CN112645663A - Concrete for landscape wall and preparation method thereof - Google Patents
Concrete for landscape wall and preparation method thereof Download PDFInfo
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- CN112645663A CN112645663A CN202110042496.9A CN202110042496A CN112645663A CN 112645663 A CN112645663 A CN 112645663A CN 202110042496 A CN202110042496 A CN 202110042496A CN 112645663 A CN112645663 A CN 112645663A
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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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- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides concrete for a landscape wall, which comprises the following raw materials in parts by weight: 130 parts of sand 120-. The invention also provides a preparation method of the concrete. The concrete provided by the invention has good physical mechanical properties and durability, obviously improves the properties such as cohesiveness, water retention, compressive strength and appearance, and effectively improves the workability of concrete mixtures.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to concrete for a landscape wall and a preparation method thereof.
Background
The landscape wall is a general name, has no fixed form, has various materials for realizing, such as metal, wood art, fair-faced concrete and bricks, has different functions, such as separation, decoration and shielding, meets the functions, endows the landscape wall with artistic quality, and adds more elegance and fun for life.
Among them, the fair-faced concrete is an expression technique of modern building art, and is also called as decorative concrete because of its excellent decorative effect. The fair-faced concrete is a natural decorative surface which is formed by pouring and forming once without any external decoration and is directly formed by combining the texture and the texture of the concrete of a structural body, open joints, Buddhist joints, split bolt holes and the like which are elaborately designed and constructed. The concrete material is the highest expression mode in concrete materials, shows the most essential aesthetic feeling, has simple and luxurious appearance lingering charm, is naturally sinking and stable, and has the inherent thickness and elegance which cannot be imitated and compared favorably with some modern building materials.
The construction requires that the fair-faced concrete for the landscape wall has the characteristics of good workability, uniformity, water retention and the like; after the concrete is formed, the formed landscape wall is also required to have compact surface, no bubbles or few bubbles, no chromatic aberration and strength meeting the design requirement. However, the workability, uniformity and water retention of the existing concrete are poor; after the concrete is formed, the surface of the formed landscape wall is uneven in color and luster and more in bubbles, the appearance aesthetics of the landscape wall is seriously influenced, and the compressive strength cannot meet the design requirement.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the concrete for the landscape wall and the preparation method thereof, which effectively solve the problems of poor workability, uniformity and water retention of the existing concrete; after the concrete is formed, the formed landscape wall has uneven surface color and more bubbles, the appearance aesthetics of the landscape wall is seriously influenced, and the compressive strength cannot meet the design requirement.
The invention solves the technical problems through the following technical means:
the concrete for the landscape wall comprises the following raw materials in parts by weight: 130 parts of sand 120-.
As an improvement of the technical scheme, the concrete comprises the following raw materials in parts by weight: 127 parts of 123-mesh sand, 258 parts of 250-mesh stone, 100 parts of cement, 37-40 parts of water, 14-16 parts of attapulgite powder, 8-9 parts of polycarboxylic acid water reducing agent, 0.05-0.065 part of water-retaining agent, 0.1-0.24 part of retarder and 0.13-0.22 part of defoaming agent.
As an improvement of the technical scheme, the retarder is one of lignin sulfur sulfonate, sodium pyrophosphate and borax.
As an improvement of the technical scheme, the water retaining agent is a cellulose ether water retaining agent.
As an improvement of the technical scheme, the sand rate is 33 percent.
As an improvement of the technical scheme, the sand is medium sand, and the mud content is 0.2%.
As an improvement of the technical scheme, the nominal particle size of the stones is 5-31.5mm, and the mud content is 0.2%.
As an improvement of the technical scheme, the cement is ordinary portland cement with the strength grade of 42.5 MPa.
The invention also provides a preparation method of the concrete, which comprises the following steps:
s1, uniformly dry-mixing sand, pebbles, cement and attapulgite powder in parts by weight, adding half of water, and mixing to obtain a mixture;
s2, uniformly stirring a polycarboxylic acid water reducing agent, a water retaining agent, a retarder, a defoaming agent and the residual water in parts by weight, adding the mixture into the mixture of S1, and uniformly stirring to obtain a concrete mixture;
and S3, pouring the concrete mixture obtained in the step S2 into a mold, and vibrating the concrete mixture to form floating slurry by using a vibrating rod without obvious bubbles to obtain the concrete.
The invention has the beneficial effects that: the concrete provided by the invention has good physical mechanical properties and durability, obviously improves the properties such as cohesiveness, water retention, compressive strength and appearance, and effectively improves the workability of concrete mixtures.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the 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 raw materials adopted by the invention are conventional commercial products, and can be purchased in the market.
Natural sand is further classified into river sand, sea sand and mountain sand. The thickness of the sand is divided according to the size of the fineness modulus MX as follows:
coarse sand: MX is 3.7-3.1, and the average particle size is more than 0.5 mm;
medium sand: MX is 3.0-2.3, and the average particle size is 0.5-0.35 mm;
fine sand: MX is 2.2-1.6, and the average particle size is 0.35-0.25 mm;
ultra-fine sand: MX is 1.5-0.7, and average particle diameter is below 0.25 mm.
The concrete for the landscape wall comprises the following raw materials in parts by weight: 130 parts of sand 120-.
The cement is ordinary Portland cement with the strength grade of 42.5 MPa.
The attapulgite is also called palygorskite or palygorskite and is a hydrous magnesium-rich aluminosilicate clay mineral with a chain lamellar structure. It has excellent colloid property of dispersing, high temperature resistance, salt and alkali resistance, etc. and high adsorption decolorizing capacity, and has certain plasticity and adhesion. The attapulgite powder adopted by the invention has the following characteristics: 1) the thickening property is good; 2) the suspension property is good: effectively preventing concrete from precipitating and layering; 3) the shaking and melting performance is good; 4) the thixotropy is good: the additive is directly added, has good compatibility, and does not need to change the process and the formula; 5) the leveling property is good: shrinkage cavities and fish eyes are prevented, and sagging is avoided; 6) the weather resistance is good: the coating has strong acid and alkali resistance, corrosion resistance and mildew resistance; 7) good heat insulation: high temperature resistance, heat insulation and insulation; 8) the environmental protection property is good: chemical inertness, no pollution, inhibition of microbial growth, absorption of toxic volatile components, green and environmental protection.
The polycarboxylate superplasticizer is a high-performance superplasticizer, has super-dispersibility, can prevent concrete slump loss without causing obvious retardation, exerts higher plasticizing effect under low doping amount, enables the concrete to have good fluidity, has obvious concrete reinforcing effect, can reduce concrete shrinkage, has the technical performance characteristics of extremely low content of harmful substances and the like, endows the concrete with excellent construction workability, good strength and excellent durability, and has good comprehensive technical performance advantages and environmental protection characteristics.
The polycarboxylic acid water reducing agent has the following advantages: 1) the concrete has good compatibility with various cements, good slump retention performance of the concrete, and prolonged construction time of the concrete; 2) the mixing amount is low, the water reducing rate is high, and the shrinkage is small; 3) the early and later strength of the concrete is greatly improved; 4) the content of chloride ions and alkali is low, which is beneficial to the durability of concrete; 5) the production process is pollution-free, does not contain formaldehyde, meets the international standard of ISO14000 environmental protection management, and is a green and environment-friendly product.
The water-retaining agent is a cellulose ether water-retaining agent.
The retarder is an additive which can delay cement hydration reaction, thereby prolonging the setting time of concrete, keeping the plasticity of fresh concrete for a long time, facilitating pouring, improving the construction efficiency and simultaneously not causing adverse effect on various performances at the later stage of the concrete. The retarder is one of lignin sulfur sulfonate, sodium pyrophosphate and borax.
In concrete, sand and stones play a role in not only filling, but also serving as frameworks for limiting the deformation of cement stones, increasing rigidity, improving strength and crack resistance, and the like, and the similar frameworks play a role in supporting so that the concrete becomes firmer. The cement and the water are stirred according to a certain proportion to form cement paste, and when the concrete is formed, the cement paste well fills gaps among the gravels, so that the strength of the concrete is further strengthened. And the cement paste can keep certain fluidity of the concrete during construction, the plasticity is higher, and the construction is convenient. According to the invention, through adding the attapulgite powder, the polycarboxylic acid water reducing agent, the water retaining agent, the retarder and the defoaming agent in a specific ratio, the workability of a mixture can be improved before hardening, and the physical mechanical property and the durability of concrete can be improved after hardening, so that the comprehensive performance of the concrete is improved.
The sand ratio is the percentage of the mass of sand in the concrete to the total mass of sand and gravel. Variations in sand rate can cause significant changes in the total surface area of the aggregate, thereby having a greater impact on the workability of the concrete mix. The principle of determining the sand rate is as follows: on the premise of ensuring the viscosity polymer and the fluidity of the concrete mixture, the cement paste has the optimal sand rate in the most time-saving way. In the present invention, the sand ratio is preferably 33%.
Preferably, the sand is medium sand, and the mud content is 0.2%. The sand producing area and variety are jing county/river sand.
Preferably, the nominal particle size of the stones is 5-31.5mm, and the mud content is 0.2%. The stone producing area and variety are Anqing/gravel.
The invention also provides a preparation method of the concrete, which comprises the following steps:
s1, uniformly dry-mixing sand, pebbles, cement and attapulgite powder in parts by weight, adding half of water, and mixing to obtain a mixture;
s2, uniformly stirring a polycarboxylic acid water reducing agent, a water retaining agent, a retarder, a defoaming agent and the residual water in parts by weight, adding the mixture into the mixture of S1, and uniformly stirring to obtain a concrete mixture;
and S3, pouring the concrete mixture obtained in the step S2 into a mold, and vibrating the concrete mixture to form floating slurry by using a vibrating rod without obvious bubbles to obtain the concrete.
Example 1
The concrete for the landscape wall designed by the embodiment comprises the following raw materials in parts by mass: 120 parts of sand, 264 parts of pebbles, 100 parts of cement, 35 parts of water, 12 parts of attapulgite powder, 7 parts of polycarboxylic acid water reducing agent, 0.085 part of water-retaining agent, 0.16 part of retarder and 0.3 part of defoaming agent.
In this example, 1) cement: p.042.5 (same manufacturer and same batch), wherein the manufacturer is an Albobo brand; 2) sand: medium sand with mud content of 0.2%, producing area and variety of jing county/river sand; 3) stone: nominal grain diameter is 5-31.5mm, mud content is 0.2%, and producing area and variety are Anqing/macadam; 4) the water-retaining agent is a cellulose ether water-retaining agent; 5) the retarder is lignin sulfur salt; 6) the sand rate is 31 percent; 7) the concrete design strength was C40.
The preparation method of the concrete comprises the following steps:
s1, uniformly dry-mixing sand, pebbles, cement and attapulgite powder in parts by weight, adding half of water, and mixing to obtain a mixture;
s2, uniformly stirring a polycarboxylic acid water reducing agent, a water retaining agent, a retarder, a defoaming agent and the residual water in parts by weight, adding the mixture into the mixture of S1, and uniformly stirring to obtain a concrete mixture;
and S3, pouring the concrete mixture obtained in the step S2 into a mold, and vibrating the concrete mixture to form floating slurry by using a vibrating rod without obvious bubbles to obtain the concrete.
Example 2
The concrete for the landscape wall designed by the embodiment comprises the following raw materials in parts by mass: 123 parts of sand, 250 parts of pebbles, 100 parts of cement, 40 parts of water, 16 parts of attapulgite powder, 9 parts of polycarboxylic acid water reducing agent, 0.05 part of water-retaining agent, 0.24 part of retarder and 0.13 part of defoaming agent.
In this example, 1) cement: p.042.5 (same manufacturer and same batch), wherein the manufacturer is an Albobo brand; 2) sand: medium sand with mud content of 0.2%, producing area and variety of jing county/river sand; 3) stone: nominal grain diameter is 5-31.5mm, mud content is 0.2%, and producing area and variety are Anqing/macadam; 4) the water-retaining agent is a cellulose ether water-retaining agent; 5) the retarder is sodium pyrophosphate; 6) the sand rate is 33%; 7) the concrete design strength was C40.
The preparation method of the concrete comprises the following steps:
s1, uniformly dry-mixing sand, pebbles, cement and attapulgite powder in parts by weight, adding half of water, and mixing to obtain a mixture;
s2, uniformly stirring a polycarboxylic acid water reducing agent, a water retaining agent, a retarder, a defoaming agent and the residual water in parts by weight, adding the mixture into the mixture of S1, and uniformly stirring to obtain a concrete mixture;
and S3, pouring the concrete mixture obtained in the step S2 into a mold, and vibrating the concrete mixture to form floating slurry by using a vibrating rod without obvious bubbles to obtain the concrete.
Example 3
The concrete for the landscape wall designed by the embodiment comprises the following raw materials in parts by mass: 127 parts of sand, 258 parts of pebbles, 100 parts of cement, 37 parts of water, 14 parts of attapulgite powder, 8 parts of polycarboxylic acid water reducing agent, 0.065 part of water-retaining agent, 0.1 part of retarder and 0.22 part of defoaming agent.
In this example, 1) cement: p.042.5 (same manufacturer and same batch), wherein the manufacturer is an Albobo brand; 2) sand: medium sand with mud content of 0.2%, producing area and variety of jing county/river sand; 3) stone: nominal grain diameter is 5-31.5mm, mud content is 0.2%, and producing area and variety are Anqing/macadam; 4) the water-retaining agent is a cellulose ether water-retaining agent; 5) the retarder is sodium pyrophosphate; 6) the sand rate is 33%; 7) the concrete design strength was C40.
The preparation method of the concrete comprises the following steps:
s1, uniformly dry-mixing sand, pebbles, cement and attapulgite powder in parts by weight, adding half of water, and mixing to obtain a mixture;
s2, uniformly stirring a polycarboxylic acid water reducing agent, a water retaining agent, a retarder, a defoaming agent and the residual water in parts by weight, adding the mixture into the mixture of S1, and uniformly stirring to obtain a concrete mixture;
and S3, pouring the concrete mixture obtained in the step S2 into a mold, and vibrating the concrete mixture to form floating slurry by using a vibrating rod without obvious bubbles to obtain the concrete.
Example 4
The concrete for the landscape wall designed by the embodiment comprises the following raw materials in parts by mass: 130 parts of sand, 244 parts of pebbles, 100 parts of cement, 39 parts of water, 10 parts of attapulgite powder, 8 parts of polycarboxylic acid water reducing agent, 0.1 part of water-retaining agent, 0.3 part of retarder and 0.05 part of defoaming agent.
In this example, 1) cement: p.042.5 (same manufacturer and same batch), wherein the manufacturer is an Albobo brand; 2) sand: medium sand with mud content of 0.2%, producing area and variety of jing county/river sand; 3) stone: nominal grain diameter is 5-31.5mm, mud content is 0.2%, and producing area and variety are Anqing/macadam; 4) the water-retaining agent is a cellulose ether water-retaining agent; 5) the retarder is borax; 6) the sand rate is 35 percent; 7) the concrete design strength was C40.
The preparation method of the concrete comprises the following steps:
s1, uniformly dry-mixing sand, pebbles, cement and attapulgite powder in parts by weight, adding half of water, and mixing to obtain a mixture;
s2, uniformly stirring a polycarboxylic acid water reducing agent, a water retaining agent, a retarder, a defoaming agent and the residual water in parts by weight, adding the mixture into the mixture of S1, and uniformly stirring to obtain a concrete mixture;
and S3, pouring the concrete mixture obtained in the step S2 into a mold, and vibrating the concrete mixture to form floating slurry by using a vibrating rod without obvious bubbles to obtain the concrete.
Comparative example 1
The concrete for the landscape wall designed by the comparative example comprises the following raw materials in parts by mass: 110 parts of sand, 270 parts of stones, 100 parts of cement, 43 parts of water, 7 parts of polycarboxylic acid water reducing agent, 0.4 part of retarder and 0.01 part of defoaming agent.
In this comparative example, 1) cement: p.042.5 (same manufacturer and same batch), wherein the manufacturer is an Albobo brand; 2) sand: medium sand with mud content of 0.2%, producing area and variety of jing county/river sand; 3) stone: nominal grain diameter is 5-31.5mm, mud content is 0.2%, and producing area and variety are Anqing/macadam; 4) the retarder is sodium pyrophosphate; 5) the sand rate is 29 percent; 6) the concrete design strength was C40.
The preparation method of the concrete of the comparative example comprises the following steps:
s1, uniformly stirring sand, stones, cement, a polycarboxylic acid water reducing agent, a retarder, a defoaming agent and water in parts by weight to obtain a concrete mixture;
and S2, pouring the concrete mixture obtained in the step S1 into a mold, and vibrating the concrete mixture to form floating slurry by using a vibrating rod without obvious bubbles to obtain the concrete.
TABLE 1
Examples of the experiments
The concrete of examples 1 to 4 and comparative example 1 were subjected to the performance test under the same test conditions, and the results are shown in Table 2 below.
The slump refers to the workability of concrete, and particularly guarantees the normal operation of construction, wherein the slump includes the water retention, the fluidity and the cohesiveness of the concrete. Workability refers to whether the concrete is easy to construct and operate and is uniform and dense.
Slump test method: a horn-shaped slump cone with an upper opening of 100mm, a lower opening of 200mm and a height of 300mm is used for pouring concrete and tamping, then the cone is vertically pulled upwards, the concrete cannot be touched in the pulling process so as not to influence measurement data, the concrete generates a slump phenomenon due to self weight, and the height of the highest point of the slump concrete is subtracted by the cone height (300mm), so that the slump is called slump.
When the slump is more than 220mm, the slump cannot accurately reflect the fluidity of the concrete, and the average diameter of the concrete after being expanded, namely the slump expansion degree, is used as a fluidity index.
While slump tests were performed, the cohesion and water retention of the concrete mix were observed in order to fully assess the workability of the concrete mix.
The method for evaluating the cohesiveness comprises the following steps: lightly tapping the side surface of the collapsed concrete cone by using a vibrating rod, and if the cone gradually sinks, indicating that the cohesiveness is good; poor cohesion is indicated if the vertebral body collapses, partially collapses or separates.
Water retention is assessed as the degree of dilute cement slurry precipitation in the concrete mix. After the slump cone is lifted, if more dilute cement slurry is separated out from the bottom and aggregates of the concrete mixture at the cone part are exposed due to slurry loss, the water retention performance of the concrete mixture is poor; if no dilute cement slurry or only a small amount of water-absorbing cement slurry is separated out from the bottom after the slump cone is lifted, the water-retaining property of the concrete mixture is good.
The strength grade of concrete refers to the compressive strength of concrete. According to the standard of concrete strength test and evaluation Standard (GB/T50107-2010), the strength grade of the concrete is determined according to the standard value of the cubic compressive strength of the concrete. The symbol C cube compression strength standard value (MPa) is adopted for representation.
TABLE 2
Referring to tables 1-2, it can be seen from the comparison of the data of examples 1-4 and comparative example 1 that the technical effects of the solutions of examples 1-4 in terms of cohesiveness, water retention, compressive strength and appearance are significantly better than those of comparative example 1. Therefore, it can be confirmed that the technical solution of the present invention has a technical effect significantly superior to that of comparative example 1.
Therefore, the concrete adopting the technical scheme of the invention has the unexpected technical effects that: the concrete admixture has the advantages of being good in physical mechanical property and durability, remarkably improving cohesiveness, water retention, compressive strength, appearance and other properties, effectively improving workability of the concrete admixture, and effectively solving the technical problems in the prior art. In addition, the technical characteristics of the technical scheme of the invention have synergistic effect.
The specific technology not described in the present invention is the prior art.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The concrete for the landscape wall is characterized by comprising the following raw materials in parts by weight: 130 parts of sand 120-.
2. The concrete according to claim 1, comprising the following raw materials in parts by weight: 127 parts of 123-mesh sand, 258 parts of 250-mesh stone, 100 parts of cement, 37-40 parts of water, 14-16 parts of attapulgite powder, 8-9 parts of polycarboxylic acid water reducing agent, 0.05-0.065 part of water-retaining agent, 0.1-0.24 part of retarder and 0.13-0.22 part of defoaming agent.
3. The concrete of claim 1, wherein the retarder is one of lignosulfonate, sodium pyrophosphate, and borax.
4. The concrete of claim 1, wherein the water retaining agent is a cellulose ether water retaining agent.
5. The concrete according to claim 1, wherein the sand fraction is 33%.
6. The concrete according to claim 1, wherein the sand is medium sand and the mud content is 0.2%.
7. The concrete according to claim 1, wherein the nominal particle size of the stones is 5-31.5mm and the mud content is 0.2%.
8. The concrete according to claim 1, wherein the cement is ordinary portland cement having a strength grade of 42.5 MPa.
9. A method of producing concrete according to any one of claims 1 to 8, comprising the steps of:
s1, uniformly dry-mixing sand, pebbles, cement and attapulgite powder in parts by weight, adding half of water, and mixing to obtain a mixture;
s2, uniformly stirring a polycarboxylic acid water reducing agent, a water retaining agent, a retarder, a defoaming agent and the residual water in parts by weight, adding the mixture into the mixture of S1, and uniformly stirring to obtain a concrete mixture;
and S3, pouring the concrete mixture obtained in the step S2 into a mold, and vibrating the concrete mixture to form floating slurry by using a vibrating rod without obvious bubbles to obtain the concrete.
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Application publication date: 20210413 |