CN115557716B - Full-solid waste pavement base layer cementing material and preparation method thereof - Google Patents
Full-solid waste pavement base layer cementing material and preparation method thereof Download PDFInfo
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- CN115557716B CN115557716B CN202211348677.5A CN202211348677A CN115557716B CN 115557716 B CN115557716 B CN 115557716B CN 202211348677 A CN202211348677 A CN 202211348677A CN 115557716 B CN115557716 B CN 115557716B
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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
-
- 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
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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
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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
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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
- 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 fully-solid waste pavement base layer 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) Grinding the raw materials respectively to specific surface area of 200-400m 2 /kg; 2) And adding biochar and modified rubber into the building solid waste, uniformly mixing, adding the rest raw materials, continuously stirring and heating for 2-4h, and cooling and grinding to obtain the full-solid waste pavement base layer cementing material. The raw materials in the invention are prepared from industrial waste or agricultural and forestry waste, can replace cement for preparing a pavement base layer, realizes full recycling of solid waste, reduces waste discharge and protects natural environment.
Description
Technical Field
The invention relates to the field of building materials, in particular to a fully-cured waste pavement base layer cementing material and a preparation method thereof.
Background
Cementing materials, also known as cements. Under the physical and chemical actions, the slurry can be changed into a firm stone-like body, and other materials can be glued to prepare a compound solid substance with certain mechanical strength. The cementing material is widely applied to the fields of construction, traffic, water conservancy and the like. In the prior art, the pavement base layer is mostly prepared by using cement concrete, the cement concrete is a cementing material formed by cement and admixture, coarse and fine aggregate is formed by sand stone, and functional assistants such as water reducing agent, expanding agent and the like, the cement concrete is used as a main strength source of the pavement structure and comes from hydration of cement, main active mineral components of the cement are tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite, the active components react with water in a hydration way to generate a cement stone cementing body with certain cementing strength, and the sand stone aggregate is bonded, so that the pavement structure is formed.
However, conventional cement concrete pavements are not wear-resistant, have small deformation properties, are prone to crack generation, and in northern areas, cement concrete pavements are extremely prone to damage, even breakage, by being subjected to repeated freeze-thawing cycles. And the cost and selling price of the ordinary Portland cement are high, and the carbon emission is high.
Therefore, how to provide a cementing material capable of replacing ordinary portland cement is a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a full-solid waste pavement base layer cementing material and a preparation method thereof, so as to solve the problems in the prior art.
In order to achieve the above object, the present invention provides the following solutions:
the full-solid waste pavement base layer 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 comprises the following steps:
crushing agricultural and forestry waste to a grain 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 ℃ and preserving heat for 2-4h, and then cooling, grinding, sieving, activating with an activating agent, washing and drying to obtain the solid biochar.
Preferably, the agricultural and forestry waste comprises one or more of crop straw, wood dust, bamboo dust and Chinese medicinal residues which are mixed in any proportion.
Preferably, the activator is activated as follows: soaking for 2-4 hours by using acid solution or 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.
The beneficial effects are that: the biochar has high specific surface area and is suitable for CO 2 Has adsorption and desorption effects. Improvement ofChange the accumulation in the aggregate and can make CO 2 Through pores in biochar particles reaching the inside of aggregate, CO is promoted 2 And the aggregate is conveyed inside, so that carbonization efficiency is improved, and the strength of the aggregate is improved. In addition, the biochar has lower density, and can reduce the stacking density of aggregate. In addition, 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 modified rubber powder at high temperature, the hydrophilic performance of Gao Gaixing 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 waste tires into alkaline solution for soaking, and then cleaning the waste tires to be neutral to obtain alkali-treated rubber powder;
(2) Mixing the alkali-treated rubber powder with polydimethyl diallyl ammonium chloride, heating in a water bath, and drying after the reaction is finished to obtain the modified rubber powder.
Preferably, 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 following;
the soaking time is 50-70min;
the ratio of the addition amount of the junked tire to the polydimethyl diallyl ammonium chloride is 1 (0.9-1.7).
The beneficial effects are that: in the prior art, the phenomenon that rubber particles float up frequently occurs when waste rubber is used for preparing concrete, the hydrophobic surface of the rubber is removed by firstly carrying out alkali treatment on the rubber particles, the specific surface area is increased, and then the surface modification is carried out on the rubber powder subjected to alkali treatment by using polydimethyl diallyl ammonium chloride, so that the hydrophilicity of the rubber is improved, the rubber can be uniformly mixed with mortar, and the floating and layering of the rubber particles are inhibited. Meanwhile, the modified rubber powder enhances the mechanical property and durability of the fully-cured waste pavement base layer cementing material, and the waste tire often comprises a certain graphene component, so that after the graphene component is mixed with the waste glass, the reaction of components such as silicon dioxide in the waste glass and metal oxide in industrial waste can be promoted, and the production efficiency is improved. Meanwhile, the modified rubber powder has certain toughness, and can greatly improve the flexural strength of the product. And moreover, the polymer material components in the modified rubber powder can prevent the accumulated water on the road surface from penetrating into the cementing material, so that the damage of the freezing of the water in the cementing material to the cementing material is avoided under the condition that the temperature in winter in the north is lower than 0 ℃.
Preferably, the building solid waste comprises waste concrete and/or waste glass.
The beneficial effects are that: in the added building solid waste, the main component in the waste glass is silicon dioxide, and the silicon dioxide can react with metal oxide in the steel slag to generate silicate under the high-temperature condition, so that the hydration 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 fully-solid waste pavement base layer cementing material is 310-380m 2 /kg。
The preparation method of the full-solid waste pavement base layer cementing material comprises the following steps:
1) Grinding the raw materials respectively to 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, the blast furnace slag, the tailings and the carbide slag, uniformly mixing, continuously stirring and heating for 2-4 hours, and cooling and grinding to obtain the full solid waste pavement base layer cementing material.
Preferably, the grinding in step 2) is a grinding to a specific surface area of 310-380m 2 /kg。
The beneficial effects are that: in the invention, firstly, waste glass in the building solid waste is melted, after biochar and modified rubber powder are mixed, the waste glass can be kept in a melted state at 410-450 ℃, and if the temperature is increased, energy waste can be caused. Furthermore, the invention mixes the sintering flue gas desulfurization ash, blast furnace slag, tailings and carbide slag with the building solid waste, the biochar and the modified rubber powder, and enables the silicon dioxide in the glass to react with the metal oxide in the industrial waste at high temperature to generate silicate, and the generation of silicate can promote the hydration of the cementing material.
The invention discloses a fully-solid waste pavement base layer cementing material and a preparation method thereof.
Secondly, the raw materials in the invention can have synergistic effect, and the reaction product of the building solid waste and the industrial waste can improve the hydration of the cementing material, so that the initial setting time of the cementing material is shortened, and meanwhile, the strength of the product can be improved.
Furthermore, the biochar and the modified rubber powder can improve the strength of the cementing material and simultaneously reduce the softening temperature of the building solid waste, thereby saving the use of energy sources in the preparation process and reducing the production cost.
In addition, the cementing material provided by the invention can be used as a cementing material for a pavement base layer and a cementing material for a pavement, and has a wide application range.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof.
The blast furnace slag used in the invention is slag micropowder of Ansteel green resource science and technology Co., ltd; the sintered flue gas desulfurization ash is the desulfurization ash of the large orphan pellet mill;
the other raw materials had the chemical compositions shown in Table 1 below:
table 1:
| CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | MgO | others | |
| Tailings (%) | 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 that: the chemical compositions are all mass percent
Example 1
The full-solid waste pavement base layer cementing material comprises the following raw materials in parts by weight:
30 parts of sintered 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.
The preparation method of the full-solid waste pavement base layer cementing material comprises the following steps:
1. preparation of biochar:
mixing corn straw, wheat straw and rice straw in equal mass ratio, crushing to particle size of 1-10mm, heating to 210 ℃ from normal temperature under the condition of oxygen isolation, preserving heat for 20min, heating to 620 ℃, preserving heat for 2h, cooling to room temperature, grinding, sieving with a 50-mesh sieve, soaking with sulfuric acid solution with mass concentration of 7% as an activating agent for 4h for activation, washing with water to neutrality, and drying at 60-80 ℃ to obtain solid biochar.
2. Preparation of modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the waste tires into a potassium hydroxide solution with the mass concentration of 8% to soak for 50min, and then cleaning the waste tires to be neutral to obtain alkali-treated rubber powder;
(2) Mixing the alkali-treated rubber powder with polydimethyl diallyl ammonium chloride in the mass ratio of 1:1.1, heating in a water bath at 455 deg.c for 6.5 hr, and drying after the reaction to obtain the modified rubber powder.
3. Preparing a fully-solid waste pavement base layer cementing material:
1) Grinding the raw materials respectively to specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 600 ℃, continuously heating to melt the waste glass, adding the biochar and the modified rubber, uniformly mixing, cooling to 410 ℃, adding the sintered flue gas desulfurization ash, the blast furnace slag, the tailings and the carbide slag, uniformly mixing, continuously stirring and heating for 4 hours, and cooling and grinding until the specific surface area is 370m 2 And (3) kg to obtain the full-solid waste pavement base layer cementing material.
Example 2
The full-solid waste pavement base layer cementing material comprises the following raw materials in parts by weight:
40 parts of sintered 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 building solid waste is waste concrete and waste glass.
The preparation method of the full-solid waste pavement base layer cementing material comprises the following steps:
1. preparation of biochar:
mixing corn straw, wheat straw and wood dust in equal mass ratio, crushing to particle size of 1-10mm, heating to 230 ℃ from normal temperature under the condition of oxygen isolation, preserving heat for 30min, heating to 450 ℃, preserving heat for 4h, cooling to room temperature, grinding, sieving with a 50-mesh sieve, soaking with 7% potassium hydroxide solution as an activating agent for 3h for activation, washing with water to neutrality, and drying at 60-80 ℃ to obtain solid biochar.
2. Preparation of modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the waste tires into an alkaline sodium hydroxide solution with the mass concentration of 8% to soak for 60min, and then cleaning the waste tires to be neutral to obtain alkali-treated rubber powder;
(2) Mixing the rubber powder treated by the piece with polydimethyl diallyl ammonium chloride in a mass ratio of 1:1.5, heating in a water bath at 45 ℃ for 7.5 hours, and drying after the reaction is finished to obtain the modified rubber powder.
3. Preparing a fully-solid waste pavement base layer cementing material:
1) Grinding the raw materials respectively to specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 530 ℃, continuously heating to melt the waste glass, adding the biochar and the modified rubber, uniformly mixing, cooling to 450 ℃, adding the sintered flue gas desulfurization ash, the blast furnace slag, the tailings and the carbide slag, uniformly mixing, continuously stirring and heating for 2 hours, and cooling and grinding until the specific surface area is 320m 2 And (3) kg to obtain the full-solid waste pavement base layer cementing material.
Example 3
The full-solid waste pavement base layer cementing material comprises the following raw materials in parts by weight:
35 parts of sintered 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.
The preparation method of the full-solid waste pavement base layer cementing material comprises the following steps:
1. preparation of biochar:
mixing corn straw, bamboo scraps, wood scraps and the like in a mass ratio, crushing the mixture to a grain size of 1-10mm, heating the mixture to 220 ℃ from normal temperature under an oxygen isolation condition, preserving heat for 30min, heating the mixture to 590 ℃, preserving heat for 2.5h, cooling the mixture to room temperature, grinding the mixture to pass through 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 to be neutral by using water, and drying the mixture at 60-80 ℃ to obtain the solid biochar.
2. Preparation of modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the waste tires into a sodium hydroxide solution with the mass concentration of 7% to soak for 70min, and then cleaning the waste tires to be neutral to obtain alkali-treated rubber powder;
(2) Mixing the rubber powder treated by the piece with polydimethyl diallyl ammonium chloride in a mass ratio of 1:1.3, heating in a water bath at 50 ℃ for 7 hours, and drying after the reaction is finished to obtain the modified rubber powder.
3. Preparing a fully-solid waste pavement base layer cementing material:
1) Grinding the raw materials respectively to specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 570 ℃, continuously heating to melt the waste glass, adding the biochar and the modified rubber, uniformly mixing, cooling to 430 ℃, adding the sintered flue gas desulfurization ash, the blast furnace slag, the tailings and the carbide slag, uniformly mixing, continuously stirring and heating for 3 hours, and cooling and grinding to the specific surface area of 350m 2 And (3) kg to obtain the full-solid waste pavement base layer cementing material.
Example 4
The full-solid waste pavement base layer cementing material comprises the following raw materials in parts by weight:
38 parts of sintered 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.
The preparation method of the full-solid waste pavement base layer cementing material comprises the following steps:
1. preparation of biochar:
mixing wood dust, bamboo dust, chinese medicinal residue and rice straw in a mass ratio, crushing to obtain a particle size of 1-10mm, heating to 250 ℃ from normal temperature under an oxygen isolation condition, preserving heat for 20min, heating to 550 ℃, preserving heat for 3h, cooling to room temperature, grinding, sieving with a 40-mesh sieve, soaking with a sodium hydroxide solution with a mass concentration of 7.5% as an activating agent for 3h for activation, washing with water to be neutral, and drying at 60-80 ℃ to obtain solid biochar.
2. Preparation of modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the 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 alkali-treated rubber powder;
(2) Mixing the rubber powder treated by the piece with polydimethyl diallyl ammonium chloride in a mass ratio of 1:0.9, heating in a water bath at 60 ℃ for 6 hours, and drying after the reaction is finished to obtain the modified rubber powder.
3. Preparing a fully-solid waste pavement base layer cementing material:
1) Grinding the raw materials respectively to specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 590 ℃, continuously heating to melt the waste glass, adding the biochar and the modified rubber, uniformly mixing, cooling to 440 ℃, adding the sintered flue gas desulfurization ash, the blast furnace slag, the tailings and the carbide slag, uniformly mixing, continuously stirring and heating for 3.5h, and cooling and pulverizing until the specific surface area is 310m 2 And (3) grinding by kg to obtain the full-solid waste pavement base layer cementing material.
Example 5
The full-solid waste pavement base layer cementing material comprises the following raw materials in parts by weight:
32 parts of sintered 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 building solid waste is waste concrete and waste glass.
The preparation method of the full-solid waste pavement base layer cementing material comprises the following steps:
1. preparation of biochar:
mixing the Chinese medicinal residues, bamboo scraps, wheat straws, rice straws and the like in a mass ratio, crushing the mixture to a particle size of 1-10mm, heating the mixture to 200 ℃ from normal temperature under an oxygen isolation 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 2h with 8% hydrochloric acid solution serving as an activating agent for activation, washing the mixture with water to be neutral, and drying the mixture at 60-80 ℃ to obtain the solid biochar.
2. Preparation of modified rubber powder:
(1) Grinding the waste tires to 30-50 meshes, adding the waste tires into a sodium hydroxide solution with the mass concentration of 7% to soak for 50min, and then cleaning the waste tires to be neutral to obtain alkali-treated rubber powder;
(2) Mixing the rubber powder treated by the piece with polydimethyl diallyl ammonium chloride in a mass ratio of 1:1.7, 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 fully-solid waste pavement base layer cementing material:
1) Grinding the raw materials respectively to specific surface area of 200-400m 2 /kg；
2) Heating the building solid waste to 540 ℃, continuously heating to melt the waste glass, adding the biochar and the modified rubber, uniformly mixing, cooling to 420 ℃, adding the sintered flue gas desulfurization ash, the blast furnace slag, the tailings and the carbide slag, uniformly mixing, continuously stirring and heating for 4 hours, and cooling and grinding until the specific surface area is 380m 2 And (3) kg to obtain the full-solid waste pavement base layer cementing material.
To investigate the effect of the components on the cement, the present invention was verified by the comparative example setup.
Comparative example 1
A cement differing from example 1 only in that:
except for the biochar, the rest steps and parameters were the same as in example 1.
Comparative example 2
A cement differing from example 1 only in that:
the procedure and parameters were the same as in example 1 except that the waste glass was not included.
Comparative example 3
A cement differing from example 1 only in that:
the procedure and parameters were the same as in example 1 except that modified rubber powder was not included.
Comparative example 4
A cement differing from example 1 only in that:
the modified rubber powder was replaced with unmodified rubber powder, and the other steps and parameters were the same as in example 1.
A method for preparing a cement, which differs from example 1 only in that:
the step 2 is as follows: 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
A cementing material is commercial P0425 cement.
The technical effects are as follows:
concrete test pieces were prepared from the binders of examples 1-5 and comparative examples 1-4. The water-gel ratio is 0.32, the mixing amount of the water reducer is 1% of the mass of the cementing material, and the water reducer is a solid polycarboxylate water reducer. The concrete test block is used for respectively measuring the compressive strength and the flexural strength of the test sample in 7 days, 14 days and 28 days according to GB/T17671-2021 cement mortar strength test method (ISO method), and simultaneously detecting the density, initial setting time and final setting time of the test sample. The density, initial setting time and final setting time of the samples are shown in Table 2, and the compressive strength and flexural strength are shown in Table 3:
TABLE 2
TABLE 3 Table 3
The concrete test block is used for detecting the freezing resistance of the test block according to the building mortar basic performance test method standard (JGJ/T70-209). The antifreeze performance index is shown in Table 4;
TABLE 4 Table 4
| Number of freeze thawing cycles | Loss of strength (%) | 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 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 synergistic effect, so that the compressive strength and the flexural strength of the product can be improved together, and the freezing resistance of the product is improved. The performances of the cementing material prepared by the invention are better than those of the commercial P0425 cement, and the cementing material can be used as pavement cementing material or pavement base cementing material and can replace commercial concrete.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (4)
1. The full-solid waste pavement base layer cementing material is characterized by 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 of the modified rubber powder comprises the following steps:
(1) Grinding the waste tires to 30-50 meshes, adding the waste tires into alkaline solution for soaking, and then cleaning the waste tires to be neutral to obtain alkaline treated rubber powder;
(2) Mixing the alkali-treated rubber powder with polydimethyl diallyl ammonium chloride, heating in a water bath, and drying after the reaction is finished to obtain modified rubber powder;
the building solid waste comprises waste concrete and/or waste glass;
the preparation method of the biochar comprises the following steps:
crushing agricultural and forestry waste to a grain 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 ℃ and preserving heat for 2-4h, and then cooling, grinding, sieving, activating with an activating agent, washing and drying to obtain solid biochar;
the agricultural and forestry waste comprises one or more of crop straw, wood dust, bamboo dust and Chinese medicinal residues;
the activating agent is activated by: soaking for 2-4 hours by using acid solution or alkali solution with the mass concentration of 7-8% as an activating agent;
the mass concentration of the alkali solution is 7-8%, and the alkali comprises NaOH, KOH and Ca (OH) 2 One or more of them are mixed in any proportion;
the soaking time is 50-70min;
the ratio of the addition amount of the junked tire to the polydimethyl diallyl ammonium chloride is 1 (0.9-1.7).
2. The fully solid waste pavement base cementing material according to claim 1, wherein the specific surface area of the fully solid waste pavement base cementing material is 310-380m 2 /kg。
3. The method for preparing the full-solid waste pavement base layer cementing material according to claim 1 or 2, which is characterized by comprising the following steps:
1) Grinding the raw materials respectively to 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, the blast furnace slag, the tailings and the carbide slag, uniformly mixing, continuously stirring and heating for 2-4 hours, and cooling and grinding to obtain the full solid waste pavement base layer cementing material.
4. The method for preparing a fully solid waste pavement base cementing material according to claim 3, wherein in the step 2), the powder is ground until the specific surface area is 310-380m 2 /kg。
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| CN111233395A (en) * | 2020-01-18 | 2020-06-05 | 杭州申华混凝土有限公司 | High-strength pervious concrete and preparation method thereof |
| CN111393083A (en) * | 2020-03-25 | 2020-07-10 | 山东省路桥集团有限公司 | Full-solid-waste high-performance concrete and preparation method and application thereof |
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| AU2020101143A4 (en) * | 2020-06-25 | 2020-07-30 | Qian'an Weisheng Solid Waste Environmental Protection Industry Co., Ltd | A Method For Preparing The Fast-Hardening Early-Strength High-Performance All-Solid Waste Concrete |
| CN112125543B (en) * | 2020-09-16 | 2022-03-01 | 张延年 | Composite gel material prepared from bulk solid wastes and preparation method thereof |
| CN112125584B (en) * | 2020-09-18 | 2022-06-07 | 湖北工业大学 | Preparation method of low-hydration-heat green self-leveling concrete |
| CN112777978B (en) * | 2021-01-07 | 2022-05-27 | 沃克豪斯(黄冈)绿色建材有限公司 | High-performance anti-layering pavement rubber concrete |
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| CN111393083A (en) * | 2020-03-25 | 2020-07-10 | 山东省路桥集团有限公司 | Full-solid-waste high-performance concrete and preparation method and application thereof |
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