Unlock instant, AI-driven research and patent intelligence for your innovation.

Recycled concrete based on lime-fly ash gravel base old material and preparation method thereof

A technology for recycling concrete and limestone crushed stone, applied in cement production and other directions, can solve problems such as environmental pollution, recycled aggregate, advanced utilization of powder, etc., to save natural resources, delay setting time, improve fluidity and workability Effect

Pending Publication Date: 2020-09-25
SOUTHEAST UNIV
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The old materials for demolition of lime-fly ash and gravel are mainly produced in the process of highway reconstruction and overhaul. For the old materials of demolition of lime-fly ash and gravel, the traditional treatment method is mainly to discard them directly to landfill. This method not only requires landfill, but also requires environmental pollution
At present, the recycling method of waste fly ash gravel is still at the low-level utilization level, and the old materials will be demolished for general backfilling projects, etc., and the advanced utilization of recycled aggregate and powder has not yet been carried out.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Recycled concrete based on lime-fly ash gravel base old material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 , mix the raw materials according to the following steps:

[0029] (1) Weigh 0.6 part of sodium hydroxide solid, add 1 part of water, stir while adding, and stir for 2 minutes to obtain sodium hydroxide solution, cool and set aside;

[0030] (2) Sieve the regenerated coarse aggregate of the old material of the lime-fly ash gravel and the recycled fine aggregate of the old material of the lime-fly ash gravel, and synthesize the required gradation;

[0031] (3) Weigh 5.5 parts of fly ash crushed stone old material regenerated powder, 5.5 parts of fly ash, 47.5 parts of fly ash crushed stone old material recycled coarse aggregate, 25.7 parts of fly ash crushed stone old material recycled fine aggregate, and then Put it into the mixing container and stir for 20s;

[0032] (4) Weigh 0.25 parts of sodium phosphate and dissolve it in the sodium hydroxide solution obtained in step (1), add it to the dry mix obtained in step (2), and add 2.1 parts of sodium si...

Embodiment 2

[0036] Mix the raw materials according to the following steps:

[0037] (1) Weigh 0.8 parts of sodium hydroxide solid, add 1.3 parts of water, stir while adding, and stir for 2.5 minutes to obtain sodium hydroxide solution, cool and set aside;

[0038] (2) Sieve the regenerated coarse aggregate of the old material of the lime-fly ash gravel and the recycled fine aggregate of the old material of the lime-fly ash gravel, and synthesize the required gradation;

[0039] (3) Weigh 6.0 parts of fly ash crushed stone old material regenerated powder, 6.0 parts of fly ash, 50.5 parts of fly ash crushed stone old material recycled coarse aggregate, 28.5 parts of fly ash crushed stone old material recycled fine aggregate, and then Put it into the stirring container and stir for 25s;

[0040] (4) Weigh 0.27 parts of sodium phosphate and dissolve it in the sodium hydroxide solution obtained in step (1), add it to the dry mix obtained in step (2), and add 2.6 parts of sodium silicate, stir...

Embodiment 3

[0044] Mix the raw materials according to the following steps:

[0045] (1) Weigh 1.1 parts of sodium hydroxide solid, add 1.6 parts of water, stir while adding, stir for 3 minutes to obtain sodium hydroxide solution, cool and set aside;

[0046] (2) Sieve the regenerated coarse aggregate of the old material of the lime-fly ash gravel and the recycled fine aggregate of the old material of the lime-fly ash gravel, and synthesize the required gradation;

[0047] (3) Weigh 6.5 parts of fly ash crushed stone old material regenerated powder, 6.5 parts of fly ash, 56.4 parts of fly ash crushed stone old material recycled coarse aggregate, 31.4 parts of fly ash crushed stone old material recycled fine aggregate, and then Put it into the stirring container and stir for 30s;

[0048] (4) Weigh 0.3 parts of sodium phosphate and dissolve it in the sodium hydroxide solution obtained in step (1), add it to the dry mix obtained in step (2), and add 3.2 parts of sodium silicate, stir for 15...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Compressive strengthaaaaaaaaaa
Compressive strengthaaaaaaaaaa
Compressive strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses recycled concrete based on a lime-fly ash gravel base old material and a preparation method of the recycled concrete. The recycled concrete is prepared from the following raw materials in parts by weight: 47.5 to 56.4 parts of lime-fly ash gravel old material recycled coarse aggregate, 25.7 to 31.4 parts of lime-fly ash gravel old material recycled fine aggregate, 8.25 to 9.75 parts of lime-fly ash gravel old material recycled powder, 2.75 to 3.25 parts of fly ash, 0.6 to 1.1 parts of sodium hydroxide, 2.1 to 3.2 parts of sodium silicate, 0.25 to 0.3 part of sodium phosphate and 1 to 1.6 parts of water. The preparation method comprises the following steps of: weighing sodium hydroxide, adding water, and stirring to obtain a sodium hydroxide solution; screening the lime-fly ash gravel old material recycled coarse aggregate and fine aggregate; weighing required raw materials and stirring; dissolving sodium phosphate in a sodium hydroxide solution, adding the dry blend and sodium silicate, and stirring; pouring, moisturizing and maintaining. The lime-fly ash gravel regenerated powder is used as a main silicon-aluminum phase raw material of the geopolymer, so that the production cost of the geopolymer is greatly reduced, and a feasible path is provided for recycling of the regenerated powder after crushing and screening of the waste lime-fly ash gravel.

Description

technical field [0001] The invention relates to regenerated concrete and a preparation method thereof, in particular to a regenerated concrete based on old materials of fly ash gravel base and a preparation method thereof. Background technique [0002] Geopolymer is a new type of inorganic non-metallic cementitious material newly developed. Because of its characteristics of early strength and quick hardening, good durability, and the use of industrial solid waste as raw material, it is considered to be an ideal substitute material for cement. Under the action of alkali excitation, the silicon-oxygen bond and aluminum-oxygen bond in the silicon-aluminum raw material are broken-recombined and polymerized to form a three-dimensional network aluminosilicate gel material. Among the geopolymers of fly ash system, it is generally considered that low calcium fly ash is more suitable as a raw material for geopolymers. Ca 2+ The addition of the geopolymer has the following effects: ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B28/00C04B40/02
CPCC04B28/006C04B40/0254C04B2201/50C04B12/04C04B22/062C04B22/16C04B18/16C04B18/08C04B22/002Y02P40/10
Inventor 朱志铎康转转霍王文张杰张德恒赵文政姚凯王朋胡乐乐
Owner SOUTHEAST UNIV