CN110698136B - Clay stratum foundation pit residue soil baking-free brick and preparation method thereof - Google Patents

Clay stratum foundation pit residue soil baking-free brick and preparation method thereof Download PDF

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Publication number
CN110698136B
CN110698136B CN201911021863.6A CN201911021863A CN110698136B CN 110698136 B CN110698136 B CN 110698136B CN 201911021863 A CN201911021863 A CN 201911021863A CN 110698136 B CN110698136 B CN 110698136B
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baking
brick
foundation pit
free
muck
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CN110698136A (en
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王树英
王海波
令凡琳
钟嘉政
阳军生
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Central South University
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Central South University
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses a clay stratum foundation pit residue soil baking-free brick and a manufacturing process thereof. The corresponding manufacturing process comprises the steps of drying foundation pit residue soil, wet mixing of raw materials, crushing of a mixture, press forming of baking-free bricks, pre-curing of the baking-free bricks, stacking of the baking-free bricks and final curing of the baking-free bricks. By adopting the proportion and the process provided by the invention, the production efficiency and the yield of the baking-free brick can be obviously improved, and the strength of the baking-free brick finished product reaches MU10 grade. In addition, the baking-free brick prepared from clay stratum foundation pit muck can consume a large amount of excavation muck, can realize energy conservation and emission reduction, has important significance for environmental protection, and meets the requirements of novel wall material development at the present stage of China and the policy of energy conservation and emission reduction. And economic income can be created for enterprises, and the method is favorable for solving the economic pressure and social pressure brought by the muck treatment of subway construction units.

Description

Clay stratum foundation pit residue soil baking-free brick and preparation method thereof
Technical Field
The invention belongs to the field of foundation pit residue soil treatment, and particularly relates to a clay stratum foundation pit residue soil baking-free brick and a preparation method thereof.
Background
The waste heat of subway construction in 2018 has not been dissipated, and a new turn of climax has come in 2019. In the past year, the built urban rail transit line put into operation in China is 5766.6 kilometers, and in the new year, China plans 29 lines of domestic work and urban rail transit projects together. The method brings convenience to people along with subway construction, and how to treat a large amount of muck generated in the excavation process of the subway foundation pit is also a difficult problem to be solved rapidly.
At present, the dregs discharged in the excavation process of the subway foundation pit are generally transported to a suburb waste residue field by adopting a tank car or a dregs car, and the treatment mode not only causes the waste of resources, but also influences the appearance of the city due to leakage in the transportation process, and even causes serious consequences such as environmental pollution, channel siltation, soil hardening and the like due to improper treatment. Therefore, the method has profound significance in realizing resource recycling of the foundation pit muck of the subway. Not only reduces the environmental pollution and land occupation, but also reduces the construction cost, realizes the sustainable development of resources, and responds to the call of national green construction.
Particularly for clay stratums, foundation pit dregs contain more secondary clay minerals and the like, and the clay baking-free brick can be manufactured by adding a certain consolidation agent, so that the cyclic utilization of resources is realized.
Disclosure of Invention
The invention aims to solve the problem of providing a clay stratum foundation pit residue soil baking-free brick with low preparation cost and high strength and a preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
on the one hand, the invention provides a clay stratum foundation pit residue soil baking-free brick which is characterized in that foundation pit residue soil, cement, slaked lime, medium fine sand and powdery soil curing agent are used as raw materials and are uniformly mixed and pressed for forming.
Further, the mass ratio of each solid raw material is as follows: 2.5 to 4.5 percent of cement, 4 to 8 percent of slaked lime, 20 to 30 percent of medium fine sand, 2 to 4 percent of powdery soil curing agent and the balance of foundation pit muck.
Furthermore, the cement is 42.5-grade ordinary portland cement, the particle size of the medium coarse sand is 0.5-2mm, and the powdery soil curing agent is an organic-inorganic combined curing agent.
Furthermore, the baking-free brick has a water-solid ratio (total mass of water/total mass of solid materials) of 0.1-0.15, and the green brick is good in compression molding effect in the range.
On the other hand, the invention provides a clay stratum foundation pit residue soil baking-free brick manufacturing process, which comprises the following steps:
(1) drying of foundation pit muck
And (3) drying the foundation pit muck by natural airing or mechanical drying, and controlling the water content of the dried foundation pit muck within 20%. When the weather condition allows, drying treatment is carried out in a natural drying mode; and when the weather is not allowed, drying by adopting mechanical drying equipment.
(2) Wet mixing of raw materials
And (3) filling the dried foundation pit muck, medium coarse sand, cement and the like into a wheel mill forced stirrer according to a certain proportion for mixing.
(3) Crushing of mixed material
The mixture after wet mixing is easy to agglomerate and agglomerate, and the compression molding effect is influenced. Therefore, the mixture needs to be broken up by a combined crushing device.
(4) Pressing and forming of baking-free brick
And conveying the treated mixture into a material hopper of a hydraulic brick machine by using a belt conveyor, and performing press molding by using the hydraulic brick machine to obtain the residue soil baking-free brick blank.
(5) Pre-curing of baking-free bricks
And stacking the pressed and formed baking-free brick blanks in a canopy for pre-curing.
(6) Baking-free brick stacking
The initially hardened baking-free bricks were conveyed and stacked in a size of 1m × 1m × 1 m.
(7) Final curing of baking-free brick
And (4) carrying out water spraying maintenance on the piled unfired brick blanks for 3 days, wherein the water spraying frequency is twice per day. And after water spraying maintenance, naturally maintaining and drying for 28 days, and then leaving the factory.
Further, the mechanical drying equipment adopted in the step (1) is a large-scale drum type dryer.
Further, the mixing and stirring time of the raw materials in the step (2) is not less than 2 min.
Further, the composite crushing device adopted in the step (3) is a low-rotating-speed vertical composite crusher.
Further, the brick making equipment adopted in the step (4) is a hydraulic static pressure brick making machine, and the forming pressure is 25-35 MPa.
Further, the pre-curing time in the step (5) is 2 days, and the canopy is a transparent roof.
Principles and advantages
The clay stratum foundation pit residue soil is generally composed of primary minerals and secondary clay minerals, and the secondary clay minerals have high activityCharacterized in that in the clay baking-free brick manufacturing process, active SiO in secondary clay minerals2、Al2O3Etc. can be mixed with cement hydration products Ca (OH)2And slaked lime generates volcanic ash reaction to generate calcium silicate hydrate, calcium aluminate hydrate and the like, thereby achieving the purposes of improving the strength of the baking-free brick and reducing the dosage of cement. On the other hand, because clay self moisture content is higher, and inside hole is comparatively compact, can add certain curing agent and turn into bound water with its inside free water, further improve its intensity to show its water resistance of reinforcing.
According to the method, clay stratum foundation pit residue soil is used as a baking-free brick manufacturing raw material for the first time, the addition amount of cement is properly reduced, and the baking-free brick with excellent performance is prepared through the synergistic effect of the components and the preparation process.
The invention has the beneficial effects that:
the baking-free brick prepared from the clay stratum foundation pit muck can consume a large amount of excavation muck, can realize energy conservation and emission reduction, has important significance for environmental protection, and meets the requirements of novel wall material development at the present stage of China and the policy of energy conservation and emission reduction.
In addition, the baking-free brick prepared from the foundation pit muck has low cost, can create economic income for enterprises, and is favorable for solving the economic pressure and social pressure caused by muck treatment of subway construction units.
Secondly, the production process provided by the invention adopts a wheel-grinding forced stirring device, so that the problems of cohesive residue soil agglomeration, crushing, mixing and stirring can be effectively solved; the static pressure type brick making machine has the advantages of low noise, high forming pressure, low equipment energy consumption and the like; the provided maintenance mode not only can effectively reduce the area of a baking-free brick blank stacking field, but also can obviously improve the strength of the baking-free brick blank; in a word, the process provided by the invention can obviously improve the production efficiency and the yield of the baking-free bricks.
Drawings
FIG. 1 is a diagram of a brick pattern produced in the example;
FIG. 2 is a diagram of a brick pattern produced in the example;
FIG. 3 is a diagram of a brick pattern produced in the example;
FIG. 4 is a diagram of a brick pattern produced in the example;
FIG. 5 is a picture of a brick prepared in the example.
Detailed Description
The technical solutions of the present invention will be described clearly and completely through specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The self physical mechanical property and the mineral component content of the clay stratum foundation pit residue soil have influence on the mixing, press forming and later strength increase of the baking-free bricks, so that the physical mechanical property parameters and the mineral components of the clay stratum foundation pit residue soil need to be analyzed.
The residue soil of a foundation pit at a certain station of a Hangzhou subway line is sampled and detected by a professional detection department, and the uneven coefficient C of the residue soil is foundu15, uneven distribution of particles, coefficient of curvature Cc1.1, the particle size distribution is good, wherein the sand grain accounting for 0.075-2 mm is 18.64%, the coarse particle content is less, the sticky grain accounting for less than 0.005mm is 22.04%, the clay belongs to powdery clay, the cementation property is strong, the stirring property is poor, and great challenges are brought to the manufacture of baking-free bricks. The physical and mechanical properties and mineral components are shown in tables 1 and 2, respectively.
TABLE 1 conditions of physical and mechanical properties of the residue soil
TABLE 2 ratio of mineral components in the residue
Example 1:
the clay stratum foundation pit residue soil baking-free brick is prepared by uniformly mixing the above foundation pit residue soil, cement, slaked lime, medium fine sand and powdery soil curing agent (hydroxyethyl cellulose, etc.) as raw materials, and pressing to form.
The mass ratio of each solid raw material is as follows: 71% of foundation pit residue soil, 3% of cement, 4% of slaked lime, 20% of medium fine sand and 2% of powdery soil curing agent.
A foundation pit muck baking-free brick manufacturing process comprises the following steps:
(1) drying of foundation pit muck
The foundation pit muck is dried by natural airing or mechanical drying, and the moisture content of the dried subway foundation pit muck is controlled within 20%.
(2) Wet mixing of raw materials
And (3) putting the dried foundation pit muck, medium coarse sand, cement and the like into a wheel mill forced stirrer according to a certain proportion, and mixing for 5 min.
(3) Crushing of mixed material
The mixture after wet mixing is easy to agglomerate and agglomerate, and the compression molding effect is influenced. Therefore, the mixture needs to be broken up by a combined crushing device.
(4) Pressing and forming of baking-free brick
And conveying the treated mixture into a material hopper of a hydraulic brick machine by using a belt conveyor, and performing press molding by using the hydraulic brick machine to obtain the residue soil baking-free brick blank, wherein the molding pressure is 25 MPa.
(5) Pre-curing of baking-free bricks
And stacking the pressed and formed baking-free brick blanks in a canopy for pre-curing.
(6) Baking-free brick stacking
The initially hardened baking-free bricks were conveyed and stacked in a size of 1m × 1m × 1 m.
(7) Final curing of baking-free brick
And (4) carrying out water spraying maintenance on the piled unfired brick blanks for 3 days, wherein the water spraying frequency is twice per day. And after water spraying curing, naturally curing and drying for 28 days, and then leaving the factory, wherein the prepared brick sample is shown in figure 1.
Example 2:
different from the embodiment 1, the solid raw materials have the following mass ratio: 65% of foundation pit residue soil, 4% of cement, 4% of slaked lime, 25% of medium fine sand and 2% of powdery soil curing agent, and the prepared brick sample is shown in figure 2.
Example 3:
different from the embodiment 1, the solid raw materials have the following mass ratio: 53.5% of foundation pit residue soil, 4.5% of cement, 8% of slaked lime, 30% of medium fine sand and 4% of powdery soil curing agent.
The raw materials are subjected to wet mixing, the dried foundation pit residue soil, medium coarse sand, cement and the like are loaded into a wheel-milling forced stirrer according to a certain proportion and mixed for 10min, the processed mixture is conveyed into a material hopper of a hydraulic brick machine by a belt conveyor and is subjected to compression molding by the hydraulic brick machine, so that a residue soil baking-free brick blank is prepared, the molding pressure is 30MPa, and the prepared brick sample is shown in figure 3.
Example 4:
different from the embodiment 1, the solid raw materials have the following mass ratio: the brick sample prepared from 75% of foundation pit residue soil, 2% of cement, 2% of slaked lime, 20% of medium fine sand and 1% of powdery soil curing agent is shown in figure 4.
Example 5:
different from the embodiment 1, the solid raw materials have the following mass ratio: the brick sample prepared from 44% of foundation pit residue soil, 4% of cement, 15% of slaked lime, 35% of medium fine sand and 2% of powdery soil curing agent is shown in figure 5.
For the above examples, samples were taken for the compression strength test, and the measurement results were as follows:
from the above table data, it can be seen that the compressive strength of the samples prepared according to the formulation given in the present disclosure reaches the MU10 level for examples 1, 2 and 3. For example 4, when the material ratio is below the given range, the cement hydration cementation effect is lackedThe consolidation effect of the consolidation agent and the pozzolanic reaction, as can be seen from fig. 4, the consolidation property of the concrete after compression molding is weaker, the concrete is easy to break away from corners, and the later strength is obviously reduced; for example 5, when the material ratio is higher than the given range, especially when the content of slaked lime and the content of aggregates are high, only a part of Ca (OH) is contained due to the limited content of secondary clay minerals contained in the clay2When volcanic ash is involved, the cementing property of the redundant slaked lime is weak, and as shown in fig. 5, the brick shape is easy to brittle and weak in cementing property, which is also not beneficial to the increase of the strength of the brick body. In a word, the embodiment shows that the method has high implementability in the clay stratum baking-free brick manufacturing process, and the manufactured baking-free bricks can reach MU10 level.
The baking-free brick prepared from the clay stratum foundation pit muck can consume a large amount of excavation muck, can realize energy conservation and emission reduction, has important significance for environmental protection, and meets the requirements of novel wall material development at the present stage of China and the policy of energy conservation and emission reduction.
In addition, the baking-free brick prepared from the foundation pit muck has low cost, can create economic income for enterprises, and is favorable for solving the economic pressure and social pressure caused by muck treatment of subway construction units.
Secondly, the production process provided by the invention adopts a wheel-grinding forced stirring device, so that the problems of cohesive residue soil agglomeration, crushing, mixing and stirring can be effectively solved; the static pressure type brick making machine has the advantages of low noise, high forming pressure, low equipment energy consumption and the like; the provided maintenance mode not only can effectively reduce the area of a baking-free brick blank stacking field, but also can obviously improve the strength of the baking-free brick blank; in a word, the process provided by the invention can obviously improve the production efficiency and the yield of the baking-free bricks.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (8)

1. A clay stratum foundation pit residue soil baking-free brick preparation method is characterized in that foundation pit residue soil, cement, slaked lime, medium fine sand and powdery soil curing agent are used as raw materials and are uniformly mixed and pressed for forming; wherein the content of the first and second substances,
the mass ratio of the raw materials is as follows: 2.5 to 4.5 percent of cement, 4 to 8 percent of slaked lime, 20 to 30 percent of medium fine sand, 2 to 4 percent of powdery soil curing agent and the balance of foundation pit muck;
the water-solid ratio of the baking-free brick is 0.1-0.15;
the method comprises the following steps:
(1) drying of foundation pit muck
(2) Wet mixing of raw materials
Filling the dried foundation pit muck, medium fine sand, cement and the like into a wheel mill forced stirrer according to a certain proportion for mixing;
(3) crushing of mixed material
Scattering the mixture after wet mixing by a composite crushing device;
(4) pressing and forming of baking-free brick
Conveying the treated mixture into a material hopper of a hydraulic brick machine by a belt conveyor, and performing compression molding by the hydraulic brick machine to obtain a residue soil baking-free brick blank;
(5) pre-curing of baking-free bricks
Pre-curing the press-formed baking-free green brick;
(6) baking-free brick stacking
(7) Final curing of baking-free brick
And (4) carrying out water spraying maintenance on the piled unfired brick blanks, and then naturally maintaining and drying after the water spraying maintenance, thus leaving the factory.
2. The preparation method according to claim 1, wherein the cement is 42.5-grade ordinary portland cement, the medium fine sand has a particle size of 0.075-0.5mm, and the powdery soil solidifying agent is an organic-inorganic combined solidifying agent.
3. The method of claim 1, wherein: in the step (1), when the weather condition allows, drying treatment is carried out in a natural airing way; and when the weather is not allowed, drying by adopting mechanical drying equipment, and controlling the moisture content of the dried foundation pit residue soil within 20%.
4. The production method according to claim 3, characterized in that: the mechanical drying equipment is a large-scale rotary drum type dryer.
5. The method of claim 1, wherein: the mixing and stirring time of the raw materials is not less than 5 min.
6. The method of claim 1, wherein: the composite crushing device is a low-rotating-speed vertical composite crusher.
7. The method of claim 1, wherein: the brick making equipment is a static pressure type hydraulic brick machine, and the forming pressure is 25-35 MPa.
8. The method of claim 1, wherein: the precuring time is 2 days.
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