CN113233808A - Activation method of regenerated micro powder - Google Patents

Activation method of regenerated micro powder Download PDF

Info

Publication number
CN113233808A
CN113233808A CN202110587801.2A CN202110587801A CN113233808A CN 113233808 A CN113233808 A CN 113233808A CN 202110587801 A CN202110587801 A CN 202110587801A CN 113233808 A CN113233808 A CN 113233808A
Authority
CN
China
Prior art keywords
regenerated
powder
micro powder
regenerated micro
waste
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110587801.2A
Other languages
Chinese (zh)
Inventor
郑朝灿
刘智武
李晓珍
楼聪
唐晶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jinhua Polytechnic
Original Assignee
Jinhua Polytechnic
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jinhua Polytechnic filed Critical Jinhua Polytechnic
Priority to CN202110587801.2A priority Critical patent/CN113233808A/en
Publication of CN113233808A publication Critical patent/CN113233808A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • C04B20/02—Treatment
    • C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
    • 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
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a method for activating regenerated micro powder, which comprises the following steps: (1) selecting materials: selecting waste concrete and waste baked bricks recycled in a construction site as raw materials of the recycled micro powder, wherein the waste concrete and the waste baked bricks are processed in a separate processing mode; (2) creating an isolation area: selecting a construction area, erecting an isolation plate to seal the construction area, and installing a dust removal facility to build a construction environment; (3) primary crushing: primarily crushing the regenerated micro-powder raw material by a universal crusher; (4) screening: and screening the crushed regenerated micro powder raw material, separating small fragments with the diameter of less than 40mm, and taking powder with the diameter of less than 0.16mm as initial regenerated micro powder. The invention can collect the regenerated micro powder to the maximum extent, not only prevents the regenerated micro powder from diffusing in the air to form haze to pollute the atmosphere, but also realizes reutilization, can activate the regenerated micro powder through the exciting agent, can be prepared into regenerated micro powder concrete and cement stone, solves the problem of effective comprehensive utilization of building waste, and relieves environmental hazard.

Description

Activation method of regenerated micro powder
Technical Field
The invention relates to the technical field of solid waste recycling, in particular to a method for activating regenerated micro powder.
Background
At present, the construction waste is mainly buried and dumped, which not only occupies land and pollutes environment, but also wastes resources. How to treat the huge amount of construction waste is a key problem for promoting energy conservation and emission reduction and sustainable development of construction industry, and is also a serious challenge facing all countries in the world. The resource utilization of solid waste is an important strategic requirement of national energy conservation, environmental protection and economic sustainable development. The construction waste mainly comprises waste concrete, clay bricks and other blocky raw materials;
at present, the technology for preparing recycled coarse aggregate concrete by using construction waste is relatively mature, but in the process of preparing recycled aggregate, powder (namely recycled micro powder) with the diameter smaller than 0.16mm and accounting for about 15% of the mass of raw materials is inevitably generated, the recycled micro powder of the construction waste mainly comprises concrete micro powder (RCP) and brick micro powder (RBP), and the recycled micro powder is fine in particle, so that secondary pollution is caused by easy floating in the atmosphere, and the haze hazard of a region is aggravated. Therefore, the part of the regenerated micro powder is activated to prepare the regenerated micro powder concrete and the cement stone, so that the problems of effective comprehensive utilization of construction waste and alleviation of environmental hazards are solved and the problem of urgent need is solved.
Disclosure of Invention
The invention aims to provide a method for activating regenerated micro-powder, which at least solves the problem of how to activate and recycle the generated regenerated micro-powder in the process of recycling construction waste in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for activating regenerated micropowder comprises the following steps:
(1) selecting materials: selecting waste concrete and waste baked bricks recycled in a construction site as raw materials of the recycled micro powder, wherein the waste concrete and the waste baked bricks are processed in a separate processing mode;
(2) creating an isolation area: selecting a construction area, erecting an isolation plate to seal the construction area, and installing a dust removal facility to build a construction environment;
(3) primary crushing: primarily crushing the regenerated micro-powder raw material by a universal crusher;
(4) screening: screening the crushed regenerated micro powder raw material, separating small fragments with the diameter of less than 40mm, and taking powder with the diameter of less than 0.16mm as initial regenerated micro powder;
(5) and (3) secondary crushing: continuously crushing the small fragment regenerated micro-powder raw material with the diameter of less than 40mm by using a jaw crusher, screening out initial regenerated micro-powder with the diameter of less than 0.16mm by the step (4), and taking the initial regenerated micro-powder with the diameter of more than 0.16mm as a regenerated bone material;
(6) ball milling: ball-milling the initial regenerated micro powder for 1-2h by using a ball mill to obtain regenerated micro powder, and analyzing;
(7) and (3) activation: adding an alkaline activator into the regenerated micro powder, wherein the adding amount is 0-5%, and stirring and mixing to improve the activity of the regenerated micro powder.
Preferably, the strength of the concrete is measured by a universal pressure tester, and the concrete block with the strength grade of more than C25 and the age of more than one year is selected.
Preferably, the isolation plate is a color steel plate.
Preferably, the dust removing facility adopts a dust collector to absorb dust raised in the working steps (3), (4) and (5), and particulate matters in the dust are separated out to be used as initial regenerated micro powder.
Preferably, the particle size distribution of the regenerated fine powder is measured by a laser particle size analyzer to determine a main component in the regenerated fine powder.
Preferably, the alkali activator is Na2SO4、NaOH2、CaOH2Or NaHCO3One of (1) and (b).
The method for activating the regenerated micro powder has the beneficial effects that:
in the process of recycling construction waste, raised dust can be recycled through closing a construction site, regenerated micro powder in the dust is collected, the environment is protected, the activator is doped into the regenerated micro powder, the regeneration can be promoted and activated, the compressive strength and the flexural strength of regenerated micro powder concrete are improved, and the utilization value of the regenerated micro powder is improved.
Drawings
FIG. 1 is a schematic diagram of the preparation of the regenerated micropowder of the present invention;
FIG. 2 is a graph of the ball milling time and compressive strength of C20 recycled micro-powder concrete;
FIG. 3 is a graph showing the relationship between the ball milling time and the compressive strength of C30 recycled micro-powder concrete;
FIG. 4 is a graph showing the relationship between the addition amount of the C50 regenerated micro-powder concrete activator and the flexural strength;
FIG. 5 is a graph showing the relationship between the addition amount of the C50 regenerated micro-powder concrete exciting agent and the compressive strength.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution:
example 1: a method for activating regenerated micropowder comprises the following steps:
(1) selecting materials: selecting waste concrete and waste baked bricks recycled in a construction site as raw materials of the recycled micro powder, wherein the waste concrete and the waste baked bricks are processed in a separate processing mode;
measuring the strength of the concrete by a universal pressure tester, and selecting concrete blocks with the strength grade of more than C25 and the age of more than one year;
(2) creating an isolation area: selecting a construction area, erecting an isolation plate to seal the construction area, installing a dust removal facility to build a construction environment, selecting a color steel plate as the isolation plate, having strong corrosion resistance and ageing resistance, being more beneficial to long-term use, and preventing raised dust from diffusing into the atmosphere to form haze;
(3) primary crushing: primarily crushing the regenerated micro-powder raw material by a universal crusher;
(4) screening: screening the crushed regenerated micro powder raw material, separating small fragments with the diameter of less than 40mm, and taking powder with the diameter of less than 0.16mm as initial regenerated micro powder;
(5) and (3) secondary crushing: continuously crushing the small fragment regenerated micro-powder raw material with the diameter of less than 40mm by using a jaw crusher, screening out initial regenerated micro-powder with the diameter of less than 0.16mm by the step (4), and taking the initial regenerated micro-powder with the diameter of more than 0.16mm as a regenerated bone material;
(6) the dust removing facility adopts a dust collector to absorb the dust raised in the working steps (3), (4) and (5), the particulate matters in the dust are separated out to be used as initial regenerated micro-powder, the dust collector can purify the dust, protect the atmospheric environment, and collect the dust to be recycled as the regenerated micro-powder;
(7) ball milling: ball milling the initial regenerated micro powder for 1h by using a ball mill to obtain regenerated micro powder, determining the particle size distribution of the regenerated micro powder by using a laser particle size analyzer, determining main components in the regenerated micro powder, avoiding the phenomenon that the content of a certain particle size in regenerated micro powder particles is too high and the particle grading distribution becomes poor due to over-long time ball milling, and preventing the reduction of the 'close packing' effect of the particles in concrete;
(8) and (3) activation: adding 3% of alkaline activator into the regenerated micro powder, stirring and mixing to improve the activity of the regenerated micro powder, comprehensively considering the economic efficiency and the excitation effect on the activity of the regenerated micro powder, and adding NaOH2The mixing amount is 3 percent optimally.
Preferably, the alkali activator is NaOH2NaOH is used for recycling construction waste2The activity of the activated waste concrete recycled micro powder and the waste baked brick recycled micro powder is better.
Example 2: a method for activating regenerated micropowder comprises the following steps:
(1) selecting materials: selecting waste concrete and waste baked bricks recycled in a construction site as raw materials of the recycled micro powder, wherein the waste concrete and the waste baked bricks are processed in a separate processing mode;
measuring the strength of the concrete by a universal pressure tester, and selecting concrete blocks with the strength grade of more than C25 and the age of more than one year;
(2) creating an isolation area: selecting a construction area, erecting an isolation plate to seal the construction area, installing a dust removal facility to build a construction environment, selecting a color steel plate as the isolation plate, having strong corrosion resistance and ageing resistance, being more beneficial to long-term use, and preventing raised dust from diffusing into the atmosphere to form haze;
(3) primary crushing: primarily crushing the regenerated micro-powder raw material by a universal crusher;
(4) screening: screening the crushed regenerated micro powder raw material, separating small fragments with the diameter of less than 40mm, and taking powder with the diameter of less than 0.16mm as initial regenerated micro powder;
(5) and (3) secondary crushing: continuously crushing the small fragment regenerated micro-powder raw material with the diameter of less than 40mm by using a jaw crusher, screening out initial regenerated micro-powder with the diameter of less than 0.16mm by the step (4), and taking the initial regenerated micro-powder with the diameter of more than 0.16mm as a regenerated bone material;
(6) the dust removing facility adopts a dust collector to absorb the dust raised in the working steps (3), (4) and (5), the particulate matters in the dust are separated out to be used as initial regenerated micro-powder, the dust collector can purify the dust, protect the atmospheric environment, and collect the dust to be recycled as the regenerated micro-powder;
(7) ball milling: ball milling the initial regenerated micro powder for 1h by using a ball mill to obtain regenerated micro powder, determining the particle size distribution of the regenerated micro powder by using a laser particle size analyzer, determining main components in the regenerated micro powder, avoiding the phenomenon that the content of a certain particle size in regenerated micro powder particles is too high and the particle grading distribution becomes poor due to over-long time ball milling, and preventing the reduction of the 'close packing' effect of the particles in concrete;
(8) and (3) activation: adding alkaline activator into the regenerated micro powder with the addition amount of 5%, stirring and mixing to improve the activity of the regenerated micro powder, and adding NaOH2 ofWhen the mixing amount is 5%, the flexural strength and compressive strength of the concrete are the highestAnd the building block is good and can meet high-standard building quality.
Preferably, the alkali activator is NaOH2NaOH is used for recycling construction waste2The activity of the activated waste concrete regenerated micro powder and the waste baked brick regenerated micro powder is better。
The concrete is taken as a reference object, the recycled micro-powder concrete with the strength of C20 and C30 is prepared according to the ball milling time of the recycled micro-powder, the compressive strength of the recycled micro-powder concrete for 7 days (d), 14 days (d) and 28 days (d) is respectively tested, and as can be seen with reference to the attached drawings 2, 3 and 4 in the specification, when the ball milling time is 2 hours, the strength of the recycled micro-powder concrete is reduced, and the ball milling time of the recycled micro-powder is controlled to be about 1 hour, so that the recycled micro-powder reaches the optimal state;
taking the regenerated micropowder concrete with the strength of C50 as an example, NaOH2As an alkaline excitant, different amounts of excitant are added, the flexural strength and compressive strength of the regenerated micropowder concrete added with the excitant are measured, and referring to the attached figures 4 and 5 in the specification, the economic efficiency and the excitation effect on the activity of the regenerated micropowder are comprehensively considered, so that NaOH can be determined2The optimum mixing amount of the alkaline excitant is 3 percent, and the building strength and NaOH are considered only2The optimum mixing amount of the alkaline activator is 5 percent.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The method for activating the regenerated micro powder is characterized by comprising the following steps:
(1) selecting materials: selecting waste concrete and waste baked bricks recycled in a construction site as raw materials of the recycled micro powder, wherein the waste concrete and the waste baked bricks are processed in a separate processing mode;
(2) creating an isolation area: selecting a construction area, erecting an isolation plate to seal the construction area, and installing a dust removal facility to build a construction environment;
(3) primary crushing: primarily crushing the regenerated micro-powder raw material by a universal crusher;
(4) screening: screening the crushed regenerated micro powder raw material, separating small fragments with the diameter of less than 40mm, and taking powder with the diameter of less than 0.16mm as initial regenerated micro powder;
(5) and (3) secondary crushing: continuously crushing the small fragment regenerated micro-powder raw material with the diameter of less than 40mm by using a jaw crusher, screening out initial regenerated micro-powder with the diameter of less than 0.16mm by the step (4), and taking the initial regenerated micro-powder with the diameter of more than 0.16mm as a regenerated bone material;
(6) ball milling: ball-milling the initial regenerated micro powder for 1-2h by using a ball mill to obtain regenerated micro powder, and analyzing;
(7) and (3) activation: adding an alkaline activator into the regenerated micro powder, wherein the adding amount is 0-5%, and stirring and mixing to improve the activity of the regenerated micro powder.
2. The method for activating regenerated micropowder according to claim 1, characterized in that: the concrete strength is measured by a universal pressure tester, and concrete blocks with the strength grade of more than C25 and the age of more than one year are selected.
3. The method for activating regenerated micropowder according to claim 1, characterized in that: the isolation plate is made of a color steel plate.
4. The method for activating regenerated micropowder according to claim 1, characterized in that: and (3) absorbing the dust raised in the working steps (3), (4) and (5) by adopting a dust collector, and separating out the particulate matters in the dust to be used as initial regenerated micro powder.
5. The method for activating regenerated micropowder according to claim 1, characterized in that: the particle size distribution of the regenerated micro powder is measured by the laser particle size analyzer, and the main components in the regenerated micro powder are determined.
6. The method for activating regenerated micropowder according to claim 1, characterized in that: the alkali activator is Na2SO4、NaOH2、CaOH2Or NaHCO3One of (1) and (b).
CN202110587801.2A 2021-05-27 2021-05-27 Activation method of regenerated micro powder Pending CN113233808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110587801.2A CN113233808A (en) 2021-05-27 2021-05-27 Activation method of regenerated micro powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110587801.2A CN113233808A (en) 2021-05-27 2021-05-27 Activation method of regenerated micro powder

Publications (1)

Publication Number Publication Date
CN113233808A true CN113233808A (en) 2021-08-10

Family

ID=77139332

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110587801.2A Pending CN113233808A (en) 2021-05-27 2021-05-27 Activation method of regenerated micro powder

Country Status (1)

Country Link
CN (1) CN113233808A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113788638A (en) * 2021-10-11 2021-12-14 台州学院 High-activity regenerated micro powder and preparation method thereof
CN115650617A (en) * 2022-08-26 2023-01-31 台州学院 Preparation method for improving activity of regenerated micro-powder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2012959B1 (en) * 2014-06-06 2016-06-27 Ascem B V Cement composition, and method for manufacturing thereof.
CN106242327A (en) * 2016-07-21 2016-12-21 武汉源锦商品混凝土有限公司 Regenerated micropowder cement admixture and preparation method thereof
CN111087187A (en) * 2019-12-17 2020-05-01 深圳市恒星建材有限公司 Concrete regenerated micro powder and preparation method thereof
CN112479674A (en) * 2020-11-23 2021-03-12 湖南大学 Alkali-activated recycled red brick micro powder and slag-based recycled concrete and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2012959B1 (en) * 2014-06-06 2016-06-27 Ascem B V Cement composition, and method for manufacturing thereof.
CN106242327A (en) * 2016-07-21 2016-12-21 武汉源锦商品混凝土有限公司 Regenerated micropowder cement admixture and preparation method thereof
CN111087187A (en) * 2019-12-17 2020-05-01 深圳市恒星建材有限公司 Concrete regenerated micro powder and preparation method thereof
CN112479674A (en) * 2020-11-23 2021-03-12 湖南大学 Alkali-activated recycled red brick micro powder and slag-based recycled concrete and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
马纯滔等: "建筑垃圾再生微粉利用的试验研究", 《宁夏工程技术》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113788638A (en) * 2021-10-11 2021-12-14 台州学院 High-activity regenerated micro powder and preparation method thereof
CN115650617A (en) * 2022-08-26 2023-01-31 台州学院 Preparation method for improving activity of regenerated micro-powder

Similar Documents

Publication Publication Date Title
CN110357473A (en) Carbonized reinforced recycled aggregate and preparation method and application thereof
Canakci et al. Stabilization of clay with waste soda lime glass powder
CN101774223B (en) Method for preparing recycled aggregate concrete from steel fiber rubber and slag
CN102432207A (en) Construction regenerated binding material prepared from construction garbage and preparation method thereof
CN113233808A (en) Activation method of regenerated micro powder
CN108863131B (en) Preparation method of recycled aggregate enhancer based on waste clay brick powder
CN103787602A (en) Superfine regeneration powder compound geopolymer cementing material
Yeo et al. An overview on the properties of eco-friendly concrete paving blocks incorporating selected waste materials as aggregate
CN109678378A (en) A kind of application of building waste treatment process and gained recycled aggregate
CN102745929A (en) Regenerated mineral admixture and application thereof
CN103664027A (en) Method for preparing coal mine paste filling aggregate by using urban building waste as raw material
CN106830792A (en) Concrete mixed with useless brick and regeneration coarse aggregate and preparation method thereof
CN115893879B (en) Preparation method of solid waste-based superfine special composite cementing material and cementing material
CN113149536A (en) Regenerated micropowder concrete and preparation method thereof
CN112390583A (en) Solid waste cementing material for building 3D printing and preparation method and application thereof
CN104446071A (en) Dry sand making process
KR101544494B1 (en) Manufacturing method of recycled aggregate improved water absorption by coating alkali-activated binder
CN106167378A (en) A kind of gangue building waste is non-burning brick and preparation method thereof
CN111747710A (en) Sound insulation mortar with construction waste recycled fine aggregate and industrial waste
CN110204276A (en) A kind of radiation protection air entrained concrete containing Pb-Zn tailings
CN113501695A (en) Non-shrinkage ultrahigh-strength regenerated grouting material and preparation method thereof
CN103183489A (en) Environmentally-friendly green concrete
CN115849824B (en) Electric furnace nickel slag carbon fixation and high-value utilization method thereof in concrete
CN106145883A (en) A kind of slag building waste is non-burning brick and preparation method thereof
NL2028676B1 (en) Preparation method of magnesium phosphate cement (MPC) modified recycled coarse aggregates (RCA), obtained modified RCA and application of MPC modified RCA

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210810