste micro powder and a preparation method thereof.
Background
The high-toughness cement-based composite material has the characteristics of strain hardening and multi-joint cracking, and has excellent performances in the aspects of safety, durability, applicability and the like. In addition, the high-toughness cement-based composite material can well overcome various defects caused by brittleness and weak stretchability of the traditional concrete, and has wide application prospects in the fields of cement product development, bridge and road construction, structural reinforcement and the like.
With the rapid development of urbanization and construction industry in China, a large amount of construction waste can be generated in the building construction and demolition processes, large-area land resources can be occupied, and the surrounding environment can be polluted. Therefore, the high-toughness cement-based composite material is prepared by performing primary crushing, secondary crushing, grinding, powder selecting, screening and grading treatment on the construction waste such as the waste bricks and the waste concrete and replacing part of the cement material, so that the resource recycling of the construction waste can be realized, a large amount of cement materials can be saved, and the cost of the high-toughness cement-based composite material is reduced. The construction waste micro powder also has the characteristic of high water absorption rate, and the high-toughness cement-based composite material based on the construction waste micro powder has a self-maintenance function and can reduce the manual maintenance cost.
Disclosure of Invention
Aiming at the technical problems, the invention provides a high-toughness cement-based composite material based on construction waste micro powder and a preparation method thereof, which not only can realize resource recycling of construction waste, but also can reduce cost.
In order to achieve the purpose, the invention adopts the technical scheme that: the high-toughness cement-based composite material based on the construction waste micro powder comprises the following components in percentage by mass: 14-28% of construction waste micro powder with particle grading, 14-24% of water, 30-38% of cement, 13-20% of quartz sand, 5-10% of fly ash, 1-2% of polymer fiber, 2-5% of micro-bead, 0.3-1% of additive, 0-2% of defoaming agent and 0-0.3% of cellulose ether.
The further technical scheme is that the material comprises the following components in percentage by mass: 20% of construction waste micro powder with particle grading, 18% of water, 32% of cement, 15% of quartz sand, 8% of fly ash, 2% of polymer fiber, 3.5% of micro beads, 0.4% of additive, 1% of defoaming agent and 0.1% of cellulose ether.
The further technical scheme is that the construction waste micro powder is prepared by performing primary crushing, secondary crushing, grinding, powder selection, screening and grading on construction waste such as waste bricks, waste concrete and the like, the maximum particle size of the construction waste micro powder is not more than 0.15mm, and the specific surface area of the construction waste micro powder is preferably more than 650m2/kg and a maximum particle size of not more than 0.075 mm.
The further technical scheme is that the cement is one of portland cement, aluminate cement and magnesium phosphate cement, and preferably is portland cement.
The polymer fiber is one or two or more of polypropylene fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber and aramid fiber, the fiber length is not less than 5mm, and the polymer fiber is preferably one or two of the polyacrylonitrile fiber and the polyvinyl alcohol fiber.
The further technical scheme is that the water reducing agent is a naphthalene-based or polycarboxylic acid-based high-efficiency water reducing agent, and preferably a polycarboxylic acid-based high-efficiency water reducing agent.
The further technical scheme is that the defoaming agent is one of organic silicon defoaming agents, polyether defoaming agents, fatty acids and phosphate ester defoaming agents, and preferably polyether compounds.
The further technical scheme is that the fly ash is I-grade fly ash.
The preparation method of the high-toughness cement-based composite material based on the construction waste micro powder comprises the following steps:
(2) weighing the building garbage micro powder, the cement, the fly ash, the microbeads and the cellulose ether which are in particle grading according to the mass percentage of the raw materials, adding the materials into a stirrer, and stirring the materials at a low speed for 2 to 3 minutes until the materials are uniform;
(2) weighing an additive, a defoaming agent and water according to a proportion, dissolving the additive and the defoaming agent in the water, pouring the solution into a stirrer, and stirring the solution at a low speed for 2 to 3 minutes to form uniform cement paste;
(3) weighing polymer fibers, adding the fibers into the cement slurry, stirring at a low speed for 2-3 minutes, and then stirring at a high speed for 1-2 minutes until the fibers are uniformly dispersed in the slurry;
(4) and pouring the stirred slurry into a mold for molding to obtain the high-toughness cement-based composite material product based on the construction waste micro powder.
The invention has the following advantages:
(1) the high-toughness cement-based composite material is prepared by replacing part of cement materials with construction wastes such as waste bricks and waste concrete after primary crushing, secondary crushing, powder selection, screening and grading treatment, so that the resource recycling of the construction wastes can be realized, a large amount of cement materials can be saved, and the cost of the high-toughness cement-based composite material is reduced;
(2) the construction waste micro powder also has the characteristic of high water absorption rate, and the high-toughness cement-based composite material based on the construction waste micro powder has a self-maintenance function and can reduce the manual maintenance cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The high-toughness cement-based composite material based on the construction waste micro powder comprises the following components in percentage by mass: 20% of construction waste micro powder with particle grading, 18% of water, 32% of portland cement, 15% of quartz sand, 8% of I-grade fly ash, 2% of polyvinyl alcohol fiber, 3.5% of microbeads, 0.4% of polycarboxylic acid water reducing agent, 1% of polyether defoamer and 0.1% of cellulose ether.
The preparation method comprises the following steps:
(1) weighing the building garbage micro powder with particle size distribution, portland cement, I-grade fly ash, micro-beads and cellulose ether according to the mass percentage of the raw materials, adding the raw materials into a stirrer, and stirring the mixture at a low speed for 3 minutes until the mixture is uniform;
(2) weighing a polycarboxylic acid water reducer, a polyether defoaming agent and water according to a proportion, dissolving the water reducer and the defoaming agent in the water, pouring the water reducer and the defoaming agent into a stirrer, and stirring at a low speed for 3 minutes to form uniform cement paste;
(3) weighing polyvinyl alcohol fibers, adding the fibers into the cement paste, stirring at a low speed for 3 minutes, and then stirring at a high speed for 2 minutes until the fibers are uniformly dispersed in the paste;
(4) and pouring the stirred slurry into a mold for molding to obtain the high-toughness cement-based composite material product based on the construction waste micro powder.
Example 2
The high-toughness cement-based composite material based on the construction waste micro powder comprises the following components in percentage by mass: the components by mass percent are as follows: 24% of construction waste micro powder with particle grading, 20% of water, 34% of sulphoaluminate cement, 17% of quartz sand, 6% of grade II fly ash, 2.5% of polyacrylonitrile fiber, 5% of micro-beads, 0.5% of naphthalene water reducer, 0.8% of organosilicon defoamer and 0.2% of cellulose ether.
The preparation method comprises the following steps:
(1) weighing the building garbage micro powder with particle size distribution, sulphoaluminate cement, II-grade fly ash, micro-beads and cellulose ether according to the mass percentage of the raw materials, adding the materials into a stirrer, and stirring the materials at a low speed for 2 minutes until the materials are uniform;
(2) weighing a naphthalene water reducer, a silicone defoaming agent and water according to a proportion, dissolving the water reducer and the defoaming agent in the water, pouring the water reducer and the defoaming agent into a stirrer, and stirring at a low speed for 3 minutes to form uniform cement paste;
(3) weighing polyacrylonitrile fibers, adding the fibers into the cement slurry, stirring at a low speed for 2 minutes, and then stirring at a high speed for 2 minutes until the fibers are uniformly dispersed in the slurry;
(4) and pouring the stirred slurry into a mold for molding to obtain the high-toughness cement-based composite material product based on the construction waste micro powder.
Example 3
The high-toughness cement-based composite material based on the construction waste micro powder comprises the following components in percentage by mass: the components by mass percent are as follows: 18% of construction waste micro powder with particle grading, 19% of water, 33% of magnesium phosphate cement, 13% of quartz sand, 10% of I-grade fly ash, 3% of aramid fiber, 4% of micro beads, 0.3% of polycarboxylic acid water reducing agent, 0.5% of fatty acid defoaming agent and 0.2% of cellulose ether.
The preparation method comprises the following steps:
(1) weighing the building garbage micro powder with particle size distribution, magnesium phosphate cement, I-grade fly ash, micro-beads and cellulose ether according to the mass percentage of the raw materials, adding the raw materials into a stirrer, and stirring the mixture at a low speed for 3 minutes until the mixture is uniform;
(2) weighing a polycarboxylic acid water reducing agent, a fatty acid defoaming agent and water according to a proportion, dissolving the water reducing agent and the defoaming agent in the water, pouring the water reducing agent and the defoaming agent into a stirrer, and stirring at a low speed for 3 minutes to form uniform cement paste;
(3) weighing aramid fibers, adding the fibers into the cement slurry, stirring at a low speed for 2 minutes, and then stirring at a high speed for 3 minutes until the fibers are uniformly dispersed in the slurry;
(4) and pouring the stirred slurry into a mold for molding to obtain the high-toughness cement-based composite material product based on the construction waste micro powder.
And (3) performance detection: the mechanical properties and shrinkage rate of the low self-shrinkage high-toughness cement-based composite material based on the particle matching technology are tested by using test pieces of 40mm multiplied by 160mm, and the test pieces are shown in table 1.
Table 1 the examples have the following test items and results:
| detecting items | Example 1 | Example 2 | Example 3 |
| 7d compressive Strength (MPa) | 89.3 | 88.7 | 90.5 |
| 28d compressive Strength (MPa) | 102.1 | 98.7 | 105.4 |
| 7d breaking strength (MPa) | 17.9 | 16.9 | 17.5 |
| 28d breaking strength (MPa) | 24.9 | 20.5 | 21.3 |
In conclusion, compared with the prior art, the high-toughness cement-based composite material based on the construction waste micropowder can be used for preparing the high-toughness cement-based composite material with excellent performance, can realize resource recycling of the construction waste, saves a large amount of cement materials and reduces the cost of the high-toughness cement-based composite material. The high-toughness cement-based composite material prepared by the invention has a self-maintenance function based on the high water absorption characteristic of the construction waste micro powder, and can reduce the manual maintenance cost.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (9)
1. The high-toughness cement-based composite material based on the construction waste micro powder is characterized by comprising the following components in percentage by mass: 14-28% of construction waste micro powder with particle grading, 14-24% of water, 30-38% of cement, 13-20% of quartz sand, 5-10% of fly ash, 1-2% of polymer fiber, 2-5% of micro-bead, 0.3-1% of additive, 0-2% of defoaming agent and 0-0.3% of cellulose ether.
2. The high-toughness cement-based composite material based on construction waste micropowder according to claim 1, is characterized by comprising the following components in percentage by mass: 20% of construction waste micro powder with particle grading, 18% of water, 32% of cement, 15% of quartz sand, 8% of fly ash, 2% of polymer fiber, 3.5% of micro beads, 0.4% of additive, 1% of defoaming agent and 0.1% of cellulose ether.
3. A high-toughness cement-based composite material based on construction waste micropowder according to claim 1 or 2, characterized in that the construction waste micropowder is prepared from construction waste such as waste bricks and waste concrete by primary crushing, secondary crushing, grinding, selecting, screening and grading, and the maximum particle size of the construction waste micropowder is not more than 0.15 mm.
4. The high-toughness cement-based composite material based on construction waste micropowder of claim 3, characterized in that: the cement is one of portland cement, aluminate cement and magnesium phosphate cement.
5. The high-toughness cement-based composite material based on construction waste micropowder of claim 4, characterized in that: the polymer fiber is one or a combination of two or more of polypropylene fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber and aramid fiber, and the fiber length is not less than 5 mm.
6. The high-toughness cement-based composite material based on construction waste micropowder of claim 5, characterized in that: the water reducing agent is a naphthalene-based or polycarboxylic acid-based high-efficiency water reducing agent.
7. The high-toughness cement-based composite material based on construction waste micropowder of claim 6, characterized in that: the defoaming agent is one of organic silicon defoaming agents, polyether defoaming agents, fatty acids defoaming agents and phosphate defoaming agents.
8. The high-toughness cement-based composite material based on construction waste micropowder according to claim 7, characterized in that: the fly ash is I-grade fly ash.
9. The preparation method of the high-toughness cement-based composite material based on the construction waste micro powder is characterized by comprising the following steps of:
(1) weighing the building garbage micro powder, the cement, the fly ash, the microbeads and the cellulose ether which are in particle grading according to the mass percentage of the raw materials, adding the materials into a stirrer, and stirring the materials at a low speed for 2 to 3 minutes until the materials are uniform;
(2) weighing an additive, a defoaming agent and water according to a proportion, dissolving the additive and the defoaming agent in the water, pouring the solution into a stirrer, and stirring the solution at a low speed for 2 to 3 minutes to form uniform cement paste;
(3) weighing polymer fibers, adding the fibers into the cement slurry, stirring at a low speed for 2-3 minutes, and then stirring at a high speed for 1-2 minutes until the fibers are uniformly dispersed in the slurry;
(4) and pouring the stirred slurry into a mold for molding to obtain the high-toughness cement-based composite material product based on the construction waste micro powder.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114735958A (en) * | 2022-04-29 | 2022-07-12 | 浙江天造环保科技有限公司 | Preparation method of geopolymer |
| US11692082B2 (en) | 2021-02-02 | 2023-07-04 | EcoGensus LLC | Compositions containing solid waste material |
| US11964314B2 (en) | 2021-02-02 | 2024-04-23 | EcoGensus LLC | Powders comprising solid waste materials |
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| CN106673552A (en) * | 2016-12-23 | 2017-05-17 | 上海理工大学 | Ultrahigh-toughness cement-based composite material and preparation method thereof |
| CN107285714A (en) * | 2017-07-31 | 2017-10-24 | 北京中震建筑科学研究院有限公司 | A kind of high ductility vinal concrete and preparation method thereof |
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2019
- 2019-10-31 CN CN201911055492.3A patent/CN110818347A/en active Pending
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| EP1339650A2 (en) * | 2000-11-06 | 2003-09-03 | Institute of Paper Science and Technology | Fiber reinforced mineral-based materials and methods of making the same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11692082B2 (en) | 2021-02-02 | 2023-07-04 | EcoGensus LLC | Compositions containing solid waste material |
| US11964314B2 (en) | 2021-02-02 | 2024-04-23 | EcoGensus LLC | Powders comprising solid waste materials |
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Application publication date: 20200221 |