CN103332881B - A kind of preparation method of high-quality Aggregate of recycled concrete - Google Patents

A kind of preparation method of high-quality Aggregate of recycled concrete Download PDF

Info

Publication number
CN103332881B
CN103332881B CN201310216136.1A CN201310216136A CN103332881B CN 103332881 B CN103332881 B CN 103332881B CN 201310216136 A CN201310216136 A CN 201310216136A CN 103332881 B CN103332881 B CN 103332881B
Authority
CN
China
Prior art keywords
aggregate
concrete
coarse
regeneration
quality
Prior art date
Application number
CN201310216136.1A
Other languages
Chinese (zh)
Other versions
CN103332881A (en
Inventor
冯庆革
朱惠英
李贞�
周维
李浩璇
卢凌寰
Original Assignee
广西大学
广西壮族自治区建筑科学研究设计院
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 广西大学, 广西壮族自治区建筑科学研究设计院 filed Critical 广西大学
Priority to CN201310216136.1A priority Critical patent/CN103332881B/en
Publication of CN103332881A publication Critical patent/CN103332881A/en
Application granted granted Critical
Publication of CN103332881B publication Critical patent/CN103332881B/en

Links

Classifications

    • Y02W30/95

Abstract

A kind of preparation method of high-quality Aggregate of recycled concrete, comprise discarded concrete sorting, hammering, one-level fragmentation, one-level screening, rod milling, secondary screening and cleaning step, again the aggregate after classification is mixed by required grating, obtain the regenerated coarse aggregate of different-grain diameter requirement.Adopt the present invention that the cyclic utilization rate of discarded concrete can be made close to 80%, achieve the recycling of urban building waste, decrease the secondary pollution of building waste to environment, save building waste landfill to appropriation of land amount, and facilitate the industrialized development of building waste comprehensive utilization to a certain extent.

Description

A kind of preparation method of high-quality Aggregate of recycled concrete

One, technical field

The present invention relates to the treatment process of the discarded concrete in a kind of building waste, be specifically related to be that main raw material is processed into a kind of preparation method that can configure the high quality recycled aggregates of the High Performance Recycled Aggregate Concrete of medium tenacity grade with discarded concrete.

Two, background technology

Building waste becomes the inevitable outcome of urbanization process, but accounts for municipal solid wastes larger proportion because of it, and processing mode is more rudimentary, causes great destruction to environment, and threatens the natural resources of worsening shortages.Therefore, actively push forward minimizing and the comprehensive utilization of resources of building waste, realizing the synchronous propelling coordinated development of economic benefit, ecological benefits and social benefit, is the emphasis direction of Sustainable Construction Industry.

Discarded concrete in building waste is the key object of recycling, regeneration aggregate is its product, but regeneration aggregate surface adhesion the mortar of inequality, cause regeneration aggregate indices unstable, impact configure concrete intensity, shrink, creep and weather resistance etc., therefore, how the mortar adhering to primary aggregate surface is effectively departed from, obtain the key difficulties that cleaner aggregate is whole technology.

The major technique of current production regeneration aggregate is that repeatedly broken, screening obtains appropriate particle size aggregate, some research institutions and developed country also once carried out shaping by rotating eccentricity cylinder, ball mill or stirrer to the aggregate after fragmentation, reach the object removing surperficial mortar further, thus improve aggregate quality.

Three, summary of the invention

The object of this invention is to provide a kind of preparation method of high-quality Aggregate of recycled concrete, adopt the method can prepare the regeneration aggregate product of high-quality.

The present invention achieves the above object by the following technical programs, a kind of high-quality Aggregate of recycled concrete, and the quality of this aggregate is as follows:

Grating: fine aggregate 0.16 ~ 5mm, grating is I district's coarse sand; Coarse aggregate 5 ~ 20mm, meets grating requirement;

Apparent density: fine aggregate 2500 ~ 2780kg/m 3, coarse aggregate 2440 ~ 2670kg/m 3;

Crush index: coarse aggregate 10.8 ~ 12.7%;

Water-intake rate: fine aggregate 5.4 ~ 7.2%, coarse aggregate 1.91 ~ 4.07%;

Elongated particles: 3.0 ~ 3.8%;

Silt content: be less than 5%.

A preparation method for high-quality Aggregate of recycled concrete, the method comprises the following steps:

1, discarded concrete is sorted, removing timber, metal, paper scrap and plastic contaminant wherein;

2, the waste concrete block sorted is carried out hammering, obtain the block of reduced size;

3, utilize jaw crusher to carry out one-level fragmentation to the block of discarded concrete reduced size, after broken, the aggregate output of particle diameter 5 ~ 40mm controls 80 ~ 90%;

4, the fragment obtained after jaw crushing crusher machine is carried out one-level screening, sift out the aggregate being greater than 5mm, sent into grinding in ball grinder 10 ~ 15min that rod iron is housed, obtain a kind of regeneration aggregate;

5, the regeneration aggregate after rod milling is carried out secondary screening, obtain the fine aggregate that particle diameter is 0.16 ~ 5mm, particle diameter is the coarse aggregate of 5 ~ 10mm, 10 ~ 15mm and 15 ~ 20mm;

6, clean, by the earth on regeneration aggregate surface and fine powder removing;

7, airing, the regeneration aggregate after airing can be deposited respectively.

Rod milling technique is introduced in the production of regenerative bone material by concrete by the present invention first, and in work, regeneration aggregate is brought between rod iron and barrel, and rod iron and regeneration aggregate generation roll extrusion are collided, and regeneration aggregate is impacted and grinds, and completes crushing action.Selecting the addition manner of rod iron that size and grating are suitable, working hour and material according to the size of the granularity of regeneration aggregate and grinding machine, is the guarantee of rod mill performance maximum efficiency.

The present invention compared with prior art, has the following advantages:

1, different-grain diameter scope, the good regeneration aggregate of particle shape is obtained;

2, improve the mortar stripping rate of regeneration aggregate, reduce the water-intake rate of regeneration aggregate, mechanical property is suitable with natural aggregate;

3, discharge process is more convenient, without the need to being taken out by grinding medium;

4, work consuming time shorter, efficiency is lower, has obvious economic benefit;

5, can to reclaim in a large number and discarded concrete in efficiency utilization building waste, save the land seizure amount of a large amount of building waste landfill;

6, make full use of discarded concrete, there is obvious environment, economy and social synthesis's benefit.Prepared high quality recycled aggregates can be used for configuration Green High Performance regeneration concrete, in road engineering, public works and building engineering.

Four, accompanying drawing explanation

Fig. 1 is the coarse aggregate outside drawing after C30 fragmentation.

Fig. 2 is the coarse aggregate outside drawing after C30 rod milling.

Fig. 3 is the coarse aggregate outside drawing after C40 fragmentation.

Fig. 4 is the coarse aggregate outside drawing after C40 rod milling.

Fig. 5 is the coarse aggregate outside drawing after C50 fragmentation.

Fig. 6 is the coarse aggregate outside drawing after C50 rod milling.

Fig. 7 is outside drawing after road waste concrete disintegrating.

Fig. 8 is outside drawing after the rod milling of road waste concrete.

Preparation method's experiment process figure of Fig. 9 high-quality Aggregate of recycled concrete of the present invention.

Five, embodiment

Below by way of specific embodiment, technical scheme of the present invention is further described.

As shown in Figure 9, the preparation method of high-quality Aggregate of recycled concrete of the present invention, comprises the following steps:

1, sort, adopt the method for manual sorting, wooden, papery, metal and plastic material in removing building waste;

2, hammering, the object of hammering is that discarded concrete bulk crushing is become fritter;

3, primary crushing, by the waste concrete block after hammering, use particle size range to require to select suitable jaw crusher to carry out fragmentation according to regeneration aggregate, after broken, the aggregate output of particle diameter 5 ~ 40mm controls 80 ~ 90%;

4, one-level screening, sieves the discarded concrete aggregate after one-level fragmentation with the sieve of lifting that sieve aperture is 5mm;

5, grind, the aggregate of > 5mm after screening is sent in rod mill, according to grindability and the charging capacity of aggregate, loads the rod iron of suitable grating, grinding 10 ~ 15min, then discharging;

6, secondary screening, the aggregate size scope after grinding is comparatively large, needs utilization to lift sieve and carries out secondary screening.The fine aggregate of 0.16 ~ 5mm can be obtained, the coarse aggregate of particle diameter 5 ~ 10mm, the coarse aggregate of particle diameter 10 ~ 15mm, the coarse aggregate of particle diameter 15 ~ 20mm and the aggregate of other grating after secondary screening;

7, clean, the object of cleaning removes earth and the fine powder of aggregate surface, these earth and fine powder can affect the intensity of aggregate and aggregate in concrete with the cohesive force of cement slurry;

Pour in bucket by the aggregate meeting Particle size requirements after screening, then in bucket, pour into tap water, the water surface piles up top more than 100mm higher than coarse aggregate; After coarse aggregate soaks 24h in water, coarse aggregate is washed by rubbing with the hands repeatedly, remove the silt being attached to coarse aggregate surface as far as possible; After fine aggregate soaks 24h in water, with the sieve of lifting of 0.16mm, fine aggregate is cleaned, remove the silt in fine aggregate as far as possible;

8, airing, is positioned over the coarse aggregate after cleaning on clean flooring, makes coarse aggregate air-dry in its natural state, to keep the saturated dry surface of coarse aggregate, and storage.

Embodiment 1

Collect the cubes discarded concrete test block of 150 × 150 × 150mm of laboratory after strength test, strength grade is C30, containing more cobble and part rubble in primary aggregate.Process by described method steps, the regeneration aggregate quality obtained is as follows:

(1) Fig. 1 is that the test block of this strength grade carries out the appearance images after one-level fragmentation through PE300 × 500 type jaw crusher, and particle size range is 5 ~ 40mm, mostly is prolate shape.

(2) Fig. 2 is be that (rod iron is combined as Φ 50 × 150mm3 root for the rod mill of 500 × 500 × 500mm through specification, Φ 40 × 150mm5 root, Φ 30 × 150mm5 root) process the coarse aggregate outside drawing after 10min, particle shape is better, and the mortar on the cobble surface degree that comes off is better.

Embodiment 2

Collect the cubes discarded concrete test block of 150 × 150 × 150mm of laboratory after strength test, strength grade is C40, is substantially all rubble in primary aggregate.Process by described method steps, the regeneration aggregate quality obtained is as follows:

(1) Fig. 3 is that the test block of this strength grade carries out the appearance images after one-level fragmentation through PE300 × 500 type jaw crusher, and particle size range is 5 ~ 40mm, and mostly is prolate shape.

(2) Fig. 4 is the coarse aggregate outside drawing after the rod mill (rod iron is combined as Φ 50 × 150mm3 root, Φ 40 × 150mm5 root, Φ 30 × 150mm5 root) being 500 × 500 × 500mm through specification processes 10min, and particle shape is better.

Embodiment 3

Collect the cubes discarded concrete test block of 150 × 150 × 150mm of laboratory after strength test, strength grade is C50, is substantially all rubble in primary aggregate.Process by described method steps, the regeneration aggregate quality obtained is as follows:

(1) Fig. 5 is that the test block of this strength grade carries out the appearance images after one-level fragmentation through PE300 × 500 type jaw crusher, and particle size range is 5 ~ 40mm, the particle containing part prolate shape.

(2) Fig. 6 is the coarse aggregate outside drawing after the rod mill (rod iron is combined as Φ 50 × 150mm3 root, Φ 40 × 150mm5 root, Φ 30 × 150mm5 root) being 500 × 500 × 500mm through specification processes 10min, and particle shape is better.

Embodiment 4

Collect the discarded concrete produced in road repair process, strength grade is C35, be substantially all rubble, and former aggregate size is larger in primary aggregate.Process by described method steps, the regeneration aggregate quality obtained is as follows:

(1) Fig. 7 is that the test block of this strength grade carries out the appearance images after one-level fragmentation through PE300 × 500 type jaw crusher, and particle size range is 5 ~ 40mm, the particle containing part prolate shape.

(2) Fig. 8 is the coarse aggregate outside drawing after the rod mill (rod iron is combined as Φ 50 × 150mm3 root, Φ 40 × 150mm5 root, Φ 30 × 150mm5 root) being 500 × 500 × 500mm through specification processes 10min, and particle shape comparatively one-level fragmentation is better afterwards.Compared to regenerated coarse aggregate prepared by the discarded concrete test block after the strength test of laboratory, its particle shape is better, and content of mortar is also less.

The various regenerated coarse aggregate the performance test results of table 1

Claims (1)

1. a preparation method for high-quality Aggregate of recycled concrete, is characterized in that, the quality of this aggregate is as follows:
Grating: fine aggregate 0.16 ~ 5 mm, grating is I district's coarse sand; Coarse aggregate 5 ~ 20 mm, meets grating requirement;
Apparent density: fine aggregate 2500 ~ 2780 kg/m 3, coarse aggregate 2440 ~ 2670 kg/m 3;
Crush index: coarse aggregate 10.8 ~ 12.7%;
Water-intake rate: fine aggregate 5.4 ~ 7.2%, coarse aggregate 1.91 ~ 4.07%;
Elongated particles: 3.0 ~ 3.8%;
Silt content: be less than 5%,
The preparation method of described high-quality Aggregate of recycled concrete, comprises the following steps:
(1) discarded concrete is sorted, removing timber, metal, paper scrap and plastic contaminant wherein;
(2) waste concrete block sorted is carried out hammering, obtain the block of reduced size;
(3) utilize jaw crusher to carry out one-level fragmentation to the block of discarded concrete reduced size, after broken, the aggregate output of particle diameter 5 ~ 40 mm controls 80 ~ 90%;
(4) fragment obtained after jaw crushing crusher machine is carried out one-level screening, sift out the aggregate being greater than 5 mm, sent in the rod mill that rod iron is housed and grind 10 ~ 15 min, obtain a kind of regeneration aggregate; Described rod mill specification is 500 × 500 × 500 mm, and rod iron is combined as 50 × 150 mm 3, 40 × 150 mm 5, 30 × 150 mm 5,
(5) regeneration aggregate after rod milling is carried out secondary screening, obtain the fine aggregate that particle diameter is 0.16 ~ 5 mm, particle diameter is the coarse aggregate of 5 ~ 10 mm, 10 ~ 15 mm and 15 ~ 20 mm;
(6) clean, by the earth on regeneration aggregate surface and fine powder removing;
(7) airing, the regeneration aggregate after airing can be deposited respectively.
CN201310216136.1A 2013-06-03 2013-06-03 A kind of preparation method of high-quality Aggregate of recycled concrete CN103332881B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310216136.1A CN103332881B (en) 2013-06-03 2013-06-03 A kind of preparation method of high-quality Aggregate of recycled concrete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310216136.1A CN103332881B (en) 2013-06-03 2013-06-03 A kind of preparation method of high-quality Aggregate of recycled concrete

Publications (2)

Publication Number Publication Date
CN103332881A CN103332881A (en) 2013-10-02
CN103332881B true CN103332881B (en) 2015-10-14

Family

ID=49241109

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310216136.1A CN103332881B (en) 2013-06-03 2013-06-03 A kind of preparation method of high-quality Aggregate of recycled concrete

Country Status (1)

Country Link
CN (1) CN103332881B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103626413B (en) * 2013-10-21 2015-11-18 常州市建筑科学研究院股份有限公司 The preparation technology of Aggregate of recycled concrete
CN104261715A (en) * 2014-08-27 2015-01-07 广东新谷科技有限公司 Construction waste recycling technology
CN104556766A (en) * 2015-01-27 2015-04-29 安徽同济建设集团有限责任公司 Construction method for building foundation bed employing recycled concrete
CN105060753A (en) * 2015-08-20 2015-11-18 浙江工业大学 Particle shaping method for machine-made aggregate
CN105367004A (en) * 2015-11-27 2016-03-02 山西四建集团有限公司 C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method
CN105502984A (en) * 2015-12-16 2016-04-20 沙洲职业工学院 Production technology of recycled concrete aggregate
CN106824997A (en) * 2017-02-17 2017-06-13 苏州益普敦新材料科技有限公司 A kind of building waste prepares the production equipment of renewable building material
CN107282253A (en) * 2017-05-17 2017-10-24 北京建工资源循环利用投资有限公司 Treating construction waste method
CN109465104A (en) * 2018-10-20 2019-03-15 深圳市宏恒星再生科技有限公司 Remaining body refuse soil processing method
CN110550898B (en) * 2019-10-12 2020-05-08 河北正实城建开发有限公司 Pretreatment method for raw materials for preparing recycled concrete

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
建筑垃圾再生粗细骨料对混凝土强度的影响;邱树恒等;《广西大学学报:自然科学版》;20110630;第36卷(第3期);第518-524页 *
李秋义等.棒磨研磨法.《混凝土再生骨料》.中国建筑工业出版社,2011,第36-37页. *

Also Published As

Publication number Publication date
CN103332881A (en) 2013-10-02

Similar Documents

Publication Publication Date Title
Sonawane et al. Use of recycled aggregate concrete
CN105461249B (en) A kind of building waste prepares the production technology and equipments of renewable building material
CN102284350B (en) Sorting and separation process for utilizing slag comprehensively
CN103183483B (en) A kind of environmental friendliness supplementary cementitious material and preparation method thereof
CN102806133B (en) Machine-made sand processing process
CN103769287B (en) Domestic waste incineration residue fragmentation, sorting and recycling technique
CN101734895B (en) Process for producing regenerated building waste autoclaved brick
CN1186134C (en) Method for treating inorganic solid waste and application
CN201357163Y (en) Domestic garbage and construction waste mixture sorting device
CN103626413B (en) The preparation technology of Aggregate of recycled concrete
CN101244906B (en) Method for manufacturing high-activity mineral blending material and application thereof
JP2006320814A (en) Manufacturing method of recycled fine aggregate, and recycled fine aggregate
CN102211889A (en) Method for resource recovery of construction wastes
CN102199019A (en) Brick-concrete building garbage road base material and production device and production method thereof
CN103058613A (en) Curb produced by using waste ceramic slag and waste road concrete and manufacturing method
CN206334739U (en) A kind of building waste pulverizer for being easy to take out material
CN1911542A (en) Comprehensive treatment method for architectural garbage
KR100893303B1 (en) Waste-aspalt concrete, waste-concrete using recyclable aspalt concrete and ti's method
CN101927257A (en) Fixed building rubbish treatment device
CN201823744U (en) Comprehensive treatment device for construction waste
CN201150926Y (en) Builders rubbish comprehensive processing and utilizing system
CN103755188B (en) Building waste Ecological treatment technology
CN101318193A (en) Wet separation method for domestic garbage
CN1990129A (en) A method for comprehensive treatment of construction refuse
CN104722396B (en) Comprehensive utilization method of magnetite-containing country rock

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model