CN103819152B - A kind of method changing stirring technique intensifying regenerating aggregate concrete - Google Patents
A kind of method changing stirring technique intensifying regenerating aggregate concrete Download PDFInfo
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- CN103819152B CN103819152B CN201310746387.0A CN201310746387A CN103819152B CN 103819152 B CN103819152 B CN 103819152B CN 201310746387 A CN201310746387 A CN 201310746387A CN 103819152 B CN103819152 B CN 103819152B
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- 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
A kind of method changing stirring technique intensifying regenerating aggregate concrete belongs to building material field. Carry out according to following step: (1) is by solid waste jaw crushing crusher machine, the regenerated coarse aggregate becoming to meet the requirement of 4.75 ~ 25mm continuous grading again through screening assembly; (2) by 50% water mixing of cement and total water consumption, stirring 30 ~ 60s, add regenerated coarse aggregate, stir 30 ~ 60s, then add natural thick, fine aggregate stirring 30 ~ 60s, the water finally adding residue 50% stirs 30 ~ 60s, and the slump is surveyed in discharging, makes test block; Compared with the stirring technique that the present invention adopts stirs with routine, the cement slurry of one layer of low water-cement ratio can be wrapped to form on regenerated coarse aggregate surface, the region that regenerated coarse aggregate surface is weak serves the effect repaired and strengthen, enhance the interfacial transition zone between regenerated coarse aggregate and natural aggregate and sand-cement slurry, so that regeneration concrete ultimate compression strength is improved.
Description
Technical field
The invention belongs to building material field, it is specifically related to a kind of method changing stirring technique intensifying regenerating aggregate concrete.
Background technology
In China, along with the development of China's economy, discarded concrete generating capacity also increases day by day, and environment has been caused very big load with process by the generation of discarded concrete. The extending old building being embodied in large, medium and small city, the dismounting of waste and old buildings, the construction of new building, produces building castoff all unavoidably. No matter it is the discarded concrete pulled down from waste and old buildings, or at the waste residue that new building produces in construction process, all belongs to urban architecture rubbish. These building wastes both have impact on urban life environment, causes again environmental pollution.
At present, China's process building waste is mainly transported to countryside building waste and buries, and this not only to be spent a large amount of freight charges, also can cause secondary pollution to city suburbs. Secondly, stack and bury the land resources that these building wastes take a large amount of preciousness again, also by polluted underground water and soil. Therefore, environment has been caused very big load with process by the generation of discarded concrete. Effectively utilize building solid castoff (mainly referring to waste concrete block), make it cyclicity and can utilize renewable resource, also just become very urgent and more and more important.
Current result of study shows, the factor affecting regenerated aggregate concrete intensity is a lot, the cohesive force etc. at new and old interface in the internal injury accumulation of as broken in the physico mechanical characteristic (tap density and apparent density, crush index and water-intake rate, foreign matter content etc.) of regeneration aggregate, regeneration aggregate and working method, regeneration aggregate and tiny crack and regeneration concrete. These factors not only affect the intensity of regeneration concrete, also can affect its endurance quality.
The microscopical structure of regeneration concrete becomes more more complicated than normal concrete due to adding of regeneration aggregate. The complicated microtexture of regenerated aggregate concrete this kind brings bigger difficulty to the weather resistance mechanism analyzing regenerated aggregate concrete, few very few of practical engineering application.
Summary of the invention
For the problems referred to above, the present invention uses concrete solid waste regeneration aggregate configuration regenerated aggregate concrete, explores a kind of effectively high-efficient treatment method of low-quality regeneration aggregate, by changing stirring technique strengthening C20, C30 regenerated aggregate concrete.
A kind of method changing stirring technique intensifying regenerating aggregate concrete of the present invention, carries out according to following step:
(1) by solid waste jaw crushing crusher machine, passing through screening assembly and becoming to meet the regenerated coarse aggregate that 4.75 ~ 25mm continuous grading requires;
(2) by 50% water mixing of cement and total water consumption, stirring 30 ~ 60s, add regenerated coarse aggregate, stir 30 ~ 60s, then add natural thick, fine aggregate stirring 30 ~ 60s, the water finally adding residue 50% stirs 30 ~ 60s, and the slump is surveyed in discharging, makes test block; In whole process, the mass ratio of various materials is cement: water: fine aggregate: coarse aggregate=1:(0.4��0.7): (1.05��3.76): (1.81��3.98), described coarse aggregate is natural coarse aggregate and regenerated coarse aggregate sum, and wherein the mass ratio of natural coarse aggregate and regenerated coarse aggregate is 1:(0��1).
Silicate cement, ordinary Portland cement, slag cement, pulverized fuel ash cement, trass cement or the complex cement that described cement is 32.5-52.5.
Described solid waste be waste cement base concrete, waste and old mortar block, nature or do not fire in discarded coal gangue one or both.
Adopt conventional stirring and artificial-strengthening regeneration aggregate stirring means, regeneration concrete design strength grade is C20, C30 concrete, the group mode of C20, C30 strength grade aggregate is coarse aggregate is regenerated coarse aggregate and natural coarse aggregate, fine aggregate is natural river sand concrete (being called for short RN), regenerated coarse aggregate replaces natural coarse aggregate with mass ratio difference 25%, 50%, 100%, is called for short RN-25, RN-50, RN-100 concrete respectively.
Conventional stirring and artificial-strengthening regeneration aggregate stirring process flow process are as follows:
Conventional stirring:
��
Artificial-strengthening regeneration aggregate stirring means:
��
Adopting aforesaid method, sample dimensions is the cubes of 150mm �� 150mm �� 150mm, specimen molding forced mixer spice, shaking table jolt ramming, and specimen molding carries out compressive strength test after maintenance to 28d after the 24h demoulding under mark supports condition. The mechanical property of regeneration concrete is tested according to GB/T50081-2002 " normal concrete mechanical test method standard ".
When recycled coarse aggregate contents is for being respectively 25%, 50%, 100%, artificial-strengthening regeneration aggregate stirring means improves 11.86%, 12.75%, 10.96% respectively than conventional C20, C30 regenerated aggregate concrete 28 days intensity stirred | with 10.88%, 9.78%, 9.33%. Along with the increase of recycled coarse aggregate contents, configuration C20, C30 Medium and low intensity grade recycled concrete strength is favourable, when its reason is preparation C20, C30 regeneration concrete, water cement ratio is relatively high, recycled coarse aggregate contents increase makes actual water cement ratio decline, under the prerequisite ensureing regeneration concrete degree of compactness, intensity is increased on the contrary, but when Replacement rate is excessive, when reaching 100%, the negative effect that the defect of regenerated coarse aggregate self is brought is greater than actual water cement ratio and reduces the positive effect brought so that decrease in strength. For C20 and C30 Medium and low intensity grade regeneration concrete, maximum intensity when recycled coarse aggregate contents is respectively 50%, probably reaches the stagnation point of positives and negatives so that intensity reaches maximum.
Compared with the stirring technique that the present invention adopts stirs with routine, the cement slurry of one layer of low water-cement ratio can be wrapped to form on regenerated coarse aggregate surface, the region that regenerated coarse aggregate surface is weak serves the effect repaired and strengthen, enhance the interfacial transition zone between regenerated coarse aggregate and natural aggregate and sand-cement slurry, so that regeneration concrete ultimate compression strength is improved.
Embodiment
Cement in the embodiment of the present invention adopts Tangshan to produce east, P C32.5 Ji cement;
Natural fine aggregate is the common river sand of particle diameter < 4.75mm, and fineness modulus is the middle sand of 2.57;
Natural coarse aggregate is the rubble of continuous grading, and particle size range is 4.75-25mm;
Regenerated coarse aggregate is solid waste jaw crushing crusher machine, in the requirement becoming to meet 4.75 ~ 25mm continuous grading through screening assembly; The ultimate compression strength of Original concrete is between C20 ~ C30;
It is ordinary tap water that regeneration concrete mixes conjunction with maintenance water.
Use the relevant technical indicator of coarse aggregate in table 1.
Table 1 coarse aggregate technical indicator
Test specimen testing laboratory makes, and sample dimensions is the cubes of 150mm �� 150mm �� 150mm, specimen molding forced mixer spice, shaking table jolt ramming, and specimen molding carries out compressive strength test after maintenance to 28d after the 24h demoulding under mark supports condition. The mechanical property of regeneration concrete is tested according to GB/T50081-2002 " normal concrete mechanical test method standard ".
Embodiment 1
Change a method for stirring technique intensifying regenerating aggregate concrete, carry out according to following step:
(1) by solid waste jaw crushing crusher machine, through regenerated coarse aggregate screening assembly and become to meet the requirement of 4.75 ~ 25mm continuous grading;
(2) cement and 50% water being mixed, stir 30s, add regenerated coarse aggregate, stir 30s, then add natural thick, fine aggregate stirring 30s, water stirs 30s finally to add 50%, and in whole process, various materials are cement 327Kg/m3, water 180Kg/m3, coarse aggregate 1208Kg/m3, fine aggregate 651Kg/m3, wherein natural coarse aggregate is 906Kg/m3, regenerated coarse aggregate is 302Kg/m3; The slump is surveyed in discharging, makes test block.
Concrete performance comparison prepared by prepared C20-RN25 concrete and the conventional stirring means of identical material is shown in Table 2. Finding out by table 2, the C20-RN25 concrete crushing strength prepared by the present invention is obviously higher than the C20-RN25 prepared by conventional stirring means.
The proportioning design of table 2 regeneration concrete and intensity
Embodiment 2
Change a method for stirring technique intensifying regenerating aggregate concrete, carry out according to following step:
(1) by solid waste jaw crushing crusher machine, through regenerated coarse aggregate screening assembly and become to meet the requirement of 4.75 ~ 25mm continuous grading;
(2) cement and 50% water being mixed, stir 30s, add regenerated coarse aggregate, stir 30s, then add natural coarse-fine aggregate stirring 30s, water stirs 30s finally to add 50%, and in whole process, various materials are cement 327Kg/m3, water 180Kg/m3, coarse aggregate 1208Kg/m3, fine aggregate 651Kg/m3, wherein natural coarse aggregate is 604Kg/m3, regenerated coarse aggregate is 604Kg/m3; The slump is surveyed in discharging, makes test block.
Concrete performance comparison prepared by prepared C20-RN50 concrete and the conventional stirring means of identical material is shown in Table 2. Finding out by table 2, the concrete crushing strength of C20-RN50 prepared by the present invention is obviously higher than the C20-RN50 prepared by conventional stirring means.
Embodiment 3
Change a method for stirring technique intensifying regenerating aggregate concrete, carry out according to following step:
(1) by solid waste jaw crushing crusher machine, through regenerated coarse aggregate screening assembly and become to meet the requirement of 4.75 ~ 25mm continuous grading;
(2) cement and 50% water being mixed, stir 30s, add regenerated coarse aggregate, stir 30s, then add natural coarse-fine aggregate stirring 30s, water stirs 30s finally to add 50%, and in whole process, various materials are cement 327Kg/m3, water 180Kg/m3, coarse aggregate 1208Kg/m3, fine aggregate 651Kg/m3, wherein natural coarse aggregate is 0Kg/m3, regenerated coarse aggregate is 1208Kg/m3; The slump is surveyed in discharging, makes test block.
Concrete performance comparison prepared by prepared C20-RN100 concrete and the conventional stirring means of identical material is shown in Table 2. Finding out by table 2, the concrete crushing strength of C20-RN100 prepared by the present invention is obviously higher than the C20-RN100 prepared by conventional stirring means.
Embodiment 4
Change a method for stirring technique intensifying regenerating aggregate concrete, carry out according to following step:
(1) by solid waste jaw crushing crusher machine, through regenerated coarse aggregate screening assembly and become to meet the requirement of 4.75 ~ 25mm continuous grading;
(2) cement and 50% water being mixed, stir 30s, add regenerated coarse aggregate, stir 30s, then add natural coarse-fine aggregate stirring 30s, water stirs 30s finally to add 50%, and in whole process, various materials are cement 439Kg/m3, water 180Kg/m3, coarse aggregate 1147Kg/m3, fine aggregate 617Kg/m3, wherein natural coarse aggregate is 860Kg/m3, regenerated coarse aggregate is 287Kg/m3; The slump is surveyed in discharging, makes test block.
Concrete performance comparison prepared by prepared C30-RN25 concrete and the conventional stirring means of identical material is shown in Table 2. Finding out by table 2, the concrete crushing strength of C30-RN25 prepared by the present invention is obviously higher than the C30-RN25 prepared by conventional stirring means.
Embodiment 5
Change a method for stirring technique intensifying regenerating aggregate concrete, carry out according to following step:
(1) by solid waste jaw crushing crusher machine, through regenerated coarse aggregate screening assembly and become to meet the requirement of 4.75 ~ 25mm continuous grading;
(2) cement and 50% water being mixed, stir 30s, add regenerated coarse aggregate, stir 30s, then add natural coarse-fine aggregate stirring 30s, water stirs 30s finally to add 50%, and in whole process, various materials are cement 439Kg/m3, water 180Kg/m3, coarse aggregate 1130Kg/m3, fine aggregate 617Kg/m3, wherein natural coarse aggregate is 573Kg/m3, regenerated coarse aggregate is 573Kg/m3; The slump is surveyed in discharging, makes test block.
Concrete performance comparison prepared by prepared C30-RN50 concrete and the conventional stirring means of identical material is shown in Table 2. Finding out by table 2, the concrete crushing strength of C30-RN50 prepared by the present invention is obviously higher than the C30-RN50 prepared by conventional stirring means.
Embodiment 6
Change a method for stirring technique intensifying regenerating aggregate concrete, carry out according to following step:
(1) by solid waste jaw crushing crusher machine, through regenerated coarse aggregate screening assembly and become to meet the requirement of 4.75 ~ 25mm continuous grading;
(2) cement and 50% water being mixed, stir 30s, add regenerated coarse aggregate, stir 30s, then add natural coarse-fine aggregate stirring 30s, water stirs 30s finally to add 50%, and in whole process, various materials are cement 439Kg/m3, water 180Kg/m3, coarse aggregate 1146Kg/m3, fine aggregate 617Kg/m3, wherein natural coarse aggregate is 0Kg/m3, regenerated coarse aggregate is 1146Kg/m3; The slump is surveyed in discharging, makes test block.
Concrete performance comparison prepared by prepared C30-RN100 concrete and the conventional stirring means of identical material is shown in Table 2. Finding out by table 2, the concrete crushing strength of C30-RN100 prepared by the present invention is obviously higher than the C30-RN100 prepared by conventional stirring means.
Embodiment 7
Change a method for stirring technique intensifying regenerating aggregate concrete, carry out according to following step:
(1) by solid waste jaw crushing crusher machine, through regenerated coarse aggregate screening assembly and become to meet the requirement of 4.75 ~ 25mm continuous grading;
(2) cement and 50% water are mixed, stir 60s, add regenerated coarse aggregate, stir 60s, add natural coarse-fine aggregate again and stir 60s, water stirs 60s finally to add 50%, and in whole process, the mass ratio of various materials is cement: water: fine aggregate: coarse aggregate=1:0.4:1.05:1.81, wherein natural coarse aggregate: the mass ratio of regenerated coarse aggregate is 1:1; The slump is surveyed in discharging, makes test block.
Concrete crushing strength prepared by the present invention is obviously higher than prepared by conventional stirring means after testing.
Embodiment 8
Change a method for stirring technique intensifying regenerating aggregate concrete, carry out according to following step:
(1) by solid waste jaw crushing crusher machine, through regenerated coarse aggregate screening assembly and become to meet the requirement of 4.75 ~ 25mm continuous grading;
(2) cement and 50% water are mixed, stir 45s, add regenerated coarse aggregate, stir 45s, add natural coarse-fine aggregate again and stir 45s, water stirs 45s finally to add 50%, and in whole process, the mass ratio of various materials is cement: water: fine aggregate: coarse aggregate=1:0.7:3.76:3.98, wherein natural coarse aggregate: the mass ratio of regenerated coarse aggregate is 1:1; The slump is surveyed in discharging, makes test block.
Concrete crushing strength prepared by the present invention is obviously higher than prepared by conventional stirring means after testing.
Claims (1)
1. one kind changes the method for stirring technique intensifying regenerating aggregate concrete, it is characterised in that carry out according to following step:
(1) by solid waste jaw crushing crusher machine, the regenerated coarse aggregate becoming to meet the requirement of 4.75 ~ 25mm continuous grading again through screening assembly;
(2) by 50% water mixing of cement and total water consumption, stirring 30s, add regenerated coarse aggregate, stir 30s, then add natural thick, fine aggregate stirring 30s, the water finally adding residue 50% stirs 30s, and the slump is surveyed in discharging, makes test block; In whole process, various materials are cement 327kg/m3, water 180kg/m3, coarse aggregate 1208kg/m3, fine aggregate 651kg/m3; Wherein natural coarse aggregate is 906kg/m3, regenerated coarse aggregate is 302kg/m3; The slump is surveyed in discharging, makes test block;
Described cement adopts Tangshan to produce east, P C32.5 Ji cement; Natural fine aggregate is the common river sand of particle diameter < 4.75mm, and fineness modulus is the middle sand of 2.57; Natural coarse aggregate is the rubble of continuous grading, and particle size range is 4.75-25mm; Regenerated coarse aggregate is solid waste jaw crushing crusher machine, in the requirement becoming to meet 4.75 ~ 25mm continuous grading through screening assembly; The ultimate compression strength of Original concrete is between C20 ~ C30; It is ordinary tap water that regeneration concrete mixes conjunction with maintenance water; The test block 28d ultimate compression strength 26.4MPa obtained.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104276775B (en) * | 2014-07-08 | 2016-03-30 | 北京东方建宇混凝土科学技术研究院有限公司 | A kind of grading evaluation system of low-quality regeneration aggregate |
| CN104591656A (en) * | 2015-02-13 | 2015-05-06 | 福建江夏学院 | Low-drying shrinkage high-performance recycled concrete |
| CN104628344A (en) * | 2015-02-13 | 2015-05-20 | 福建江夏学院 | Low-autogenous shrinkage and high-performance recycled concrete |
| CN104628343A (en) * | 2015-02-13 | 2015-05-20 | 福州大学 | Low-compression creep and high-performance recycled concrete |
| CN105130299A (en) * | 2015-08-20 | 2015-12-09 | 浙江工业大学 | In-situ reinforcement method of recycled aggregate |
| CN105601185A (en) * | 2015-12-24 | 2016-05-25 | 哈尔滨工业大学 | Plant fiber recycled concrete block and preparation method thereof |
| CN108191281B (en) * | 2017-12-29 | 2020-12-25 | 石家庄铁道大学 | Recycled aggregate concrete interface transition zone strengthening method |
| CN109081644B (en) * | 2018-09-21 | 2021-04-02 | 赵世红 | Treatment method for recycling waste plastics |
| CN111423168A (en) * | 2020-04-08 | 2020-07-17 | 南京鹿晶混凝土有限公司 | Process for preparing high-performance composite concrete from mineral powder, machine-made sand and waste concrete |
| CN111875309A (en) * | 2020-06-22 | 2020-11-03 | 浙江二十冶建设有限公司 | Recycled concrete and preparation method and application thereof |
| CN114133183A (en) * | 2021-12-06 | 2022-03-04 | 惠州森洛克材料科技有限公司 | Concrete with fully recycled aggregate and preparation method thereof |
| CN115259714A (en) * | 2022-05-12 | 2022-11-01 | 保利长大工程有限公司 | Recycling method of waste concrete solid waste |
| CN115124317B (en) * | 2022-07-14 | 2023-09-26 | 武汉工程大学 | Composite activated regenerated micro-powder concrete based on slurry wrapping process and preparation method thereof |
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| CN100369855C (en) * | 2006-11-14 | 2008-02-20 | 王军龙 | Regenerated cement concrete for pavement and its preparing process |
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