Fiber-reinforced recycled aggregate pervious concrete

A technology of permeable concrete and recycled aggregate, applied in the field of fiber-reinforced recycled aggregate permeable concrete, can solve the problems of inability to achieve cost saving, lack of lightening, poor flexural strength and toughness, etc.

Pending Publication Date: 2022-07-29
CHENGBANG ECO ENVIRONMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Permeable concrete is mainly suitable for ground and road pavement. It has multiple functions such as drainage, water retention, ventilation, noise reduction, and friction increase. It is one of the basic materials for the construction and operation and maintenance of "sponge cities". It is made of recycled aggregates. Concrete, to further reduce the carbon emissions in the whole life cycle of ground and pavement pavement materials, and effectively utilize construction waste and solid waste at the same time, while the existi

Method used

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  • Fiber-reinforced recycled aggregate pervious concrete
  • Fiber-reinforced recycled aggregate pervious concrete
  • Fiber-reinforced recycled aggregate pervious concrete

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Experimental program
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Effect test

Embodiment 1

[0059] Advantageously, the cement adopts slag Portland cement, its area is 476m2 / kg, and the 3d and 28d compressive strengths are 29.7MPa and 47.4MPa, respectively.

[0060] Beneficially, the recycled aggregate is obtained by in-situ recycling and processing in a ready-mixed concrete plant, and the recycled concrete has a design strength grade of C25-C40, and the coarse and fine aggregates are limestone crushed stone and machine-made sand, respectively.

[0061] Beneficially, the nominal particle size range of the recycled aggregate is 10-15mm, the mass water absorption rate is 3.9%, and other performance indicators of the recycled aggregate conform to the current industry standard CJJ / T 253 "Technical Specifications for the Application of Recycled Aggregate Pervious Concrete". relevant regulations.

[0062] Beneficially, the polymer emulsion uses methyl methacrylate as the monomer and has a density of 0.98 g / cm 3 , the solid content is 46%.

[0063] Advantageously, the main c...

Embodiment 2

[0070] Beneficially, the cement is P·O42.5 ordinary Portland cement of the national standard GB 175 "General Portland Cement".

[0071] Beneficially, the regenerated aggregate has a nominal particle size range of 10-15 mm, and a mass water absorption rate of 3.9%.

[0072] Other performance indicators of recycled aggregate conform to the relevant provisions of the current industry standard CJJ / T 253 "Technical Specifications for the Application of Recycled Aggregate Pervious Concrete"

[0073] Beneficially, wherein the apparent density of the primary aggregate is 2.51 g / cm 3 , the void ratio is 44.5%, the crush value index is 2.5, and the mud content is 0.52%.

[0074] Beneficially, wherein the cement 324kg / m 3 , water 126kg / m 3 , coarse aggregate 1498kg / m 3 , of which recycled aggregate accounts for 65%, and fine aggregate is 116kg / m 3 , copper-plated steel fiber 2.35kg / m 3 , silica fume 18kg / m 3 , fly ash 36kg / m 3 , high performance admixture 3.24kg / m 3 .

[0075] ...

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Abstract

The invention discloses fiber-reinforced recycled aggregate pervious concrete, which is prepared by adopting the following formula: 270-350 kg/m < 3 > of cement, 355-450 kg/m < 3 > of water, 1360-1950 kg/m < 3 > of coarse aggregate, 35-100% of recycled aggregate, 0-30 kg/m < 3 > of polymer emulsion, 0-9.6 kg/m < 3 > of water reducing agent, 0-5 kg/m < 3 > of high-performance admixture, a water-binder ratio of 0.24-0.42, a slurry-bone ratio of 1: 3.8-1: 4.7, the maximum nominal particle size of the coarse aggregate is 5-20 mm, the maximum nominal particle size of the recycled aggregate is 5-20 mm, and the maximum nominal particle size of the recycled aggregate is 5-20 mm. The pervious concrete is prepared from the recycled aggregate, carbon emission in the whole life cycle of ground and pavement paving materials is further reduced, meanwhile, construction waste and solid waste are effectively utilized, the breaking strength and toughness of a pervious paving layer are greatly improved through the fiber reinforcement technology, a premixing mode is adopted for production in a breakthrough mode, the production efficiency is greatly improved, and the production cost is reduced. And the quality stability of a pervious concrete product is ensured to a greater extent.

Description

technical field [0001] The invention relates to the technical field of green and low-carbon environment-friendly building materials, in particular to a fiber-reinforced recycled aggregate permeable concrete. Background technique [0002] Pervious concrete, also known as permeable concrete, permeable concrete, sand-free macroporous concrete (previousconcrete or porous concrete or no-fines concrete), is a kind of concrete that does not contain or contains less fine aggregate and has a high connected porosity ( 15%-30%), larger nominal aperture (2-8mm), and special concrete with a water permeability coefficient of 2-6mm / s. Three basic principles should be followed in the preparation of pervious concrete: coarse aggregate with a narrow particle size range, no or very little fine aggregate, a controlled amount of slurry and usually a low water glue ratio. [0003] According to the main raw materials, pervious concrete can be divided into eight varieties. According to the type of...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2111/00284C04B18/08C04B18/167C04B24/283C04B14/02C04B2103/302C04B16/0633C04B18/146C04B14/48C04B2103/0054
Inventor 张兴桥徐美贞陈琪应建栋李国太杜居磊
Owner CHENGBANG ECO ENVIRONMENT CO LTD
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