CN114213071A

CN114213071A - Method for preparing baking-free bricks by using building residue soil

Info

Publication number: CN114213071A
Application number: CN202111606755.2A
Authority: CN
Inventors: 冯利; 岳兴山; 冯鹏磊
Original assignee: Shandong Huatong Hydraulic Machinery Co ltd
Current assignee: Shandong Huatong Hydraulic Machinery Co ltd
Priority date: 2021-12-26
Filing date: 2021-12-26
Publication date: 2022-03-22

Abstract

The invention discloses a method for preparing a baking-free brick by using building waste, wherein the baking-free brick is prepared by pressing building waste, cement, solidified powder after ball milling and large building waste crushed materials as raw materials; wherein the mass ratio of the raw materials is as follows: 5% -10% of cement, 1-2% of ball-milling curing agent by mass of the cement, 20-30% of large building garbage crushed objects and the balance of building residue soil; the large building garbage is one or more of building waste bricks, building waste tiles and building waste concrete blocks; the construction residual soil comprises soil for grooving construction and debris except large building garbage removed in removal construction. The preparation method comprises the following steps: preparing materials, preparing a ball-milling curing agent, mixing materials, rolling, forming building blocks and maintaining. The method for preparing the baking-free brick by using the building residue soil has the advantages of low preparation cost and good product quality.

Description

Method for preparing baking-free bricks by using building residue soil

Technical Field

The invention relates to the technical field of baking-free solid bricks, in particular to a method for preparing a baking-free brick by using building residue soil.

Background

The baking-free brick is a novel wall material which is manufactured without high-temperature calcination, one or more of fly ash, cinder, coal gangue, tailing slag, chemical slag or natural sand and tidal marsh mud are usually used as main raw materials, and the traditional baking-free brick has good compressive strength but high preparation cost.

In recent years, due to the generation of a large amount of construction waste, the reuse thereof has become a research hotspot. At present, the existing method for applying construction waste to non-fired solid bricks is that the applied construction waste is mainly waste concrete recycled aggregate, and no relevant application research is carried out on other types of construction waste, such as waste bricks and tiles, waste mortar, slag soil and the like.

The recycled material of the construction waste after the treatment of the soil removal process is redundant soil, the redundant soil accounts for 20-30% of the total amount of the construction waste, but the mud content in the redundant soil is generally 10-30%, and the rest components are waste red bricks, waste concrete, waste mortar and a small amount of impurities, so that the solid bricks prepared by the existing manufacturing method of the baking-free bricks containing the construction waste have low strength and cannot meet the performance requirements of the related solid bricks; the high mud content of redundant soil limits the use of the redundant soil in resource reutilization; in addition, most of the existing preparation methods adopt secondary or even tertiary treatment powder after the soil removal of the construction waste, the required particle size of the powder can be as low as about 0.5mm, and the utilization rate of the construction waste is low.

With the acceleration of the urbanization process and the expansion of urban construction scale in China, the construction industry is confronted with a new rapid development period and generates a large amount of construction waste every year. According to measurement and calculation, 550 tons of construction waste is averagely generated in each 10000 square meters of construction area, the contribution rate of the construction area to the yield of the urban construction waste is 48 percent, and the generation amount of the Chinese construction waste is more than 30 hundred million tons in 2020. At present, the treatment mode of the construction waste in China is still in a relatively extensive landfill and stacking stage. The land occupation of one million tons of construction wastes is 2 mu (the pile height is 5 m), about 15 hundred million construction wastes are generated in China every year at present, and the land resource occupation of one year exceeds 30 million mu. The method for treating the building garbage by landfill has serious defects that firstly, dust and sand fly everywhere to pollute the environment in the processes of clearing and stacking; secondly, the land resources are wasted because the land filling mode occupies national land; thirdly, paint, coating and the like in the construction waste contain harmful substances, and are not easy to decompose after being buried, so that underground water is polluted; fourthly, the landfill mode can also damage the soil structure, causing the surface subsidence. China basically treats construction waste in an unordered management state, and only 10% of the construction waste in most cities is transported to a specified consumption place. The building residue soil usually contains about 10-20% of mud, and the quality of building blocks made of building wastes is seriously influenced. In addition, the content of the components of the construction waste is complex, and the construction waste can be greatly shrunk in the curing and drying processes, so that the brick body is weakened and easy to crack, and the pantothenic acid phenomenon can be frequently generated.

The waste concrete refers to waste concrete blocks produced in the processes of old building (structure) demolition, municipal engineering relocation, pavement repair, major infrastructure transformation, engineering construction and the like, and unqualified concrete produced in commercial concrete plants and prefabricated part plants. The waste concrete is usually treated by open-air stacking or landfill, so that a large area of cultivated land is occupied, and the treatment cost and the transportation cost are high. Dust and sand fly easily in the process of cleaning and stacking the waste concrete, so that the waste concrete seriously pollutes atmosphere and forms secondary pollution. In addition, the production of concrete needs a great amount of gravel aggregate, and with the continuous exploitation of natural gravel, the natural aggregate resource is gradually exhausted, and the ecological environment is increasingly worsened. The recycling of the waste concrete can solve the resource, energy, environment and related social problems caused by the waste concrete, relieve the contradiction between supply and demand of the aggregate, have remarkable social, economic and environmental benefits, and are urgent requirements of environmental protection and sustainable development strategies.

Patent publication No. CN108395166A discloses a baking-free brick made of construction waste

The raw materials in parts by weight are as follows: 20-80 parts of slag soil, 2-30 parts of cement, 3-30 parts of sticky powder, 1-20 parts of an adhesive, 5-30 parts of lime, 5-15 parts of solid construction waste, 0.1-10 parts of bamboo fiber, 0.1-20 parts of silicon powder, 1-20 parts of brown sugar, 0.02-0.4 part of a water reducing agent, 1-5 parts of polyacrylamide, 1-5 parts of triethanolamine, 1-5 parts of sodium chloride, 1-5 parts of calcium lignosulfonate and 0.1-2 parts of calcium stearate; the adhesive is at least one of glutinous rice pulp or paper pulp adhesive. Its disadvantages are high cost and long curing time.

Patent publication No. CN112174633A discloses a baking-free brick, which is composed of the following raw materials in parts by weight: 800 portions of building residue soil and 1000 portions of building residue soil; 200300 parts of rice field straw; 80-120 parts of cement; 22-30 parts of slaked lime; 2535 parts of gypsum; 8-12 parts of a curing agent; 3-5 parts of an active agent; 1-3 parts of a weather resistance agent; 100 portions of water and 150 portions of water. Sodium lignosulfonate is a natural high-molecular polymer, an anionic surfactant, has strong dispersing capacity and is suitable for dispersing solids in an aqueous medium. The sodium lignosulfonate can be adsorbed on the surfaces of various solid particles and can perform metal ion exchange, sodium lignosulfonate is used as a dispersing agent and a wetting agent, a series of physical and chemical reactions are generated after the sodium lignosulfonate is mixed with a soil body, and a thin water film wrapped on the surface of each fine particle is removed, so that the engineering property of the soil body is changed, and the strength and the water resistance of the baking-free brick are effectively improved. The disadvantages are that: the brick is made of slurry before forming, the water content is high, the manufacturing process is complex, watering and maintenance are needed, and the maintenance period is long.

The patent with publication number CN109020318B discloses a baking-free solid brick utilizing redundant soil of construction waste and a preparation method thereof, and the baking-free solid brick comprises the following raw material components in parts by weight: 5-20 parts of cement, 70-90 parts of construction waste redundant soil and 5-13 parts of water, wherein the construction waste redundant soil comprises the following raw material components in parts by weight: 50-70 parts of waste bricks and tiles, 10-20 parts of waste concrete, 10-20 parts of waste mortar and 5-10 parts of slag, wherein the mud content of the redundant soil of the building waste is 10-20%, the water content is 3-10%, the particle size of the waste bricks and tiles is not more than 10mm, the mass of the raw materials with the particle size of more than 4.75mm accounts for not less than 50% of the total mass of the waste bricks and tiles, the particle size of the waste concrete is not more than 10mm, the mass of the raw materials with the particle size of more than 4.75mm accounts for not less than 30% of the total mass of the waste concrete, the particle size of the waste mortar is not more than 10mm, the mass of the raw materials with the particle size of less than 2.36mm accounts for not more than 30% of the total mass of the waste mortar, the particle size of the slag is not more than 2.36mm, and the mass of the raw materials with the particle size of less than 0.075mm accounts for not less than 60% of the total mass of the slag. The disadvantages are that the raw material contains 10-20% of mud, the cementing material is only cement, the raw material contains a large amount of waste concrete, the performance of the waste concrete is not fully utilized, and the like, so that the consumption of the cement is large, and the manufacturing cost is high. In addition, waste bricks and tiles, waste concrete, waste mortar and waste soil need to be classified and collected, the classification and collection of the waste bricks and tiles, the waste concrete, the waste mortar and the waste soil is very difficult to realize, labor and time are wasted, and particularly, the waste concrete and the waste bricks and tiles are difficult to separate and difficult to realize.

The patent with publication number CN107098634A discloses a production method of a subway shield residue soil baking-free brick, which is characterized by comprising the following steps: step 1: mixing and stirring 60-70% of shield dry soil and 15-20% of shield solid slag uniformly according to the weight ratio; step 2, adding 6-10% of hydrated lime, 8-12% of coal ash and 0.5% of straws into the raw materials in the step 1, uniformly mixing and stirring the materials according to the weight ratio, and then concentrating the materials into a pool for aging for not less than 4 hours; step 3, 5-8% of cement and 3-5% of soil curing agent are added into the raw materials in the step 2, and the raw materials are uniformly mixed and stirred according to the weight ratio and then mechanically rolled for no less than 10 minutes; the mixed cementing material is stored for no less than 2 hours for later use; step 4, pressing and forming by adopting baking-free brick machine equipment; the pressure value range during pressing is 15-20 MPa. The method has the defects that the method needs to be concentrated into a pool for aging, and the process is relatively complex.

Disclosure of Invention

The invention aims to provide a preparation method of a building residue soil baking-free brick, which is low in preparation cost and a process for preparing a baking-free solid brick with good compressive strength.

In order to solve the technical problems, the invention adopts the following technical scheme.

A method for preparing baking-free bricks by using building waste is characterized in that the building waste baking-free bricks are prepared by pressing building waste, cement, solidified powder after ball milling and large building waste crushed materials as raw materials; wherein the mass ratio of the raw materials is as follows: 5% -10% of cement, 1-2% of ball-milling curing agent by mass of the cement, 20-30% of large building garbage crushed objects and the balance of building residue soil; the large building garbage is one or more of building waste bricks, building waste tiles and building waste concrete blocks, and the diameter of the large building garbage is not less than 10 mm; the building muck comprises soil for grooving construction and chips except large building wastes removed in removal construction, and the diameter of the building muck is not more than 10 mm.

The solidified powder after ball milling comprises the following components in percentage by weight: 5-10% of powdery sodium silicate, 1-2% of dioctyl sodium sulfosuccinate, 1.3-3% of lignosulfonate, 3-6% of polyacrylamide, 10-20% of light-burned magnesium oxide, 5-10% of quicklime, 5-8% of fly ash and the balance of calcined waste mortar.

The preparation method comprises the following steps:

step 1 Material preparation

Putting the waste bricks and tiles into a crusher to be crushed to obtain large blocks of broken building garbage, wherein the particle size of the large blocks of broken building garbage is not more than 10mm and not less than 5 mm;

the construction waste soil is crushed, and the particle size of the crushed construction waste soil is not more than 2 mm.

Step 2: preparation of ball-milling curing agent

Calcining waste mortar at 700-900 ℃ to prepare calcined waste mortar, putting the curing agent raw material into a ball mill for ball milling, and grinding to obtain the waste mortar with the specific surface area of 400m²/kg～600m²/kg。

And step 3: mixing material

Building residue soil, cement, solidified powder after ball milling, large blocks of broken building garbage are mixed evenly after water is added.

And 4, step 4: wheel mill

And putting the obtained material into an edge runner mill, and milling for 10-14 min.

And 5: building block forming

Putting the material after wheel rolling into a forming machine for high static pressure auxiliary vibration forming to form a green brick; the high static pressure auxiliary vibration molding is carried out by adopting a light, stable and triple double-sided three-time pressing mode; the molding pressure is controlled to be 10-20 Mpa.

And 6, maintaining.

As a preferable technical scheme, the step 1 further comprises the step of screening again after the crushed large building garbage is put into the crusher to be crushed.

As a preferable technical scheme, the method also comprises the step of screening again after the building residue soil is crushed in the step 1.

As a preferred technical scheme, the specific curing method is as follows: atomizing and spraying water within 3 days after molding, and directly spraying water 3 days later until the moisturizing and curing are finished, and thoroughly pouring; when the temperature is more than or equal to 20 ℃, the moisture retention and maintenance is less than or equal to 14 days, and when the temperature is less than 20 ℃, the moisture retention and maintenance is less than or equal to 7 days; when the moisture preservation curing humidity is less than 75%, sprinkling water on the surface of the brick pile for curing (once in the morning, in the middle and at night); naturally drying and maintaining the mixture for the rest time.

As a preferred technical scheme, the whole curing time is not less than 28 days.

As a preferred technical scheme, in the step 6, when the density of the material after wheel milling is more than 1200Kg/m³During the first-time forming, the pressure is controlled to be 18-18.5 Mpa, the exciting force of a brick making machine is 50-58 kN, and the amplitude is 1-2 mm; controlling the second molding pressure to be 18.5-19.2 Mpa, controlling the exciting force of the brick making machine to be 50-58 kN, and controlling the amplitude to be 1-2 mm; controlling the third forming pressure to be 19.2-20 Mpa, wherein the exciting force of the brick making machine is 50-58 kN, and the amplitude is 1-2 mm; the pressure maintaining time for each molding is 30-40S;

when the density of the material after wheel milling is less than 1200Kg/m³The first-time forming pressure is controlled to be 10-11 Mpa, the exciting force of a brick making machine is 50-58 kN, and the amplitude is 1-2 mm; controlling the second molding pressure to be 11-12 Mpa, controlling the exciting force of the brick making machine to be 50-58 kN, and controlling the amplitude to be 1-2 mm; controlling the third forming pressure to be 12.5-15 Mpa, controlling the exciting force of the brick making machine to be 50-58 kN, and controlling the amplitude to be 1-2 mm; the pressure maintaining time for each molding is 30-40S.

As a preferred technical scheme, in the step 3, the water content of the uniformly mixed materials is not more than 10%.

Compared with the prior art, the invention has the following beneficial effects:

1. the baking-free brick is prepared by selecting the muck and various construction wastes, the indexes such as compressive strength and the like meet the national standard, and the preparation cost is low. The modulus of elasticity and flexibility are increased due to the increased binding force with the aggregate. Because the continuous capillary flow and capillary water rising channels are blocked, no water permeates and the water absorption rate is low. The test expansion coefficient is about 1mm, which is one tenth of the GB 12:1978 standard, the hot-pressing expansion is about 0.01%, which is 1/80 of the American ASTMC150-84 standard, and the stability is extremely strong. The sulfate compound in the aggregate has impermeability after being wrapped, hydrated, corroded and crystallized, and the harmful salt compound in the aggregate is prevented without being mixed with water.

2. The construction waste types utilized by the invention comprise large building waste broken objects, building waste residues and the like, the utilization range of the construction waste is wide, and the burden of various types of construction waste on the environment can be solved to a greater extent; and the fertilizer after the construction waste is crushed is used, so that the produced solid brick has light volume weight, good thermal insulation performance, high strength, low water absorption and good softening performance, can reach the national standard of the building brick, is green, environment-friendly and pollution-free, realizes the resource recycling of the construction waste, and has great economic benefit and social benefit.

3. In the invention, the hardness and the size of the broken materials and the dregs of the large building garbage are different. In the material mixing link, the crushed waste bricks and tiles form aggregates, the surfaces are rough, irregular and honeycomb, so that the surface combination is good, and the strength of the bricks is increased. The rest materials and the aggregate particles are matched with each other and embedded with each other, the gaps formed by the primary particles are filled by the secondary particles, the gaps formed by the secondary particles are filled by the next-stage particles, and the primary particles are filled down, so that the closest packing, the minimum void ratio and the minimum center mass content are achieved, and the purposes of improving the strength, toughness and durability of the materials and saving the cementing materials are achieved.

4. The construction waste material of the invention contains about 10-20% of mud, therefore, the curing agent comprises the curing powder formulation after the wheel milling, and the curing powder formulation comprises the following components in percentage by weight: 5-10% of powdery sodium silicate, 1-2% of dioctyl sodium sulfosuccinate, 1.3-3% of lignosulfonate, 3-6% of polyacrylamide, 10-20% of light-burned magnesium oxide, 5-10% of quicklime, 5-8% of fly ash and the balance of calcined waste mortar.

The powdery sodium silicate can be quickly dissolved, can not shrink greatly in the curing and drying processes, enhances the strength of the brick body, and can not generate the pantothenic acid phenomenon. Quicklime generates Ca (OH) when meeting water₂And the self-adhesive has good gelling property. The fly ash is not only mixed with water in cementCa (OH) produced by hydration of mud clinker₂Besides the reaction, the calcium silicate hydrate and the calcium aluminate hydrate can also slowly react with other hydrate to generate calcium silicate hydrate and calcium aluminate hydrate, so that the long-term strength of the baking-free brick is further enhanced. The light calcined magnesia is prepared by calcining magnesite, brucite and magnesium hydroxide extracted from seawater or brine at about 800-1000 ℃ to decompose and discharge CO₂Or H₂And (C) is derived from O. Also called light burned magnesia, caustic magnesia or light burned magnesia, commonly called magnesia powder. The light-burned magnesia powder has loose texture and high chemical activity, can be used for manufacturing magnesia cement, magnesite building material products, heat insulation materials and the like, and is an intermediate product for producing high-quality magnesia by a two-step calcining method. The waste mortar contains a certain amount of ungelled cement materials, the specific surface area of the ungelled cement materials is larger than that of the original cement powder through ball milling, the activity of the ungelled cement materials is activated, and the activity of ungelled particles in the waste mortar is activated again through adding excitation materials such as light-burned magnesium oxide, aluminum chloride, dioctyl sodium sulfosuccinate, lignosulfonate and polyacrylamide, so that the quality of the brick is improved. The use of the cementing materials after ball milling effectively reduces the use amount of cement, and the waste mortar is calcined, so that the cost is fully utilized, and the cost is effectively reduced. Polyacrylamide and dioctyl sodium sulfosuccinate are mixed with molecular chains of the polyacrylamide to be fixed on the surfaces of different muck particles, polymer bridges are formed among the particles to enable the particles to form aggregates, and various mechanical, physical and chemical actions between the molecular chains of the polyacrylamide and dispersed phases can be enhanced to pull the dispersed phases together to form a net shape. The polymerization agent is water solution, and is mixed with residual soil and cement and granulated to form stable soil particles. According to the invention, the waste mortar is calcined at 700-900 ℃ to prepare calcined waste mortar, the characteristic of easy ball milling of the calcined waste mortar is fully utilized, the calcined waste mortar is used as a main body of a cementing material, and the calcined waste mortar is ball milled with other cementing materials, so that the specific surface area reaches 400m²/kg～600m²The/kg of the waste mortar exceeds the fineness of cement, the chemical components of the waste mortar are complex, and compared with an exciting agent, the ball milling can give full play to the chemical activity of the waste mortar, and particularly, the hydration reaction is quickerQuickly change the hydrophilic characteristic of the muck and have better curing effect.

5. The wheel milling process has the advantages that:

the mud blocks can be further pulverized, so that the mud skin on the surface of the aggregate particles falls off or new slag is exposed. Because the content of the mud in the construction waste material is about 10-20%, the mud blocks exist in the solidified body, which is equivalent to the existence of cavities in the solidified block, the pressure-bearing area of the solidified block is reduced, the strength is reduced, and the water absorption of the solidified body is increased, the softening coefficient is reduced, and other related performances are deteriorated. The presence of mud interfaces between the particles greatly reduces the polymerization, weakening the cohesion between the particles and the aggregate, also leading to a deterioration in the mechanical and related properties.

The mud blocks influence the continuous consistency of the density of the blocks in the solidified blocks, and crack tips are easily formed under the action of external force, so that the resistance of the solidified blocks is reduced to form cracks. Therefore, when the mixture is mixed by common stirring, the mud blocks which are difficult to crush and the mud skin coated on the surface of the aggregate particles are peeled off, and the wheel roller is used as a mixing tool, so that the mixture is uniformly mixed, the mud blocks can be crushed into powder by the wheel roller, the mud skin coated on the surface of the aggregate particles is peeled off, the potential of the curing agent for strengthening the technical performance of the curing body is fully exerted, and the related performance indexes are reached.

The mixture is subjected to the rolling force of the rolling wheel in the edge runner mill, can be compacted, and has reduced volume, greatly improved volume density, higher volume density and better brick performance. Meanwhile, the wheel milling can improve the formability of the material and prevent the bricks from cracking when being pressed. The mix contains a large amount of air which increases with the bulk of the material and decreases with its density. During the forming, the air is compressed by a brick press to generate pressure, and a compressed air layer is formed in the green brick to cause the green body to crack. The higher the molding pressure, the more severe the delamination. This spalling increases with increasing gas content of the material. If the porosity of the formed green brick is 10%, 25% of air is discharged in the pressurizing process, and the volume density of the pressed green brick is 1500 kg/cubic meter, the pressure generated by the compressed air in the green brick can reach 50N/square meter. The green brick which is just formed and is not hardened is difficult to resist the pressure of compressed air in the green brick, and the delamination is inevitable. To avoid or reduce the delamination, it is passive to reduce the forming pressure and control the forming pressure within a range in which the delamination does not form, i.e., to reduce the limit forming pressure. This in turn causes the strength of the tile to decrease. The best proposal for solving the contradiction is to grind the material to make it compact, remove most of the air in the material and reduce the air content of the material. Because the air content is reduced, the compressed air during molding is reduced, the pressure generated after compression is small, and the lamination crack can not occur. In addition, if the material is not rolled, the water demand is large in a loose state, and the molding moisture is difficult to reduce. But if the roller is rolled and compacted, the water content of the material is greatly reduced, the material can be wetted by using little water, and good forming under low water-material ratio is realized. In general, the molding moisture of the material can be reduced by more than 50% by using wheel milling compared with the material without wheel milling, so that the mixture is treated by using the wheel milling process, and the quality of the brick is improved well.

Curing modification principle: is a comprehensive process of mixing action, polymerization action, hydration and corrosion action and chemical action with a solidification object. The solidifying agent wraps the aggregates, namely the aggregates are bonded together by a film structure formed by the solidifying agent, so that the solidifying and polymerizing actions are realized, and the chemical action process of hydration and corrosion is to make the solidified object denaturalized or crystallized to form a stable structure layer. The wheel mill integrates the crushing, rolling, kneading, mixing, homogenizing and plasticizing functions of the materials, so that the materials can meet the requirements of humidity, activation, homogenization and plasticization before molding within 10-14 minutes.

6. Different building garbage wastes are respectively subjected to different molding pressures according to volume weight, so that the lightweight property of the brick is prevented from being lost due to excessive compression of the lightweight aggregate.

The pressing mode of the invention has the characteristics that: firstly, double-sided multiple pressing is an ideal and scientific forming mode, and is particularly needed for fine materials. Secondly, the design of the pressing mode also needs to comply with a light, stable and triple double-sided three-time pressing mode. The baking-free brick produced by the method has high strength, low water absorption, good frost resistance, saving of cementing materials, beautiful appearance and comprehensive performance advantages. Thirdly, a static pressure auxiliary vibration mode is adopted, vibration is utilized, and the problem that the structure of the brick is damaged by pressure generated by compressed air in the blank due to overlarge vibration pressure in the forming process, and the brick is layered is solved effectively. The concrete static pressure vibration-assisted forming machine adopts the static pressure vibration-assisted forming machine disclosed in the patent CN202020666908.7 applied by the company.

Detailed Description

Example 1. A method for preparing baking-free bricks by using building waste is characterized in that the building waste baking-free bricks are prepared by pressing building waste, cement, solidified powder after ball milling and large building waste crushed materials as raw materials; wherein the mass ratio of the raw materials is as follows: 5% of cement; 2% of the mass of the cement by ball milling and solidifying agent; 20 percent of large building garbage crushed objects and the balance of building residue soil; the large building garbage is building waste bricks, building waste tiles and building waste concrete blocks, and the diameter of the large building garbage is not less than 10 mm; the building residue soil is debris except large building garbage removed in the removal construction, and the diameter of the building residue soil is not more than 10 mm.

The solidified powder after ball milling comprises the following components in percentage by weight: 5 percent of powdery sodium silicate, 1 percent of dioctyl sodium sulfosuccinate, 1.3 percent of lignosulfonate, 3 percent of polyacrylamide, 10 percent of light-burned magnesia, 5 percent of quicklime, 5 percent of fly ash and the balance of calcined waste mortar.

The preparation method comprises the following steps:

step 1 Material preparation

Step 2: preparation of ball-milling curing agent

Calcining waste mortar at 700 ℃ to prepare calcined waste mortar, putting the curing agent raw material into a ball mill for ball milling, and levigating to obtain the waste mortar with the specific surface area of 600m²/kg。

And step 3: mixing material

And 4, step 4: wheel mill

And putting the obtained material into an edge runner mill, and milling for 10 min.

And 5: building block forming

Putting the material after wheel rolling into a forming machine for high static pressure auxiliary vibration forming to form a green brick; the high static pressure auxiliary vibration molding is carried out by adopting a light, stable and triple double-sided three-time pressing mode.

And 6, maintaining.

In the step 1, the step of screening again is further included after the large building garbage crushed object is put into the crusher to be crushed.

In the step 1, the construction residual soil is crushed and then sieved again.

The specific maintenance mode is as follows: atomizing and spraying water within 3 days after molding, and directly spraying water 3 days later until the moisturizing and curing are finished, and thoroughly pouring; when the temperature is more than or equal to 20 ℃, the moisture retention and maintenance is less than or equal to 14 days, and when the temperature is less than 20 ℃, the moisture retention and maintenance is less than or equal to 7 days; when the moisture preservation curing humidity is less than 75%, sprinkling water on the surface of the brick pile for curing (once in the morning, in the middle and at night); naturally drying and maintaining the mixture for the rest time.

The whole curing time is not less than 28 days.

The density of the material after wheel milling is less than 1200Kg/m³. The first molding pressure is controlled to be 10Mpa, the exciting force of a brick making machine is 50kN, and the amplitude is 1 mm; the second molding pressure is controlled to be 11Mpa, the exciting force of the brick making machine is 50kN, and the amplitude is 1 mm; controlling the third molding pressure at 12.5Mpa, the exciting force of the brick making machine at 50kN, and the amplitude at 1 mm; the dwell time for each molding is 30S.

In the step 3, the content of the uniformly mixed materials is 10%.

And (3) detection results:

the produced baking-free brick has high strength, low water absorption, good frost resistance, and can save cementing materials, make the brick beautiful in appearance and have comprehensive performance advantages.

Example 2. A method for preparing baking-free bricks by using building waste is characterized in that the building waste baking-free bricks are prepared by pressing building waste, cement, solidified powder after ball milling and large building waste crushed materials as raw materials; wherein the mass ratio of the raw materials is as follows: 5% of cement, 1% of ball-milling curing agent based on the mass of the cement, 20% of large building garbage crushed objects and the balance of building residue soil; the large building garbage is one or more of building waste bricks, building waste tiles and building waste concrete blocks, and the diameter of the large building garbage is not less than 10 mm; the building muck comprises soil for grooving construction, and substances except large building wastes removed in the removal construction have the diameter of not more than 10 mm. The soil for slotting construction is clay with a volume weight of 1300Kg-1350Kg/m³。

The solidified powder after ball milling comprises the following components in percentage by weight: 10% of powdery sodium silicate, 2% of dioctyl sodium sulfosuccinate, 13% of lignosulfonate, 6% of polyacrylamide, 20% of light-burned magnesium oxide, 10% of quicklime, 8% of fly ash and the balance of calcined waste mortar.

The preparation method comprises the following steps:

step 1 Material preparation

Step 2: preparation of ball-milling curing agent

Calcining the waste mortar at 900 ℃ to prepare calcined waste mortar, putting the curing agent raw material into a ball mill for ball milling, and grinding to obtain the waste mortar with the specific surface area of 400/kg.

And step 3: mixing material

And 4, step 4: wheel mill

Placing the obtained material into an edge runner mill, and milling for 14 min.

And 5: building block forming

And 6, maintaining.

In the step 1, the construction residual soil is crushed and then sieved again.

The whole curing time is not less than 28 days.

The density of the material after wheel milling is more than 1200Kg/m³. The first molding pressure is controlled at 18Mpa, the exciting force of the brick making machine is 50kN, and the amplitude is 2 mm; controlling the second molding pressure at 18.5-Mpa, the exciting force of the brick making machine is 50kN, and the amplitude is 2 mm; controlling the third molding pressure at 19.2Mpa, controlling the exciting force of the brick molding machine to be 50kN, the amplitude to be 2mm and the vibration frequency to be 70 times/min; the dwell time for each molding is 30S.

After the wheel milling is completed, the water content of the material is 9%.

And (3) detection results:

Example 3. A method for preparing baking-free bricks by using building waste is characterized in that the building waste baking-free bricks are prepared by pressing building waste, cement, solidified powder after ball milling and large building waste crushed materials as raw materials; wherein the mass ratio of the raw materials is as follows: 10% of cement, 2% of ball-milling curing agent based on the mass of the cement, 30% of large building garbage crushed objects and the balance of building residue soil; the large building garbage is one or more of building waste bricks, building waste tiles and building waste concrete blocks, and the diameter of the large building garbage is not less than 10 mm; the building residue soil is debris except large building garbage removed in the removal construction, and the diameter of the building residue soil is not more than 10 mm.

The solidified powder after ball milling comprises the following components in percentage by weight: 10 percent of powdery sodium silicate, 2 percent of sodium dioctyl sulfosuccinate, 1.3 percent of lignosulfonate, 6 percent of polyacrylamide, 20 percent of light-burned magnesia, 10 percent of quicklime, 5 percent of fly ash and the balance of calcined waste mortar.

The preparation method comprises the following steps:

step 1 Material preparation

Step 2: preparation of ball-milling curing agent

Calcining waste mortar at 700-900 ℃ to prepare calcined waste mortar, putting the curing agent raw material into a ball mill for ball milling, and levigating to obtain the waste mortar with the specific surface area of 600m²/kg。

And step 3: mixing material

And 4, step 4: wheel mill

Placing the obtained material into an edge runner mill, and milling for 14 min.

And 5: building block forming

And 6, maintaining.

In the step 1, the construction residual soil is crushed and then sieved again.

The whole curing time is not less than 28 days.

The density of the material after wheel milling is less than 1200Kg/m³. The first molding pressure is controlled to be 11Mpa, the exciting force of a brick making machine is 58kN, and the amplitude is 2 mm; the second molding pressure is controlled at 12Mpa, the exciting force of the brick making machine is 58kN, and the amplitude is 2 mm; the third molding pressure is controlled to be 15Mpa, the exciting force of the brick making machine is 58kN, and the amplitude is 2 mm; the dwell time for each molding was 40S.

After the wheel milling is completed, the water content of the material is 9%.

And (3) detection results:

Example 4. A method for preparing baking-free bricks by using building waste is characterized in that the building waste baking-free bricks are prepared by pressing building waste, cement, solidified powder after ball milling and large building waste crushed materials as raw materials; wherein the mass ratio of the raw materials is as follows: 8 percent of cement, 1.5 percent of ball-milling curing agent based on the mass of the cement, and 25 percent of ball-milling curing agent% of large building garbage crushed materials and the balance of building residue soil; the large building garbage is one or more of building waste bricks, building waste tiles and building waste concrete blocks, and the diameter of the large building garbage is not less than 10 mm; the building muck comprises soil for grooving construction, and the diameter of the building muck is not more than 10 mm. The soil for grooving construction is clay sand with the volume weight of about 1.3t/m³。

The solidified powder after ball milling comprises the following components in percentage by weight: 8 percent of powdery sodium silicate, 2 percent of dioctyl sodium sulfosuccinate, 2 percent of lignosulfonate, 5 percent of polyacrylamide, 15 percent of light-burned magnesia, 8 percent of quicklime, 8 percent of fly ash and the balance of calcined waste mortar.

The preparation method comprises the following steps:

step 1 Material preparation

Step 2: preparation of ball-milling curing agent

Calcining waste mortar at 800 deg.C to obtain calcined waste mortar, ball milling the raw material of solidifying agent in ball mill, grinding to obtain powder with specific surface area of 500m²/kg。

And step 3: mixing material

And 4, step 4: wheel mill

And (4) placing the obtained material into an edge runner mill, and milling for 12 min.

And 5: building block forming

And 6, maintaining.

In the step 1, the construction residual soil is crushed and then sieved again.

The whole curing time is not less than 28 days.

In step 6, when the density of the material after wheel milling is more than 1200Kg/m³During the first molding, the pressure is controlled at 18.5Mpa, the exciting force of a brick making machine is 58kN, and the amplitude is 2 mm; controlling the second molding pressure at 19.2Mpa, the exciting force of the brick making machine at 58kN, and the amplitude at 2 mm; controlling the third molding pressure to be 20Mpa, controlling the exciting force of the brick making machine to be 58kN, and controlling the amplitude to be 2 mm; the dwell time for each molding was 40S.

After the wheel milling is completed, the water content of the material is 9%.

And (3) detection results:

Example 5. A method for preparing baking-free bricks by using building waste is characterized in that the building waste baking-free bricks are prepared by pressing building waste, cement, solidified powder after ball milling and large building waste crushed materials as raw materials; wherein the mass ratio of the raw materials is as follows: 10% of cement, 2% of ball-milling curing agent based on the mass of the cement, 20% of large building garbage crushed objects and the balance of building residue soil; the large building garbage is one or more of building waste bricks, building waste tiles and building waste concrete blocks, and the diameter of the large building garbage is not less than 10 mm; the building residue soil is residue soil except for removing large building wastes in the removal construction, and the diameter of the residue soil is not more than 10 mm.

The solidified powder after ball milling comprises the following components in percentage by weight: 5 percent of powdery sodium silicate, 1 percent of dioctyl sodium sulfosuccinate, 3 percent of lignosulfonate, 6 percent of polyacrylamide, 10 percent of light-burned magnesia, 5 percent of quicklime, 8 percent of fly ash and the balance of calcined waste mortar.

The preparation method comprises the following steps:

step 1 Material preparation

Step 2: preparation of ball-milling curing agent

Calcining waste mortar at 900 ℃ to prepare calcined waste mortar, putting the curing agent raw material into a ball mill for ball milling, and grinding to obtain the waste mortar with the specific surface area of 400m²/kg。

And step 3: mixing material

And 4, step 4: wheel mill

And 5: building block forming

And 6, maintaining.

In the step 1, the construction residual soil is crushed and then sieved again.

The whole curing time is not less than 28 days.

The density of the material after wheel milling is less than 1200Kg/m³. The first molding pressure is controlled to be 11Mpa, the exciting force of a brick making machine is 58kN, and the amplitude is 2 mm; the second molding pressure is controlled at 12Mpa, the exciting force of the brick making machine is 58kN, and the amplitude is 1 mm; the third molding pressure is controlled at 115Mpa, the exciting force of the brick making machine is 58kN, and the amplitude is 1 mm; the dwell time for each molding was 40S.

After the wheel milling is finished, the water content of the material is 8%.

And (3) detection results:

Example 6. A method for preparing baking-free bricks by using building waste is characterized in that the building waste baking-free bricks are prepared by pressing building waste, cement, solidified powder after ball milling and large building waste crushed materials as raw materials; wherein the mass ratio of the raw materials is as follows: 5% of cement, 1% of ball-milling curing agent based on the mass of the cement, 20% of large building garbage crushed objects and the balance of building residue soil; the large building garbage is one or more of building waste bricks, building waste tiles and building waste concrete blocks, and the diameter of the large building garbage is not less than 10 mm; the building muck comprises soil for grooving construction and chips except large building wastes removed in removal construction, and the diameter of the building muck is not more than 10 mm.

The solidified powder after ball milling comprises the following components in percentage by weight: 6 percent of powdery sodium silicate, 1 percent of dioctyl sodium sulfosuccinate, 1.3 percent of lignosulfonate, 4 percent of polyacrylamide, 15 percent of light-burned magnesia, 8 percent of quicklime, 8 percent of fly ash and the balance of calcined waste mortar.

The preparation method comprises the following steps:

step 1 Material preparation

Step 2: preparation of ball-milling curing agent

Calcining waste mortar at 900 ℃ to prepare calcined waste mortar, putting the curing agent raw material into a ball mill for ball milling, and grinding to obtain the waste mortar with the specific surface area of 550m²/kg。

And step 3: mixing material

And 4, step 4: wheel mill

And 5: building block forming

And 6, maintaining.

In the step 1, the construction residual soil is crushed and then sieved again.

The whole curing time is not less than 28 days.

In step 6, the density of the material after wheel milling is more than 1200Kg/m³. The first molding pressure is controlled at 18.5Mpa, the exciting force of a brick making machine is 58kN, the amplitude is 1mm, and the vibration frequency is 80 times/min; controlling the second molding pressure at 19.2Mpa, the exciting force of the brick making machine at 58kN, the amplitude at 1mm and the vibration frequency at 0 times/min; controlling the molding pressure of the third time at 20Mpa, controlling the exciting force of the brick making machine to be 58kN, controlling the amplitude to be 2mm and controlling the vibration frequency to be 80 times/min; the dwell time for each molding was 40S.

After the wheel milling is finished, the water content of the material is 8%.

And (3) detection results:

the modulus of elasticity and flexibility are increased due to the increased binding force with the aggregate. Because the continuous capillary flow and capillary water rising channels are blocked, no water permeates and the water absorption rate is low. The produced baking-free brick has high strength, low water absorption, good frost resistance, and can save cementing materials, make the brick beautiful in appearance and have comprehensive performance advantages.

The above-mentioned embodiments are only for understanding the present invention, and are not intended to limit the technical solutions of the present invention, and those skilled in the relevant art can make various changes or modifications, and all equivalent changes or modifications are intended to be included within the scope of the present invention. The present invention is not described in detail, but is known to those skilled in the art.

Claims

1. A method for preparing baking-free bricks by using building residue soil is characterized by comprising the following steps:

the building garbage baking-free brick is formed by pressing raw materials of building residue soil, cement, solidified powder after ball milling and large building garbage crushed objects; wherein the mass ratio of the raw materials is as follows: 5% -10% of cement, 1-2% of ball-milling curing agent by mass of the cement, 20-30% of large building garbage crushed objects and the balance of building residue soil; the large building garbage is one or more of building waste bricks, building waste tiles and building waste concrete blocks, and the diameter of the large building garbage is not less than 10 mm; the building muck comprises soil for grooving construction, chips except large building garbage are removed in the removal construction, and the diameter of the building muck is not more than 10 mm;

the solidified powder after ball milling comprises the following components in percentage by weight: 5-10% of powdery sodium silicate, 1-2% of dioctyl sodium sulfosuccinate, 1.3-3% of lignosulfonate, 3-6% of polyacrylamide, 10-20% of light-burned magnesium oxide, 5-10% of quicklime, 5-8% of fly ash and the balance of calcined waste mortar;

the preparation method comprises the following steps:

step 1 Material preparation

Putting the large building garbage into a crusher to be crushed to obtain a large building garbage crushed object, wherein the particle size of the large building garbage crushed object is not more than 10mm and not less than 5 mm;

building residue soil is crushed, and the particle size of the crushed building residue soil is not more than 2 mm;

step 2: preparation of ball-milling curing agent

Calcining waste mortar at 700-900 ℃ to prepare calcined waste mortar, putting the curing agent raw material into a ball mill for ball milling, and grinding to obtain the waste mortar with the specific surface area of 400m²/kg～600m²/kg；

And step 3: mixing material

Building residue soil, cement, solidified powder after ball milling and large blocks of broken building garbage are mixed uniformly after water is added;

and 4, step 4: wheel mill

Placing the obtained material into an edge runner mill, and milling for 10-14 min;

and 5: building block forming

Putting the material after wheel rolling into a forming machine for high static pressure auxiliary vibration forming to form a green brick; the high static pressure auxiliary vibration molding is carried out by adopting a light, stable and triple double-sided three-time pressing mode; controlling the molding pressure to be 10-20 Mpa;

and 6, maintaining.

2. The method for preparing baking-free bricks by using the building residue soil as claimed in claim 1, wherein the method comprises the following steps: in the step 1, the step of screening again is further included after the large building garbage crushed object is put into the crusher to be crushed.

3. The method for preparing baking-free bricks by using the building residue soil as claimed in claim 1, wherein the method comprises the following steps: in the step 1, the construction residual soil is crushed and then sieved again.

4. The method for preparing baking-free bricks by using the building residue soil as claimed in claim 1, wherein the method comprises the following steps: atomizing and spraying water within 3 days after molding, and directly spraying water 3 days later until the moisturizing and curing are finished, and thoroughly pouring; when the temperature is more than or equal to 20 ℃, the moisture retention and maintenance is less than or equal to 14 days, and when the temperature is less than 20 ℃, the moisture retention and maintenance is less than or equal to 7 days; when the moisture preservation curing humidity is less than 75%, sprinkling water on the surface of the brick pile for curing (once in the morning, in the middle and at night); naturally drying and maintaining the mixture for the rest time.

5. The method for preparing baking-free bricks by using the building residue soil as claimed in claim 4, wherein the method comprises the following steps: the whole curing time is not less than 28 days.

6. The method for preparing baking-free bricks by using the building residue soil as claimed in claim 1, wherein the method comprises the following steps:

in the step 6, when the density of the material after wheel milling is larger than 1200Kg/m3, the first-time molding pressure is controlled to be 18-18.5 Mpa, the exciting force of a brick making machine is 50-58 kN, and the amplitude is 1-2 mm; controlling the second molding pressure to be 18.5-19.2 Mpa, controlling the exciting force of the brick making machine to be 50-58 kN, and controlling the amplitude to be 1-2 mm; controlling the third forming pressure to be 19.2-20 Mpa, wherein the exciting force of the brick making machine is 50-58 kN, and the amplitude is 1-2 mm; the pressure maintaining time for each molding is 30-40S;

when the density of the material after wheel milling is less than 1200Kg/m3, the first molding pressure is controlled to be 10-11 Mpa, the exciting force of a brick making machine is 50-58 kN, and the amplitude is 1-2 mm; controlling the second molding pressure to be 11-12 Mpa, controlling the exciting force of the brick making machine to be 50-58 kN, and controlling the amplitude to be 1-2 mm; controlling the third forming pressure to be 12.5-15 Mpa, controlling the exciting force of the brick making machine to be 50-58 kN, and controlling the amplitude to be 1-2 mm; the pressure maintaining time for each molding is 30-40S.

7. The method for preparing baking-free bricks by using the building residue soil as claimed in claim 1, wherein the method comprises the following steps: in the step 3, the water content of the materials after being uniformly mixed is not more than 10%.