CN110563429A - high-strength pervious concrete - Google Patents
high-strength pervious concrete Download PDFInfo
- Publication number
- CN110563429A CN110563429A CN201910889863.1A CN201910889863A CN110563429A CN 110563429 A CN110563429 A CN 110563429A CN 201910889863 A CN201910889863 A CN 201910889863A CN 110563429 A CN110563429 A CN 110563429A
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- Prior art keywords
- parts
- coarse aggregate
- concrete
- polyvinyl alcohol
- strength
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
-
- 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
- C04B28/18—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 mixtures of the silica-lime type
- C04B28/186—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 mixtures of the silica-lime type containing formed Ca-silicates before the final hardening step
-
- 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
-
- 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
Abstract
The invention relates to high-strength pervious concrete, which belongs to the technical field of concrete and comprises the following components in parts by weight: 300-400 parts of cement, 1000-1300 parts of modified coarse aggregate, 20-45 parts of admixture, 100-170 parts of mixing water, 3-10 parts of fiber and 1-10 parts of water reducing agent; the modification steps of the modified coarse aggregate are as follows: s1: soaking the coarse aggregate in 10-30% polyvinyl alcohol water solution for 10-20h, and then airing the coarse aggregate to be semi-dry; s2: and adhering silicon powder, polyvinyl alcohol powder and calcium oxide particles to the outside of the semi-dried coarse aggregate, and further airing the coarse aggregate. The invention has the effect of enhancing the strength of concrete.
Description
Technical Field
the invention relates to the technical field of concrete, in particular to high-strength pervious concrete.
Background
In the existing urbanization construction, the ground surface is gradually hardened and covered by water-blocking materials such as buildings, concrete and the like, and the ground pavement with a compact surface is not beneficial to relieving the noise pollution of the city and mainly comes from the noise generated by road traffic; the water cannot be drained in time in rainy days, so that water is accumulated on the road surface, the phenomena of 'floating and sliding', 'splashing', 'glare at night' and the like are generated in rainy days, and inconvenience is brought to the traveling of pedestrians and the traveling of vehicles; in addition, the waterproof pavement and surrounding urban buildings act together, and the 'heat island effect' of the city can be increased.
The prior Chinese patent with publication number CN105906246A discloses a pervious concrete and a terrace manufacturing process using the pervious concrete, wherein the pervious concrete comprises, by mass, 90-110 parts of stones, 18-22 parts of cement, 0.5-0.6 part of gelling agent and 5-8 parts of water.
The above prior art solutions have the following drawbacks: after the concrete is hardened, when the concrete is subjected to external force, substances for enhancing the strength of the cement are not arranged in the cement, the adhesive force between the cement and the stone is weak, and a large number of structural cracks appear in the concrete, so that the strength of the concrete is influenced.
Disclosure of Invention
The invention aims to provide high-strength pervious concrete for enhancing the strength of concrete.
The above object of the present invention is achieved by the following technical solutions:
The high-strength pervious concrete comprises the following components in parts by weight: 300-400 parts of cement, 1000-1300 parts of modified coarse aggregate, 20-45 parts of admixture, 100-170 parts of mixing water, 3-20 parts of fiber and 1-10 parts of water reducing agent;
The modification steps of the modified coarse aggregate are as follows:
S1: soaking the coarse aggregate in 10-30% polyvinyl alcohol water solution for 10-20h, and then airing the coarse aggregate to be semi-dry;
S2: and adhering a mixture of silicon powder, polyvinyl alcohol powder and calcium oxide particles to the outside of the semi-dried coarse aggregate, wherein 2-8 parts of silicon powder, 5-10 parts of polyvinyl alcohol powder and 2-8 parts of calcium oxide particles in the mixture of silicon powder, polyvinyl alcohol powder and calcium oxide particles, and then further airing the coarse aggregate.
By adopting the technical scheme, the polyvinyl alcohol has strong adhesive force between porous hydrophilic materials, and the cement and the modified coarse aggregate have fine pin holes and are hydrophilic materials, so that the joint strength of the interface between the cement and the coarse aggregate is higher.
After soaking, a layer of polyvinyl alcohol film is formed on the outer surface of the coarse aggregate, the polyethylene film has certain viscosity when being semi-dry, the polyvinyl alcohol powder and the silicon powder can be uniformly and firmly adhered to the outer part of the coarse aggregate, when the concrete is mixed, when the silicon powder, the polyvinyl alcohol powder and the calcium oxide are simultaneously contacted with mixing water, the calcium oxide reacts with the mixing water to release heat, so that the surrounding temperature is raised, the temperature of the mixing water around the calcium oxide is favorably raised, the polyvinyl alcohol powder can be dissolved in water at higher temperature, and after the heat released by the calcium oxide is quickly dissipated, the hydration heat temperature of the cement begins to rise, so that the polyvinyl alcohol powder can still be kept at higher temperature to be dissolvedThe dissolution time of the polyvinyl alcohol is prolonged, so that the polyvinyl alcohol can be well dissolved, the polyvinyl alcohol solution tightly bonds the cement and the coarse aggregate, so that the bonding effect between the cement and the coarse aggregate is enhanced, the strength of the concrete is improved, and meanwhile, SiO in the silicon powder particles2With Ca (OH) in cement2and Ca (OH) obtained by reaction of calcium oxide with water2Reacting to generate C-S-H gel, neutralizing Ca (OH)2Meanwhile, the produced product fills the coarse holes at the cement position close to the coarse aggregate, so that the structure of the cement is improved, and the strength and the corrosion resistance of the cement are improved; meanwhile, the coarse aggregate is modified, so that the polyvinyl alcohol can only strengthen the bonding of the interface of the coarse aggregate and the cement, but not the whole concrete is bonded by the polyvinyl alcohol, the water permeability of the concrete is ensured, the fibers mainly have the main functions of hindering the expansion of micro cracks in the concrete and retarding the generation and development of macro cracks, the concrete is subjected to the action of external force after being hardened, the cement and the fibers bear the external force together, and when the concrete cracks, the fibers crossing the cracks become main acceptors of the external force, so that the concrete is not easy to further crack, and the strength of the concrete is strengthened.
The invention is further configured to: the paint comprises the following components in parts by weight: 320-380 parts of cement, 1100-1200 parts of modified coarse aggregate, 30-40 parts of admixture, 120-150 parts of mixing water, 8-18 parts of fiber and 3-7 parts of water reducing agent.
The invention is further configured to: the fibers were treated in the same manner as the coarse aggregate.
Through adopting above-mentioned technical scheme, the fibre can bond together with cement or coarse aggregate, and the cohesion between fibre and the cement is strengthened to the anchoring effect of fibre to cement is strengthened, makes the wholeness of cement stronger.
The invention is further configured to: the fibers are steel fibers.
The invention is further configured to: the anti-wear agent also comprises 3-10 parts by weight of an anti-wear agent.
The invention is further configured to: the antiwear agent is carbon fiber.
By adopting the technical scheme, the strength of the concrete is further improved by adding the carbon fibers; meanwhile, the carbon fiber is lighter than metal aluminum in mass, but higher in strength than steel, has the characteristics of corrosion resistance and high modulus, is not easy to corrode, and has higher strength to increase the wear resistance of concrete.
The invention is further configured to: the admixture is fly ash, and the particle size of the fly ash is 1-2 mu m.
By adopting the technical scheme, when the fine fly ash is doped into the concrete, the fly ash enters gaps among cement ions, so that the compactness of the concrete is further improved; and the fly ash can convert calcium hydroxide which is unfavorable for the concrete into favorable C-S-H gel, namely, the glass-state active silicon oxide and aluminum oxide in the fly ash react with calcium hydroxide in cement to generate calcium silicate hydrate and calcium aluminate hydrate, so that gaps of the cement are filled, and the compactness of the concrete is improved.
The invention is further configured to: the water reducing agent is a polycarboxylic acid water reducing agent.
in conclusion, the beneficial technical effects of the invention are as follows:
1. The modified coarse aggregate is arranged, so that the bonding effect between cement and the coarse aggregate is enhanced, and the strength of concrete is improved;
2. The wear resistance of the concrete is improved by the antiwear agent.
Detailed Description
example 1
The high-strength pervious concrete comprises the following components in parts by weight: 345 parts of cement, 1125 parts of modified coarse aggregate, 32 parts of admixture, 136 parts of mixing water, 10 parts of fiber and 5 parts of water reducing agent, wherein the admixture is fly ash, the particle size of the fly ash is 1-2 mu m, the fiber is steel fiber, and the water reducing agent is polycarboxylic acid water reducing agent.
the modification steps of the modified coarse aggregate are as follows:
S1: soaking the coarse aggregate in 15% polyvinyl alcohol water solution for 12h, and then airing the coarse aggregate to be semi-dry;
s2: adhering a mixture of silicon powder, polyvinyl alcohol powder and calcium oxide particles to the outside of the semi-dried coarse aggregate, wherein 4 parts of silicon powder, 7 parts of polyvinyl alcohol powder and 3 parts of calcium oxide particles in the mixture of silicon powder, polyvinyl alcohol powder and calcium oxide particles, and further airing the coarse aggregate
the fibers were treated in the same manner as the coarse aggregate.
Example 2
The difference from example 1 is that:
the paint comprises the following components in parts by weight: 320 parts of cement, 1100 parts of modified coarse aggregate, 30 parts of admixture, 120 parts of mixing water, 8 parts of fiber and 3 parts of water reducing agent.
Example 3
The difference from example 1 is that:
The paint comprises the following components in parts by weight: 380 parts of cement, 1200 parts of modified coarse aggregate, 40 parts of admixture, 150 parts of mixing water, 18 parts of fiber and 7 parts of water reducing agent.
Example 4
The difference from example 1 is that: in S1, the coarse aggregate is soaked in a polyvinyl alcohol aqueous solution with the mass fraction of 10% for 20 hours.
Example 5
The difference from example 1 is that:
In S1, the coarse aggregate is soaked in 30 mass percent polyvinyl alcohol aqueous solution for 10 hours.
Example 6
The difference from example 1 is that:
The coating also comprises the following components in parts by weight: 3 parts of an antiwear agent, wherein the antiwear agent is carbon fiber.
example 7
The difference from example 1 is that:
The coating also comprises the following components in parts by weight: 7 parts of an antiwear agent, wherein the antiwear agent is carbon fiber.
Example 8
The difference from example 1 is that:
The coating also comprises the following components in parts by weight: 10 parts of an antiwear agent, wherein the antiwear agent is carbon fiber.
Example 9
The difference from example 1 is that:
8 parts of silicon powder, 5 parts of polyvinyl alcohol powder and 2 parts of calcium oxide particles.
Example 10
The difference from example 1 is that:
8 parts of silicon powder, 10 parts of polyvinyl alcohol powder and 2 parts of calcium oxide particles.
example 11
The difference from example 1 is that:
2 parts of silicon powder, 5 parts of polyvinyl alcohol powder and 8 parts of calcium oxide particles.
Example 12
The difference from example 1 is that:
2 parts of silicon powder, 10 parts of polyvinyl alcohol powder and 8 parts of calcium oxide particles.
comparative example 1
The difference from example 1 is that: the coarse aggregate and the fibers are unmodified.
Performance detection
the compressive strength of the concrete provided in examples 1-8 and comparative example 1 after hardening was tested with reference to "standard for testing mechanical Properties of ordinary concrete GB/T50081-2002", the greater the compressive strength, the stronger the compressive capacity, and the test results are shown in Table 1.
the water permeability coefficients of the hardened concrete provided by examples 1-8 and comparative example 1 were tested with reference to technical regulation CJJ135-2009 of pervious concrete pavement, and the larger the water permeability coefficient is, the better the water permeability of the concrete is, and the detection results are shown in table 1.
TABLE 1 test results of the properties of the hardened concrete
As can be seen from Table 1, the concrete of examples 1 to 8, which had a greater compressive strength at 7d and a greater compressive strength at 28d than the concrete of comparative example 1, demonstrated that the modification of the coarse aggregate and the fibers, which resulted in the reinforcing of the combination of the coarse aggregate and the fibers with the cement, enhanced the strength of the concrete; the concrete of examples 1 to 8 has a water permeability coefficient higher than that of the concrete of comparative example 1, and the modification of the coarse aggregate and the fiber strengthens the combination of the coarse aggregate and the fiber with the cement, enables good adhesion between the cement and between the cement and the coarse aggregate, prevents small cement particles from falling into the gaps of the concrete, prevents the gaps of the concrete from being easily blocked, and improves the water permeability of the concrete.
in examples 1-3, the concrete in example 1 has a greater 7d compressive strength, 28d compressive strength and water permeability coefficient than the concrete in examples 2 and 3, and the concrete in example 1 has a better strength and water permeability.
In examples 1 and 4-5, the compressive strength of 7d and the compressive strength of 28d in example 1 are both greater than those of the concrete in examples 4 and 5, which shows that under the soaking concentration and time of the polyvinyl alcohol in example 1, the polyvinyl alcohol better fills the pores on the surface of the coarse aggregate, so that the performance of the coarse aggregate is further improved, and the compressive strength of the concrete is improved; the water permeability coefficients of examples 1 and 4 to 5 were not greatly different, and the water permeability of the concrete was approximately similar within this modification condition range.
In examples 1 and 6 to 8, the concrete in example 1 has the compressive strength of 7d and the compressive strength of 28d smaller than those of the concrete in examples 6 to 8, which shows that the holidays of the anti-wear agent further increase the strength of the concrete, and the compressive strength of 7d and the compressive strength of 28d in example 7 are the largest, which shows that the strength of the concrete is increased more when the anti-wear agent is added in the ratio; the water permeability coefficient of the concrete in the embodiment 1 is smaller than that of the concrete in the embodiments 6-8, the cement is further anchored by adding the anti-wear agent, the connectivity between the cement is enhanced, so that the integrity of the cement is stronger, the cement can be limited in the concrete forming process, the anti-wear agent is better anchored and does not flow easily by gravity, a better gap can be kept in the concrete, and the permeability of the concrete is improved.
In examples 1 and 9-12, the concrete in example 1 has 7d compressive strength and 28d compressive strength which are higher than those of the concrete in examples 9-10, the strength of the concrete is reduced by reducing the amount of polyvinyl alcohol, the added polyvinyl alcohol is not enough to dissolve and has a bonding effect, and undissolved lumps exist to influence the bonding at the interface between cement and coarse aggregate, so that the strength of the concrete is also reduced; the water permeability coefficient of the concrete in example 1 is not much different from that of the concrete in examples 9 to 10; the concrete of example 1 has a greater 7d compressive strength and a greater 28d compressive strength than the concrete of examples 11 to 12, and the silica fume/calcium oxide particle ratio is increased, so that the C-S-H gel formed at the interface of the coarse aggregate is increased to cause excessive expansion of the concrete, resulting in internal cracks and increased water permeability coefficient of the concrete of examples 11 to 12.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a high strength pervious concrete which characterized in that: the paint comprises the following components in parts by weight: 300-400 parts of cement, 1000-1300 parts of modified coarse aggregate, 20-45 parts of admixture, 100-170 parts of mixing water, 3-10 parts of fiber and 1-10 parts of water reducing agent;
The modification steps of the modified coarse aggregate are as follows:
S1: soaking the coarse aggregate in 10-30% polyvinyl alcohol water solution for 10-20h, and then airing the coarse aggregate to be semi-dry;
s2: and adhering a mixture of silicon powder, polyvinyl alcohol powder and calcium oxide particles to the outside of the semi-dried coarse aggregate, wherein 2-8 parts of silicon powder, 5-10 parts of polyvinyl alcohol powder and 2-8 parts of calcium oxide particles in the mixture of silicon powder, polyvinyl alcohol powder and calcium oxide particles, and then further airing the coarse aggregate.
2. The high-strength pervious concrete according to claim 1, characterized in that: the paint comprises the following components in parts by weight: 320-380 parts of cement, 1100-1200 parts of modified coarse aggregate, 30-40 parts of admixture, 120-150 parts of mixing water, 8-18 parts of fiber and 3-7 parts of water reducing agent.
3. The high-strength pervious concrete according to claim 1, characterized in that: the fibers were treated in the same manner as the coarse aggregate.
4. The high-strength pervious concrete according to claim 1, characterized in that: the fibers are steel fibers.
5. the high-strength pervious concrete according to claim 1, characterized in that: the anti-wear agent also comprises 3-10 parts by weight of an anti-wear agent.
6. the high-strength pervious concrete according to claim 5, wherein: the antiwear agent is carbon fiber.
7. The high-strength pervious concrete according to claim 1, characterized in that: the admixture is fly ash, and the particle size of the fly ash is 1-2 mu m.
8. The high-strength pervious concrete according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid water reducing agent.
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| CN201910889863.1A CN110563429B (en) | 2019-09-20 | 2019-09-20 | High-strength pervious concrete |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112159177A (en) * | 2020-09-30 | 2021-01-01 | 上海顺多防水工程有限公司 | High-strength pervious concrete and preparation method thereof |
| CN113213842A (en) * | 2021-05-11 | 2021-08-06 | 罗成向 | High-durability pervious concrete and production process thereof |
| CN113354369A (en) * | 2021-07-23 | 2021-09-07 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
| CN114455875A (en) * | 2022-03-18 | 2022-05-10 | 河南人邦科技股份有限公司 | Modified polyurethane aggregate and cement-based lightweight concrete board prepared from same |
| CN114620994A (en) * | 2022-04-24 | 2022-06-14 | 醴陵千汇实业有限公司 | Solid waste clay and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113354369A (en) * | 2021-07-23 | 2021-09-07 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
| CN113354369B (en) * | 2021-07-23 | 2022-07-12 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
| CN114455875A (en) * | 2022-03-18 | 2022-05-10 | 河南人邦科技股份有限公司 | Modified polyurethane aggregate and cement-based lightweight concrete board prepared from same |
| CN114620994A (en) * | 2022-04-24 | 2022-06-14 | 醴陵千汇实业有限公司 | Solid waste clay and preparation method thereof |
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