CN111072329A - Alkali-activated waste residue soil baking-free brick and preparation method thereof - Google Patents

Alkali-activated waste residue soil baking-free brick and preparation method thereof Download PDF

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Publication number
CN111072329A
CN111072329A CN201811216935.8A CN201811216935A CN111072329A CN 111072329 A CN111072329 A CN 111072329A CN 201811216935 A CN201811216935 A CN 201811216935A CN 111072329 A CN111072329 A CN 111072329A
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waste residue
alkali
residue soil
activated
baking
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Inventor
杨政险
季韬
林修清
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Xiamen Hanwo Environmental Protection Technology Co Ltd
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Xiamen Hanwo Environmental Protection Technology Co Ltd
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Priority to CN201811216935.8A priority Critical patent/CN111072329A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention relates to an alkali-activated waste residue soil baking-free brick which is composed of alkali-activated cement, waste residue soil, aggregate, water and an additive. The cement mortar comprises, by mass, 15-40% of alkali-activated cement, 20-60% of waste residue soil, 0-25% of water, 0-40% of aggregate and 0-3% of an additive, wherein the sum of the mass percentages of the components is 100%. The sum of the mass percentages of the components is 100 percent. The alkali-activated waste residue soil baking-free brick has the characteristics of good heat insulating property, light weight, environmental protection, energy conservation and the like, and has good market application prospect. The invention utilizes the waste residue soil as the admixture to prepare the alkali-activated waste residue soil baking-free brick, can better realize the reutilization of the waste residue soil, has better economic benefit and environmental protection benefit compared with the common brick, and has wide market prospect.

Description

Alkali-activated waste residue soil baking-free brick and preparation method thereof
Technical Field
The invention belongs to the field of non-sintered bricks of engineering buildings, and particularly relates to an alkali-activated waste residue soil non-sintered brick.
Background
With the development of urban construction in China, the investment of urban construction is increased, the construction pace is accelerated, and the quantity of urban waste residue soil is increased day by day. Waste muck is a rapidly developing companion in cities. How to transport and treat the waste residue soil and change waste into valuable becomes a major problem which is urgently needed to be solved by building construction enterprises and relevant departments of cities. The waste foundation soil generated by foundation engineering and the subway excavation soil generated in the urban subway construction process are both superior brick making materials. For a long time, the treatment of the muck in China is carried out by transporting the muck to the suburbs of cities by transport vehicles, but the mode not only can generate a large amount of dust in the transportation process to pollute the air of the cities, but also can cause great pollution to the environment where the muck is buried. It is not in accordance with the green concept of sustainable development.
According to the latest statistical result, the construction area of the house in China is more than 6.5 hundred million square meters every year, and 500-600 tons of building waste residues are generated in the construction process of every 1 ten thousand square meters of buildings. According to the calculation, the amount of the building waste slag generated and discharged by construction is nearly 4000 ten thousand tons every year in China. The amount of the building residue soil can account for more than one third of the total amount of the municipal waste. However, the application of the building residue soil in China does not form enough scale, and a large amount of building residue soil is still treated in a traditional open-air stacking or landfill mode. In the technical aspect of muck application, 100 percent of the muck in the United states is comprehensively utilized; in Singapore, 98% of construction waste soil is treated in 2006. They generally sort, reject or pulverize many wastes mixed therein, and then sort and utilize them. However, the utilization of the dregs in China is still in the experimental trial stage, and the construction dregs are not utilized in large scale in the actual engineering. In the national economic system of China, the building industry is a large prop industry, and a large amount of building materials are consumed every year. A large amount of clay is consumed for producing building materials, so that cultivated land is damaged, various levels of governments have issued a lot of documents for forbidding the adoption of cultivated land clay for producing wall materials such as bricks and the like, and the production of the building materials urgently needs to replace soil resources. The foundation soil and the excavation soil of the subway have great similarity with clay, and the foundation soil and the excavation soil of the subway can replace the clay to produce building material products, so that the foundation soil and the excavation soil of the subway gradually become an important development direction of wall materials.
The patent develops the alkali-activated waste residue soil baking-free brick with high strength, good toughness, excellent durability, low cost and excellent comprehensive performance. Compared with other methods for making bricks from dregs, such as the method for making bricks from dregs mentioned in application No. CN201510437567.X, the method disclosed by the invention can effectively fix harmful elements such as heavy metals, organic pollutants and inorganic pollutants in the waste dregs by utilizing the alkali excitation principle, and has obvious environmental protection effect. Compared with the autoclaved muck brick manufacturing method disclosed by the application number CN201710095984.X, the muck brick provided by the invention is simple and convenient in manufacturing conditions, and can be cured at normal temperature after being pressed and formed, so that the time and labor are saved, and the manufacturing cost is greatly saved. The maximum amount of the residue soil brick can reach 60 percent, the utilization rate of the residue soil is high, and the problem of recycling of the waste residue soil is solved to a great extent. And the performance is more excellent than that of the traditional brick.
Disclosure of Invention
Aiming at the defects and problems in the prior art, the invention provides a waste residue soil baking-free brick and a preparation method thereof.
The alkali-activated waste residue soil baking-free brick is composed of alkali-activated cement, waste residue soil, aggregate, water and an additive. The cement mortar comprises, by mass, 15-40% of alkali-activated cement, 20-60% of waste residue soil, 5-25% of water, 0-40% of aggregate and 0-3% of additive, wherein the sum of the mass percentages of the components is 100%.
The alkali-activated cement consists of an activator and an aluminosilicate substance. 2-10% of exciting agent and 90-98% of silicate material. The activator comprises water glass, NaOH, Na2CO3、CaO、Na2SO4And MgO and the like in any combination. The aluminosilicate substance comprises one or more of powdery household garbage incinerator slag, ordinary portland cement, fly ash and silica fume which are combined randomly. The waste residue soil refers to waste foundation soil and subway excavation soil generated in the building construction process, and the water content of the waste residue soil is 5-30%. The aggregate comprises one or more of river sand, natural stones, recycled aggregate, waste ceramic particles and the like in any combination. The additive comprises a high-efficiency water reducing agent, an early strength admixture, a retarder andone or more of the antifreeze agents can be combined randomly.
Alkali-activated cement refers to a cementitious material formed by the action of alkali-activating agents on materials containing pozzolanic activity or latent hydraulic properties. Alkali component (water glass, NaOH, Na)2CO3、CaO、Na2SO4And MgO) is the active ingredient in alkali-activated cements. When the alkali component is added, the alkali component is dissolved in water to release OH-The ions form an alkali solution, and OH in the alkali solution is mixed, stirred and contacted with aluminosilicate substances (slag, metakaolin, fly ash and silica fume)-The ions are rapidly adsorbed on the surface of the aluminosilicate substance particles to promote the surface structure of the aluminosilicate substance to be disintegrated and destroy the vitreous body structure of the aluminosilicate substance, so that Ca-O bonds, Mg-O bonds, Si-O-Si (Al) bonds and Al-O-Al bonds in the aluminosilicate substance are replaced by OH-And break under the action of the catalyst. Since the bond energies of Ca-O bond and Mg-O bond are much lower than those of other bonds, Ca-O bond and Mg-O bond are first destroyed and Ca is generated2+And Mg2+The ions dissolve in alkaline medium, and Ca (OH) can be separated out due to alkalinity2And Mg (OH)2(pre-existing), the Si-O-Si (Al) bond and the Al-O-Al bond can be bonded by OH as the hydration reaction proceeds-Destruction, release of (SiO)4)4-And (AlO)4)5-An anion; when Ca is in solution2+、Mg2+、(SiO4)4-And (AlO)4)4-When the plasma reaches the saturated concentration, hydration products begin to generate, the surface of the aluminosilicate substance is gradually wrapped by the hydration products such as C-S-H and C-A-S-H, and the like, so that gaps among particles of the aluminosilicate substance are filled by the hydration products, and the alkali-activated cement is promoted to have early strength. When the alkali component slowly enters the hydration product film layer on the surface of aluminosilicate substance particles along with the progress of hydration reaction, the vitreous body structure of the aluminosilicate substance is damaged, and because the speed of the hydration product penetrating the film layer is less than the speed of the alkali component entering the film layer, osmotic pressure is formed, the hydration product film layer on the surface of the aluminosilicate substance is damaged, unreacted and incompletely reacted aluminosilicate substance is exposed in an alkali medium, and the aluminosilicate substance further generatesThe raw hydration reaction makes the gaps between aluminosilicate particles smaller, the structure more compact, the polymerization degree of hydration products is also increased, and the strength is improved. When the activator contains MgO, MgO and (AlO)4)5-The polymerization is carried out to form hydrotalcite-like compound (LDH), the LDH has a layered structure and can solidify SO in the waste residue soil4 2-、CO3 2-And Cl-And (4) plasma. The generated C-S-H or zeolite has better curing effect on heavy metals, organic pesticides and other harmful substances in the waste residue soil. The high-efficiency water reducing agent is added to reduce the water-cement ratio and improve the compressive strength of the brick; when the temperature is lower, the early strength agent and the antifreezing agent are added, so that the early strength of the brick can be improved; when the temperature is higher, the retarder is doped, so that the hydration heat and the hydration speed are reduced, and the setting time of the brick making is prolonged. Aggregates such as river sand, natural stones, recycled aggregates, waste ceramic particles and the like have good volume stability, and can reduce the shrinkage and cracking of the waste residue soil baking-free brick.
The invention relates to a waste residue soil baking-free brick, which comprises the following preparation processes:
1) pouring the waste residue soil, aluminosilicate substances and aggregate into a stirrer, and mixing and stirring for 2-3 minutes; 2) pouring water into a stirrer, and mixing and stirring for 2-3 minutes;
3) pouring the excitant into a stirrer, and mixing and stirring for 2-3 minutes;
4) pouring the additive into a stirrer, and mixing and stirring for 2-3 minutes;
5) feeding the uniformly stirred mixture into a brick making machine; and (3) after compression molding, covering with a plastic film, and watering and curing after 12h to obtain the waste residue soil baking-free brick finished product.
Compared with the existing waste residue soil treatment mode and brick making technology, the invention has the following beneficial effects:
1) the waste residue soil is large in using amount, and the waste residue soil is utilized in a large scale, so that the urban land pressure is relieved. Changing waste into valuable and conforming to the sustainable development concept.
2) And the alkali excitation technology is adopted, so that heavy metals in the waste residue soil can be fixed, and secondary pollution to a soil water source is avoided.
3) The method can better realize the reutilization of waste residue soil resources, realize the additional value utilization of solid waste residue soil, realize the short-distance transportation and reduce the dust pollution of the residue soil to cities in the transportation process.
4) The baking-free technology is adopted, the energy consumption is saved, and no greenhouse gas or SO is generated2And the toxic gas pollutes the air, and the environment-friendly effect is obvious.
5) The addition of river sand, natural stones, recycled aggregate and waste ceramic particle aggregate can not only reduce the brick making cost, but also effectively utilize waste resources. The performance and quality of the product can also be improved.
Detailed Description
The alkali-activated waste residue soil baking-free brick is composed of alkali-activated cement, waste residue soil, aggregate, water and an additive. The cement mortar comprises, by mass, 15-40% of alkali-activated cement, 20-60% of waste residue soil, 5-25% of water, 0-40% of aggregate and 0-3% of additive, wherein the sum of the mass percentages of the components is 100%. The alkali-activated cement consists of an activator and an aluminosilicate substance. 2-10% of exciting agent and 90-98% of silicate material. The activator comprises water glass, NaOH, Na2CO3、CaO、Na2SO4And one or more of MgO and the like. The aluminosilicate substance comprises one or more of powdery household garbage incinerator slag, ordinary portland cement, fly ash and silica fume. The waste residue soil refers to waste foundation soil and subway excavation soil generated in the building construction process, and the water content of the waste residue soil is 5-30%. The aggregate comprises one or more of river sand, natural stones, recycled aggregate, waste ceramic particles and the like. The additive comprises one or more of a high-efficiency water reducing agent, an early strength admixture, a retarder and an antifreezing agent.
The waste residue soil baking-free brick of the invention comprises the following preparation processes:
1) pouring the waste residue soil, aluminosilicate substances and aggregate into a stirrer, and mixing and stirring for 2-3 minutes; 2) pouring water into a stirrer, and mixing and stirring for 2-3 minutes;
3) pouring the excitant into a stirrer, and mixing and stirring for 2-3 minutes;
4) pouring the additive into a stirrer, and mixing and stirring for 2-3 minutes;
5) feeding the uniformly stirred mixture into a brick making machine; and (3) after compression molding, covering with a plastic film, and watering and curing after 12h to obtain the waste residue soil baking-free brick finished product.
Example 1
The waste residue soil baking-free brick of the embodiment 1 of the invention is mainly prepared from the following raw materials in percentage by mass: 35% of alkali-activated cement, 45% of waste residue soil with the water content of 12%, 10% of water, 8% of sand and 2% of high-efficiency water reducing agent. The sum of the mass percentages of the components is 100 percent. The alkali-activated cement consists of an activator and aluminosilicate substances. The exciting agent is water glass solid (3%) and Na2SO4(2%) 5% of alkali-activated cement. The aluminosilicate substance is a mixture of 42.5R ordinary portland cement (70%), slag (26%) and powdery household garbage incinerator slag (4%), and accounts for 95% of the alkali-activated cement by mass.
The preparation method of the waste residue soil baking-free brick of the embodiment 1 of the invention specifically comprises the following steps:
(1) pouring waste residue soil, ordinary portland cement, slag, powdery household garbage incinerator slag and sand into a stirrer, and mixing and stirring for 2-3 minutes; pouring water into a stirrer, and mixing and stirring for 2-3 minutes; mixing water glass and Na2SO4Pouring the mixture into a stirrer, and mixing and stirring for 2-3 minutes; and pouring the high-efficiency water reducing agent into the stirrer, and mixing and stirring for 2-3 minutes to obtain a uniformly-stirred mixed material.
(2) And (3) feeding the mixed material obtained in the step (1) into a brick making machine for compression molding.
(3) And (3) covering the brick obtained in the step (2) with a plastic film, and watering and curing after 12 hours to obtain a waste residue soil baking-free brick finished product.
The strength of the 28d baking-free brick is detected, the average compressive strength is 26MPa, the average flexural strength is 9MPa, and the requirements of 'hazardous waste identification standard leaching toxicity identification' (GB 5085.3-2007) are met.
Example 2
The waste residue soil baking-free brick of the embodiment 2 of the invention is mainly prepared from the following raw materials in percentage by mass: 35% of alkali-activated cement, 40% of waste residue soil with the water content of 7%, 15% of water, 7% of waste ceramsite, 1% of antifreezing agent and 2% of early strength agent. The sum of the mass percentages of the components is 100 percent. The alkali-activated cement consists of an activator and aluminosilicate substances. The exciting agent is NaOH (4%) and Na2CO3(3%) 7% of alkali-activated cement. The aluminosilicate substance is a mixture of 42.5R ordinary portland cement (80%), silica fume (10%) and fly ash (10%), and accounts for 93% of the mass of the alkali-activated cement.
The preparation method of the waste residue soil baking-free brick of the embodiment 2 comprises the following specific steps:
(1) pouring the waste residue soil, the ordinary portland cement, the silica fume, the fly ash and the waste ceramsite into a stirrer, and mixing and stirring for 2-3 minutes; pouring water into a stirrer, and mixing and stirring for 2-3 minutes; mixing NaOH and Na2SO4Pouring the mixture into a stirrer, and mixing and stirring for 2-3 minutes; and pouring the antifreezing agent and the early strength agent into a stirrer, and mixing and stirring for 2-3 minutes to obtain a uniformly-stirred mixed material.
(2) And (3) feeding the mixed material obtained in the step (1) into a brick making machine for compression molding.
(3) And (3) covering the brick obtained in the step (2) with a plastic film, and watering and curing after 12 hours to obtain a waste residue soil baking-free brick finished product.
The strength of the 28d baking-free brick is detected, the average compressive strength is 22MPa, the average flexural strength is 7MPa, and the requirements of 'hazardous waste identification standard leaching toxicity identification' (GB 5085.3-2007) are met.
Example 3
The waste residue soil baking-free brick of the embodiment 3 of the invention is mainly prepared from the following raw materials in percentage by mass: 30% of alkali-activated cement, 55% of waste residue soil with the water content of 20%, 5% of water, 8% of stones, 1% of retarder and 1% of high-efficiency water reducing agent. The sum of the mass percentages of the components is 100 percent. The alkali-activated cement consists of an activator and aluminosilicate substances. The exciting agent is NaOH (6%) and MgO (3%), which accounts for 9% of the alkali-activated cement. The aluminosilicate substance is a mixture of 42.5R ordinary portland cement (70%) and powdery slag (30%), and accounts for 91% of the alkali-activated cement by mass.
The preparation method of the waste residue soil baking-free brick of the embodiment 3 of the invention specifically comprises the following steps:
(1) pouring waste residue soil, ordinary portland cement, powdery household garbage incinerator slag and pebbles into a stirrer, and mixing and stirring for 2-3 minutes; pouring water into a stirrer, and mixing and stirring for 2-3 minutes; pouring NaOH and MgO into a stirrer, and mixing and stirring for 2-3 minutes; and pouring the retarder and the high-efficiency water reducing agent into the stirrer, and mixing and stirring for 2-3 minutes to obtain a uniformly-stirred mixed material.
(2) And (3) feeding the mixed material obtained in the step (1) into a brick making machine for compression molding.
(3) And (3) covering the brick obtained in the step (2) with a plastic film, and watering and curing after 12 hours to obtain a waste residue soil baking-free brick finished product.
The strength of the 28d baking-free brick is detected, the average compressive strength is 30MPa, the average flexural strength is 9MPa, and the requirements of 'hazardous waste identification standard leaching toxicity identification' (GB 5085.3-2007) are met.
Example 4
The waste residue soil baking-free brick of the embodiment 4 of the invention is mainly prepared from the following raw materials in percentage by mass: 15% of alkali-activated cement, 60% of waste residue soil with the water content of 5%, 25% of water, 0% of aggregate and 0% of additive. The sum of the mass percentages of the components is 100 percent. The alkali-activated cement consists of an activator and aluminosilicate substances. The exciting agent is NaOH (6%) and CaO (4%), and accounts for 10% of the alkali-activated cement. The aluminosilicate substance is a mixture of 42.5R ordinary portland cement (70%) and powdered slag (30%). Accounts for 90 percent of the mass of the alkali-activated cement.
The preparation method of the waste residue soil baking-free brick of the embodiment 4 of the invention specifically comprises the following steps:
(1) pouring waste residue soil, ordinary portland cement and powdery household garbage incinerator slag into a stirrer, and mixing and stirring for 2-3 minutes; pouring water into a stirrer, and mixing and stirring for 2-3 minutes; pouring NaOH and MgO into a stirrer, and mixing and stirring for 2-3 minutes; and obtaining the uniformly stirred mixed material.
(2) And (3) feeding the mixed material obtained in the step (1) into a brick making machine for compression molding.
(3) And (3) covering the brick obtained in the step (2) with a plastic film, and watering and curing after 12 hours to obtain a waste residue soil baking-free brick finished product.
The strength of the 28d baking-free brick is detected, the average compressive strength is 23MPa, the average flexural strength is 8MPa, and the requirements of 'hazardous waste identification standard leaching toxicity identification' (GB 5085.3-2007) are met.
Example 5
The waste residue soil baking-free brick of the embodiment 5 of the invention is mainly prepared from the following raw materials in percentage by mass: 40% of alkali-activated cement, 20% of waste residue soil with the water content of 30%, 20% of water, 17% of recycled aggregate and 3% of high-efficiency water reducing agent. The sum of the mass percentages of the components is 100 percent. The alkali-activated cement consists of an activator and aluminosilicate substances. The exciting agent is CaO, and accounts for 2% of the alkali-activated cement. The aluminosilicate substance is a mixture of 42.5R ordinary portland cement (70%) and silica fume (30%). Accounts for 98 percent of the mass of the alkali-activated cement.
The preparation method of the waste residue soil baking-free brick of the embodiment 5 of the invention specifically comprises the following steps:
(1) pouring the waste residue soil, the ordinary portland cement, the silica fume and the recycled aggregate into a stirrer, and mixing and stirring for 2-3 minutes; pouring water into a stirrer, and mixing and stirring for 2-3 minutes; pouring CaO into a stirrer, and mixing and stirring for 2-3 minutes; and pouring the high-efficiency water reducing agent into the stirrer, and mixing and stirring for 2-3 minutes to obtain a uniformly-stirred mixed material.
(2) And (3) feeding the mixed material obtained in the step (1) into a brick making machine for compression molding.
(3) And (3) covering the brick obtained in the step (2) with a plastic film, and watering and curing after 12 hours to obtain a waste residue soil baking-free brick finished product.
The strength of the 28d baking-free brick is detected, the average compressive strength is 25MPa, the average flexural strength is 7MPa, and the requirements of 'hazardous waste identification standard leaching toxicity identification' (GB 5085.3-2007) are met.
Example 6
The waste residue soil baking-free brick of the embodiment 6 of the invention is mainly prepared from the following raw materials in percentage by mass: 15% of alkali-activated cement, 29% of waste residue soil with the water content of 30%, 15% of water, 40% of recycled aggregate and 1% of high-efficiency water reducing agent. The sum of the mass percentages of the components is 100 percent. The alkali-activated cement consists of an activator and aluminosilicate substances. The exciting agent is CaO (1%) and MgO (1%), and accounts for 2% of the alkali-activated cement. The aluminosilicate substance is a mixture of 42.5R ordinary portland cement (70%) and silica fume (30%). Accounts for 98 percent of the mass of the alkali-activated cement.
The preparation method of the waste residue soil baking-free brick of the embodiment 6 of the invention specifically comprises the following steps:
(1) pouring the waste residue soil, the ordinary portland cement, the silica fume and the recycled aggregate into a stirrer, and mixing and stirring for 2-3 minutes; pouring water into a stirrer, and mixing and stirring for 2-3 minutes; pouring CaO and MgO into a stirrer, and mixing and stirring for 2-3 minutes; and pouring the high-efficiency water reducing agent into the stirrer, and mixing and stirring for 2-3 minutes to obtain a uniformly-stirred mixed material.
(2) And (3) feeding the mixed material obtained in the step (1) into a brick making machine for compression molding.
(3) And (3) covering the brick obtained in the step (2) with a plastic film, and watering and curing after 12 hours to obtain a waste residue soil baking-free brick finished product.
The strength of the 28d baking-free brick is detected, the average compressive strength is 27MPa, the average flexural strength is 9MPa, and the requirements of 'hazardous waste identification standard leaching toxicity identification' (GB 5085.3-2007) are met.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can make equivalent changes and modifications within the technical scope of the present invention disclosed by the present invention.

Claims (6)

1. The alkali-activated waste residue soil baking-free brick is characterized in that: the alkali-activated waste residue soil baking-free brick is composed of alkali-activated cement, waste residue soil, aggregate, water and an additive; the cement mortar comprises, by mass, 15-40% of alkali-activated cement, 20-60% of waste residue soil, 0-40% of aggregate, 0-25% of water and 0-3% of an additive, wherein the sum of the mass percentages of the components is 100%.
2. The alkali-activated waste residue soil baking-free brick as claimed in claim 1, wherein: the alkali-activated cement consists of 2-10% of an activator and 90-98% of a silicate substance by mass percent; the activator comprises water glass, NaOH, Na2CO3、CaO、Na2SO4And MgO and the like in any combination; the aluminosilicate substance comprises one or more of powdery household garbage incinerator slag, ordinary portland cement, fly ash and silica fume which are combined randomly.
3. The alkali-activated waste residue soil baking-free brick as claimed in claim 1, wherein: the waste residue soil is waste foundation soil or subway excavation soil generated in the building construction process, and the water content of the waste residue soil is 5-30%.
4. The alkali-activated waste residue soil baking-free brick as claimed in claim 1, wherein: the aggregate comprises one or more of river sand, natural stones, recycled aggregate, waste ceramic particles and the like in any combination.
5. The alkali-activated waste residue soil baking-free brick as claimed in claim 1, wherein: the additive comprises one or more of a high-efficiency water reducing agent, an early strength admixture, a retarder and an antifreezing agent.
6. The alkali-activated waste residue soil baking-free brick as claimed in any one of claims 1 to 5, which is prepared by the following steps:
1) pouring the waste residue soil, aluminosilicate substances and aggregate into a stirrer, and mixing and stirring for 2-3 minutes;
2) pouring water into a stirrer, and mixing and stirring for 2-3 minutes;
3) pouring the excitant into a stirrer, and mixing and stirring for 2-3 minutes;
4) pouring the additive into a stirrer, and mixing and stirring for 2-3 minutes;
5) feeding the uniformly stirred mixture into a brick making machine; and (3) after compression molding, covering with a plastic film, and watering and curing after 12h to obtain the waste residue soil baking-free brick finished product.
CN201811216935.8A 2018-10-18 2018-10-18 Alkali-activated waste residue soil baking-free brick and preparation method thereof Pending CN111072329A (en)

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CN112521096A (en) * 2020-12-16 2021-03-19 西安市政道桥建设有限公司 Slag soil baking-free brick and preparation method thereof
CN113105176A (en) * 2021-04-09 2021-07-13 陈惠卿 Muck brick and preparation method thereof
CN113173748A (en) * 2021-06-11 2021-07-27 宁波工程学院 Steel slag desulfurization byproduct solidified sludge-based non-sintered ceramsite and preparation method thereof
CN113416034A (en) * 2021-05-13 2021-09-21 南京工业大学 Freeze-thaw resistant engineering muck baking-free brick and preparation method thereof
CN113651562A (en) * 2021-08-10 2021-11-16 深圳文科园林股份有限公司 Paving brick and preparation method thereof
CN114751700A (en) * 2022-05-09 2022-07-15 武汉理工大学 Baking-free brick produced by utilizing engineering waste soil and process system and method for producing baking-free brick
CN115353336A (en) * 2022-08-25 2022-11-18 同济大学 Alkali-activated non-fired waste residue soil brick recycled mortar and preparation method and application thereof
CN115819058A (en) * 2022-11-02 2023-03-21 北京市首发天人生态景观有限公司 Brick making method by adopting alkaline shield muck
CN116514463A (en) * 2023-04-26 2023-08-01 中铁二局集团有限公司 Full-underground traffic engineering construction site waste regenerated brick and preparation method thereof
CN117024998A (en) * 2023-06-25 2023-11-10 福州大学 Environment-friendly fireproof paint and preparation method thereof
CN117700160A (en) * 2023-11-29 2024-03-15 广东汇泉联骏化学工业有限公司 Waste residue treatment method in methacrylate monomer synthesis process

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112521096A (en) * 2020-12-16 2021-03-19 西安市政道桥建设有限公司 Slag soil baking-free brick and preparation method thereof
CN113105176A (en) * 2021-04-09 2021-07-13 陈惠卿 Muck brick and preparation method thereof
CN113416034A (en) * 2021-05-13 2021-09-21 南京工业大学 Freeze-thaw resistant engineering muck baking-free brick and preparation method thereof
CN113173748A (en) * 2021-06-11 2021-07-27 宁波工程学院 Steel slag desulfurization byproduct solidified sludge-based non-sintered ceramsite and preparation method thereof
CN113651562A (en) * 2021-08-10 2021-11-16 深圳文科园林股份有限公司 Paving brick and preparation method thereof
CN114751700A (en) * 2022-05-09 2022-07-15 武汉理工大学 Baking-free brick produced by utilizing engineering waste soil and process system and method for producing baking-free brick
CN115353336A (en) * 2022-08-25 2022-11-18 同济大学 Alkali-activated non-fired waste residue soil brick recycled mortar and preparation method and application thereof
CN115353336B (en) * 2022-08-25 2023-12-05 同济大学 Regenerated mortar for alkali-activated baking-free waste residue soil bricks and preparation method and application thereof
CN115819058A (en) * 2022-11-02 2023-03-21 北京市首发天人生态景观有限公司 Brick making method by adopting alkaline shield muck
CN116514463A (en) * 2023-04-26 2023-08-01 中铁二局集团有限公司 Full-underground traffic engineering construction site waste regenerated brick and preparation method thereof
CN117024998A (en) * 2023-06-25 2023-11-10 福州大学 Environment-friendly fireproof paint and preparation method thereof
CN117700160A (en) * 2023-11-29 2024-03-15 广东汇泉联骏化学工业有限公司 Waste residue treatment method in methacrylate monomer synthesis process

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