CN108383457B - High-strength heavy slag pervious concrete and preparation method thereof - Google Patents
High-strength heavy slag pervious concrete and preparation method thereof Download PDFInfo
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- CN108383457B CN108383457B CN201810401632.7A CN201810401632A CN108383457B CN 108383457 B CN108383457 B CN 108383457B CN 201810401632 A CN201810401632 A CN 201810401632A CN 108383457 B CN108383457 B CN 108383457B
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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
- 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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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The invention discloses high-strength heavy slag pervious concrete which comprises 195-255 parts of ordinary portland cement, 1300-1600 parts of coarse aggregate, 75-105 parts of mineral powder, 50-70 parts of fly ash, 8.5-25.5 parts of an additive and 90-120 parts of water. Wherein, the coarse aggregate is common broken stone and reinforced heavy slag, the reinforced heavy slag is formed by covering a layer of thin high-strength mortar on the surface of the common heavy slag to complete 'shell-making' reinforcement, and the high-strength mortar is prepared by additionally adopting water, common silicate cement, fine sand and a water reducing agent in proportion. The 28d compressive strength and the water permeability of the prepared permeable concrete finished product are greatly enhanced by replacing common heavy slag in the prior art with the reinforced heavy slag and repeatedly testing and verifying relevant weight proportion; although the cost of the reinforced heavy slag is increased, the application range is wide, and the excellent performance can bring considerable benefits.
Description
Technical Field
The invention belongs to the technical field of pervious concrete preparation, and particularly relates to high-strength heavy slag pervious concrete and a preparation method thereof.
Background
Blast furnace heavy slag (called heavy slag for short) is hard stone industrial waste formed by discharging molten slag generated when iron oxide is reduced into metallic iron at high temperature from a blast furnace and naturally and slowly cooling the molten slag in air during iron making of the blast furnace. Along with the increase of the national environmental protection intensity, the control on quarrying is also stricter and stricter, and simultaneously, the heavy slag generated by metals such as smelting steel and the like is discharged and stockpiled, so that the land is occupied, and the environment is polluted. Therefore, more and more attention is paid to the comprehensive utilization of industrial solid waste resources such as heavy slag and the like.
In the prior art, the strength grade of the conventional pervious concrete is difficult to exceed C30 in order to ensure good water permeability. The heavy slag partially or completely replaces one or more components in the traditional concrete raw materials, which is a very common and widely applied technical means, but compared with the traditional concrete, the prepared heavy slag concrete has limitations in the aspects of strength, water permeability, application range and the like. For example, the high titanium heavy slag concrete provided by the patent No. 2013106558731 "C55-C65 high titanium heavy slag concrete" has better 28d compressive strength, but is not suitable for the field of pervious concrete. For example, patent No. 201710412204X "a heavy slag composite sand-based permeable brick with high blast furnace content and its efficient preparation method", and patent No. 2013105457216 "a colored high titanium heavy slag permeable pavement brick and its production method" provide a heavy slag permeable brick with good water permeability, but because it is added with fine aggregate such as sand, its water permeability principle is to let water flow out from the brick joints, and permeable concrete with cellular porous structure has its water permeability principle is to let water seep out from the holes inside the permeable concrete, so the technical process of the permeable brick is difficult to be used in permeable concrete.
Disclosure of Invention
In order to solve the problem that the compressive strength and the water permeability of the concrete are difficult to combine, the invention provides high-strength heavy slag permeable concrete and a preparation method thereof, and the concrete is realized by the following technology.
The high-strength heavy slag permeable concrete is characterized by comprising the following raw material components in parts by weight: 195-255 parts of ordinary portland cement, 1300-1600 parts of coarse aggregate, 75-105 parts of mineral powder, 50-70 parts of fly ash, 8.5-25.5 parts of an additive and 90-120 parts of water;
wherein the coarse aggregate is common crushed stone and reinforced heavy slag; the preparation method of the reinforced heavy slag comprises the following steps; according to the weight ratio of 1: 0.15-0.25: 0.8-1.3: 0.6-0.8: 0.01-0.02 additionally weighing common heavy slag, water, common Portland cement, fine sand and a water reducing agent, wherein the mud content of the common heavy slag is not more than 1%; firstly, uniformly mixing water, common portland cement, fine sand and a water reducing agent to form dilute high-strength mortar, pouring common heavy slag into the dilute high-strength mortar for stirring, coating a layer of high-strength mortar, then, leaching and cooling until the high-strength mortar on the surface of the common heavy slag is hardened, and finally, preparing the reinforced heavy slag with the gradation of 5-25 mm; in the additive components, the ratio of silica fume: bentonite: emulsion powder: the water reducing agent is 4-10: 0.5-0.8: 0.5-0.8: 0.1 to 0.3.
Preferably, the high-strength heavy slag pervious concrete comprises the following raw material components in parts by weight: comprises the following raw material components by weight: 210-235 parts of ordinary portland cement, 1350-1500 parts of coarse aggregate, 85-95 parts of mineral powder, 50-70 parts of fly ash, 13.5-18.5 parts of an additive and 97-110 parts of water.
More preferably, the high-strength heavy slag pervious concrete comprises the following raw material components in parts by weight: comprises the following raw material components by weight: 225 parts of ordinary portland cement, 1450 parts of coarse aggregate, 80 parts of mineral powder, 60 parts of fly ash, 16 parts of additive and 103 parts of water.
Preferably, the weight ratio of the common crushed stone to the reinforced heavy slag in the coarse aggregate is 0.7-1.5: 1.
preferably, the weight ratio of the common crushed stone to the reinforced heavy slag in the coarse aggregate is 1.2: 1.
preferably, in the preparation method of the reinforced heavy slag, the weight ratio of the weighed common heavy slag, water, common portland cement, fine sand and water reducing agent is 1: 0.2: 1.1: 0.8: 0.02.
the invention also provides a preparation method of the high-strength heavy slag pervious concrete, which is characterized by comprising the following steps of:
s1, weighing ordinary portland cement, mineral powder, fly ash, an additive and water, and uniformly stirring to obtain cement mortar;
s2, adding coarse aggregate into the cement mortar, uniformly mixing, and forming and hardening to obtain a concrete semi-finished product;
and S3, sprinkling water to the semi-finished concrete product at room temperature for curing to obtain the finished concrete product.
Compared with the prior art, the invention has the advantages that:
1. the method is characterized in that a layer of cement is wrapped on the surface of common heavy slag by using dilute high-strength mortar and hardened, and the common heavy slag is subjected to 'shell-making' strengthening treatment, so that the strength of the strengthened heavy slag is greatly improved, and compared with the method adopting the common heavy slag, the compressive strength of a concrete finished product is obviously improved;
2. the product has high compressive strength and good water permeability;
3. and the heavy slag is adopted to replace part of crushed stones to be used as coarse aggregate, so that the cost is lower and the environment is more protected.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and 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 and specifications used in the following examples and comparative examples are shown in Table 1 below.
Table 1: raw materials and specifications
| Raw material | Specification or trade mark | Producing area |
| Ordinary portland cement | Whelk P.042.5 | (Wuhan) |
| Fly ash | Class II blue electricity | (Wuhan) |
| Mineral powder | Wuxin grade S95 | (Wuhan) |
| Silica fume | (Wuhan) | |
| Reinforced heavy slag | The particle diameter is 5-25 mm | (Wuhan) |
| Ordinary heavy slag | The grain diameter is 5-25 mm, the mud content is less than or equal to 1 percent | (Wuhan) |
Among the components of the admixture used in the following examples and comparative examples, silica fume: bentonite: emulsion powder: the water reducing agent is 8.5: 0.6: 0.6: 0.3.
examples 1 to 5 and comparative examples 1 to 2
The high-strength heavy slag permeable concrete prepared in the embodiments 1 to 5 and the comparative examples 1 to 2 comprises the following raw material components in parts by weight: ordinary portland cement, coarse aggregate, mineral powder, fly ash, an additive and water. The parts by weight of each raw material of each example or comparative example are shown in Table 2 below.
Table 2: formulation and parts by weight of heavy slag concrete of examples 1 to 5 and comparative examples 1 to 2
In examples 1 to 5 and comparative examples 1 to 2, the coarse aggregate was ordinary crushed stone and reinforced heavy slag, and the weight ratio of the crushed stone to the reinforced heavy slag was 1.2: 1; the preparation method of the reinforced heavy slag comprises the following steps; according to the weight ratio of 1: 0.2: 1.1: 0.8: 0.02 additionally weighing common heavy slag, water, common Portland cement, fine sand and a water reducing agent, wherein the mud content of the common heavy slag is not more than 1%; firstly, uniformly mixing water, common portland cement, fine sand and a water reducing agent to form dilute high-strength mortar, then pouring common heavy slag into the dilute high-strength mortar for stirring, after wrapping a layer of high-strength mortar, leaching and cooling until the high-strength mortar on the surface of the common heavy slag is hardened, and finally preparing the reinforced heavy slag with the gradation of 5-25 mm.
The high-strength heavy slag permeable concrete prepared in the embodiments 1 to 5 and the comparative examples 1 to 2 is prepared by the following method:
s1, weighing ordinary portland cement, mineral powder, fly ash, an additive and water, and uniformly stirring to obtain cement mortar;
s2, adding coarse aggregate into the cement mortar, uniformly mixing, and forming and hardening to obtain a concrete semi-finished product;
and S3, sprinkling water to the semi-finished concrete product at room temperature for curing to obtain the finished concrete product.
Examples 6 to 7 and comparative examples 3 to 4
The high-strength heavy slag permeable concrete prepared in the embodiments 6 to 7 and the comparative examples 3 to 4 comprises the following raw material components in parts by weight: 225 parts of ordinary portland cement, 1450 parts of coarse aggregate, 80 parts of mineral powder, 60 parts of fly ash, 16 parts of additive and 103 parts of water.
Wherein the coarse aggregate is common crushed stone and reinforced heavy slag, and the weight ratio of the common crushed stone to the reinforced heavy slag is shown in Table 3 below.
TABLE 3 weight ratio of ordinary crushed stone to reinforcing heavy slag in raw coarse aggregates of examples 6 to 7 and comparative examples 3 to 4
In examples 6 to 7 and comparative examples 3 to 4, the coarse aggregate is common crushed stone and reinforced heavy slag, and the weight ratio of the common crushed stone to the reinforced heavy slag is 1.2: 1; the preparation method of the reinforced heavy slag comprises the following steps; according to the weight ratio of 1: 0.2: 1.1: 0.8: 0.02 additionally weighing common heavy slag, water, common Portland cement, fine sand and a water reducing agent, wherein the mud content of the common heavy slag is not more than 1%; firstly, uniformly mixing water, common portland cement, fine sand and a water reducing agent to form dilute high-strength mortar, then pouring common heavy slag into the dilute high-strength mortar for stirring, after wrapping a layer of high-strength mortar, leaching and cooling until the high-strength mortar on the surface of the common heavy slag is hardened, and finally preparing the reinforced heavy slag with the gradation of 5-25 mm.
The methods for producing the high-strength heavy slag permeable concrete of examples 6 to 7 and comparative examples 3 to 4 are the same as those of examples 1 to 5 and comparative examples 1 to 2.
Examples 8 to 9 and comparative examples 5 to 6
The high-strength heavy slag permeable concrete prepared in the embodiments 8 to 9 and the comparative examples 5 to 6 comprises the following raw material components in parts by weight: 225 parts of ordinary portland cement, 1450 parts of coarse aggregate, 80 parts of mineral powder, 60 parts of fly ash, 16 parts of additive and 103 parts of water.
In examples 8 to 9 and comparative examples 5 to 6, the coarse aggregate was ordinary crushed stone and reinforced heavy slag, and the weight ratio of the crushed stone to the reinforced heavy slag was 1.2: 1.
the preparation method of the reinforced heavy slag comprises the following steps; and (2) additionally weighing water and common portland cement according to the weight ratio of the following table 4, uniformly mixing to obtain dilute high-strength mortar, introducing common heavy slag with the mud content not more than 1% into the dilute high-strength mortar, stirring, coating a layer of high-strength mortar, draining, cooling to harden the high-strength mortar on the surface of the common heavy slag, and finally preparing the reinforced heavy slag with the gradation of 5-25 mm.
TABLE 4 production of raw Material-reinforced heavy slag of examples 8 to 9 and comparative examples 5 to 6 by ordinary heavy slag, water, ordinary portland cement, fine sand and
weight ratio of water reducing agent
| Group name | The weight ratio of common heavy slag, water, common Portland cement, fine sand and water reducing agent |
| Example 8 | 1：0.3：1.3：0.6：0.02 |
| Example 9 | 1：0.3：0.8：0.8：0.02 |
| Comparative example 5 | 1：0.3：1.4：0.5：0.02 |
| Comparative example 6 | 1：0.3：0.7：0.9：0.02 |
The methods for producing the high-strength heavy slag permeable concrete of examples 8 to 9 and comparative examples 5 to 6 are the same as those of examples 1 to 5 and comparative examples 1 to 2.
Comparative example 7
The high-strength heavy slag permeable concrete prepared by the comparative example comprises the following raw material components in parts by weight: 225 parts of ordinary portland cement, 1450 parts of coarse aggregate, 80 parts of mineral powder, 60 parts of fly ash, 16 parts of additive and 103 parts of water.
Wherein, the coarse aggregate is ordinary rubble and ordinary heavy slag, and the weight ratio of both is 1.2: 1; the reinforced heavy slag is 5-25 mm in gradation.
The preparation method of the high-strength heavy slag pervious concrete prepared by the comparative example is the same as that of the examples 1-5 and the comparative examples 1-2.
Application example
28d compressive strength and water permeability of a high strength heavy slag permeable concrete prepared in examples 1 to 9 and comparative examples 1 to 7 were measured, respectively. The specific results are shown in Table 3 below.
Table 4: results of examining the main properties of reactive powder concrete in examples 1 to 9 and comparative examples 1 to 7
As can be seen from the comparison between examples 1 to 5 and comparative examples 1 to 2, the high-strength heavy slag permeable concrete prepared by the formulation of examples 1 to 5 has better 28d compressive strength and water permeability, and the best concrete of example 1 is.
It can be seen from comparison of examples 1, 6 and 7 with comparative examples 3 and 4 that the high strength heavy slag pervious concrete prepared by using the weight ratio of the ordinary crushed stone and the reinforced heavy slag of examples 1, 6 and 7 has better 28d compressive strength and water permeability, wherein the weight ratio of the ordinary crushed stone and the reinforced heavy slag of example 1 is the best.
It can be seen from the comparison of examples 1, 8 and 9 with comparative examples 5 and 6 that, in the preparation process of the reinforced heavy slag, the weight ratio of the ordinary heavy slag, water, ordinary portland cement, fine sand and the water reducing agent of examples 1, 8 and 9 is the best, and the prepared thin high-strength mortar is wrapped on the surface of the ordinary heavy slag, so that the 28d compressive strength of the final concrete product is improved remarkably, wherein the 28d compressive strength of the final concrete product is improved remarkably in example 1.
As can be seen from comparison of example 1 and comparative example 7, the high-strength heavy slag permeable concrete prepared using the reinforced heavy slag has better 28d compressive strength and water permeability than the high-strength heavy slag permeable concrete prepared using the general heavy slag under the same conditions.
Claims (6)
1. The high-strength heavy slag permeable concrete is characterized by comprising the following raw material components in parts by weight: 195-255 parts of ordinary portland cement, 1300-1600 parts of coarse aggregate, 75-105 parts of mineral powder, 50-70 parts of fly ash, 8.5-25.5 parts of an additive and 90-120 parts of water;
wherein the coarse aggregate is prepared from common crushed stone and reinforced heavy slag according to the weight ratio of 0.7-1.5: 1, mixing to obtain the product; the preparation method of the reinforced heavy slag comprises the following steps; according to the weight ratio of 1: 0.15-0.25: 0.8-1.3: 0.6-0.8: weighing common heavy slag, water, common Portland cement, fine sand and a water reducing agent by 0.01-0.02, wherein the mud content of the common heavy slag is not more than 1%; firstly, uniformly mixing water, common portland cement, fine sand and a water reducing agent to form dilute high-strength mortar, pouring common heavy slag into the dilute high-strength mortar for stirring, coating a layer of high-strength mortar, then, leaching and cooling until the high-strength mortar on the surface of the common heavy slag is hardened, and finally, preparing the reinforced heavy slag with the gradation of 5-25 mm;
the additive is prepared from silica fume, bentonite, latex powder and a water reducing agent according to a weight ratio of 4-10: 0.5-0.8: 0.5-0.8: 0.1-0.3, and mixing.
2. The high-strength heavy slag permeable concrete according to claim 1, which is characterized by comprising the following raw material components in parts by weight: 210-235 parts of ordinary portland cement, 1350-1500 parts of coarse aggregate, 85-95 parts of mineral powder, 50-70 parts of fly ash, 13.5-18.5 parts of an additive and 97-110 parts of water.
3. The high-strength heavy slag permeable concrete according to claim 2, which is characterized by comprising the following raw material components in parts by weight: 225 parts of ordinary portland cement, 1450 parts of coarse aggregate, 80 parts of mineral powder, 60 parts of fly ash, 16 parts of additive and 103 parts of water.
4. The high-strength heavy slag pervious concrete according to claim 1, wherein the weight ratio of the common crushed stones to the reinforced heavy slag in the coarse aggregate is 1.2: 1.
5. the high-strength heavy slag pervious concrete according to any one of claims 1 to 4, characterized in that in the preparation method of the reinforced heavy slag, the weight ratio of the ordinary heavy slag, water, ordinary portland cement, fine sand and water reducing agent is 1: 0.2: 1.1: 0.8: 0.02.
6. the method for preparing high-strength heavy slag pervious concrete according to any one of claims 1 to 4, characterized by comprising the steps of:
s1, weighing ordinary portland cement, mineral powder, fly ash, an additive and water, and uniformly stirring to obtain cement mortar;
s2, adding coarse aggregate into the cement mortar, uniformly mixing, and forming and hardening to obtain a concrete semi-finished product;
and S3, sprinkling water to the semi-finished concrete product at room temperature for curing to obtain the finished concrete product.
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| CN111908883B (en) * | 2020-07-31 | 2022-01-07 | 上海航烯环保科技有限公司 | Composite binder and permeable surface layer coated particles and permeable material prepared from same |
| CN112047678B (en) * | 2020-08-10 | 2022-09-13 | 武汉富洛泰克材料科技有限公司 | Colored artificial stone permeable sand-based pavement material and preparation method thereof |
| CN111978056A (en) * | 2020-08-27 | 2020-11-24 | 中国建筑材料科学研究总院有限公司 | Modified material of low-quality aggregate and treatment method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935185A (en) * | 2009-07-02 | 2011-01-05 | 余春冠 | Additive for preparing mortar from fine sand |
| CN103541289A (en) * | 2013-11-06 | 2014-01-29 | 攀枝花环业冶金渣开发有限责任公司 | Colored high-titanium heavy slag permeable pavement brick and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935185A (en) * | 2009-07-02 | 2011-01-05 | 余春冠 | Additive for preparing mortar from fine sand |
| CN103541289A (en) * | 2013-11-06 | 2014-01-29 | 攀枝花环业冶金渣开发有限责任公司 | Colored high-titanium heavy slag permeable pavement brick and production method thereof |
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