CN107324716B - Natural stone imitated stain-resistant water permeable brick and preparation method thereof - Google Patents
Natural stone imitated stain-resistant water permeable brick and preparation method thereof Download PDFInfo
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- CN107324716B CN107324716B CN201710437937.9A CN201710437937A CN107324716B CN 107324716 B CN107324716 B CN 107324716B CN 201710437937 A CN201710437937 A CN 201710437937A CN 107324716 B CN107324716 B CN 107324716B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
- E01C5/065—Pavings made of prefabricated single units made of units with cement or like binders characterised by their structure or component materials, e.g. concrete layers of different structure, special additives
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a natural stone imitated stain-resistant water permeable brick and a preparation method thereof, the stain-resistant water permeable brick comprises a stain-resistant water permeable surface layer and a water permeable base layer, wherein the stain-resistant water permeable surface layer is prepared from the following raw materials in parts by mass: 10-15 parts of cement, 0.5-2 parts of water-based binder, 65-75 parts of modified fine aggregate, 2-4.5 parts of water, 1.5-2 parts of water penetrating agent and 3-8 parts of pigment; the permeable base layer is prepared from the following raw materials in parts by mass: 15-25 parts of fly ash, 5-10 parts of cement, 10-20 parts of carbide slag, 5-15 parts of furnace slag, 15-20 parts of construction waste, 2-4 parts of a water penetrating agent and 3-8 parts of water. The mass ratio of the stain-resistant permeable surface layer to the permeable base layer is 1:7.5-8.5, and the modified fine aggregate is obtained by modifying one or more fine aggregates of granite chips, marble chips, quartz sand and silica sand. The water permeable brick has the advantages of high pollution resistance level, wear resistance, good water permeability, high strength, low cost, smooth surface, stone imitation, attractive appearance and the like.
Description
Technical Field
The invention relates to a natural stone imitated stain-resistant water permeable brick and a preparation method thereof, belonging to the field of building materials.
Background
As an important ring in a sponge city construction system, the pavement permeable brick plays a great role. In the construction flood tide of sponge cities, the market prospect is extremely wide. The water permeable brick has the following advantages: the water-permeable and air-permeable floor has good water permeability and air permeability, can enable rainwater to rapidly permeate into the ground, replenishes soil water and underground water, keeps soil humidity, and improves survival conditions of urban ground plants and soil microorganisms; the water and heat can be absorbed, the temperature and the humidity of local space of the earth surface are adjusted, and the urban microclimate can be adjusted and the urban heat island effect can be relieved; the pressure of urban drainage and flood control can be reduced, and the method has good effects on preventing pollution of public water areas and treating sewage; the rain-proof snow sweeper does not accumulate water after rain and does not skid after snow, and is convenient for going out; the surface is tiny unsmooth, prevents the road surface reflection of light, absorbs the noise that the vehicle produced when driving, can improve the current travelling comfort and the security of vehicle.
At present, most of the water permeable bricks in China generally take natural macadam, building rubbish, slag waste and the like as main resources. In order to obtain better water permeability of the water permeable brick, the particle size of the used particles cannot be too large, but if the particle size of the particles is smaller, the strength of the prepared water permeable brick is not enough, and the water permeability and the strength cannot be obtained at the same time. Moreover, the section of the waste concrete particles is rough, and even if the permeable brick prepared by the waste concrete particles with small particle size is adopted, the water permeability is not good. The change is not big in the first year, but in rainy and snowy weather, especially when meeting muddy water, because the mud in the muddy water can block the inside gap of water permeable brick, greatly reduced water permeability. The water permeability is reduced by 50% in 2 to 3 years. And the surface layer of the current common permeable brick is rough, monotonous and poor in aesthetic degree. Therefore, it is necessary to develop a water permeable brick with better water permeability and more beautiful and practical appearance.
Although natural stone is used for paving squares or streets, and is firm and durable, along with the increasing development of society, the national mine resource exploitation supervision is increased and the stone resource is more and more tense, so that the use cost of the natural stone is higher and higher, and the adoption of the natural stone for municipal consumption in most cities is unrealistic. The research of the permeable stone-like brick overcomes the defects, reduces the waste of natural resources and greatly reduces the cost. Therefore, it is necessary to develop a water permeable brick with good water permeability similar to natural stone.
Disclosure of Invention
The invention aims to solve the problems that the conventional common water permeable brick is easily blocked by sludge water and the like, has poor wear resistance, poor water permeable effect, insufficient aesthetic degree and the like, and provides a natural stone imitated stain-resistant water permeable brick and a preparation method thereof. The water permeable brick has the advantages of high pollution resistance level, wear resistance, good water permeability, high strength, low cost, smooth surface, stone imitation, attractive appearance and the like.
In order to achieve the purpose, the invention adopts the technical scheme that the natural stone imitated stain-resistant water permeable brick comprises a stain-resistant water permeable surface layer and a water permeable base layer, wherein the stain-resistant water permeable surface layer is prepared from the following raw materials in parts by mass: 10-15 parts of cement, 0.5-2 parts of water-based binder, 65-75 parts of modified fine aggregate, 2-4.5 parts of water, 1.5-2 parts of water penetrating agent and 3-8 parts of pigment; the permeable base layer is prepared from the following raw materials in parts by mass: 15-25 parts of fly ash, 5-10 parts of cement, 10-20 parts of carbide slag, 5-15 parts of furnace slag, 15-20 parts of construction waste, 2-4 parts of a water penetrating agent and 3-8 parts of water.
The mass ratio of the stain-resistant permeable surface layer to the permeable base layer is 1:7.5-8.5, preferably 1: 8.
The modified fine aggregate is obtained by modifying fine aggregate; the fine aggregate is one or more of granite chips, marble chips, quartz sand and silica sand, and the particle size is 40-80 meshes.
The modified fine aggregate comprises the following components in percentage by weight: aqueous binder: fine aggregate 1: 5: 800, the mixing amount of the antioxidant is 0.1 to 0.5 percent of the water-based binder.
The preparation method of the modified fine aggregate comprises the following steps: putting the fine aggregate into a stirrer, adding a small amount (about 30%) of aqueous binder, stirring, gradually adding the rest of aqueous binder and antioxidant, stirring uniformly, finally adding the coagulant, and continuously stirring for 5-10 minutes to obtain the modified fine aggregate.
The water-based adhesive is SBT-SP103E water-based epoxy resin.
The preparation process comprises the following steps:
(1) preparation of modified Fine aggregate
Putting the fine aggregate into a stirrer, adding a small amount (about 30%) of aqueous binder, stirring, gradually adding the rest of aqueous binder and antioxidant, uniformly stirring, adding the coagulant, and continuously stirring for 5-10 minutes to obtain the modified fine aggregate.
(2) Preparing materials for the stain-resistant water-permeable surface layer: firstly, mixing and stirring cement, modified fine aggregate and pigment uniformly, then adding water, a water-based binder and a water penetrating agent, and stirring uniformly by using a stirrer for later use;
(3) preparing materials for the permeable base layer: firstly, uniformly stirring and mixing the fly ash, the cement, the carbide slag, the furnace slag and the construction waste, then adding water and a water-permeable agent, and uniformly stirring by using a stirrer for later use;
(4) molding: and (4) feeding the materials obtained in the step (2) and the step (3) into a fabric distributor to start material distribution, and carrying out die pressing and vibrating formation.
(5) And (5) feeding the formed permeable green bricks into a curing kiln for curing.
The raw materials and indexes are as follows:
cement: portland cement or ordinary Portland cement with a cement strength grade of 42.5 or above.
Pigment: the pigment is inorganic pigment, powder, iron oxide red, yellow, blue, green, black, etc.
Fly ash: meets GBT 1596-2005 for fly ash in cement and concrete.
Carbide slag: the water content of the waste residue which is obtained by hydrolyzing the calcium carbide and takes calcium hydroxide as a main component after acetylene gas is obtained is 8-12%. The trace elements in the carbide mud do not exceed the discharge standard, and the radioactivity meets the technical requirements of main materials of buildings.
Slag: meets GBT 18046-2008 for granulated blast furnace slag powder used in cement and concrete.
Building garbage: and preparing aggregates with the particle size of 3-5mm from the waste bricks and the waste concrete blocks by a crusher.
Water permeability agent: the type of the water penetrating agent produced by Beijing Dechang Wei building engineering technology Limited company is as follows: the DC-C3 has the advantages of high strength, large bonding force, small addition amount, small cement consumption, low cost and the like. The workability of the permeable layer can be improved by adopting the permeable brick, the water permeability is enhanced, and the durability and the later strength of the permeable brick are improved.
The water permeable brick of the invention has the following technical indexes:
strength class CC50, the length of a grinding pit is 30mm, and the water permeability coefficient (15 ℃) is more than 7.5 multiplied by 10-2cm/s; after the freeze-thaw cycle test, the appearance quality has no front sticky skin and defect, no edge and corner loss, no crack, color difference, layering and the like, and the strength loss is lower than 14 percent. Use ofThe water permeability is reduced by about 3-5% after 3 years.
The water permeable brick has the following beneficial effects:
(1) water permeability with long time effect
The water permeable brick permeates water by destroying the surface tension of water, and the surface is very compact, so the water permeable brick is not easy to be blocked by dust and has long-term water permeability.
(2) Has high strength and good appearance
The fine aggregate is modified by the water-based adhesive, so that the interface strength of the cement and the fine aggregate is improved, and the surface layer strength of the permeable brick is enhanced. Therefore, the water permeable brick has bright and clean appearance similar to natural stone, and has extremely high strength and wear resistance.
(3) The surface layer is pollution-free and is not easy to block
After the fine aggregate is modified, the surface of the brick is smooth, and pits or bulges cannot be formed on the surface of the brick, so that the surface of the brick is easy to clean, and the capillary pores cannot be blocked by impurities. Can achieve the functions of rainwater storage, water retention and purification treatment. The stain resistance grade of the sample brick is evaluated to be 0 grade through GB/T9780-2013, and the surface layer is free of pollution.
The stain resistance of the permeable brick surface layer mainly depends on the density and the amount of surface defects (pinholes, cracks, pits and the like), and the higher the density, the fewer the surface defects and the better the stain resistance. The original water permeable brick has the defects that the surface is rough and the defects are more, and more air holes are formed in the interior of particles, which is the root cause of poor stain resistance and difficulty in cleaning. In the invention, the fine aggregate of natural material is adopted, and the surface with smooth and high density is obtained after modification, so that the soil resistance is good and the cleaning performance is easy.
(4) The raw materials are rich in source, the preparation process is simple and easy to control, and the method is suitable for large-scale production and has wide market prospect.
Detailed Description
The technical solutions and the technical effects thereof are further described below with reference to specific methods, and the following description is only for explaining the present invention but not to limit the present invention in any way, and any modifications or substitutions based on the teaching of the present invention are within the protection scope of the present invention. The methods of the present invention are conventional in the art unless otherwise specified. The reagents used are commercially available, unless otherwise specified.
Example 1
The natural stone imitated stain-resistant water permeable brick comprises a stain-resistant water permeable surface layer and a water permeable base layer, wherein the stain-resistant water permeable surface layer is prepared from the following raw materials in parts by mass: 12 parts of cement, 1 part of water-based binder, 70 parts of modified fine aggregate, 3 parts of water, 1.5 parts of water penetrating agent and 5 parts of pigment; the permeable base layer is prepared from the following raw materials in parts by mass: 20 parts of fly ash, 8 parts of cement, 15 parts of carbide slag, 10 parts of furnace slag, 17 parts of construction waste, 3 parts of a water penetrating agent and 5 parts of water.
The proportion of the stain-resistant permeable surface layer to the permeable base layer is 1: 8.
The preparation process comprises the following steps:
(1) preparation of modified Fine aggregate
According to the coagulant: aqueous binder: fine aggregate 1: 5: 800. adding fine aggregate (granite fragments with the grain diameter of 40-80 meshes) into a stirrer, then adding a small amount (30%) of the aqueous binder for stirring, gradually adding the rest of the aqueous binder and the antioxidant, uniformly stirring, finally adding the coagulant and continuously stirring for 5-10 minutes to obtain the modified fine aggregate.
(2) Preparing materials for the stain-resistant water-permeable surface layer: firstly, mixing and stirring the cement, the modified fine aggregate prepared in the step (1) and the pigment uniformly, then adding the water, the water-based binder and the water penetrating agent, and stirring uniformly by using a stirrer for later use.
(3) Preparing materials for the permeable base layer: firstly, uniformly stirring and mixing the fly ash, the cement, the carbide slag, the furnace slag and the construction waste, then adding water and the water-permeable agent, and uniformly stirring by using a stirrer for later use.
(4) Molding: and (4) feeding the materials obtained in the step (2) and the step (3) into a fabric distributor to start material distribution, and carrying out die pressing and vibrating formation.
(5) And (5) feeding the formed permeable green bricks into a curing kiln for curing.
The prepared water permeable brick has the following performance indexes: the compressive strength is 55.0Mpa, the length of a grinding pit is 29mm, and the water permeability coefficient (15 ℃) is 7.5 multiplied by 10-2cm/s; after the freeze-thaw cycle test, the appearance quality has no front sticky skin and defect, no edge and corner loss, no crack, color difference, layering and the like, and the strength loss is 14%. After the water permeable brick is used for 3 years, the water permeability coefficient (15 ℃) is 7.1 multiplied by 10- 2cm/s, and the stain resistance rating is 0.
Example 2
The natural stone imitated stain-resistant water permeable brick comprises a stain-resistant water permeable surface layer and a water permeable base layer, wherein the stain-resistant water permeable surface layer is prepared from the following raw materials in parts by mass: 10 parts of cement, 0.8 part of water-based binder, 65 parts of modified fine aggregate, 2.5 parts of water, 1.5 parts of water penetrating agent and 5 parts of pigment; the permeable base layer is prepared from the following raw materials in parts by mass: 15 parts of fly ash, 5 parts of cement, 15 parts of carbide slag, 15 parts of furnace slag, 20 parts of construction waste, 3 parts of a water penetrating agent and 5 parts of water.
The proportion of the stain-resistant permeable surface layer to the permeable base layer is 1: 8.
The preparation process comprises the following steps:
(1) preparation of modified Fine aggregate
According to the coagulant: aqueous binder: fine aggregate 1: 5: 800. the mixing amount of the antioxidant is 0.4 percent of the water-based binder, fine aggregate (marble chips, the grain diameter is 40-80 meshes) is put into a stirrer, then a small amount (29 percent) of the water-based binder is added for stirring, the rest water-based binder and the antioxidant are gradually added for uniform stirring, finally the coagulant is added for continuous stirring for 5-10 minutes, and the modified fine aggregate is obtained.
(2) Preparing materials for the stain-resistant water-permeable surface layer: firstly, mixing and stirring the cement, the modified fine aggregate prepared in the step (1) and the pigment uniformly, then adding the water, the water-based binder and the water penetrating agent, and stirring uniformly by using a stirrer for later use.
(3) Preparing materials for the permeable base layer: firstly, uniformly stirring and mixing the fly ash, the cement, the carbide slag, the furnace slag and the construction waste, then adding water and the water-permeable agent, and uniformly stirring by using a stirrer for later use.
(4) Molding: and (4) feeding the materials obtained in the step (2) and the step (3) into a fabric distributor to start material distribution, and carrying out die pressing and vibrating formation.
(5) And (5) feeding the formed permeable green bricks into a curing kiln for curing.
The prepared water permeable brick has the following performance indexes: the compressive strength is 53.0Mpa, the length of the grinding pit is 31mm, and the water permeability coefficient (15 ℃) is 8.0 multiplied by 10-2cm/s; after the freeze-thaw cycle test, the appearance quality has no front sticky skin and defect, no edge and corner loss, no crack, color difference, layering and the like, and the strength loss is 13%. After the water permeable brick is used for 3 years, the water permeability coefficient (15 ℃) is 7.6 multiplied by 10- 2cm/s, and the stain resistance rating is 0.
Example 3
The natural stone imitated stain-resistant water permeable brick comprises a stain-resistant water permeable surface layer and a water permeable base layer, wherein the stain-resistant water permeable surface layer is prepared from the following raw materials in parts by mass: 15 parts of cement, 1.5 parts of water-based binder, 70 parts of modified fine aggregate, 3.5 parts of water, 2 parts of water penetrating agent and 5 parts of pigment; the permeable base layer is prepared from the following raw materials in parts by mass: 25 parts of fly ash, 5 parts of cement, 10 parts of carbide slag, 10 parts of furnace slag, 15 parts of construction waste, 3 parts of a water penetrating agent and 5 parts of water.
The proportion of the stain-resistant permeable surface layer to the permeable base layer is 1: 8.
The preparation process comprises the following steps:
(1) preparation of modified Fine aggregate
According to the coagulant: aqueous binder: fine aggregate 1: 5: 800. the mixing amount of the antioxidant is 0.5 percent of the water-based binder, fine aggregate (granite chips and marble chips are equal, the grain diameter is 40-80 meshes) is put into a stirrer, then a small amount (32 percent) of the water-based binder is added for stirring, the rest of the water-based binder and the antioxidant are gradually added for uniform stirring, finally the coagulant is added for continuously stirring for 5-10 minutes, and the modified fine aggregate is obtained.
(2) Preparing materials for the stain-resistant water-permeable surface layer: firstly, mixing and stirring the cement, the modified fine aggregate prepared in the step (1) and the pigment uniformly, then adding the water, the water-based binder and the water penetrating agent, and stirring uniformly by using a stirrer for later use.
(3) Preparing materials for the permeable base layer: firstly, uniformly stirring and mixing the fly ash, the cement, the carbide slag, the furnace slag and the construction waste, then adding water and the water-permeable agent, and uniformly stirring by using a stirrer for later use.
(4) Molding: and (4) feeding the materials obtained in the step (2) and the step (3) into a fabric distributor to start material distribution, and carrying out die pressing and vibrating formation.
(5) And (5) feeding the formed permeable green bricks into a curing kiln for curing.
The prepared water permeable brick has the following performance indexes: the compressive strength is 56.5Mpa, the length of a grinding pit is 27mm, and the water permeability coefficient (15 ℃) is 7.7 multiplied by 10-2cm/s; after the freeze-thaw cycle test, the appearance quality has no front sticky skin and defect, no edge and corner loss, no crack, color difference, layering and the like, and the strength loss is 14%. After the water permeable brick is used for 3 years, the water permeability coefficient (15 ℃) is 7.4 multiplied by 10- 2cm/s, and the stain resistance rating is 0.
Comparative example 1
The natural stone-like water permeable brick was prepared according to the method of example 1, except that the fine aggregate was used directly without modification after pulverization.
The water permeable brick prepared in comparative example 1 has the following performance indexes: the compressive strength is 46.3Mpa, the length of a grinding pit is 33mm, and the water permeability coefficient (15 ℃) is 6.6 multiplied by 10-2cm/s; after the freeze-thaw cycle test, the appearance quality has no front sticky skin and defect, no edge and corner loss, no crack, color difference, layering and the like, and the strength loss is 16%. After the water permeable brick is used for 3 years, the water permeability coefficient (15 ℃) is 3.0 multiplied by 10-2cm/s, and the stain resistance rating is 2.
The water permeable brick prepared in the example 1 has the following performance indexes: the compressive strength is 55.0Mpa, the length of a grinding pit is 29mm, and the water permeability coefficient (15 ℃) is 7.5 multiplied by 10-2cm/s; after the freeze-thaw cycle test, the appearance quality has no front sticky skin and defect, no edge and corner loss, no crack, color difference, layering and the like, and the strength loss is 14%. After the water permeable brick is used for 3 years, the water permeability coefficient (15 ℃) is 7.1 multiplied by 10-2cm/s, and the stain resistance rating is 0.
As can be seen by comparison, the fine aggregates are modified in the example 1, so that the bonding strength between the fine aggregates is greatly improved, and the prepared water permeable brick has high wear resistance and stain resistance, so that the retention rate of the water permeability coefficient of the example 1 is far higher than that of the comparative example 1 after 3 years of use.
Comparative example 2
A natural stone-like water permeable brick was prepared by the method of example 1, except that the aqueous binder of the modified fine aggregate was replaced with a non-aqueous binder of the same quality to prepare a reference natural stone-like water permeable brick.
The water permeable brick prepared in comparative example 2 has the following performance indexes: compressive strength of 47.5Mpa, grinding pit length of 32mm, and water permeability coefficient (15 deg.C) of 6.7 × 10-2cm/s; after the freeze-thaw cycle test, the appearance quality has no front sticky skin and defect, no edge and corner loss, no crack, color difference, layering and the like, and the strength loss is 15%. After the water permeable brick is used for 3 years, the water permeability coefficient (15 ℃) is 3.6 multiplied by 10-2cm/s, and the stain resistance rating is 2.
The water permeable brick prepared in the example 1 has the following performance indexes: the compressive strength is 55.0Mpa, the length of a grinding pit is 29mm, and the water permeability coefficient (15 ℃) is 7.5 multiplied by 10-2cm/s; after the freeze-thaw cycle test, the appearance quality has no front sticky skin and defect, no edge and corner loss, no crack, color difference, layering and the like, and the strength loss is 14%. After the water permeable brick is used for 3 years, the water permeability coefficient (15 ℃) is 7.1 multiplied by 10-2cm/s, and the stain resistance rating is 0.
As can be seen by comparison, the water permeable brick prepared by the method of example 1 is different from the water permeable brick prepared by the method of comparative example 2 only in terms of the binder, and has different properties. The water permeable brick of example 1 had a much higher water permeability coefficient after 3 years of use than the water permeable brick of comparative example 1. And the stain resistance rating of comparative example 1 (grade 2) is lower than that of example 1 (grade 0).
The inventor analyzes the reason that the water permeability coefficient and the stain resistance of the natural stone-like water permeable brick prepared by the non-aqueous binder are poor, and probably after the non-aqueous binder is solidified, burrs formed after the binder is solidified exist in a microporous structure in the brick, and the burrs are easy to adsorb capillary pores of pollutants, so that the water permeability and the stain resistance of the brick are poor.
The stain resistance of the natural-like stone water permeable bricks prepared in examples 1 to 3 and comparative examples 1 and 2 was rated by GB/T9780-2013, and the rating is shown in Table 1 below.
TABLE 1
| Stain resistance rating/grade | Degree of contamination | Color difference of appearance | Grey card grade/grade |
| 0 | No pollution | No perceptible color difference | 5 |
| 1 | Very slight | With just noticeable color difference | 4 |
| 2 | Light and slight | Has obvious color difference | 3 |
| 3 | Medium and high grade | With a very pronounced chromatic aberration | 2 |
| 4 | Severe severity of disease | With severe color difference | 1 |
Comparative example 3
The performance indexes of the water permeable bricks prepared in examples 1 to 3 and comparative examples 1 to 2, the water permeable brick of example 1 of application No. 201610367940.3, and a commercially available water permeable brick were compared. As shown in table 2.
TABLE 2
The comparison shows that the water permeable brick has the highest strength and the best pollution resistance. The water permeable brick has a compact surface layer, so that the water permeability is slightly reduced compared with that of the water permeable brick of application No. 201610367940.3, but the water permeability of the water permeable brick is reduced to a lower extent after 3 years of use, and the water permeability of the water permeable brick is reduced by about 15-16% after 3 years of use; the water permeability of the water permeable brick is reduced by about 3-5% after the water permeable brick is used for 3 years. The compressive strength of the water permeable brick is higher, and most importantly, the stain resistance of the water permeable brick is improved by 2 grades.
Therefore, compared with other water permeable bricks, the natural stone imitation stain resistant water permeable brick has the advantages of higher compressive strength, better stain resistance, good water permeability, lower water permeability reduction degree after 3 years of use, longer water permeable life and the like compared with the common water permeable brick.
Claims (5)
1. The natural stone imitated stain-resistant water permeable brick is characterized by comprising a stain-resistant water permeable surface layer and a water permeable base layer, wherein the stain-resistant water permeable surface layer is prepared from the following raw materials in parts by weight: 10-15 parts of cement, 0.5-2 parts of water-based binder, 65-75 parts of modified fine aggregate, 2-4.5 parts of water, 1.5-2 parts of water penetrating agent and 3-8 parts of pigment; the permeable base layer is prepared from the following raw materials in parts by mass: 15-25 parts of fly ash, 5-10 parts of cement, 10-20 parts of carbide slag, 5-15 parts of furnace slag, 15-20 parts of construction waste, 2-4 parts of a water penetrating agent and 3-8 parts of water;
the modified fine aggregate comprises the following components in percentage by weight: aqueous binder: fine aggregate = 1: 5: 800, the mixing amount of the antioxidant is 0.1 to 0.5 percent of the water-based binder;
the preparation method of the modified fine aggregate comprises the following steps: and (2) putting the fine aggregate into a stirrer, adding a small amount of aqueous binder, stirring, gradually adding the rest aqueous binder and the rest antioxidant, uniformly stirring, finally adding the coagulant, and continuously stirring for 5-10 minutes to obtain the modified fine aggregate.
2. The natural stone imitation stain-resistant water permeable brick as claimed in claim 1, wherein the mass ratio of the stain-resistant water permeable surface layer to the water permeable base layer is 1: 7.5-8.5.
3. The natural stone imitation stain-resistant water permeable brick as claimed in claim 2, wherein the mass ratio of the stain-resistant water permeable surface layer to the water permeable base layer is 1: 8.
4. The natural stone imitation stain resistant water permeable brick according to claim 1, wherein the modified fine aggregate is obtained by modifying fine aggregate;
the fine aggregate is one or more of granite chips, marble chips, quartz sand and silica sand, and the particle size is 40-80 meshes.
5. The method for preparing the natural stone imitation stain resistant water permeable brick of claim 1 is characterized by comprising the following process steps:
(1) preparation of modified Fine aggregate
Putting the fine aggregate into a stirrer, adding a small amount of aqueous binder, stirring, gradually adding the rest aqueous binder and the rest antioxidant, uniformly stirring, finally adding the coagulant, and continuously stirring for 5-10 minutes to obtain the modified fine aggregate;
(2) preparing materials for the stain-resistant water-permeable surface layer: firstly, mixing and stirring cement, modified fine aggregate and pigment uniformly, then adding water, a water-based binder and a water penetrating agent, and stirring uniformly by using a stirrer for later use;
(3) preparing materials for the permeable base layer: firstly, uniformly stirring and mixing the fly ash, the cement, the carbide slag, the furnace slag and the construction waste, then adding water and a water-permeable agent, and uniformly stirring by using a stirrer for later use;
(4) molding: feeding the materials in the step (2) and the step (3) into a fabric distributor to start distribution, and carrying out die pressing and vibrating formation;
(5) and (5) feeding the formed permeable green bricks into a curing kiln for curing.
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| CN113501678B (en) * | 2021-08-10 | 2022-01-07 | 温州恒福新型建材有限公司 | Stone-like ecological water permeable brick and preparation method thereof |
| CN113416461B (en) * | 2021-08-10 | 2021-12-21 | 温州恒福新型建材有限公司 | Natural stone imitated stain-resistant water permeable brick and preparation method thereof |
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