CN111499244B - Method for improving quality of recycled coarse aggregate by utilizing cane molasses - Google Patents
Method for improving quality of recycled coarse aggregate by utilizing cane molasses Download PDFInfo
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- CN111499244B CN111499244B CN202010431945.4A CN202010431945A CN111499244B CN 111499244 B CN111499244 B CN 111499244B CN 202010431945 A CN202010431945 A CN 202010431945A CN 111499244 B CN111499244 B CN 111499244B
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- coarse aggregate
- recycled coarse
- recycled
- cane molasses
- improving
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Classifications
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- 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
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
-
- 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
-
- 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
Abstract
The invention discloses a method for improving the quality of recycled coarse aggregate by utilizing cane molasses, which is implemented according to the following steps: step 1, pretreating recycled coarse aggregate made of waste concrete; step 2, completely immersing the recycled coarse aggregate treated in the step 1 into a cane molasses solution for soaking; step 3, taking out the recycled coarse aggregate soaked in the step 2, and putting the recycled coarse aggregate into a vibration table for vibration; and 4, taking out the regenerated coarse aggregate vibrated in the step 3, screening and cleaning the regenerated coarse aggregate, and naturally airing the regenerated coarse aggregate. The problem of poor performance of the recycled coarse aggregate prepared by utilizing the construction waste is solved, the performance of the recycled coarse aggregate is improved, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of building material treatment, and relates to a method for improving the quality of a recycled coarse aggregate by utilizing cane molasses.
Background
With the rapid development of society, the nation has greatly advanced the modernization construction, so the domestic construction industry is in the rapid development period at present. The large-area reconstruction of old buildings and the development of new buildings bring two problems of building waste enclosing city and insufficient building material resources. Meanwhile, the resources of natural sand in most regions are increasingly in shortage, and in the situation, the natural sand is replaced by broken mined mountain stones in part of regions, so that mine resources are seriously consumed. The method has the advantages that the waste concrete is prepared into the recycled coarse aggregate, so that the problem of construction waste can be solved, the exploitation of river sand and mines can be reduced, and the method achieves two purposes at one stroke.
The traditional preparation method of the recycled aggregate comprises the steps of crushing the waste concrete for one time or multiple times, and then screening to obtain the recycled aggregates with different particle sizes, wherein the recycled aggregates comprise recycled coarse aggregates with the particle size larger than 5mm and traditional recycled fine aggregates with the particle size smaller than 5 mm. Compared with river sand concrete with the same proportion, the working performance of the traditional recycled coarse aggregate concrete is deteriorated along with the increase of the substitution rate, and the concrete is difficult to popularize and apply in engineering. This is consistent with the current situation that the recycled coarse aggregate is applied to concrete in a small amount, is mostly used for filling, and has a low selling price. Therefore, the method has great research significance on how to improve the aggregate quality of the recycled coarse aggregate and improve the application value of the recycled coarse aggregate.
It is well known that the sugar industry can make a great contribution to the economic development of regions and can be one of the most serious pollution industries at the same time. Cane molasses is an industrial waste material produced in the sugar production process, commonly known as orange water. It is a dark brown, viscous liquid. The cane molasses contains components including sucrose, reducing sugar, pigment, inorganic salts and other trace minerals, and is an excellent fermentation raw material, so that a large amount of molasses is used to ferment alcohol. The cane molasses is mainly used as a raw material for producing cement grinding aids and concrete additives in the building industry at present in the building industry.
Disclosure of Invention
The invention aims to provide a method for improving recycled coarse aggregate by utilizing cane molasses, and solves the problem of poor performance of the recycled coarse aggregate in the prior art.
The technical scheme adopted by the invention is that a method for improving the quality of recycled coarse aggregate by utilizing cane molasses is implemented according to the following steps:
step 1, pretreating recycled coarse aggregate made of waste concrete;
step 2, completely immersing the recycled coarse aggregate treated in the step 1 into a cane molasses solution for soaking;
step 3, taking out the recycled coarse aggregate soaked in the step 2, and putting the recycled coarse aggregate into a vibration table for vibration;
and 4, taking out the regenerated coarse aggregate vibrated in the step 3, screening and cleaning the regenerated coarse aggregate, and naturally airing the regenerated coarse aggregate.
The invention is also characterized in that:
the pretreatment in the step 1 specifically comprises the following steps: and cleaning the recycled coarse aggregate, removing impurities in the recycled coarse aggregate, and drying the recycled coarse aggregate.
The drying temperature is 80 ℃, and the drying time is 3 h.
In the step 2, the mass concentration of the cane molasses solution is 10-30%.
And 2, soaking for 2-5 days, and stirring once every 2 hours in the soaking process.
The vibration frequency in step 3 is 2800 times/min, and the vibration time is 10-20 min.
The aperture of the sieve used in the screening process in the step 4 is 5 mm.
The particle size of the recycled coarse aggregate is 5-30 mm.
The invention has the beneficial effects that:
(1) the invention relates to a method for improving the quality of a recycled coarse aggregate by utilizing cane molasses, which is characterized in that cane molasses solution is adsorbed on the surface of cement particles to form a hydrophilic film with the same charge, so that the cement particles are mutually repelled and the cement hydration is hindered, the mortar strength on the surface of the recycled coarse aggregate is seriously degraded, and the mortar falls off in the vibration process of a vibration table, thereby reducing the water absorption rate of the recycled coarse aggregate and improving the apparent density of the recycled coarse aggregate;
(2) the method for improving the quality of the recycled coarse aggregate by utilizing the cane molasses has the advantages that the cane molasses is low in cost and easy to obtain, and the used cane molasses solution can be recycled and continuously utilized, so that the cost of strengthening the recycled coarse aggregate is further reduced;
(3) the method for improving the quality of the recycled coarse aggregate by utilizing the cane molasses can widely utilize the recycled coarse aggregate, save a large amount of garbage treatment cost and reduce the environmental pollution;
(4) the method for improving the quality of the recycled coarse aggregate by utilizing the cane molasses repairs and improves the recycled coarse aggregate of the waste concrete, can improve the quality of the recycled coarse aggregate, and can also pour large-volume hydraulic concrete, roller compacted concrete, concrete constructed under hot weather conditions, concrete poured in a large area, concrete without cold seams, concrete needing long-time parking or long-distance transportation and the like by utilizing the improved recycled coarse aggregate because the cane molasses can prolong the concrete setting time.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention discloses a method for improving recycled coarse aggregate by utilizing cane molasses, which is implemented according to the following steps:
step 1, pretreating recycled coarse aggregate prepared from waste concrete, specifically: cleaning the recycled coarse aggregate, removing impurities in the recycled coarse aggregate, and drying at 80 ℃ for 3h, wherein the particle size of the recycled coarse aggregate is 5-30 mm;
step 2, completely immersing the recycled coarse aggregate treated in the step 1 into a cane molasses solution with the mass concentration of 10-30% for soaking for 2-5 days, and stirring once every 2 hours in the soaking process;
step 3, taking out the recycled coarse aggregate soaked in the step 2, and putting the recycled coarse aggregate into a vibration table for vibration, wherein the vibration frequency is 2800 times/minute, and the vibration time is 10-20 min;
and 4, taking out the regenerated coarse aggregate vibrated in the step 3, putting the regenerated coarse aggregate into a sieve with the aperture of 5mm, screening, cleaning and naturally airing.
Example 1
The invention relates to a method for improving the quality of a recycled coarse aggregate by utilizing cane molasses, which is implemented according to the following steps:
step 1, pretreating recycled coarse aggregate, specifically: cleaning the recycled coarse aggregate, removing impurities in the recycled coarse aggregate, and drying at 80 ℃ for 3h, wherein the particle size of the recycled coarse aggregate is 5-30 mm;
step 2, completely immersing the recycled coarse aggregate processed in the step 1 into a cane molasses solution with the mass concentration of 10% for soaking for 2 days, and stirring once every 2 hours in the soaking process;
step 3, taking out the recycled coarse aggregate soaked in the step 2, and putting the recycled coarse aggregate into a vibration table for vibration, wherein the vibration frequency is 2800 times/minute, and the vibration time is 10 min;
and 4, taking out the regenerated coarse aggregate vibrated in the step 3, putting the regenerated coarse aggregate into a sieve with the aperture of 5mm, screening, cleaning and naturally airing.
According to the test method specified by the concrete recycled coarse aggregate specification (GBT 25177-2010), the water absorption rate and the apparent density of the recycled coarse aggregate after the treatment are tested, and the samples collected in the test are samples soaked for 1 day and samples soaked for 2 days respectively.
Example 2
The invention relates to a method for improving the quality of a recycled coarse aggregate by utilizing cane molasses, which is implemented according to the following steps:
step 1, pretreating recycled coarse aggregate, specifically: cleaning the recycled coarse aggregate, removing impurities in the recycled coarse aggregate, and drying at 80 ℃ for 3h, wherein the particle size of the recycled coarse aggregate is 5-30 mm;
step 2, completely immersing the recycled coarse aggregate processed in the step 1 into a cane molasses solution with the mass concentration of 15% for soaking for 3 days, and stirring once every 2 hours in the soaking process;
step 3, taking out the recycled coarse aggregate soaked in the step 2, and putting the recycled coarse aggregate into a vibration table for vibration, wherein the vibration frequency is 2800 times/minute, and the vibration time is 15 min;
and 4, taking out the regenerated coarse aggregate vibrated in the step 3, putting the regenerated coarse aggregate into a sieve with the aperture of 5mm, screening, cleaning and naturally airing.
According to the test method specified by the concrete recycled coarse aggregate specification (GBT 25177-2010), the water absorption rate and the apparent density of the recycled coarse aggregate after the treatment are tested, and the samples collected in the test are samples soaked for 1 day, 2 days and 3 days respectively.
Example 3
The invention relates to a method for improving the quality of a recycled coarse aggregate by utilizing cane molasses, which is implemented according to the following steps:
step 1, pretreating recycled coarse aggregate, specifically: cleaning the recycled coarse aggregate, removing impurities in the recycled coarse aggregate, and drying at 80 ℃ for 3h, wherein the particle size of the recycled coarse aggregate is 5-30 mm;
step 2, completely immersing the recycled coarse aggregate processed in the step 1 into a cane molasses solution with the mass concentration of 20% for soaking for 4 days, and stirring once every 2 hours in the soaking process;
step 3, taking out the recycled coarse aggregate soaked in the step 2, and putting the recycled coarse aggregate into a vibration table for vibration, wherein the vibration frequency is 2800 times/minute, and the vibration time is 15 min;
and 4, taking out the regenerated coarse aggregate vibrated in the step 3, putting the regenerated coarse aggregate into a sieve with the aperture of 5mm, screening, cleaning and naturally airing.
According to the test method specified by the concrete recycled coarse aggregate specification (GBT 25177-2010), the water absorption rate and the apparent density of the recycled coarse aggregate after the treatment are tested, and the samples collected in the test are samples soaked for 1 day, 2 days, 3 days and 4 days respectively.
Example 4
The invention relates to a method for improving the quality of a recycled coarse aggregate by utilizing cane molasses, which is implemented according to the following steps:
step 1, pretreating recycled coarse aggregate, specifically: cleaning the recycled coarse aggregate, removing impurities in the recycled coarse aggregate, and drying at 80 ℃ for 3h, wherein the particle size of the recycled coarse aggregate is 5-30 mm;
step 2, completely immersing the recycled coarse aggregate processed in the step 1 into a cane molasses solution with the mass concentration of 30% for soaking for 5 days, and stirring once every 2 hours in the soaking process;
step 3, taking out the recycled coarse aggregate soaked in the step 2, and putting the recycled coarse aggregate into a vibration table for vibration, wherein the vibration frequency is 2800 times/minute, and the vibration time is 20 min;
and 4, taking out the regenerated coarse aggregate vibrated in the step 3, putting the regenerated coarse aggregate into a sieve with the aperture of 5mm, screening, cleaning and naturally airing.
According to the test method specified by the concrete recycled coarse aggregate specification (GBT 25177-2010), the water absorption rate and the apparent density of the recycled coarse aggregate after the treatment are tested, and the samples collected in the test are samples soaked for 1 day, 2 days, 3 days, 4 days and 5 days respectively.
Comparative example
The method comprises the steps of selecting recycled coarse aggregate with the particle size of 5-30 mm, carrying out no treatment on the recycled coarse aggregate, and measuring the water absorption rate and the apparent density of the recycled coarse aggregate according to a test method specified in concrete recycled coarse aggregate specification (GBT 25177-2010).
And (3) test comparison:
apparent density and water absorption of the recycled coarse aggregates treated in examples 1 to 4 were tested, and apparent density and water absorption of the recycled coarse aggregates untreated in comparative examples were tested, with water absorption test data shown in table 1 and apparent density test data shown in table 2.
Table 1 water absorption test results
Table 2 apparent density test results
As can be seen from tables 1 and 2, the method for improving the quality of the recycled coarse aggregate by utilizing the cane molasses has the advantages that the different degrees of water absorption are obviously reduced, the different degrees of apparent density are obviously improved, and therefore, the service performance of the processed recycled coarse aggregate is greatly improved, the comparison shows that the mass fraction of the cane molasses solution in example 4 is 30%, the soaking time is 5 days, the vibration time of the vibration table is 20min, the effect is optimal, the water absorption of the recycled coarse aggregate is reduced by 44.9%, and the apparent density is increased by 11.6%.
According to the classification of the water absorption and the apparent density of the recycled coarse aggregate in the national standard GB/T25177-2010 (see the table 3 in detail), the water absorption and the apparent density of the example 4 can reach the II-grade standard of the recycled coarse aggregate for the national standard GB/T25177-2010 concrete, and meet the standard of the aggregate in the application of building engineering.
TABLE 3 recycled coarse aggregate classification
| Item | Class I | Class II | Class III |
| Water absorption (%) | ＜3.0 | ＜5.0 | ＜8.0 |
| Apparent density (g/cm)3) | ＞2.45 | ＞2.35 | ＞2.25 |
The invention relates to a method for improving the quality of a recycled coarse aggregate by utilizing cane molasses, which is characterized in that cane molasses solution can be adsorbed on the surface of cement particles to form a hydrophilic film with the same charge, so that the cement particles are mutually repelled and the cement hydration is hindered, the mortar strength on the surface of the recycled coarse aggregate is seriously degraded, and the mortar falls off in the stirring process, thereby reducing the water absorption of the recycled coarse aggregate. In addition, mutual friction among the coarse aggregates is caused by vibration of the vibrating table, and then residual mortar on the surface of the regenerated coarse aggregates is removed, so that the quality of the regenerated coarse aggregates is improved to meet the II-level standard of the regenerated coarse aggregates for national standard GB/T25177-2010 concrete, the regenerated coarse aggregates are used for preparing new concrete, the problem of disposal of construction waste is solved, the construction waste is recycled in high quality, meanwhile, the problem of difficult treatment of a large amount of concrete waste and negative influence on the environment caused by the difficult treatment of the concrete waste are solved, a large amount of waste treatment cost is saved, huge social benefits and environmental protection benefits are generated, and the regenerated coarse aggregates can be used for large-volume concrete buildings with high requirement on concrete setting time, large-volume hydraulic engineering concrete, roller compacted concrete, concrete constructed under hot weather conditions, poured concrete and concrete with large-area cold seams avoided, Concrete which needs to be parked for a long time or transported for a long distance, and the like.
Claims (6)
1. A method for improving the quality of recycled coarse aggregate by utilizing cane molasses is characterized by comprising the following steps:
step 1, pretreating recycled coarse aggregate made of waste concrete;
step 2, completely immersing the recycled coarse aggregate treated in the step 1 into a cane molasses solution for soaking;
the mass concentration of the cane molasses solution is 10-30%;
the soaking time is 2-5 days, and the stirring is carried out once every 2 hours in the soaking process;
step 3, taking out the recycled coarse aggregate soaked in the step 2, and putting the recycled coarse aggregate into a vibration table for vibration;
and 4, taking out the regenerated coarse aggregate vibrated in the step 3, screening and cleaning the regenerated coarse aggregate, and naturally airing the regenerated coarse aggregate.
2. The method for improving the quality of the recycled coarse aggregate by utilizing the cane molasses as claimed in claim 1, wherein the pretreatment in the step 1 is specifically as follows: and cleaning the recycled coarse aggregate, removing impurities in the recycled coarse aggregate, and drying the recycled coarse aggregate.
3. The method for improving the quality of recycled coarse aggregate by using cane molasses as claimed in claim 2, wherein the drying temperature is 80 ℃ and the drying time is 3 h.
4. The method for improving the quality of recycled coarse aggregate by using cane molasses as claimed in claim 1, wherein the frequency of vibration in step 3 is 2800 times/min, and the vibration time is 10-20 min.
5. The method for improving the quality of recycled coarse aggregate by using cane molasses as claimed in claim 1, wherein the aperture of the sieve used in the sieving process in the step 4 is 5 mm.
6. The method for improving the quality of recycled coarse aggregate by using cane molasses as claimed in claim 1, wherein the grain size of the recycled coarse aggregate is 5mm to 30 mm.
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| CN202010431945.4A CN111499244B (en) | 2020-05-20 | 2020-05-20 | Method for improving quality of recycled coarse aggregate by utilizing cane molasses |
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| CN111499244B true CN111499244B (en) | 2021-12-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060131617A (en) * | 2005-06-16 | 2006-12-20 | (주)명강산업개발 | Pavement with water permeability concrete including a granule reproduction aggregate and polymer cement |
| CN107117901A (en) * | 2017-05-14 | 2017-09-01 | 汪逸凡 | A kind of preparation method of regenerative pervious concrete |
| CN107805023A (en) * | 2017-11-21 | 2018-03-16 | 常州达奥新材料科技有限公司 | A kind of mine paste filling material and preparation method thereof |
| CN110818366A (en) * | 2019-12-25 | 2020-02-21 | 泸州临港思源混凝土有限公司 | Fair-faced concrete and preparation process thereof |
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2020
- 2020-05-20 CN CN202010431945.4A patent/CN111499244B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060131617A (en) * | 2005-06-16 | 2006-12-20 | (주)명강산업개발 | Pavement with water permeability concrete including a granule reproduction aggregate and polymer cement |
| CN107117901A (en) * | 2017-05-14 | 2017-09-01 | 汪逸凡 | A kind of preparation method of regenerative pervious concrete |
| CN107805023A (en) * | 2017-11-21 | 2018-03-16 | 常州达奥新材料科技有限公司 | A kind of mine paste filling material and preparation method thereof |
| CN110818366A (en) * | 2019-12-25 | 2020-02-21 | 泸州临港思源混凝土有限公司 | Fair-faced concrete and preparation process thereof |
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