CN112592147A - Preparation and construction method of brick-concrete building waste residue regenerated road base inorganic mixture - Google Patents
Preparation and construction method of brick-concrete building waste residue regenerated road base inorganic mixture Download PDFInfo
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- CN112592147A CN112592147A CN202110092486.6A CN202110092486A CN112592147A CN 112592147 A CN112592147 A CN 112592147A CN 202110092486 A CN202110092486 A CN 202110092486A CN 112592147 A CN112592147 A CN 112592147A
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- brick
- building waste
- concrete building
- inorganic mixture
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A process for preparing the inorganic mixture used as the regenerated base layer of brick-concrete building dregs includes such steps as respectively grinding the regenerated sand powder of brick-concrete building dregs until its specific Boehringer surface area is greater than 400m2The solid phase of the inorganic mixture is prepared by uniformly mixing (by mass percentage) metakaolin/kg, calcium magnesium aluminosilicate and lime according to the mass percentage of 93-97: 0-1.0: 2.0-6.0: 0.5-1.5; laboratory experiments with inorganic binder stabilizing materials were conducted to determine the optimum water content with reference to the relevant test protocols. During construction, the raw material proportioning is determined according to the maximum dry density, and then the modulus is 1.0-2.0 and SiO2+Na2And (3) dissolving sodium silicate with the mass of 0.8-1.8% of the solid phase O in water with the optimal water content, cooling to obtain a liquid phase, uniformly mixing the liquid phase with the solid phase, and paving the road base layer according to the same construction method as the cement stabilizing material. The preparation and construction method of the inorganic mixture for the base layer of the regenerated road is simple and economic, the utilization rate of waste residues is high, the low carbon and environmental protection are realized, and the application prospect is wide.
Description
Technical Field
The invention belongs to the field of solid waste treatment and utilization and road building materials, and particularly relates to a preparation and construction method of a brick-concrete building waste residue regenerated road base inorganic mixture.
Background
The building waste residue refers to the general name of the waste soil, waste concrete, waste brick and stone and other wastes generated by people in the production activities of the building industries such as demolition, construction, decoration and repair and natural disasters such as flood and earthquake. The rapid development of city construction, the demolition of old buildings and the occurrence of natural disasters such as earthquake in China lead the output of building waste residues to increase day by day. According to statistics, the annual emission of the building waste residue in China is 30 hundred million tons, the regeneration utilization rate is less than 10 percent, most of the building waste residue is not treated, and the building waste residue is piled in the open, burned or simply buried, so that the ecology is destroyed, the land is occupied, and the environment is polluted.
Brick-concrete building waste residue (brick-mixed residue for short) is the building waste residue obtained by destroying buildings, which is mainly composed of inorganic nonmetallic substances such as waste bricks and tiles, building ash mortar, waste concrete, a small amount of glass and ceramics and the like, besides organic impurities such as reinforcing steel bars, wood, plastics and the like are removed, wherein usually, the waste clay (red) bricks and the waste concrete occupy the absolute main components. In recent years, excessive mining of mines not only damages the ecological environment, but also causes the shortage of available mineral resources in many cities, and the mine positions are more and more far away from the cities, so that the transportation cost is increased day by day. The brick-concrete slag is reasonably used in road engineering construction to relieve the tension of mineral resources, and the reprocessing treatment of the brick-concrete slag to replace sandstone resources for road construction increasingly becomes one of the main ways of treating and utilizing brick-concrete building waste slag.
The brick-mixed slag contains a plurality of waste clay bricks with poor strength and high water absorption, and the crushing value of the coarse aggregate obtained by crushing the brick-mixed slag is generally higher than the upper limit requirement of a pavement base material on the crushing value of the coarse aggregate, so that the recycled water-stable material mainly replaces a part of natural aggregate when used for a high-grade road base layer, and the aggregate is completely brick-mixed slag generally only meets the requirements of second-grade and lower-grade roads. Moreover, a large amount of sand powder generated when the brick-concrete slag is crushed cannot be utilized in the road base material. In a word, the utilization rate of the brick mixed slag is low when the brick mixed slag is used for road base materials, the processing technology is complex, and the waste utilization rate, the economy and the environmental protection of the regenerated base materials are influenced.
It is generally accepted that the activity of the brick slag is very low and that its fine powder is not suitable for direct use as a cementitious material. But the waste clay brick powder and the waste concrete powder have certain potential gelatinization, the potential gelatinization of the brick-concrete slag fine powder is fully utilized and excited, the brick-concrete slag fine powder can be converted into a cementing material through cold excitation by adding a small amount of auxiliary agent, and the cementing material can be used for cementing recycled aggregate to prepare a road base material. Because the fine powder on the surface of the recycled aggregate has the gelling property under the action of the exciting agent, the process of washing and removing dust can be eliminated when the recycled aggregate prepared by crushing the waste residues is used for a road base, the processing method is simplified, and the processing cost is reduced. The interface combination mode of the brick-concrete building waste residue regenerated cementing material and the regenerated aggregate is mainly firm chemical combination, and the combination mode of the portland cement and the aggregate is mainly relatively weak physical combination, so that the design specification limit of a water-stable material can be broken through the grain size distribution design of the regenerated mixture, and the aggregate is prevented from being cracked due to stress concentration when the load is carried by reducing the grain size, so that the economy of the regenerated base material and the doping amount of the brick-concrete waste residue are improved, and the high doping amount full utilization of the brick-concrete residue in the application of the road base material is realized.
Disclosure of Invention
The invention aims to regenerate the road base layer by using the brick-concrete building waste residue with zero emission and high doping amount by a simple and economic method.
In order to achieve the purpose, the invention adopts the technical scheme that: the brick-concrete building waste residue regenerated road base inorganic mixture is prepared by grinding brick-concrete building waste residue regenerated sand powder to Boehringer specific surface area greater than 400m2The method comprises the following steps of uniformly mixing (by mass percentage) metakaolin, calcium magnesium aluminosilicate and lime of every kg in sequence according to the mass percentage of 93-97: 0-1.0: 2.0-6.0: 0.5-1.5 to obtain a solid phase, wherein the lime comprises a main phase component of Ca (OH)2And reacting with water to form Ca (OH)2The lime is added in an amount of Ca (OH) contained therein and formed by reaction with water2Calculating the mass of (2); a modulus of 1.0 to 2.0 and SiO2+Na2And dissolving sodium water glass with the mass of 0.8-1.8% of that of the solid phase in water with the optimal water content, cooling to room temperature to obtain a liquid phase, and uniformly mixing the solid phase and the liquid phase to obtain the road base inorganic mixture, wherein the optimal water content is determined according to an inorganic binder stable material compaction test method.
The construction method for regenerating the road base inorganic mixture by using the brick-concrete building waste residues comprises the following steps: and (3) measuring the maximum dry density according to an inorganic binder stable material compaction test method, determining the inorganic mixture sample proportioning according to the maximum dry density, and paving and curing the prepared inorganic mixture according to the same construction method as the cement stable material to obtain the road base.
The brick-concrete building waste residue regenerated sand powder is prepared by sorting and pretreating building waste residues, removing organic matters and metals such as wood, rubber, plastics, asphalt, cloth fibers, household garbage, reinforcing steel bars and the like, drying the obtained brick-concrete building waste residues mainly comprising waste sintered clay bricks, waste concrete and cement mortar, and crushing the dried brick-concrete building waste residues by any method to obtain a mixture of unscreened fine sand and fine powder with the particle size of not more than 4.75 mm.
The metakaolin is prepared by fully calcining kaolin externally doped with 1-2% of NaOH at 600-750 ℃ and then cooling.
The calcium magnesium aluminosilicate is obtained by fully calcining a raw material mainly containing oxides of silicon, aluminum, calcium and magnesium at 1300-1550 ℃ and then cooling the calcined raw material with water, and the chemical composition of the calcium magnesium aluminosilicate meets the following requirements in mass: K2O +0.658Na2O = 0.2-5.8%, (CaO + MgO)/(SiO2+ Al2O3) = 0.70-1.30.
In order to change the workability, the economical efficiency and the service performance of the inorganic mixture of the regenerated road base layer, one or more chemical additives, mineral mixed materials and aggregates can be added during the mixing of the raw materials.
The preparation and construction method of the brick-concrete building waste residue regenerated road base inorganic mixture has the advantages of simple technical process, convenient construction, high waste residue utilization rate, realization of zero emission production of the mixture, great substitution and saving of cement and gravel, cost reduction, ecological environment protection, energy conservation and emission reduction, and accordance with the sustainable green development requirement of traffic and urban construction in China.
Detailed Description
The invention is further described with reference to specific examples, but the scope of the invention is not limited thereto.
Firstly, the building waste residue is sorted and pretreated, organic matters such as wood, rubber, plastics, asphalt, cloth fiber and domestic garbage and metal materials such as reinforcing steel bars are removed, the remaining waste residue mainly comprises waste clay bricks, waste concrete, crushed mortar pieces, a small amount of glass ceramics and the like,belongs to brick-concrete building waste residue, and the latter is crushed in multiple stages to obtain regenerated sand powder with the particle size not greater than 4.75 mm. Mixing kaolin with 1.5% of caustic soda, grinding, calcining at 750 deg.C for 3 hr, naturally cooling to obtain metakaolin, grinding, and measuring its Bosch's specific surface area as 455m2Per kg; the method comprises the following steps of preserving heat of 4 raw materials mainly containing oxides of silicon, aluminum, calcium and magnesium at the highest calcination temperature of 1300-1550 ℃ for 3 hours, and then cooling with water to obtain calcium magnesium aluminosilicate, wherein the chemical composition of the calcium magnesium aluminosilicate expressed by mass satisfies the following requirements: (CaO + MgO)/(SiO2+ Al2O3) = 0.70-1.30, K2O +0.658Na2O = 0.2-5.8%, and the relevant indexes are shown in Table 1. Respectively grinding four calcium magnesium aluminosilicate powders, and measuring that the specific surface areas are approximately the same and are all 400-500 m2Between/kg. Lime separation analysis pure Ca (OH)2Powder with a specific surface of more than 400m2/kg。
TABLE 1 calcination temperature and chemical composition characteristics of calcium magnesium aluminosilicate
The method for manufacturing the regenerated base material cylindrical test piece and the curing are carried out according to the manufacturing method of the T0843-2009 inorganic binder stable material test piece, and the differences and the needs are particularly embodied in that: (1) mixing brick and concrete reclaimed sand powder, metakaolin, calcium magnesium aluminosilicate and Ca (OH)2Uniformly mixing 93-97: 0-1.0: 2.0-6.0: 0.5-1.5 mass percent of sodium silicate as a solid phase, and preparing sodium silicate with the modulus of 1.0-2.0 according to the SiO2+Na2The mass of O is 0.8-1.8% of the solid phase, sodium water glass is completely dissolved by using water as little as possible to prepare a saturated solution, and the saturated solution is cooled to room temperature for later use. (2) The optimum water content and the maximum dry density are determined by referring to a T0804-1994 inorganic binder stable material compaction test method, which is different from a standard test method in that: 1) the sample for infiltration is the solid phase in the step (1), and the infiltration water is water obtained by subtracting the water for dissolving the sodium silicate from the preset water content; 2) the stabilizer cement added before compaction was replaced with a saturated solution of water glass. (3) A test mould for preparing a base material test piece is a cylindrical steel mould with the diameter of 50 and the height of 50. Mass obtained by multiplying the maximum dry density by the volume of the test cylinderThe sum of the dry solid phase of the test piece and the solid phase dosage of the water glass, wherein the solid phase of the water glass is regarded as SiO in the test piece2+Na2And O, calculating the required sample dosage for each test piece according to the above calculation. (4) The water consumption for infiltration when preparing the base material test block is determined by subtracting the water content of the dissolved water glass from the optimal water content, and the predetermined amount of cement added before the test block is formed is replaced by the predetermined amount of water glass saturated solution.
And testing the untested compressive strength of the test piece which is cured for 6 days by moisturizing and is cured for 1 day by soaking in water at 20 ℃. The formulation parameters and compressive strength values of the relevant test pieces of each example are detailed in table 2. As can be seen from Table 2, the mixing amount of the gelatinizing agent in the brick-concrete waste residue regenerated road base inorganic mixture is only 3.0-7.0%, the rest is all regenerated sand powder, the 7-day compressive strength of the base material test piece is 3.1-8.4 MPa, and the highest compressive strength of the base material test piece exceeds the strength requirement of the highway road base, so that the regenerated inorganic mixture can be simply, economically and fully utilized in a large proportion, and a large amount of building waste residues are consumed to pave road bases of various grades, and the economic and environmental significance is achieved.
TABLE 2 formulation parameters and compressive strength of test pieces of regenerated road base material
Claims (6)
1. The preparation method of the brick-concrete building waste residue regenerated road base inorganic mixture is characterized by comprising the following steps of: respectively grinding the brick-concrete building waste residue regenerated sand powder until the specific Bosch surface area is more than 400m2The method comprises the following steps of uniformly mixing (by mass percentage) metakaolin, calcium magnesium aluminosilicate and lime of every kg in sequence according to the mass percentage of 93-97: 0-1.0: 2.0-6.0: 0.5-1.5 to obtain a solid phase, wherein the lime comprises a main phase component of Ca (OH)2And reacting with water to form Ca (OH)2The lime is added in an amount of Ca (OH) contained therein and formed by reaction with water2Calculating the mass of (2); a modulus of 1.0 to 2.0 and SiO2+Na2Dissolving sodium water glass with the mass of 0.8-1.8% of O in solid phase with water with optimal water content, and cooling to room temperature to obtain liquid phase and solid phaseAnd mixing the inorganic mixture with the liquid phase uniformly to obtain the road base inorganic mixture, wherein the optimal water content is determined according to an inorganic binder stable material compaction test method.
2. The construction method of the brick-concrete building waste residue recycled road base inorganic mixture as claimed in claim 1, characterized in that: and (3) measuring the maximum dry density according to an inorganic binder stable material compaction test method, determining the sample proportioning according to the maximum dry density, and paving and maintaining the prepared inorganic mixture according to the same construction method as the cement stable material to obtain the road base layer.
3. The preparation method of the inorganic mixture for regenerating the road base layer by the brick-concrete building waste residue as claimed in claim 1 or 2, which is characterized in that: the brick-concrete building waste residue regenerated sand powder is prepared by sorting and pretreating building waste residues, removing organic matters and metals such as wood, rubber, plastics, asphalt, cloth fibers, household garbage, reinforcing steel bars and the like, drying the obtained brick-concrete building waste residues mainly comprising waste sintered clay bricks, waste concrete and cement mortar, and crushing the dried brick-concrete building waste residues by any method to obtain a mixture of unscreened fine sand and fine powder with the particle size of not more than 4.75 mm.
4. The preparation method of the inorganic mixture for regenerating the road base layer by the brick-concrete building waste residue as claimed in claim 1 or 2, which is characterized in that: the metakaolin is prepared by fully calcining kaolin externally doped with 1-2% of NaOH at 600-750 ℃ and then cooling.
5. The preparation method of the inorganic mixture for regenerating the road base layer by the brick-concrete building waste residue as claimed in claim 1 or 2, which is characterized in that: the calcium magnesium aluminosilicate is obtained by fully calcining a raw material mainly containing oxides of silicon, aluminum, calcium and magnesium at 1300-1550 ℃ and then cooling the calcined raw material with water, wherein the chemical composition of the calcium magnesium aluminosilicate meets the following requirements in mass percent: K2O +0.658Na2O = 0.2-5.8%, (CaO + MgO)/(SiO2+ Al2O3) = 0.70-1.30.
6. The method for preparing the inorganic mixture for regenerating the road base layer by the brick-concrete building waste residue as claimed in any one of claims 1 to 5, which is characterized in that: in order to change the workability, the economical efficiency and the service performance of the inorganic mixture of the regenerated road base layer, one or more chemical additives, mineral mixed materials and aggregate are added during the mixing of the raw materials.
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Cited By (2)
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| CN116514425A (en) * | 2023-05-05 | 2023-08-01 | 长沙理工大学 | Preparation method of composite alkali-activated building solid waste base cementing material and building solid waste semi-rigid base layer |
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