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Environment-friendly recycled concrete and preparation method thereof

A recycled concrete, environmentally friendly technology, applied in the field of building materials, can solve the problems of poor compressive strength, flexural strength, affecting the mechanical properties and durability of concrete, and high porosity, so as to improve strength, enhance strength, and improve adhesion. Effect

Active Publication Date: 2019-01-29
曙光装配式建筑科技(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the natural aggregate, the recycled coarse aggregate in the above-mentioned patent is covered with hardened cement slurry on the surface of the recycled coarse aggregate, so the total content of new and old cement mortar in recycled concrete is higher than that of ordinary concrete, so its porosity is higher than that of natural concrete , Untreated recycled coarse aggregate will affect the mechanical properties and durability of concrete, resulting in poor compressive strength and flexural strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: a kind of environmental protection recycled concrete, its raw material comprises the component of following weight ratio:

[0046] Water 200kg / m 3 ;

[0047] Ordinary Portland cement 440kg / m 3 ;

[0048] Natural river sand 380kg / m 3 ;

[0049] Polycarboxylate superplasticizer 10kg / m 3 ;

[0050] Natural gravel 580kg / m 3 ;

[0051] Polyvinyl alcohol modified recycled coarse aggregate 650kg / m 3 ;

[0052] Micro silica fume 30kg / m 3 ;

[0053] The particle strength of natural river sand is less than 5mm, the particle size of natural gravel is 5-20mm, the mud content is 0.45%, and the crushing index is 9%.

[0054] The preparation method of polyvinyl alcohol modified recycled aggregate is as follows:

[0055] (1) Add carbon nanofibers to the polyvinyl alcohol aqueous solution whose mass concentration is 0.2, the mass ratio of carbon nanofibers and polyvinyl alcohol aqueous solution is 0.5:100, the average diameter of carbon nanofibers is 100nm, th...

Embodiment 2

[0062] Embodiment 2: A kind of environmental protection recycled concrete, the difference with embodiment 1 is that its raw material comprises the component of following weight ratio:

[0063] Water 205kg / m 3 ;

[0064] Ordinary Portland cement 445kg / m 3 ;

[0065] Natural river sand 385kg / m 3 ;

[0066] Polycarboxylate superplasticizer 11g / m 3 ;

[0067] Natural gravel 585g / m 3 ;

[0068] Polyvinyl alcohol modified recycled coarse aggregate 630g / m 3 ;

[0069] Micro silica fume 32g / m 3 .

Embodiment 3

[0070] Embodiment 3: A kind of environmental protection recycled concrete, the difference with embodiment 1 is that its raw material comprises the component of following weight ratio:

[0071] Water 210kg / m 3 ;

[0072] Ordinary Portland cement 450 / m 3 ;

[0073] Natural river sand 390 / m 3 ;

[0074] Polycarboxylate superplasticizer 13g / m 3 ;

[0075] Natural gravel 590 / m 3 ;

[0076] Polyvinyl alcohol modified recycled coarse aggregate 620g / m 3 ;

[0077] Micro silica fume 35kg / m 3 .

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Abstract

The invention discloses environment-friendly recycled concrete and a preparation method thereof, and relates to the field of building materials. Raw materials of the environment-friendly recycled concrete comprise the following components in parts by weight: 200-220 kg / m<3> of water, 440-460 kg / m<3> of ordinary Portland cement, 380-400 kg / m<3> of natural river sand, 10-15 kg / m<3> of a polycarboxylate water reducer, 580-600 kg / m<3> of natural gravel, 600-650 kg / m<3> of polyvinyl alcohol modified recycled coarse aggregates and 30-40 kg / m<3> of silica fume. The preparation method has the advantages of improving compressive strength and bending strength, waste concrete and waste polypropylene fibers can be recycled, pollution is reduced, and the recycled concrete is green and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to an environmentally friendly recycled concrete and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry, the pace of urbanization is getting faster and faster, and at the same time, there are more and more old city renovation projects, which have resulted in a large amount of abandoned construction waste. Most of the construction waste in our country has not been recycled in a scientific way. The vast majority of construction waste is disposed of as garbage, randomly piled in the open air, or disposed of in a simple landfill. [0003] A Chinese invention patent with publication number CN107010896A discloses a recycled concrete mixed with chopped basalt fiber and recycled coarse aggregate, which is made of the following raw materials in parts by weight: 100-300 parts of water, ordinary portla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/10C04B18/16
CPCC04B18/16C04B20/1055C04B28/04C04B2201/50C04B22/002C04B14/068C04B24/24C04B14/02C04B18/146C04B20/1033Y02W30/91
Inventor 林仁辉梁潇
Owner 曙光装配式建筑科技(浙江)有限公司
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