CN103332881A - Preparation method for high-quality recycled concrete aggregates - Google Patents

Preparation method for high-quality recycled concrete aggregates Download PDF

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CN103332881A
CN103332881A CN2013102161361A CN201310216136A CN103332881A CN 103332881 A CN103332881 A CN 103332881A CN 2013102161361 A CN2013102161361 A CN 2013102161361A CN 201310216136 A CN201310216136 A CN 201310216136A CN 103332881 A CN103332881 A CN 103332881A
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aggregate
concrete
coarse
regeneration
quality
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CN2013102161361A
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Chinese (zh)
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CN103332881B (en
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冯庆革
朱惠英
李贞�
周维
李浩璇
卢凌寰
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广西大学
广西壮族自治区建筑科学研究设计院
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    • Y02W30/95

Abstract

Provided is a preparation method for high-quality recycled concrete aggregates. The preparation method comprises steps of sorting of waste concrete, primary crushing, primary screening, rod milling, secondary screening and cleaning, and then the graded aggregates are mixed according to required gradations to obtain recycled coarse aggregates with different particle sizes. According to the preparation method, the cyclic utilization rate of waste concrete can be close to 80%, the resource utilization of construction waste in cities can be realized, the secondary pollution of construction waste to the environment can be reduced, the land occupation account for landfilling of construction waste can be saved, and the industrialization development of comprehensive utilization of construction waste can be promoted to some 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, being specifically related to the discarded concrete is the preparation method that main raw material is processed into a kind of high-quality regeneration aggregate of the high-performance regenerated aggregate concrete that can dispose the medium tenacity grade.

Two, background technology

Building waste becomes the inevitable outcome of urbanization process, but because it accounts for the municipal solid wastes larger proportion, and processing mode is more rudimentary, environment has been caused great destruction, and threaten the natural resources of worsening shortages.Therefore, actively pushing forward minimizing and the comprehensive utilization of resources of building waste, realize the synchronous propelling coordinated development of economic benefit, ecological benefits and social benefit, is the emphasis direction of construction industry Sustainable development.

Discarded concrete in the building waste is the key object of recycling, regeneration aggregate is its product, but the regeneration aggregate surface adhesion the mortar of inequality, cause the every index instability of regeneration aggregate, influence dispose concrete intensity, shrink, creep and weather resistance etc., therefore, the mortar that how will adhere to primary aggregate surface effectively breaks away from, and obtaining cleaner aggregate is the crucial difficult point of whole technique.

The major technique of producing regeneration aggregate at present is that repeatedly broken, screening obtains the appropriate particle size aggregate, some research institutions and developed country also once carried out shaping by rotating eccentricity tube, ball mill or the stirrer aggregate after to fragmentation, reach the purpose of the surperficial mortar of further removal, thereby improve the aggregate quality.

Three, summary of the invention

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

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 coarse sand; Coarse aggregate 5~20mm satisfies the 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%;

Faller gill shape content: 3.0~3.8%;

Silt content: less than 5%.

A kind of preparation method of high-quality Aggregate of recycled concrete, this method may further comprise the steps:

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

2, will sort good waste concrete block and carry out hammering, obtain the block of reduced size;

3, utilize jaw crusher that the block of discarded concrete reduced size is carried out the one-level fragmentation, the aggregate output control of broken back particle diameter 5~40mm is 80~90%;

4, the fragment that will obtain behind the jaw crushing crusher machine carries out the one-level screening, sifts out the aggregate greater than 5mm, and it is sent into grinding in ball grinder 10~15min that rod iron is housed, and obtains a kind of regeneration aggregate;

5, the regeneration aggregate after the rod milling is carried out the 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, earth and the fine powder on regeneration aggregate surface are removed;

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

The present invention introduces rod milling technology in the production of concrete regenerating aggregate first, and regeneration aggregate is brought between rod iron and the barrel in the work, rod iron and regeneration aggregate generation roll extrusion collision, and regeneration aggregate is impacted and is ground, and finishes crushing action.Selecting the addition manner of suitable rod iron, working hour and material of size and grating according to the size of the granularity of regeneration aggregate and grinding machine, is the guarantee that rod mill is brought into play maximum efficiency.

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

1, obtains different-grain diameter scope, particle shape regeneration aggregate preferably;

2, the mortar that improves regeneration aggregate is peeled off rate, reduces the water-intake rate of regeneration aggregate, and mechanical property and natural aggregate are suitable;

3, discharge process is more convenient, need not grinding medium is taken out;

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

5, can reclaim and efficiently utilize discarded concrete in the building waste in a large number, the land seizure amount of saving a large amount of building waste landfills;

6, take full advantage of discarded concrete, have tangible environment, economy and social synthesis's benefit.Prepared high-quality regeneration aggregate can be used for disposing the Green High Performance regeneration concrete, is used for road engineering, public works and building engineering.

Four, description of drawings

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

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

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

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

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

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

Fig. 7 is outside drawing after the fragmentation of road discarded concrete.

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

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

Five, embodiment

Below by 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 may further comprise the steps:

1, manual sorting's method is adopted in letter sorting, removes wooden, papery, metal and plastic material in the building waste;

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

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

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

5, grind, will sieve the aggregate of back>5mm and send in the rod mill, according to grindability and the charging capacity of aggregate, the rod iron of the suitable grating of packing into grinds 10~15min, discharging then;

6, secondary screening, the aggregate size scope after the grinding is bigger, needs to utilize to lift to sieve to carry out the secondary screening.After the secondary screening, can obtain the fine aggregate of 0.16~5mm, 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;

7, clean, the purpose of cleaning is to remove earth and the fine powder of aggregate surface, these earth and fine powder can influence the intensity of aggregate and aggregate in concrete with the cohesive force of cement slurry;

The aggregate that meets the particle diameter requirement after the screening is poured in the bucket, poured into tap water then in bucket, the water surface is higher than coarse aggregate and piles up more than the 100mm of top; Coarse aggregate is washed by rubbing with the hands repeatedly to coarse aggregate soak 24h in water after, removes the silt that is attached to the coarse aggregate surface as far as possible; Fine aggregate soaks 24h in water after, with the sieve of lifting of 0.16mm fine aggregate is cleaned, remove the silt in the fine aggregate as far as possible;

8, airing is positioned over the coarse aggregate after cleaning on the clean flooring, makes coarse aggregate air-dry under state of nature, to keep the saturated surface dry condition of coarse aggregate, stores.

Embodiment 1

Collect the cubes discarded concrete test block of 150 * 150 * 150mm of laboratory after strength test, strength grade is C30, contains more cobble and part rubble in the former raw aggregate.Process by described method steps, the regeneration aggregate quality that obtains is as follows:

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

(2) Fig. 2 is for being 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) handle coarse aggregate outside drawing behind the 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, substantially all is rubble in the former raw aggregate.Process by described method steps, the regeneration aggregate quality that obtains is as follows:

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

(2) Fig. 4 is for being 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) of 500 * 500 * 500mm is handled 10min through specification, 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, substantially all is rubble in the former raw aggregate.Process by described method steps, the regeneration aggregate quality that obtains is as follows:

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

(2) Fig. 6 is for being 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) of 500 * 500 * 500mm is handled 10min through specification, and particle shape is better.

Embodiment 4

Collect the discarded concrete that produces in the road maintenance process, strength grade is C35, substantially all be rubble in the former raw aggregate, and former aggregate particle diameter is bigger.Process by described method steps, the regeneration aggregate quality that obtains is as follows:

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

(2) Fig. 8 is for through specification being 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) of 500 * 500 * 500mm is handled 10min, and particle shape is better after than the one-level fragmentation.The regenerated coarse aggregate that discarded concrete test block after the strength test of laboratory prepares, its particle shape is better, and mortar content is also still less.

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

Claims (2)

1. a high-quality Aggregate of recycled concrete is characterized in that, the quality of this aggregate is as follows:
Grating: fine aggregate 0.16~5mm, grating is I district coarse sand; Coarse aggregate 5~20mm satisfies the 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%;
Faller gill shape content: 3.0~3.8%;
Silt content: less than 5%.
2. the preparation method of high-quality Aggregate of recycled concrete as claimed in claim 1 is characterized in that, this method may further comprise the steps:
(1) discarded concrete is sorted, remove wherein timber, metal, paper scrap and plastic contaminant;
(2) will sort good waste concrete block and carry out hammering, obtain the block of reduced size;
(3) utilize jaw crusher that the block of discarded concrete reduced size is carried out the one-level fragmentation, the aggregate output control of broken back particle diameter 5~40mm is 80~90%;
(4) fragment that will obtain behind the jaw crushing crusher machine carries out the one-level screening, sifts out the aggregate greater than 5mm, and it is sent into grinding in ball grinder 10~15min that rod iron is housed, and obtains a kind of regeneration aggregate;
(5) regeneration aggregate after the rod milling is carried out the 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, earth and the fine powder on regeneration aggregate surface are removed;
(7) airing, the regeneration aggregate after the 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)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103626413A (en) * 2013-10-21 2014-03-12 常州市建筑科学研究院股份有限公司 Preparation process of recycled concrete aggregate
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
CN110550898A (en) * 2019-10-12 2019-12-10 郭金生 pretreatment method for raw materials for preparing recycled concrete

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
李秋义等: "《混凝土再生骨料》", 28 February 2011, article "棒磨研磨法", pages: 36-37 *
邱树恒等: "建筑垃圾再生粗细骨料对混凝土强度的影响", 《广西大学学报:自然科学版》, vol. 36, no. 3, 30 June 2011 (2011-06-30), pages 518 - 524 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103626413A (en) * 2013-10-21 2014-03-12 常州市建筑科学研究院股份有限公司 Preparation process of recycled concrete aggregate
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
CN110550898A (en) * 2019-10-12 2019-12-10 郭金生 pretreatment method for raw materials for preparing recycled concrete
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

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