CN107382248B - Modified raw soil, method for preparing raw soil brick by using modified raw soil and raw soil brick prepared by using modified raw soil - Google Patents
Modified raw soil, method for preparing raw soil brick by using modified raw soil and raw soil brick prepared by using modified raw soil Download PDFInfo
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- CN107382248B CN107382248B CN201710665715.2A CN201710665715A CN107382248B CN 107382248 B CN107382248 B CN 107382248B CN 201710665715 A CN201710665715 A CN 201710665715A CN 107382248 B CN107382248 B CN 107382248B
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/141—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 calcium sulfate cements containing dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
- 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
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses modified raw soil, a method for preparing a raw soil brick by utilizing the modified raw soil and the prepared raw soil brick, and belongs to the technical field of building materials. The soil modifier consists of raw soil and a modifier, wherein the raw soil and the modifier are 75-80% by mass: 20-25%, wherein the modifier comprises the following components in percentage by mass: 24.3 to 27 percent of cement, 43.3 to 48.5 percent of tailing sand, 9.7 to 10.8 percent of tailing powder, 9.7 to 10.8 percent of fly ash and 4.8 to 5.4 percent of phosphogypsum; 2.6 to 2.9 percent of water reducing agent, and basalt short fiber or polypropylene fiber with the volume mixing amount of 0.2 to 0.6 percent can also be added into the modifier. The mechanical property, water resistance, durability and impermeability of the prepared raw soil brick are improved to a great extent, and the prepared raw soil brick can be effectively applied to various buildings and artware or applied to the technical fields of river bank renovation and the like through sandy soil solidification.
Description
Technical Field
The invention relates to modified raw soil, belongs to the technical field of building materials, and particularly relates to modified raw soil, a method for preparing a raw soil brick by utilizing the modified raw soil and the raw soil brick prepared by the method.
Background
The raw soil is natural, healthy, environment-friendly and economical as a building material, is a material with higher cost performance, and is often used by being made into raw soil bricks by tamping or direct forming. The raw soil building based on the raw soil bricks saves energy, is simple and convenient to construct, is warm in winter and cool in summer, is healthy and comfortable, but the raw soil bricks generally have the problems of low strength, poor toughness, poor water resistance, poor durability and the like, and the service life of the raw soil building is seriously influenced.
In addition, at present, a large amount of industrial waste residues occupy the land, the reasonable and practical performance of the land is influenced, and part of the industrial waste residues can cause pollution to the environment to a certain extent.
Disclosure of Invention
In order to solve the technical problems, the invention discloses modified raw soil, a method for preparing a raw soil brick by utilizing the modified raw soil and the raw soil brick prepared by the method on the basis of further improving the compression resistance and the fracture resistance of the raw soil brick.
In order to achieve the purpose, the invention discloses modified raw soil which comprises raw soil and a modifier, wherein the raw soil and the modifier account for 75-80% by mass: 20-25%, wherein the modifier comprises the following components in percentage by mass: 24.3 to 27 percent of cement, 43.3 to 48.5 percent of tailing sand, 9.7 to 10.8 percent of tailing powder, 9.7 to 10.8 percent of fly ash, 4.8 to 5.4 percent of phosphogypsum and 2.6 to 2.9 percent of water reducing agent.
Further, the modifier also comprises basalt short fiber or polypropylene fiber with the volume mixing amount of 0.2-0.6%.
And further, grinding the tailing powder by using tailing sand until the specific surface area is 350-450 m2Powder/kg.
Furthermore, the tailings sand is rich silicon iron tailings sand, and the content of silicon dioxide in the rich silicon iron tailings sand is more than 65%.
Furthermore, the particle size of the tailing sand is 0.30-2.36 mm.
Furthermore, the water reducing agent is a naphthalene water reducing agent, the water reducing rate of the naphthalene water reducing agent is 20-25%, and the water-solid ratio of the whole system is controlled to be 0.11-0.12 by the naphthalene water reducing agent.
Further, the cement is grade 42.5 cement of Huaxin brand common silicate.
Still further, the phosphogypsum is dihydrate gypsum.
The invention also discloses a method for preparing a raw soil brick by using the modified raw soil, which comprises the following steps: uniformly mixing raw soil and a modifier in a corresponding proportion to obtain modified raw soil, putting the modified raw soil into a brick mold, performing compression molding under the pressure of 6-10 Mpa, demolding after 1-3 days, and placing indoors for standard maintenance for 28-40 days to obtain the raw soil brick.
The invention also discloses the raw soil brick prepared by the method for preparing the raw soil brick.
The selection principle of the raw materials of the modified raw soil is as follows:
1. selecting the tailing sand and the tailing powder: the tailing sand and the tailing powder belong to industrial solid wastes, and can ensure good mechanical property and gradation on the basis of meeting the technical indexes in GBT14684/2001 building sand specifications, so that the mechanical property of the prepared raw soil brick is improved; wherein, in the process of preparing the raw soil brick, the tailing sand is used as fine aggregate, plays a role in supporting the fine aggregate, improves the stability and the mechanical property of the raw soil brick, and has the surface area of 350-450 m2The/kg tailing powder not only has good physical filling effect, can well increase the compactness of the raw soil brick, but also has certain activity, can react with cement to generate CSH gel, and further increases the strength of the raw soil brick.
2. Selecting basalt short fibers or polypropylene fibers: the basalt short fiber or the polypropylene fiber has high temperature resistance, oxidation resistance, radiation resistance, heat insulation and diaphragm sound, good filterability, high compressive strength and high shear strength, and is suitable for being used in various environments, wherein the basalt short fiber belongs to a pure natural inorganic metal material with high cost performance, and the basalt short fiber and the pure natural inorganic metal material can solve the technical problems of poor cohesiveness, poor bending resistance and poor impermeability of common raw soil bricks.
Advantageous effects
1. According to the raw soil brick prepared by the invention, the compression resistance and the folding resistance of the raw soil brick can be improved by times by adding the tailing sand and the tailing powder, wherein the addition amount of the tailing powder and the size proportion of the tailing powder have certain influence on the strength and the toughness of the raw soil brick, and within a certain range, the higher the amount of the tailing powder is, the smaller the particle size is, and the better the compression resistance and the folding resistance of the raw soil brick is.
2. The raw soil brick prepared by the invention has greatly improved water resistance on the basis of adding a certain amount of basalt short fibers or polypropylene fibers.
3. The raw soil brick prepared by the invention can be effectively applied to various buildings and artware, or can be applied to the technical fields of river bank renovation and the like through sandy soil solidification.
Detailed Description
In order to better explain the invention, the following further illustrate the main content of the invention in connection with specific examples, but the content of the invention is not limited to the following examples.
Example 1
600g of rich silicon iron tailing sand (preferably, the content of silicon dioxide in the rich silicon iron tailing sand is 65 percent by mass, and the particle diameter of the rich silicon iron tailing sand is 1.5mm), 300g of Huaxinpai ordinary silicate 42.5 grade cement, and 120g of tailing powder (preferably, the specific surface area of the tailing powder is 400 m)2Adding 120g of fly ash and 60g of dihydrate gypsum into 4900g of raw soil, stirring for 2-5 min to obtain a mixture, dissolving 36g of naphthalene water reducer into 600g of water (preferably, the water reduction rate of the naphthalene water reducer is 20%), pouring the mixture into a stirrer containing the mixture, continuously stirring for 2-8 min, controlling the water-solid ratio of the whole system to be 0.11, obtaining modified raw soil, placing the modified raw soil into a mold which is 240mm long, × wide, 50mm wide, × mm high and 115mm high, performing compression molding under the pressure of 8MPa, demolding after 1 day, placing the mold into a room, performing standard maintenance, controlling the indoor temperature to be about 20 ℃ and the relative humidity to be 25%, and obtaining the modified raw soil brick after the standard maintenance reaches a certain age.
Example 2
600g of rich silicon iron tailing sand (preferably, the content of silicon dioxide in the rich silicon iron tailing sand is 65 percent by mass, and the particle diameter of the rich silicon iron tailing sand is 1.5mm), 300g of Huaxinpai ordinary silicate 42.5 grade cement, and 120g of tailing powder (preferably, the specific surface area of the tailing powder is 400 m)2Adding 120g of fly ash and 60g of dihydrate gypsum into 4900g of raw soil, stirring for 2-5 min, dissolving 36g of naphthalene water reducer into 600g of water (preferably, the water reduction rate of the naphthalene water reducer is 20%), pouring into a stirrer, continuously stirring for 2-8 min, uniformly adding 0.2% by volume of basalt short fibers into the stirrer, continuously stirring for 3min, controlling the water-solid ratio of the whole system to be 0.11, obtaining modified raw soil, placing the modified raw soil into a mold with the length of 240mm ×, the width of 50mm × and the height of 115mm, performing compression molding under the pressure of 8MPa, demolding after 1 day, placing in a room for standard maintenance, and controlling the indoor temperature to be about 20 DEG CAnd on the right, the relative humidity is 25 percent, and the modified raw soil brick is obtained after standard curing reaches a certain age.
Example 3
600g of rich silicon iron tailing sand (preferably, the content of silicon dioxide in the rich silicon iron tailing sand is 65 percent by mass, and the particle diameter of the rich silicon iron tailing sand is 1.5mm), 300g of Huaxinpai ordinary silicate 42.5 grade cement, and 120g of tailing powder (preferably, the specific surface area of the tailing powder is 400 m)2Adding 120g of fly ash and 60g of dihydrate gypsum into 4900g of raw soil, stirring for 2-5 min, dissolving 36g of naphthalene water reducer into 600g of water (preferably, the water reduction rate of the naphthalene water reducer is 22%), pouring into a stirrer, continuously stirring for 2-8 min, uniformly adding 0.2% polypropylene fiber into the stirrer, continuously stirring for 3min, controlling the water-solid ratio of the whole system to be 0.11, obtaining modified raw soil, placing the modified raw soil into a mould which is 240mm long, ×, 50mm wide, × mm high and 115mm high, performing compression molding under 8MPa pressure, demolding after 1 day, placing the mould into a room, performing standard maintenance, controlling the indoor temperature to be about 20 ℃, controlling the relative humidity to be 25%, and obtaining the modified raw soil brick after the standard maintenance reaches a certain age.
Example 4
600g of rich silicon iron tailing sand (preferably, the content of silicon dioxide in the rich silicon iron tailing sand is 70 percent by mass, and the particle diameter of the rich silicon iron tailing sand is 0.5mm), 375g of Huaxinpai ordinary silicate 42.5 grade cement, 150g of tailing powder (preferably, the specific surface area of the tailing powder is 350 m)2Adding 150g of fly ash and 75g of dihydrate gypsum into 4200g of raw soil, stirring for 2-5 min, dissolving 36g of naphthalene water reducer into 600g of water (preferably, the water reduction rate of the naphthalene water reducer is 22%), pouring into a stirrer, continuously stirring for 2-8 min, controlling the water-solid ratio of the whole system to be 0.12 to obtain modified raw soil, placing the modified raw soil into a mold which is 240mm long, × mm long, 50mm wide, × mm wide and 115mm high, pressing and molding under the pressure of 8MPa, demolding after 2 days, placing the modified raw soil into a room for standard maintenance, controlling the indoor temperature to be about 20 ℃ and the relative humidity to be 15%, and obtaining the modified raw soil brick after the standard maintenance reaches a certain age.
Example 5
600g of ferrosilicon-rich tailing sand (preferably silicon-rich)The weight percentage content of silicon dioxide in the iron tailing sand is 70 percent, the grain diameter of the rich silicon iron tailing sand is 0.5mm, 375g of Huaxin brand common silicate 42.5 grade cement, 150g of tailing powder (preferably the specific surface area of the tailing powder is 350 m)2Adding 150g of fly ash and 75g of dihydrate gypsum into 4200g of raw soil, stirring for 2-5 min, dissolving 36g of naphthalene water reducing agent into 600g of water (preferably, the water reducing rate of the naphthalene water reducing agent is 22%), pouring the mixture into a stirrer, continuously stirring for 2-8 min, uniformly adding 0.5% by volume of basalt short fibers into the stirrer, continuously stirring for 5min, controlling the water-solid ratio of the whole system to be 0.12, obtaining modified raw soil, placing the modified raw soil into a mold with the length of 240mm ×, the width of 50mm × and the height of 115mm, pressing and molding under the pressure of 8MPa, demolding after 2 days, placing the modified raw soil into a room for standard maintenance, controlling the indoor temperature to be about 20 ℃, controlling the relative humidity to be 15%, and achieving the standard maintenance for a certain period to obtain the modified raw soil brick.
Example 6
600g of rich silicon iron tailing sand (preferably, the content of silicon dioxide in the rich silicon iron tailing sand is 70 percent by mass, and the particle diameter of the rich silicon iron tailing sand is 0.5mm), 375g of Huaxinpai ordinary silicate 42.5 grade cement, 150g of tailing powder (preferably, the specific surface area of the tailing powder is 350 m)2Adding 150g of fly ash and 75g of dihydrate gypsum into 4200g of raw soil, stirring for 2-5 min, dissolving 36g of naphthalene water reducer into 600g of water (preferably, the water reduction rate of the naphthalene water reducer is 22%), pouring into a stirrer, continuously stirring for 2-8 min, uniformly adding 0.5% polypropylene fiber into the stirrer, continuously stirring for 5min, controlling the water-solid ratio of the whole system to be 0.12, obtaining modified raw soil, placing the modified raw soil into a mould which is 240mm long, ×, 50mm wide, × and 115mm high, pressing and molding under 8MPa pressure, demolding after 2 days, placing the mould into a room, performing standard maintenance, controlling the indoor temperature to be about 20 ℃ and the relative humidity to be 15%, and obtaining the modified raw soil brick after the standard maintenance reaches a certain age.
Example 7
670g of ferrosilicon-rich tailing sand (preferably, the content of silicon dioxide in the ferrosilicon-rich tailing sand is 70% by mass, and the particle size of the ferrosilicon-rich tailing sand is 0.5mm), 375g of Huaxinpai ordinary silicate 42.5 grade cement, 150g of fly ash and 75g of dihydrate gypsum are added into 4200g of raw soil and stirred for 2-5 min, then 40g of naphthalene water reducing agent is dissolved into 600g of water (preferably, the water reducing rate of the naphthalene water reducing agent is 22%), then the mixture is poured into a stirrer and continuously stirred for 2-8 min, then polypropylene fibers with the volume of 0.5% are uniformly added into the stirrer and continuously stirred for 5min, the water-solid ratio of the whole system is controlled to be 0.12, modified raw soil is obtained, the modified raw soil is placed into a mold with the length of 240mm, ×, the width of 50mm, the width of × and the height of 115mm, the mold is pressed and molded under the pressure of 8MPa, the mold is demolded after 2 days, the mold is placed indoors for standard curing, the modified raw brick is obtained, the indoor temperature is controlled to be about 20 ℃, and.
Example 8
670g of rich silicon iron tailing sand (preferably, the content of silicon dioxide in the rich silicon iron tailing sand is 70 percent by mass, and the particle diameter of the rich silicon iron tailing sand is 0.5mm), 375g of Huaxinpai ordinary silicate 42.5 grade cement, 80g of tailing powder (preferably, the specific surface area of the tailing powder is 400 m)2Adding 150g of fly ash and 75g of dihydrate gypsum into 4200g of raw soil, stirring for 2-5 min, dissolving 40g of naphthalene water reducer into 600g of water (preferably, the water reduction rate of the naphthalene water reducer is 22%), pouring into a stirrer, continuously stirring for 2-8 min, uniformly adding 0.5% polypropylene fiber into the stirrer, continuously stirring for 5min, controlling the water-solid ratio of the whole system to be 0.12, obtaining modified raw soil, placing the modified raw soil into a mould which is 240mm long, ×, 50mm wide, × and 115mm high, pressing and molding under 8MPa pressure, demolding after 2 days, placing the mould into a room, performing standard maintenance, controlling the indoor temperature to be about 20 ℃ and the relative humidity to be 15%, and obtaining the modified raw soil brick after the standard maintenance reaches a certain age.
Example 9
670g of rich silicon iron tailing sand (preferably, the content of silicon dioxide in the rich silicon iron tailing sand is 70 percent by mass, and the particle diameter of the rich silicon iron tailing sand is 0.5mm), 375g of Huaxinpai ordinary silicate 42.5 grade cement, 80g of tailing powder (preferably, the specific surface area of the tailing powder is 350 m)2Adding 150g of fly ash and 75g of dihydrate gypsum into 4200g of raw soil, stirring for 2-5 min, and addingDissolving 40g of naphthalene water reducer into 600g of water (preferably, the water reducing rate of the naphthalene water reducer is 22%), pouring the mixture into a stirrer to be continuously stirred for 2-8 min, uniformly putting polypropylene fibers with the volume mixing amount of 0.5% into the stirrer to be continuously stirred for 5min, controlling the water-solid ratio of the whole system to be 0.12, obtaining modified raw soil, putting the modified raw soil into a mold with the length of 240mm, ×, the width of 50mm, × and the height of 115mm, performing compression molding under the pressure of 8MPa, demolding after 2 days, putting the mold into a room to perform standard maintenance, controlling the indoor temperature to be about 20 ℃ and the relative humidity to be 15%, and obtaining the modified raw soil brick after the standard maintenance reaches a certain age.
Example 10
670g of rich silicon iron tailing sand (preferably, the content of silicon dioxide in the rich silicon iron tailing sand is 70 percent by mass, and the particle diameter of the rich silicon iron tailing sand is 0.5mm), 375g of Huaxinpai ordinary silicate 42.5 grade cement, 120g of tailing powder (preferably, the specific surface area of the tailing powder is 350 m)2Adding 150g of fly ash and 75g of dihydrate gypsum into 4200g of raw soil, stirring for 2-5 min, dissolving 40g of naphthalene water reducer into 600g of water (preferably, the water reduction rate of the naphthalene water reducer is 22%), pouring into a stirrer, continuously stirring for 2-8 min, uniformly adding 0.5% polypropylene fiber into the stirrer, continuously stirring for 5min, controlling the water-solid ratio of the whole system to be 0.12, obtaining modified raw soil, placing the modified raw soil into a mould which is 240mm long, ×, 50mm wide, × and 115mm high, pressing and molding under 8MPa pressure, demolding after 2 days, placing the mould into a room, performing standard maintenance, controlling the indoor temperature to be about 20 ℃ and the relative humidity to be 15%, and obtaining the modified raw soil brick after the standard maintenance reaches a certain age.
Comparative example 1:
adding 750g of river sand, 375g of Huaxin brand common silicate 42.5 grade cement, 150g of fly ash and 75g of dihydrate gypsum into 1650g of raw soil, stirring for 2min, dissolving 36g of naphthalene water reducing agent into 600g of water (preferably, the water reducing rate of the naphthalene water reducing agent is 22%), then pouring into a stirrer, continuously stirring for 2min, controlling the water-solid ratio of the whole system to be 0.11, obtaining modified raw soil, placing the modified raw soil into a mold which is 240mm long, × wide, 50mm wide, × mm wide and 115mm high, performing compression molding under the pressure of 8MPa, demolding after 2 days, placing the mold into a room for standard maintenance, controlling the indoor temperature to be about 20 ℃, controlling the relative humidity to be 15%, and obtaining the modified raw soil brick after the standard maintenance reaches a certain age.
Further preferably, the river sand of the comparative example 1 is river sand around the Yangtze river;
the raw soil bricks prepared in the above examples and comparative examples were subjected to tests of compressive strength, flexural strength, water resistance and impermeability, respectively, and table 1 was obtained as follows:
TABLE 1 Performance test Table (I) for raw bricks of examples and comparative examples
Examples 1 to 3 and 4 to 6 are for comparing the influence of the addition of polypropylene fibers or basalt short fibers on the performance of the tile, and it is understood from the data in table 1 that when the same proportion of the tailings powder and the tailings sand with the same particle size are added, the addition of polypropylene fibers or basalt short fibers has a greater influence on the durability and water resistance of the tile, and the water resistance of the tile with basalt short fibers is slightly stronger than that of the tile with polypropylene fibers; in addition, compared with the raw soil brick prepared from the common river sand in the comparative example 1 and the common raw soil brick without any curing agent, the raw soil brick prepared by the invention has multiplied improvement on the performances such as average compressive strength, average breaking strength and the like.
In examples 7 to 10, the influence of the addition ratio and the particle size of the tailings powder on the performance of the raw soil brick is compared, and it is understood from table 1 that the larger the addition amount of the tailings powder is, the smaller the particle size is, and the better the average compressive strength and the average flexural strength of the raw soil brick are.
The raw bricks prepared in the above examples 1 to 6 were subjected to standard curing for 7 days, immersed in water for 3 days, and tested for average compressive strength and permeability coefficient to obtain table 2:
TABLE 2 Performance test Table (II) of the raw brick of the example
| Average compressive Strength (MPa) | Average density (kg/m)3) | Coefficient of Permeability (cm/s) | |
| Example 1 | 12.7 | 1800 | 0.202×10-11 |
| Example 2 | 15.8 | 1850 | 0.189×10-11 |
| Example 3 | 14.2 | 1823 | 0.165×10-11 |
| Example 4 | 14.2 | 1820 | 0.200×10-11 |
| Example 5 | 15.6 | 1845 | 0.175×10-11 |
| Example 6 | 14.9 | 1838 | 0.160×10-11 |
As can be seen from Table 2, the modified raw soil brick still has a compressive strength of 12.7-15.8 MPa and a density of 1800kg/m after being soaked in water for 3 days3Therefore, the raw soil brick prepared by the invention makes up the technical problem of poor durability of the existing raw soil brick; it can be known from table 2 that the impermeability of the brick is slightly stronger than that of the brick containing basalt short fiber.
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention. In addition to the above embodiments, the present invention has other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. The modified raw soil for preparing the raw soil brick comprises raw soil and a modifier, wherein the raw soil and the modifier account for 75-80% by mass: 20-25%, its characterized in that: the modifier comprises the following components in percentage by mass: 24.3-27% of cement, 43.3-48.5% of tailing sand, 9.7-10.8% of tailing powder, 9.7-10.8% of fly ash, 4.8-5.4% of phosphogypsum and 2.6-2.9% of a water reducing agent;
the modifier also comprises basalt short fiber or polypropylene fiber with the volume mixing amount of 0.2-0.6%;
the tailing powder is ground by using tailing sand until the specific surface area is 350-450 m2Powder/kg; the particle size of the tailing sand is 0.30-2.36 mm.
2. The modified raw soil for making a raw soil brick according to claim 1, wherein: the tailing sand is rich-silicon iron tailing sand, and the mass percent content of silicon dioxide in the rich-silicon iron tailing sand is more than 65%.
3. The modified raw soil for use in the preparation of raw soil bricks according to claim 1 or 2, wherein: the water reducing agent is a naphthalene water reducing agent, the water reducing rate of the naphthalene water reducing agent is 20-25%, and the water-solid ratio of the whole system is controlled to be 0.11-0.12 by the naphthalene water reducing agent.
4. The modified raw soil for use in the preparation of raw soil bricks according to claim 1 or 2, wherein: the cement is ordinary Portland 42.5 grade cement.
5. The modified raw soil for use in the preparation of raw soil bricks according to claim 1 or 2, wherein: the phosphogypsum is dihydrate gypsum.
6. The method for preparing a raw soil brick by using the modified raw soil of any one of claims 1 to 5, wherein: the preparation process comprises the following steps: uniformly mixing raw soil and a modifier in a corresponding proportion to obtain modified raw soil, putting the modified raw soil into a brick mold, performing compression molding under the pressure of 6-10 Mpa, demolding after 1-3 days, and placing indoors for standard maintenance for 28-40 days to obtain the raw soil brick.
7. A raw soil brick produced according to the method of producing a raw soil brick of claim 6.
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| CN107382248B true CN107382248B (en) | 2020-08-04 |
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| CN108585629A (en) * | 2018-05-17 | 2018-09-28 | 土上（北京）建筑设计咨询有限公司 | The production method and craftwork of craftwork |
| CN108929092A (en) * | 2018-07-26 | 2018-12-04 | 合肥伊只门窗有限公司 | A kind of oil resistant freeze thawing resistance anti-fire door core board |
| CN108929093A (en) * | 2018-07-26 | 2018-12-04 | 合肥伊只门窗有限公司 | A kind of preparation method of ardealite anti-fire door core board |
| CN108911667A (en) * | 2018-07-26 | 2018-11-30 | 合肥伊只门窗有限公司 | A kind of door panel of water-proof fire-retardant containing pyrophillite |
| CN108863210A (en) * | 2018-07-26 | 2018-11-23 | 合肥伊只门窗有限公司 | A kind of composite foamed anti-fire door core board and its application |
| CN108751899A (en) * | 2018-07-26 | 2018-11-06 | 合肥伊只门窗有限公司 | A kind of novel environment friendly anti-fire door core board |
| CN113135724A (en) * | 2021-04-19 | 2021-07-20 | 扬州邗江中科南工建设工程与信息化研究中心 | Negative carbon emission modified raw soil base building block and manufacturing method thereof |
| CN116553878A (en) * | 2023-02-22 | 2023-08-08 | 西安石油大学 | Modified raw soil material formula utilizing cement and iron tailings |
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| CN104326724A (en) * | 2014-10-17 | 2015-02-04 | 天津城建大学 | Novel raw-soil baking-free brick and preparation method thereof |
| CN104844090B (en) * | 2015-05-05 | 2018-01-12 | 中国建筑材料科学研究总院 | A kind of raw-soil suitable for raw-soil building block is plastered binding material and preparation method thereof |
| CN105236871B (en) * | 2015-05-19 | 2018-04-10 | 青海省建筑建材科学研究院有限责任公司 | A kind of green cob brick and preparation method thereof |
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