CN115557716A - Full-solid waste pavement base cementing material and preparation method thereof - Google Patents
Full-solid waste pavement base cementing material and preparation method thereof Download PDFInfo
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- CN115557716A CN115557716A CN202211348677.5A CN202211348677A CN115557716A CN 115557716 A CN115557716 A CN 115557716A CN 202211348677 A CN202211348677 A CN 202211348677A CN 115557716 A CN115557716 A CN 115557716A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a full-solid waste pavement base cementing material and a preparation method thereof, belonging to the technical field of building materials and comprising the following raw materials in parts by weight: 30-40 parts of sintered flue gas desulfurization ash, 50-70 parts of blast furnace slag, 3-10 parts of tailings, 5-8 parts of building solid waste, 2-8 parts of biochar, 6-10 parts of modified rubber powder and 30-50 parts of carbide slag. The preparation method comprises the following steps: 1) Respectively grinding the raw materials to specific surface area of 200-400m 2 Per kg; 2) To the building to fixAdding biochar and modified rubber into the waste, uniformly mixing, adding the rest raw materials, continuously stirring and heating for 2-4h, and then cooling and grinding to obtain the full-solid waste pavement base cementing material. The raw materials in the invention are prepared from industrial waste or agricultural and forestry waste, can replace cement to be used for preparing the pavement base, realizes the full recycling of solid waste, reduces the discharge of waste and protects the natural environment.
Description
Technical Field
The invention relates to the field of building materials, in particular to a full-solid waste pavement base cementing material and a preparation method thereof.
Background
Cementitious materials, also known as cements. Under the physical and chemical action, it can be changed into firm stone-like body from slurry, and can be used for cementing other materials, so that it can be made into the composite solid matter with a certain mechanical strength. The gelled material is widely applied to the fields of construction, traffic, water conservancy and the like. In the prior art, a pavement base is mostly prepared by using cement concrete, the cement concrete is a cementing material consisting of cement and admixture, gravels form coarse and fine aggregate, and functional auxiliaries such as a water reducing agent and an expanding agent, the cement concrete is used as a main strength source of a pavement structure and comes from hydration of the cement, main active mineral components of the cement are tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite, the active components and water are subjected to hydration reaction to generate a cement stone gel with certain gel strength, and the gravels and the aggregates are bonded to form the pavement structure.
However, the traditional cement concrete pavement is not wear-resistant, has small deformation performance, is easy to cause cracks, and is extremely easy to damage or even break the slab after being subjected to multiple freeze-thaw cycles in northern areas. And the cost and the selling price of the common portland cement are high, and the carbon emission is also high.
Therefore, how to provide a cementing material capable of replacing ordinary portland cement is a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a full-solid waste pavement base cementing material and a preparation method thereof, which are used for solving the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
a full-solid waste pavement base cementing material comprises the following raw materials in parts by weight:
30-40 parts of sintered flue gas desulfurization ash, 50-70 parts of blast furnace slag, 3-10 parts of tailings, 5-8 parts of building solid waste, 2-8 parts of biochar, 6-10 parts of modified rubber powder and 30-50 parts of carbide slag.
Preferably, the tailings are iron tailings.
Preferably, the preparation method of the biochar is as follows:
crushing the agricultural and forestry waste into particles with the particle size of 1-10mm, heating to 200-250 ℃ from normal temperature under the condition of oxygen isolation, preserving heat for 20-45min, heating to 450-620 ℃ again, preserving heat for 2-4h, and then cooling, grinding and sieving, activating by an activating agent, washing and drying to obtain the solid biochar.
Preferably, the agricultural and forestry waste comprises one or more of crop straws, sawdust, bamboo dust and traditional Chinese medicine residues which are mixed in any proportion.
Preferably, the activator is activated to: and soaking for 2-4 hours by using an acid solution or an alkali solution with the mass concentration of 7-8% as an activating agent.
Wherein the acid solution is hydrochloric acid or sulfuric acid solution;
the alkali solution is sodium hydroxide or potassium hydroxide solution.
Has the advantages that: the biochar in the invention has high specific surface area and is used for CO 2 Has adsorption and desorption effects. The accumulation in the aggregate is changed, and CO can be introduced 2 Reach the inside of the aggregate through the pores in the biochar particles to promote CO 2 And the carbon is transmitted in the aggregate, so that the carbonization efficiency is improved, and the strength of the aggregate is improved. In addition, the biochar has lower density per se, and can reduce the bulk density of the aggregate. In addition, in the invention, the biochar, the rubber particles and the waste glass are added together, so that the reaction of the waste glass and metal oxides in industrial waste is promoted, and meanwhile, the biochar can further act with the modified rubber powder under the high-temperature condition, so that the hydrophilic property of the modified rubber powder is improved, and the layering and floating of the rubber powder are avoided.
Preferably, the preparation method of the modified rubber powder comprises the following steps:
(1) Grinding the waste tires to 30-50 meshes, adding the ground waste tires into an alkaline solution for soaking, and then cleaning the waste tires to be neutral to obtain rubber powder subjected to alkaline treatment;
(2) And mixing the rubber powder subjected to alkali treatment with poly dimethyl diallyl ammonium chloride, heating in a water bath, and drying after the reaction is finished to obtain modified rubber powder.
Preferably, the alkali solution has a mass concentration of 7-8%, and the alkali includes NaOH, KOH and Ca (OH) 2 One or more of the above;
the soaking time is 50-70min;
the addition ratio of the waste tire to the poly dimethyl diallyl ammonium chloride is 1 (0.9-1.7).
Has the beneficial effects that: in the prior art, the phenomenon of floating of rubber particles frequently occurs when the waste rubber is used for preparing concrete, the invention firstly carries out alkali treatment on the rubber particles, removes the hydrophobic surface of the rubber, increases the specific surface area, and then carries out surface modification on the rubber powder after the alkali treatment by utilizing the poly dimethyl diallyl ammonium chloride, thereby improving the hydrophilicity of the rubber, enabling the rubber powder to be uniformly mixed with mortar, and inhibiting the floating and layering of the rubber particles. Meanwhile, the mechanical property and durability of the all-solid-waste pavement base layer cementing material are enhanced by the modified rubber powder, the waste tires often comprise certain graphene components, and after the graphene components are mixed with the waste glass, the reaction of components such as silicon dioxide in the waste glass and metal oxides in industrial waste can be promoted, and the production efficiency is improved. Meanwhile, the modified rubber powder has certain toughness, and the breaking strength of the product can be greatly improved. Moreover, the high polymer material component in the modified rubber powder can prevent water accumulated on the road surface from permeating into the gelled material, so that the gelled material is prevented from being damaged by icing of water in the gelled material under the condition that the temperature is lower than 0 ℃ in winter in the north.
Preferably, the building solid waste comprises waste concrete and/or waste glass.
Has the advantages that: in the building solid waste added in the invention, the main component of the waste glass is silicon dioxide, and the silicon dioxide can react with metal oxide in steel slag to generate silicate under the high-temperature condition, so that the hydration effect of the cementing material can be improved, and the silicate cement in the prior art can be replaced.
In addition, the waste concrete used in the invention improves the effective utilization level of the building solid waste, and further reduces the production cost.
Preferably, the specific surface area of the all-solid waste pavement base layer cementing material is 310-380m 2 /kg。
A preparation method of a full-solid waste pavement base cementing material comprises the following steps:
1) Respectively grinding the raw materials to a specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 530-600 ℃, adding the biochar and the modified rubber, uniformly mixing, cooling to 410-450 ℃, adding the sintered flue gas desulfurization ash, blast furnace slag, tailings and carbide slag, uniformly mixing, continuously stirring and heating for 2-4h, cooling and grinding to obtain the all-solid-waste pavement base cementing material.
Preferably, the grinding in the step 2) is grinding until the specific surface area is 310-380m 2 /kg。
Has the advantages that: in the invention, firstly, the waste glass in the building solid waste is melted, and after the biochar and the modified rubber powder are mixed, the waste glass can be kept in a melting state at 410-450 ℃, and if the temperature is raised, the energy waste is caused. Further, the invention mixes the sintering flue gas desulfurization ash, blast furnace slag, tailings and carbide slag with the construction solid waste, the biochar and the modified rubber powder, so that the silicon dioxide in the glass reacts with the metal oxide in the industrial waste to generate silicate at high temperature, and the generation of the silicate can promote the hydration of the cementing material.
The invention discloses a full-solid waste pavement base cementing material and a preparation method thereof.
Secondly, the raw materials in the invention can generate synergistic action, and the reaction product of the building solid waste and the industrial waste can improve the hydration action of the cementing material, thereby shortening the initial setting time of the cementing material and improving the product strength.
Furthermore, the biochar and the modified rubber powder can improve the strength of the cementing material, and simultaneously can reduce the softening temperature of the building solid waste, thereby saving the energy in the preparation process and reducing the production cost.
In addition, the cementing material of the invention can be used as a substitute material of cement, can be used as a cementing material of a pavement base, can also be used as a cementing material of a pavement, and has wide application range.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
The blast furnace slag used in the invention is slag micro powder of Anemata excelsa resource, public technology and technology limited company; the sintering flue gas desulfurization ash is desulfurization ash of a Dalonshan pelletizing plant;
the chemical compositions of other raw materials are shown in the following table 1:
table 1:
| CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | MgO | others | |
| Tailing (%) | 5.1-6.1 | 57-61 | 10-12 | 10-11.5 | 6.0-6.4 | R 2 O3.5-4.0 |
| Carbide slag (%) | 62-67 | 2.0-8.0 | 0.1-0.7 | 0.2-1.2 | 0.3-1.5 | P 2 O 5 0.3-1.0 |
Note: the percentages of the chemical compositions are mass percentage
Example 1
A full-solid waste pavement base cementing material comprises the following raw materials in parts by weight:
30 parts of sintering flue gas desulfurization ash, 70 parts of blast furnace slag, 10 parts of tailings, 5 parts of building solid waste, 8 parts of biochar, 8 parts of modified rubber powder and 30 parts of carbide slag.
Wherein the building solid waste is waste glass.
A preparation method of a full-solid waste pavement base cementing material comprises the following steps:
1. preparing the biochar:
mixing corn straws, wheat straws and rice straws in equal proportion by mass, crushing the mixture to a particle size of 1-10mm, heating the mixture from the normal temperature to 210 ℃ under an oxygen-isolated condition, preserving heat for 20min, heating the mixture to 620 ℃, preserving heat for 2h, cooling the mixture to the room temperature, grinding the mixture, sieving the mixture by a 50-mesh sieve, soaking the mixture by using a sulfuric acid solution with the mass concentration of 7% as an activating agent for 4h for activation, washing the mixture by water to be neutral, and drying the mixture at the temperature of 60-80 ℃ to obtain the solid biochar.
2. Preparing modified rubber powder:
(1) Grinding waste tires to 30-50 meshes, adding the ground waste tires into 8% potassium hydroxide solution, soaking for 50min, and then cleaning to be neutral to obtain rubber powder subjected to alkali treatment;
(2) And (2) mixing the rubber powder subjected to alkali treatment with poly dimethyl diallyl ammonium chloride according to the mass ratio of 1.1, heating in a water bath at 455 ℃ for 6.5h, and drying after the reaction is finished to obtain the modified rubber powder.
3. Preparing a full-solid waste pavement base cementing material:
1) Respectively grinding the raw materials to a specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 600 ℃, continuously heating until the waste glass is melted, then adding the biochar and the modified rubber for uniform mixing, then cooling to 410 ℃, adding the sintered flue gas desulfurization ash, blast furnace slag, tailings and carbide slag for uniform mixing, continuously stirring and heating for 4 hours, then cooling, and grinding until the specific surface area is 370m 2 And/kg, obtaining the all-solid waste pavement base cementing material.
Example 2
A full-solid waste pavement base cementing material comprises the following raw materials in parts by weight:
40 parts of sintering flue gas desulfurization ash, 50 parts of blast furnace slag, 3 parts of tailings, 7 parts of building solid waste, 5 parts of biochar, 6 parts of modified rubber powder and 35 parts of carbide slag.
Wherein the solid wastes of the building are waste concrete and waste glass.
A preparation method of a full-solid waste pavement base cementing material comprises the following steps:
1. preparing biochar:
mixing corn straws, wheat straws and wood chips in a mass ratio, crushing the mixture to a particle size of 1-10mm, heating the mixture from the normal temperature to 230 ℃ under an oxygen-isolated condition, preserving heat for 30min, heating the mixture to 450 ℃, preserving heat for 4h, cooling the mixture to the room temperature, grinding the mixture, sieving the mixture by a 50-mesh sieve, soaking the mixture by using a potassium hydroxide solution with the mass concentration of 7% as an activating agent for 3h for activation, washing the mixture by water to be neutral, and drying the mixture at the temperature of 60-80 ℃ to obtain the solid biochar.
2. Preparing modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the ground waste tires into an alkali sodium hydroxide solution with the mass concentration of 8%, soaking for 60min, and then cleaning to be neutral to obtain rubber powder subjected to alkali treatment;
(2) And (2) mixing the rubber powder treated by the rubber powder and poly dimethyl diallyl ammonium chloride according to the mass ratio of 1.5, heating in a water bath at 45 ℃ for 7.5h, and drying after the reaction is finished to obtain the modified rubber powder.
3. Preparing a full-solid waste pavement base cementing material:
1) Respectively grinding the raw materials to a specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 530 ℃, continuously heating until the waste glass is melted, then adding the biochar and the modified rubber for uniform mixing, then cooling to 450 ℃, adding the sintered flue gas desulfurization ash, blast furnace slag, tailings and carbide slag for uniform mixing, continuously stirring and heating for 2 hours, then cooling, and grinding until the specific surface area is 320m 2 And/kg, obtaining the all-solid waste pavement base layer cementing material.
Example 3
A full-solid waste pavement base cementing material comprises the following raw materials in parts by weight:
35 parts of sintering flue gas desulfurization ash, 55 parts of blast furnace slag, 8 parts of tailings, 6 parts of building solid waste, 2 parts of biochar, 10 parts of modified rubber powder and 40 parts of carbide slag.
Wherein the building solid waste is waste glass.
A preparation method of a full-solid waste pavement base cementing material comprises the following steps:
1. preparing biochar:
mixing corn straws, bamboo chips and wood chips in a mass ratio, crushing the mixture to a particle size of 1-10mm, heating the mixture from the normal temperature to 220 ℃ under an oxygen-isolated condition, preserving heat for 30min, heating the mixture to 590 ℃, preserving heat for 2.5h, cooling the mixture to the room temperature, grinding the mixture, sieving the mixture with a 40-mesh sieve, soaking the mixture for 2h for activation by using a hydrochloric acid solution with the mass concentration of 8% as an activating agent, washing the mixture with water to be neutral, and drying the mixture at the temperature of 60-80 ℃ to obtain the solid biochar.
2. Preparing modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the ground waste tires into a sodium hydroxide solution with the mass concentration of 7%, soaking for 70min, and then cleaning to be neutral to obtain rubber powder after alkali treatment;
(2) And mixing the treated rubber powder with poly dimethyl diallyl ammonium chloride according to the mass ratio of 1.3, heating the mixture in a water bath at 50 ℃ for 7 hours, and drying the mixture after the reaction is finished to obtain the modified rubber powder.
3. Preparing a full-solid waste pavement base cementing material:
1) Respectively grinding the raw materials to a specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 570 ℃, continuously heating until waste glass is melted, then adding the biochar and the modified rubber to be uniformly mixed, cooling to 430 ℃, adding sintered flue gas desulfurization ash, blast furnace slag, tailings and carbide slag to be uniformly mixed, continuously stirring and heating for 3 hours, cooling, and grinding until the specific surface area is 350m 2 And/kg, obtaining the all-solid waste pavement base layer cementing material.
Example 4
A full-solid waste pavement base cementing material comprises the following raw materials in parts by weight:
38 parts of sintering flue gas desulfurization ash, 65 parts of blast furnace slag, 5 parts of tailings, 8 parts of building solid waste, 7 parts of biochar, 7 parts of modified rubber powder and 45 parts of carbide slag.
Wherein the building solid waste is waste glass.
A preparation method of a full-solid waste pavement base cementing material comprises the following steps:
1. preparing biochar:
mixing sawdust, bamboo sawdust, chinese medicine residue and rice straw in equal mass proportion, crushing to particle size of 1-10mm, heating from normal temperature to 250 ℃ under oxygen-isolated condition, keeping the temperature for 20min, heating to 550 ℃, keeping the temperature for 3h, cooling to room temperature, grinding, sieving with a 40-mesh sieve, soaking for 3h with 7.5% sodium hydroxide solution as an activating agent for activation, washing with water to neutrality, and drying at 60-80 ℃ to obtain the solid biochar.
2. Preparing modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the ground waste tires into a calcium hydroxide solution with the mass concentration of 7.5%, soaking for 60min, and then cleaning to be neutral to obtain rubber powder after alkali treatment;
(2) And mixing the treated rubber powder with poly dimethyl diallyl ammonium chloride according to the mass ratio of 1.9, heating the mixture in a water bath at 60 ℃ for 6 hours, and drying the mixture after the reaction is finished to obtain the modified rubber powder.
3. Preparing a full-solid waste pavement base cementing material:
1) Respectively grinding the raw materials to a specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 590 ℃, continuously heating until the waste glass is melted, then adding the biochar and the modified rubber for uniform mixing, then cooling to 440 ℃, adding the sintered flue gas desulfurization ash, blast furnace slag, tailings and carbide slag for uniform mixing, continuously stirring and heating for 3.5h, then cooling, and pulverizing until the specific surface area is 310m 2 And grinding per kg to obtain the all-solid-waste pavement base cementing material.
Example 5
A full-solid waste pavement base cementing material comprises the following raw materials in parts by weight:
32 parts of sintering flue gas desulfurization ash, 60 parts of blast furnace slag, 7 parts of tailings, 6 parts of building solid waste, 4 parts of biochar, 9 parts of modified rubber powder and 40 parts of carbide slag.
Wherein the solid wastes of the building are waste concrete and waste glass.
A preparation method of a full-solid waste pavement base cementing material comprises the following steps:
1. preparing the biochar:
mixing the traditional Chinese medicine residues, bamboo sawdust, wheat straw and rice straw in a mass ratio, crushing the mixture to a particle size of 1-10mm, heating the mixture from the normal temperature to 200 ℃ under an oxygen-isolated condition, preserving heat for 45min, heating the mixture to 500 ℃, preserving heat for 3.5h, cooling the mixture to the room temperature, grinding the mixture to pass through a 50-mesh sieve, soaking the mixture for 2 hours for activation by using a hydrochloric acid solution with the mass concentration of 8% as an activating agent, washing the mixture to be neutral by using water, and drying the mixture at the temperature of 60-80 ℃ to obtain the solid biochar.
2. Preparing modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the ground waste tires into a sodium hydroxide solution with the mass concentration of 7%, soaking for 50min, and then cleaning to be neutral to obtain rubber powder after alkali treatment;
(2) And (2) mixing the rubber powder treated by the rubber powder and poly dimethyl diallyl ammonium chloride according to the mass ratio of 1.7, heating in a water bath at 40 ℃ for 8 hours, and drying after the reaction is finished to obtain the modified rubber powder.
3. Preparing a full-solid waste pavement base cementing material:
1) Respectively grinding the raw materials to a specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 540 ℃, continuously heating until the waste glass is melted, then adding the biochar and the modified rubber to be uniformly mixed, cooling to 420 ℃, adding the sintered flue gas desulfurization ash, blast furnace slag, tailings and carbide slag to be uniformly mixed, continuously stirring and heating for 4 hours, cooling, and grinding until the specific surface area is 380m 2 And/kg, obtaining the all-solid waste pavement base cementing material.
To investigate the effect of the components on the cement, the invention was verified by setting up a comparative example.
Comparative example 1
A cementitious material, differing from example 1 only in that:
the same procedure and parameters as in example 1 were followed except that the biochar was not included.
Comparative example 2
A cementitious material, differing from example 1 only in that:
the rest of the steps and parameters were the same as in example 1, except that waste glass was not included.
Comparative example 3
A cementitious material, differing from example 1 only in that:
the modified rubber powder was not included, and the remaining steps and parameters were the same as in example 1.
Comparative example 4
A cementitious material, differing from example 1 only in that:
the modified rubber powder was replaced with an unmodified rubber powder, and the remaining steps and parameters were the same as in example 1.
A method of preparing a cementitious material, which differs from example 1 only in that:
the step 2 is: the preparation method of the rubber particles comprises the following steps: grinding the waste tires to 30-50 meshes to obtain unmodified rubber powder.
Comparative example 5
One cementitious material is the commercial P0425 cement.
The technical effects are as follows:
concrete test pieces were prepared from the cement materials of examples 1 to 5 and comparative examples 1 to 4. Wherein the water-gel ratio is 0.32, the mixing amount of the water reducing agent is 1 percent of the mass of the cementing material, and the water reducing agent is a solid polycarboxylic acid water reducing agent. The concrete test blocks are respectively used for measuring the compressive strength and the flexural strength of the test sample in the age of 7 days, 14 days and 28 days according to GB/T17671-2021 cement mortar strength test method (ISO method), and the density, the initial setting time and the final setting time of the test sample are simultaneously detected. The results of the density, initial setting time and final setting time measurements of the samples are shown in table 2, and the results of the compressive strength and flexural strength are shown in table 3:
TABLE 2
TABLE 3
The concrete test block is used for detecting the frost resistance of the test block according to the building mortar basic performance test method standard (JGJ/T70-209). The freeze resistance index is shown in Table 4;
TABLE 4
| Number of cycles of freezing and thawing (times) | Strength loss Rate (%) | Mass loss rate (%) | |
| Example 1 | 50 | 8.2 | 0.21 |
| Example 2 | 50 | 7.1 | 0.34 |
| Example 3 | 50 | 8.6 | 0.28 |
| Example 4 | 50 | 8.1 | 0.24 |
| Example 5 | 50 | 7.5 | 0.22 |
| Comparative example 1 | 50 | 22.6 | 1.95 |
| Comparative example 2 | 50 | 21.4 | 2.21 |
| Comparative example 3 | 50 | 29.3 | 2.65 |
| Comparative example 4 | 50 | 27.1 | 2.54 |
As can be seen from the above tables 2-4, the product of the invention has good mechanical properties and short initial setting time, and the building solid waste, the biochar and the modified rubber powder have a synergistic effect, so that the compressive strength and the flexural strength of the product can be jointly improved, and the freezing resistance of the product is improved. Finally, the performance of the cementing material prepared by the invention is better than that of the P0425 cement sold in the market, and the cementing material can be used as a pavement cementing material or a pavement base cementing material and can replace the concrete sold in the market.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The all-solid waste pavement base course cementing material is characterized by comprising the following raw materials in parts by weight:
30-40 parts of sintering flue gas desulfurization ash, 50-70 parts of blast furnace slag, 3-10 parts of tailings, 5-8 parts of building solid waste, 2-8 parts of biochar, 6-10 parts of modified rubber powder and 30-50 parts of carbide slag.
2. The all-solid waste pavement base course cementing material according to claim 1, characterized in that the preparation method of the biochar is as follows:
crushing the agricultural and forestry waste into particles with the particle size of 1-10mm, heating to 200-250 ℃ from normal temperature under the condition of oxygen isolation, preserving heat for 20-45min, heating to 450-620 ℃ again, preserving heat for 2-4h, and then cooling, grinding and sieving, activating by an activating agent, washing and drying to obtain the solid biochar.
3. The all-solid waste pavement base course cementing material of claim 2, characterized in that the agricultural and forestry waste comprises one or more of crop straws, wood chips, bamboo chips and Chinese medicine residues.
4. The all-solid waste pavement base course cementitious material as claimed in claim 2, characterized in that said activator is activated to: and soaking for 2-4 hours by using an acid solution or an alkali solution with the mass concentration of 7-8% as an activating agent.
5. The all-solid waste pavement base layer binding material as claimed in claim 1, wherein the preparation method of the modified rubber powder comprises the following steps:
(1) Grinding the waste tires to 30-50 meshes, adding alkali solution for soaking, and then cleaning to be neutral to obtain alkali-treated rubber powder;
(2) And mixing the rubber powder subjected to alkali treatment with poly dimethyl diallyl ammonium chloride, heating in a water bath, and drying after the reaction is finished to obtain the modified rubber powder.
6. The all-solid waste pavement base cementitious material as claimed in claim 5, wherein the alkali solution has a mass concentration of 7-8%, and the alkali comprises NaOH, KOH and Ca (OH) 2 One or more of the above components are mixed in any proportion;
the soaking time is 50-70min;
the addition ratio of the waste tire to the poly dimethyl diallyl ammonium chloride is 1 (0.9-1.7).
7. The all-solid waste pavement base course cementitious material according to claim 1, characterized in that the construction solid waste comprises waste concrete and/or waste glass.
8. The all-solid waste pavement base cementitious material according to any one of claims 1 to 7, characterized in that the specific surface area of the all-solid waste pavement base cementitious material is 310-380m 2 /kg。
9. The method for preparing the all-solid waste pavement base course cementing material according to claim 8, characterized by comprising the following steps:
1) Respectively grinding the raw materials to a specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 530-600 ℃, then adding the biochar and the modified rubber for uniform mixing, then cooling to 410-450 ℃, then adding the sintered flue gas desulfurization ash, blast furnace slag, tailings and carbide slag for uniform mixing, continuously stirring and heating for 2-4h, and then cooling and grinding to obtain the all-solid-waste pavement base cementing material.
10. The method for preparing the cement material for the all-solid waste pavement base according to claim 9, wherein the grinding in the step 2) is grinding to obtain the cement material with the specific surface area of 310-380m 2 /kg。
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| US20200062646A1 (en) * | 2017-05-02 | 2020-02-27 | National University Of Singapore | Sustainable construction material and method of preparation and use thereof |
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