CN111377635B - Concrete modified recycled aggregate, modification method thereof and application thereof in cement-based permeable material - Google Patents
Concrete modified recycled aggregate, modification method thereof and application thereof in cement-based permeable material Download PDFInfo
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- CN111377635B CN111377635B CN201811651632.9A CN201811651632A CN111377635B CN 111377635 B CN111377635 B CN 111377635B CN 201811651632 A CN201811651632 A CN 201811651632A CN 111377635 B CN111377635 B CN 111377635B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/40—Porous or lightweight 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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a concrete modified recycled aggregate, a modification method thereof and application thereof in a cement-based permeable material. The concrete modified recycled aggregate is a solid-liquid mixture stored in a negative pressure state below 10 mbar; the solid-liquid mixture consists of single-grade recycled aggregate, recycled aggregate micro powder with the particle size of less than 80 mu m, an auxiliary agent and water; the concentration of the recycled aggregate micro powder in the aqueous solution is 5-20%; the auxiliary agent is any one of ammonium polyacrylate, sodium tripolyphosphate and sodium hexametaphosphate, and the concentration of the auxiliary agent is 0.01-0.1%. The concrete modified recycled aggregate is characterized in that the seed crystal is embedded in a porous structure on the surface of the recycled aggregate, the nucleation barrier of a hydration product between the recycled aggregate and the cement paste interface is reduced in an initial hydration stage, the rapid hydration of the interface area is promoted, the cohesiveness is improved, and the reduction of the performance of the cement-based water permeable material caused by the large amount of water absorption of the recycled aggregate in the subsequent hydration process is reduced.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a concrete modified recycled aggregate, a modification method thereof and application thereof in a cement-based permeable material.
Background
The resource recycling of the construction waste in China is still in an exploration stage at present, and the recycling rate of the construction waste is only 5%. The traditional construction waste treatment modes such as open-air stacking or landfill and the like not only aggravate dust emission and pollute the environment, but also occupy a large amount of land resources and influence the soil vegetation. Statistics shows that if the construction waste accounts for about 48.35% of the concrete waste by mass, the waste concrete is processed to prepare the recycled aggregate for the concrete, so that the harm of the waste construction waste can be solved, the current situation of the shortage of the sandstone aggregate in the concrete industry can be relieved, and the concrete is expected to become an important development direction in the future.
The cement-based permeable material comprises permeable concrete, permeable bricks and other products, is communicated with a porous structure, has the functions of filtering, purifying, storing and retaining rainwater, and is one of important components for the construction of sponge cities. The preparation of cement-based permeable materials by using recycled aggregates is also a hot point of research in recent years, however, the defects of high water demand, weak interface bonding, large drying shrinkage and the like of concrete prepared by using the recycled aggregates are caused by the existence of micro cracks on the surfaces of the recycled aggregates and adhesion of a large amount of hardened cement paste. The aggregates in the cement-based permeable material are only bonded by a thin layer of slurry, so the interface connection between the aggregates and the slurry is very important for the performance of the cement-based permeable material.
A great deal of research work has been carried out by numerous scholars and engineers: ZL 201610333509.7 discloses an ecological environment-friendly pervious concrete prepared from waste concrete, and the reactivity of recycled concrete aggregate, micro powder and granulated ferrochrome slag powder is improved by the combination of recycled aggregates with different particle sizes and a modifier. ZL201210261716.8 discloses a modified recycled aggregate and recycled aggregate high-performance concrete, wherein the recycled aggregate is soaked in nano-silica hydrocolloid with the concentration of 10-40 wt%, and the nano-silica can react with calcium hydroxide in the recycled aggregate to generate gel so as to improve the physical property and the mechanical property of the recycled aggregate.
However, the weak defect of the aggregate-slurry interface cannot be strengthened by simply improving the reaction degree of the cementing material in the recycled concrete by means of a modifier and the like; the recycled aggregate is crushed, screened and the like after being discarded, calcium hydroxide in slurry on the surface of the recycled aggregate can be completely reacted due to carbonization, and therefore, the method for reducing the surface porosity of the recycled aggregate by relying on a gel product generated by the reaction of nano-silica and calcium hydroxide is unreliable.
Disclosure of Invention
The invention provides a concrete modified recycled aggregate, a modification method thereof and application thereof in a cement-based permeable material.
The concrete modified recycled aggregate is a solid-liquid mixture stored in a negative pressure state below 10mbar, the solid-liquid mixture is prepared by immersing single-stage prepared recycled aggregate in a mixture of recycled aggregate micro powder with the particle size below 80 mu m, an auxiliary agent and water, and the concentration of the recycled aggregate micro powder in an aqueous solution is 5-20%; the auxiliary agent is one of ammonium polyacrylate, sodium tripolyphosphate and sodium hexametaphosphate, and the concentration of the auxiliary agent is 0.01-0.1%.
According to the invention, a recycled aggregate modification material is not required to be additionally used, and the seed crystal suspension with the super-early strength function is prepared by processing the micro-fine powder peeled off in the processes of crushing and screening the recycled aggregate, so that the hydration degree of slurry in the surface pores of the recycled aggregate can be rapidly improved in the very early stage of concrete hydration, the harm caused by high water absorption of the recycled aggregate is reduced, and the early mechanical property and long-term durability of the cement-based water permeable material are enhanced.
The method for modifying the recycled concrete aggregate comprises the following steps: the waste concrete is crushed and screened to prepare single-stage recycled aggregate and seed crystal suspension, and the modified recycled aggregate is obtained after the single-stage recycled aggregate and the seed crystal suspension are soaked in vacuum saturated seed crystal suspension and stored in a negative pressure state.
The method comprises the following specific steps:
(1) crushing and screening aggregate: the method comprises the steps of (1) adopting crushing and screening equipment to obtain single-stage recycled aggregate and fine powder with the particle size of less than 1mm from waste concrete after impurities are removed;
(2) grinding the fine powder to below 80 μm, adding water and adjuvant, ultrasonic dispersing to obtain 5-20% seed crystal suspension,
(3) and immersing the single-grade recycled aggregate in sufficient seed crystal suspension in a closed container, vacuumizing to below 10mbar, maintaining for 2 hours, taking out, and airing at room temperature until the aggregate is in a saturated surface dry state to obtain the modified recycled aggregate.
The modified recycled aggregate is applied as a cement-based permeable material.
The cement-based permeable material comprises the following components in percentage by weight: 300-450 parts of cement, 1300-1500 parts of single-stage recycled aggregate treated by the method, 80-120 parts of water and 6-10 parts of water reducing agent. The cement is Portland cement or ordinary Portland cement with the strength grade of 42.5 or 52.5, the single-stage prepared recycled aggregate is any one of the materials with the particle size of 2.4-4.75mm, 4.75-9.5mm or 9.5-13.2mm, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
The invention has the following beneficial effects:
the concrete recycled aggregate treated by the method can rapidly improve the hydration degree of slurry in the surface pores of the recycled aggregate in the very early stage of the hydration of the cement-based permeable material, reduce the harm caused by high water absorption of the recycled aggregate, and enhance the early mechanical property and long-term durability of the cement-based permeable material.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
In order to evaluate the improvement effect of the invention on the performance of the cement-based permeable material prepared from the concrete recycled aggregate, after 28d of curing is prepared, the compressive strength and the permeability coefficient of the test piece are respectively tested at 1d/7d/28 d. The specific operation is as follows:
preparation: the recycled aggregate and the cement are pre-stirred in a forced stirrer for 120s, and then water and a water reducing agent are sequentially added into the forced stirrer and stirred for 120 s.
Forming and maintaining: the compression strength and the water permeability coefficient of the test piece adopt 100 multiplied by 100mm3The concrete is molded by pressing by a press, the pressure is maintained for 5s at 10kN, the mold is removed after 1d of maintenance with the mold, and the test is carried out after standard maintenance to the specified age.
And (3) testing: the compressive strength of the test piece 28d is tested according to GB/T50081 Standard test method for mechanical Properties of ordinary concrete. And (3) the water permeability coefficient of the test piece is tested and calculated according to CJJ/T135 technical Specification for pervious concrete pavements.
Example 1
(1) The aggregate crushing and screening means that the waste concrete after impurity removal adopts crushing and screening equipment to obtain 9.5-13.2mm recycled aggregate and fine powder with the particle size of less than 1 mm; (2) taking the fine powder, further grinding and screening the fine powder to be below 80 mu m, adding water and an auxiliary agent, and preparing a seed crystal suspension with the concentration of 5% through ultrasonic dispersion, wherein the auxiliary agent is ammonium polyacrylate and the concentration of the auxiliary agent is 0.01%; (3) and immersing the single-graded recycled aggregate in a sufficient amount of seed crystal suspension in a closed container, vacuumizing to below 10mbar, maintaining for 2 hours, taking out, and airing at room temperature to a saturated surface dry state.
A high-performance treatment method for recycled concrete aggregate and application of the recycled concrete aggregate in a cement-based permeable material are disclosed, wherein the cement-based permeable material comprises the following components in percentage by weight: 300 parts of P & O42.5 cement, 1500 parts of 9.5-13.2mm recycled aggregate treated by the method, 80 parts of water and 6 parts of polycarboxylic acid high-performance water reducing agent.
Example 2
(1) The aggregate crushing and screening means that the waste concrete after impurity removal adopts crushing and screening equipment to obtain 4.75-9.5mm recycled aggregate and fine powder with the particle size of less than 1 mm; (2) taking the fine powder, further grinding and screening the fine powder to be below 80 mu m, adding water and an auxiliary agent, and preparing a seed crystal suspension with the concentration of 10% through ultrasonic dispersion, wherein the auxiliary agent is sodium tripolyphosphate and the concentration of the auxiliary agent is 0.05%; (3) and immersing the single-graded recycled aggregate in a sufficient amount of seed crystal suspension in a closed container, vacuumizing to below 10mbar, maintaining for 2 hours, taking out, and airing at room temperature to a saturated surface dry state.
A high-performance treatment method for recycled concrete aggregate and application of the recycled concrete aggregate in a cement-based permeable material are disclosed, wherein the cement-based permeable material comprises the following components in percentage by weight: 450 parts of P & II 42.5 cement, 1400 parts of 4.75-9.5mm recycled aggregate treated by the method, 120 parts of water and 10 parts of polycarboxylic acid high-performance water reducing agent.
Example 3
(1) The aggregate crushing and screening means that the waste concrete after impurity removal adopts crushing and screening equipment to obtain 2.4-4.75mm recycled aggregate and fine powder with the particle size of less than 1 mm; (2) taking the fine powder, further grinding and screening the fine powder to be below 80 mu m, adding water and an auxiliary agent, and preparing a seed crystal suspension with the concentration of 10% through ultrasonic dispersion, wherein the auxiliary agent is sodium hexametaphosphate and the concentration of the auxiliary agent is 0.1%; (3) and immersing the single-graded recycled aggregate in a sufficient amount of seed crystal suspension in a closed container, vacuumizing to below 10mbar, maintaining for 2 hours, taking out, and airing at room temperature to a saturated surface dry state.
A high-performance treatment method for recycled concrete aggregate and application of the recycled concrete aggregate in a cement-based permeable material are disclosed, wherein the cement-based permeable material comprises the following components in percentage by weight: 400 parts of P & II 52.5 cement, 1300 parts of 2.4-4.75mm recycled aggregate treated by the method, 100 parts of water and 8 parts of polycarboxylic acid high-performance water reducing agent.
Comparative example 1
The cement-based permeable material comprises the following components in percentage by weight: 300 parts of P & O42.5 cement, 1500 parts of 9.5-13.2mm recycled aggregate without surface treatment, 80 parts of water and 6 parts of polycarboxylic acid high-performance water reducing agent.
Comparative example 2
The cement-based permeable material comprises the following components in percentage by weight: 450 parts of P & II 42.5 cement, 1400 parts of recycled aggregate with the diameter of 4.75-9.5mm without surface treatment, 120 parts of water and 10 parts of polycarboxylic acid high-performance water reducing agent.
Comparative example 3
The cement-based permeable material comprises the following components in percentage by weight: 400 parts of P & II 52.5 cement, 1300 parts of 2.4-4.75mm recycled aggregate without surface treatment, 100 parts of water and 8 parts of polycarboxylic acid high-performance water reducing agent.
TABLE 1 Cement-based Water permeable Material Properties
| Performance index | Example 1 | Comparative example 1 | Example 2 | Comparative example 2 | Example 3 | Comparative example 3 |
| 1d compressive strengthdegree/MPa | 9.70 | 5.48 | 18.74 | 14.31 | 22.08 | 16.20 |
| 7d compressive strength/MPa | 13.19 | 8.72 | 21.45 | 17.88 | 27.02 | 25.34 |
| 28d compressive strength/MPa | 14.55 | 9.29 | 25.09 | 19.62 | 34.22 | 30.43 |
| Permeability coefficient/mm/s | 3.56 | 3.49 | 1.42 | 1.35 | 0.61 | 0.44 |
| 112d drying shrinkage/%) | 0.069 | 0.076 | 0.076 | 0.083 | 0.088 | 0.098 |
From the above results, it can be found that the comparative examples, which use the recycled aggregate of concrete without surface treatment, have significantly weaker compressive strengths of cement-based water permeable materials 1d, 7d and 28d and drying shrinkage of 112d than those of the cement-based water permeable materials prepared using the recycled aggregate of the same particle size after the surface treatment. Therefore, the surface treatment method plays a key role in improving the performance of the regenerated cement-based permeable material, and the inventor analyzes the main reason that:
the weak link of the concrete is at an aggregate-slurry interface, namely loose porous slurry and microcracks existing on the surface of the recycled aggregate, and the aggregate in the cement-based permeable material is bonded only through thin-layer slurry, so that the short slab effect of the weak interface is amplified. Therefore, the performance of the regenerated cement-based permeable material needs to be improved from the interface.
(1) The seed crystal suspension is sucked into pores and microcracks of slurry on the surface of the recycled aggregate through the pre-negative pressure of the seed crystal suspension, and the seed crystal participates in a cement hydration reaction at an aggregate-slurry interface in the concrete mixing process, so that the crystallization and precipitation potential energy of a cement hydration product is reduced, an interface area with a relatively compact microstructure can be generated at the very early stage of hydration, the performance difference between the interface and the slurry is reduced, and the early stage performance of the recycled cement-based permeable material is promoted to be greatly improved.
(2) In addition, with the increase of the compactness at the very early aggregate-slurry interface, the easy water absorption/water loss characteristic of the recycled aggregate in the concrete hydration process can be effectively inhibited, the drying shrinkage deformation of the recycled cement-based permeable material is reduced, and the long-term performance of the recycled cement-based permeable material is improved.
The upper and lower limit values of the raw materials and the interval values thereof can realize the invention, and the examples are not listed.
Claims (5)
1. The concrete modified recycled aggregate is characterized by being a solid-liquid mixture stored in a negative pressure state below 10 mbar; the solid-liquid mixture consists of single-grade recycled aggregate, recycled aggregate micro powder with the particle size of less than 80 mu m, an auxiliary agent and water; the concentration of the recycled aggregate micro powder in the aqueous solution is 5-20%; the auxiliary agent is any one of ammonium polyacrylate, sodium tripolyphosphate and sodium hexametaphosphate, and the concentration of the auxiliary agent is 0.01-0.1%.
2. The method for preparing the concrete modified recycled aggregate as claimed in claim 1, wherein the concrete modified recycled aggregate is obtained by crushing and screening the waste concrete to obtain a single-stage prepared recycled aggregate and a recycled aggregate micro powder suspension with the particle size of less than 80 μm, the recycled aggregate micro powder with the particle size of less than 80 μm is used as a seed crystal, the single-stage prepared recycled aggregate and an auxiliary agent are soaked in the suspension, and the concrete modified recycled aggregate is obtained after the suspension is stored in a negative pressure state.
3. The method according to claim 2, characterized by the following specific steps:
(1) crushing and screening aggregate: the method comprises the steps of (1) adopting crushing and screening equipment to obtain single-stage recycled aggregate and fine powder with the particle size of less than 1mm from waste concrete after impurities are removed;
(2) grinding the fine powder to below 80 μm, adding water and adjuvant, ultrasonic dispersing to obtain 5-20% seed crystal suspension,
(3) and immersing the single-graded recycled aggregate in sufficient crystal seed suspension in a closed container, vacuumizing to below 10mbar, maintaining for 2 hours, taking out, and airing at room temperature until the aggregate is in a saturated surface dry state to obtain the concrete modified recycled aggregate.
4. The use of the concrete modified recycled aggregate as claimed in claim 1, characterized in that it is used for making cement-based permeable materials.
5. The use according to claim 4, wherein the cement-based water permeable material consists of, in weight percent: 300-450 parts of cement, 1300 parts of concrete modified recycled aggregate, 1500 parts of water, 80-120 parts of water reducing agent and 6-10 parts of water reducing agent; the cement is Portland cement or ordinary Portland cement with the strength grade of 42.5 or 52.5, the particle size of the concrete modified recycled aggregate is any one of 2.4-4.75mm, 4.75-9.5mm or 9.5-13.2mm, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
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|---|---|---|---|---|
| CN102092993A (en) * | 2010-11-25 | 2011-06-15 | 浙江大学 | Nano reinforcing method for recycled aggregate concrete |
| CN103086663A (en) * | 2012-01-09 | 2013-05-08 | 深圳市华威环保建材有限公司 | Recycled aggregate structural concrete and manufacture method |
| CN103708792A (en) * | 2013-12-01 | 2014-04-09 | 内蒙古大学 | Preparation method for water permeable concrete |
| CN105130299A (en) * | 2015-08-20 | 2015-12-09 | 浙江工业大学 | In-situ reinforcement method of recycled aggregate |
| CN106116327A (en) * | 2016-06-20 | 2016-11-16 | 山东大元实业股份有限公司 | A kind of pervious concrete utilizing solid-state castoff to produce and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092993A (en) * | 2010-11-25 | 2011-06-15 | 浙江大学 | Nano reinforcing method for recycled aggregate concrete |
| CN103086663A (en) * | 2012-01-09 | 2013-05-08 | 深圳市华威环保建材有限公司 | Recycled aggregate structural concrete and manufacture method |
| CN103708792A (en) * | 2013-12-01 | 2014-04-09 | 内蒙古大学 | Preparation method for water permeable concrete |
| CN105130299A (en) * | 2015-08-20 | 2015-12-09 | 浙江工业大学 | In-situ reinforcement method of recycled aggregate |
| CN106116327A (en) * | 2016-06-20 | 2016-11-16 | 山东大元实业股份有限公司 | A kind of pervious concrete utilizing solid-state castoff to produce and preparation method thereof |
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