CN112897957A - High-pressure-resistance silica fume pervious concrete and preparation method thereof - Google Patents
High-pressure-resistance silica fume pervious concrete and preparation method thereof Download PDFInfo
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- CN112897957A CN112897957A CN202110317415.1A CN202110317415A CN112897957A CN 112897957 A CN112897957 A CN 112897957A CN 202110317415 A CN202110317415 A CN 202110317415A CN 112897957 A CN112897957 A CN 112897957A
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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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Abstract
The invention discloses high-pressure-resistance silica fume pervious concrete which comprises the following components in parts by weight: 15-25 parts of silica fume, 140 parts of 120-140 parts of water, 735 parts of 364-735 parts of Portland cement, 25-75 parts of natural zeolite powder, 1.2-3 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 22-45 parts of pulverized fly ash and 5-20 parts of a plastic retaining agent. According to the preparation method of the silica fume pervious concrete with high pressure resistance, silica fume is added into a traditional pervious concrete material and reacts with hydration products to generate gel, so that the compression resistance, the bending resistance, the corrosion resistance, the impact resistance and the wear resistance of the pervious concrete are obviously improved, meanwhile, natural zeolite powder is added into the pervious concrete, and active silicon and active aluminum occluded in a zeolite crystal structure react with Ca (OH)2 provided in the hydration process of cement to generate C-S-H gel and calcium silicate hydrate, so that the concrete is more compact and the strength is improved, and the pervious concrete has higher pressure resistance under the condition of water permeability.
Description
Technical Field
The invention relates to the technical field of pervious concrete, in particular to silica fume pervious concrete with high pressure resistance and a preparation method thereof.
Background
The pervious concrete is a porous light concrete mixed by aggregate, cement, reinforcing agent and water, the pervious concrete is a cellular structure formed by coating a layer of cement slurry on the surface of coarse aggregate and mutually bonding to form pores uniformly distributed, so that it has the characteristics of air permeability, water permeability and light weight, and the pervious concrete is a paving material developed and used by countries of Europe, America, Japan, etc. aiming at the defects of the road surface of the original urban road, said paving material can make rainwater flow into the ground, can effectively supplement underground water, can relieve some urban environmental problems of sudden drop of underground water level, etc., can effectively eliminate the harm of oil compounds on the ground to the environment, at the same time can protect underground water, maintain ecological balance, can relieve urban heat island effect, and is favorable for benign development of human living environment and the prevention and control of urban rainwater pollution, of particular interest, however, pervious concrete has some disadvantages:
the existing pervious concrete has poor compression resistance due to light weight and honeycomb structure, and can not bear excessive pressure on some paved pavements, so that the pervious concrete can only be applied to some sidewalks or garden pavements, and vehicles press the pervious concrete from the pervious concrete to easily cause damage of the pervious concrete.
In order to solve the problems, innovative design is urgently needed on the basis of the original pervious concrete.
Disclosure of Invention
The invention aims to provide silica fume pervious concrete with high compressive resistance and a preparation method thereof, and aims to solve the problems that the existing pervious concrete cannot have both functionality and practicability and cannot be widely applied to urban roads due to poor compressive resistance in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the high-pressure-resistance silica fume pervious concrete comprises the following components in parts by weight: 15-25 parts of silica fume, 140 parts of 120-140 parts of water, 735 parts of 364-735 parts of Portland cement, 25-75 parts of natural zeolite powder, 1.2-3 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 22-45 parts of pulverized fly ash and 5-20 parts of a plastic retaining agent.
Preferably, the high-pressure-resistance silica fume pervious concrete comprises the following components in parts by weight: 15 parts of silica fume, 120 parts of water, 364 parts of Portland cement, 25 parts of natural zeolite powder, 1.2 parts of a retarding superplasticizer, 1428 parts of coarse aggregate, 22 parts of fine grinding fly ash and 5 parts of a plastic retaining agent.
Preferably, the high-pressure-resistance silica fume pervious concrete comprises the following components in parts by weight: 19 parts of silica fume, 130 parts of water, 515 parts of portland cement, 50 parts of natural zeolite powder, 2 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 33 parts of ground fine fly ash and 13 parts of a plastic retaining agent.
Preferably, the high-pressure-resistance silica fume pervious concrete comprises the following components in parts by weight: the composition comprises the following components in parts by weight: 25 parts of silica fume, 140 parts of water, 735 parts of portland cement, 75 parts of natural zeolite powder, 3 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 45 parts of ground fine fly ash and 20 parts of a plastic retaining agent.
A preparation method of silica fume pervious concrete with high pressure resistance comprises the following specific steps:
s1, adding coarse aggregate into the stirring device, and then adding silica fume and natural zeolite powder for dry mixing until the mixture is uniform and has no obvious color difference;
s2, adding 75% of water, coarse aggregate, silica fume and natural zeolite powder, and stirring for 15-30 seconds to obtain a first stirring material;
s3, adding the remaining 25% of water, portland cement, a retarding superplasticizer, ground fly ash and a plasticity-maintaining agent, and stirring uniformly to obtain a second stirred material;
s4, unloading the mixed concrete into a pouring cabin for vibration until the concrete does not sink significantly any more and begins to spread;
and S5, continuously stirring the concrete in the concrete transportation process to prevent the concrete from solidifying.
Preferably, the silica fume is fully dry-mixed with the coarse aggregate and the natural zeolite powder before adding water.
Preferably, the silica fume is strictly forbidden to throw materials at high altitude when in use, so that the silica fume is prevented from flying.
Preferably, the time for each insertion vibration after the concrete is mixed is about 20-30 seconds, and the total vibration time is not suitable for too long.
Preferably, the strength grade of the portland cement is not less than 52.5R.
Compared with the prior art, the invention has the beneficial effects that: according to the silica fume pervious concrete and the preparation method thereof, silica fume is added into a traditional pervious concrete material and reacts with hydration products to generate gel, so that the compression resistance, the bending resistance, the corrosion resistance, the impact resistance and the wear resistance of the pervious concrete are obviously improved, meanwhile, natural zeolite powder is added into the pervious concrete, under the alkaline excitation in the concrete, active silicon and active aluminum which are occluded in a zeolite crystal structure and Ca (OH)2 provided in the hydration process of cement perform secondary reaction to generate C-S-H gel and calcium silicate hydrate, so that the concrete is more compact and the strength is improved, and the pervious concrete obtains higher compression resistance under the condition of water permeability.
Drawings
FIG. 1 is a flow chart of a silica fume pervious concrete with high compressive resistance and a preparation method thereof.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: the composite material comprises the following components in parts by weight: 15-25 parts of silica fume, 140 parts of 120-140 parts of water, 735 parts of 364-735 parts of Portland cement, 25-75 parts of natural zeolite powder, 1.2-3 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 22-45 parts of pulverized fly ash and 5-20 parts of a plastic retaining agent.
Example 1
The high-pressure-resistance silica fume pervious concrete comprises the following components in parts by weight: 15 parts of silica fume, 120 parts of water, 364 parts of Portland cement, 25 parts of natural zeolite powder, 1.2 parts of a retarding superplasticizer, 1428 parts of coarse aggregate, 22 parts of fine grinding fly ash and 5 parts of a plastic retaining agent;
example 2
The high-pressure-resistance silica fume pervious concrete comprises the following components in parts by weight: 19 parts of silica fume, 130 parts of water, 515 parts of portland cement, 50 parts of natural zeolite powder, 2 parts of a retarding superplasticizer, 1428 parts of coarse aggregate, 33 parts of ground fly ash and 13 parts of a plastic retaining agent;
example 3
The high-pressure-resistance silica fume pervious concrete comprises the following components in parts by weight: 25 parts of silica fume, 140 parts of water, 735 parts of portland cement, 75 parts of natural zeolite powder, 3 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 45 parts of ground fine fly ash and 20 parts of a plastic retaining agent.
The technical scheme provides a preparation method of high-compressive-resistance silica fume pervious concrete, which comprises the following steps:
the method comprises the following specific steps:
s1, adding coarse aggregate into the stirring device, and then adding silica fume and natural zeolite powder for dry mixing until the mixture is uniform and has no obvious color difference;
s2, adding 75% of water, coarse aggregate, silica fume and natural zeolite powder, and stirring for 15-30 seconds to obtain a first stirring material;
s3, adding the remaining 25% of water, portland cement, a retarding superplasticizer, ground fly ash and a plasticity-maintaining agent, and stirring uniformly to obtain a second stirred material;
s4, unloading the mixed concrete into a pouring cabin for vibration until the concrete does not sink significantly any more and begins to spread;
and S5, continuously stirring the concrete in the concrete transportation process to prevent the concrete from solidifying.
The silica fume is fully and dry-mixed with the coarse aggregate and the natural zeolite powder before water is added, and the mixing time of the silica fume concrete is prolonged by 1-2 minutes compared with the mixing time of common concrete, so that the concrete is more uniformly mixed, and quality accidents caused by water absorption and agglomeration of the silica fume in the concrete are prevented.
When the silica fume is used, materials are strictly forbidden to be thrown high above the ground, the silica fume is prevented from flying, when the silica fume is used in high-altitude operation, the silica fume is strictly forbidden to be thrown, and once the silica fume is scattered in the air, the silica fume is easy to float along with the air and enters human respiratory tracts to damage the human respiratory tracts.
The time of each insertion vibration after the concrete is mixed is about 20-30 seconds, the total vibration time is not suitable for too long, sand and cement paste can be separated after the concrete is vibrated for too long, stones sink, and a sand layer is formed on the surface of the concrete, so that the quality of the concrete is influenced.
The strength grade of the portland cement is not lower than 52.5R, so that the strength of the concrete is ensured.
The working principle is as follows: firstly, putting all coarse aggregate into a stirring device, then putting the silica fume and the natural zeolite powder into the stirring device together, starting the stirring machine to dry and mix the dry materials of the coarse aggregate, the silica fume and the natural zeolite powder until the coarse aggregate, the silica fume and the natural zeolite powder are completely and uniformly mixed without an obvious boundary, adding 75 percent of water with a preset weight into the stirring device to be stirred for 15-30 seconds to obtain a first stirring material, then adding the remaining 25 percent of water, Portland cement, a retarding superplasticizer, finely ground fly ash and a plastic retention agent, stirring uniformly to obtain a second stirring material, reacting the silica fume with hydration products to generate gel, so that the compression resistance, the folding resistance, the corrosion resistance, the impact resistance and the wear resistance of the pervious concrete are obviously improved, and the natural zeolite powder is subjected to alkaline excitation in the concrete, active silicon and active aluminum occluded in the zeolite crystal structure perform secondary reaction with Ca (OH)2 provided in the cement hydration process to generate C-S-H gel and calcium silicate hydrate, so that the concrete is more compact and the strength is improved, and the pervious concrete has higher compressive resistance under the condition of water permeability;
meanwhile, the addition of the retarding superplasticizer can obviously improve the fluidity and the working degree of concrete, the retarding effect of the concrete before initial setting is obvious, the early strength effect after final setting is obvious, the strength of the concrete at each age can be greatly improved, the slump loss of the concrete in a certain time interval is reduced due to the addition of the plasticity-maintaining agent, the compatibility and the adaptability of the admixture and the portland cement are adjusted, and the admixture can be fully mixed with the portland cement;
then, the mixed concrete is unloaded into a pouring cabin for vibration, the vibration is required to be fast during insertion and slow during pulling out so as to avoid leaving gaps in the concrete, the vibration time is about 20-30 seconds each time, the vibration is stopped until the concrete does not obviously sink, bubbles do not appear and the concrete begins to spread, the vibration time is not suitable for too long, sand and cement paste can be separated after too long, stones sink, and a sand layer is formed on the surface of the concrete, the quality of the concrete is influenced, meanwhile, a vibrator is required to be inserted into the concrete on the lower layer by 10cm during vibration so as to strengthen the combination of the concrete on the upper layer and the lower layer, the distance between the front and the rear of the vibration insertion is generally 30-50 cm, the vibration leakage is prevented, and the prepared concrete can be transported to a preset place for pouring by a concrete transport vehicle after the vibration of the concrete is finished;
in the above three embodiments, the silica fume pervious concrete with different formulations is combined by changing the adding amount of the silica fume, the natural zeolite powder and the slow-setting superplasticizer, and with the increase of the amount of the silica fume, the natural zeolite powder and the slow-setting superplasticizer, the viscosity of the silica fume pervious concrete with high pressure resistance is improved, and the bleeding property of the silica fume pervious concrete with high pressure resistance is greatly reduced, so that the concrete is difficult to be plastered, therefore, although the construction method of the silica fume pervious concrete with high pressure resistance is not significantly different from the traditional concrete, the final setting time of the silica fume pervious concrete with high pressure resistance needs to be paid attention to in the construction process to prevent the concrete from being solidified and being unusable.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. The high-pressure-resistance silica fume pervious concrete is characterized by comprising the following materials in parts by weight: 15-25 parts of silica fume, 140 parts of 120-140 parts of water, 735 parts of 364-735 parts of Portland cement, 25-75 parts of natural zeolite powder, 1.2-3 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 22-45 parts of pulverized fly ash and 5-20 parts of a plastic retaining agent.
2. The high-pressure-resistance silica fume pervious concrete as claimed in claim 1, characterized by comprising the following components in parts by weight: 15 parts of silica fume, 120 parts of water, 364 parts of Portland cement, 25 parts of natural zeolite powder, 1.2 parts of a retarding superplasticizer, 1428 parts of coarse aggregate, 22 parts of fine grinding fly ash and 5 parts of a plastic retaining agent.
3. The high-pressure-resistance silica fume pervious concrete as claimed in claim 1, characterized by comprising the following components in parts by weight: 19 parts of silica fume, 130 parts of water, 515 parts of portland cement, 50 parts of natural zeolite powder, 2 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 33 parts of ground fine fly ash and 13 parts of a plastic retaining agent.
4. The high-pressure-resistance silica fume pervious concrete as claimed in claim 1, characterized by comprising the following components in parts by weight: 25 parts of silica fume, 140 parts of water, 735 parts of portland cement, 75 parts of natural zeolite powder, 3 parts of a retarding high-efficiency water reducing agent, 1428 parts of coarse aggregate, 45 parts of ground fine fly ash and 20 parts of a plastic retaining agent.
5. The preparation method of the silica fume pervious concrete with high pressure resistance according to any one of claims 1 to 4, characterized by comprising the following specific steps:
s1, adding coarse aggregate into the stirring device, and then adding silica fume and natural zeolite powder for dry mixing until the mixture is uniform and has no obvious color difference;
s2, adding 75% of water, coarse aggregate, silica fume and natural zeolite powder, and stirring for 15-30 seconds to obtain a first stirring material;
s3, adding the remaining 25% of water, portland cement, a retarding superplasticizer, ground fly ash and a plasticity-maintaining agent, and stirring uniformly to obtain a second stirred material;
s4, unloading the mixed concrete into a pouring cabin for vibration until the concrete does not sink significantly any more and begins to spread;
and S5, continuously stirring the concrete in the concrete transportation process to prevent the concrete from solidifying.
6. The preparation method of the silica fume pervious concrete with high pressure resistance as claimed in claim 5, characterized in that: the silica fume is fully dry-mixed with the coarse aggregate and the natural zeolite powder before water is added.
7. The preparation method of the silica fume pervious concrete with high pressure resistance as claimed in claim 5, characterized in that: when the silica fume is used, materials are strictly forbidden to be thrown at high altitude, and the silica fume is prevented from flying.
8. The preparation method of the silica fume pervious concrete with high pressure resistance as claimed in claim 5, characterized in that: the time for each insertion vibration after the concrete is mixed is about 20-30 seconds, and the total vibration time is not suitable for too long.
9. The preparation method of the silica fume pervious concrete with high pressure resistance as claimed in claim 5, characterized in that: the strength grade of the portland cement is not lower than 52.5R.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115259798A (en) * | 2022-08-15 | 2022-11-01 | 当阳市中阳建材有限公司 | High-strength concrete and preparation process thereof |
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| CN106277998A (en) * | 2015-05-19 | 2017-01-04 | 湖南三恒建设园林工程有限公司 | A kind of permeable concrete and the construction method of concrete road surface thereof |
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2021
- 2021-03-25 CN CN202110317415.1A patent/CN112897957A/en active Pending
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| CN104030640A (en) * | 2014-06-25 | 2014-09-10 | 扬州大学 | Pervious concrete of recycled aggregate and preparation method thereof |
| CN106277998A (en) * | 2015-05-19 | 2017-01-04 | 湖南三恒建设园林工程有限公司 | A kind of permeable concrete and the construction method of concrete road surface thereof |
| CN110482921A (en) * | 2019-09-10 | 2019-11-22 | 中国水利水电第三工程局有限公司 | Pervious concrete |
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| CN115259798A (en) * | 2022-08-15 | 2022-11-01 | 当阳市中阳建材有限公司 | High-strength concrete and preparation process thereof |
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