阅读说明：本技术 一种高强度透水混凝土 (high-strength pervious concrete ) 是由 谢佼 于 2019-09-20 设计创作，主要内容包括：本发明涉及一种高强度透水混凝土,属于混凝土的技术领域,按重量份计,包括有以下组分：水泥300-400份、改性粗骨料1000-1300份、掺合料20-45份、拌合水100-170份、纤维3-10份,减水剂1-10份；改性粗骨料的改性步骤为：S1：用质量分数为10-30%聚乙烯醇水溶液浸泡粗骨料10-20h,然后将粗骨料晾至半干；S2：在晾至半干的粗骨料的外部粘上硅粉、聚乙烯醇粉末以及氧化钙颗粒,然后进一步将粗骨料晾干。本发明具有增强混凝土强度的效果。(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.)

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.

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