CN104844256A - Foaming regenerating concrete self-thermal-insulation material and preparation method thereof - Google Patents
Foaming regenerating concrete self-thermal-insulation material and preparation method thereof Download PDFInfo
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- CN104844256A CN104844256A CN201510180395.2A CN201510180395A CN104844256A CN 104844256 A CN104844256 A CN 104844256A CN 201510180395 A CN201510180395 A CN 201510180395A CN 104844256 A CN104844256 A CN 104844256A
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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
According to the present invention, the concrete foaming technology and the regenerating concrete technology are combined, the natural aggregate is not consumed, and the coarse and fine aggregates obtained after crushing waste concrete and the difficultly-recycled powder are completely utilized to prepare the regenerating concrete self-thermal-insulation material, wherein not more than 2% by mass of a foaming agent, 2-10% by mass of vitrified micro-beads, 12-20% by mass of cement, 12-18% by mass of recycled fine aggregate, 40-60% by mass of recycled coarse aggregate, 1-5% by mass of fly ash, 0.1-0.5% by mass of a water reducing agent, 6-12% by mass of water and other materials are used to prepare the self-thermal-insulation material; and the foaming regenerating concrete self-thermal-insulation material has the following characteristics that: the apparent density is low and is 1600-2100 kg/m<3>, the 28 d compressive strength is 20-40 MPa, the thermal insulation property is excellent, the thermal conductivity coefficient is 0.8-1.2 [W/(m.K)], and the value can be increased by 40-50% compared with the ordinary concrete material having the same strength, and is reduced by 20% compared with the natural aggregate foaming concrete material having the same ratio.
Description
Technical field
The invention belongs to material of construction preparation field, be specifically related to a kind of foaming regeneration concrete self-thermal insulation material and preparation method thereof.
Background technology
China is concrete production maximum in the world and consumer nation, annual concrete consumption about 13 ~ 14 billion cubic meter consumed, and the especially natural sandstone produced quantity of concrete raw material is large, and within 2013, concrete consumes natural aggregate more than 10,000,000,000 tons.While natural resources sharply consumes, cause physical environment by destruction in various degree.On the other hand, according to " Chinese Resources comprehensive utilization annual report (2014) " that National Development and Reform Commission issues, within 2013, China's building castoff generation is about 1,000,000,000 tons, and wherein discarded concrete accounts for 34%, and with every year on average 8% amount increase, expect the year two thousand twenty and will reach 6.38 hundred million tons.And China's building castoff resource utilization rate is only 5%.Discarded concrete is processed into regeneration aggregate through fragmentation and is applied to regeneration concrete, save a large amount of processing costss on the one hand, reduce discarded concrete quantity discharged simultaneously, thus reduce the secondary pollution that environment is caused.
Compared with natural aggregate, regeneration aggregate intensity is low, porosity is large, water-intake rate is high, newly mixes regeneration concrete water cement ratio and increases, and causes its serviceability and Young's modulus to reduce, shrinkage and creep increases, and therefore various countries are applied to building structure to regeneration concrete and still hold the prudent attitude.But regeneration concrete is applied to non-stress structure, as adopted, vibration-extrusion is molded does the building block of regeneration concrete external wall, these structures are less demanding to concrete slump, less water consumption is only needed to meet the demands, effectively can avoid the defect of the aspects such as Workability of Regenerated Concrete, take full advantage of again the little advantage of regeneration concrete heat transfer coefficient simultaneously.In addition the Replacement rate of regeneration aggregate can also significantly be improved, make full use of recycled fine aggregate, even can utilize the powder in regeneration aggregate shattering process completely, save complicated to sieve, clean, interface pre-treatment supervisor, Simplified flowsheet to a great extent, reduces costs, and saves water and energy, that carries out building block prefabricatedly to avoid in cast-in-place structural because regeneration concrete volume stability is not good simultaneously, causes problems of crack under constrained conditions.
In addition, China's existing building about 40,000,000,000 square metres, the overwhelming majority belongs to high energy consumption building, and " energy saving building ", less than 5%, building energy consumption accounts for 33% of total energy consumption.In building energy consumption, the heat consump-tion in transfer of building enclosure accounts for 2/3 of total heat consumption, and architectural exterior-protecting construction thermal conductivity height is the one of the main reasons that building energy consumption is large, and the heat transfer coefficient reducing exterior wall is the key of building energy conservation.The way of the common exterior-wall heat insulation of current China has three kinds, i.e. external wall heat insulation system, exterior wall internal insulation system, outer wall self heat-preserving system.Wherein outer wall self heat-preserving system economical with it, construct simple, pollution-free, can not extraneous risks be introduced, thus become the most potential method.
For above problem, concrete foaming technique combines with recycled concrete by the present invention, what utilize after discarded concrete fragmentation completely is thick, fine aggregate and the powder being difficult to regeneration prepare highly efficient regeneration concrete self-insulating material, utilize regenerated aggregate concrete thermal conductivity lower than the feature of normal concrete on the one hand, on the other hand regeneration aggregate is used for nonweight-bearing walling unit, regeneration aggregate treatment process can be simplified to a great extent, discarded concrete is at utmost utilized to solve environmental issue, there is good economic benefit, social benefit and environmental benefit.
Summary of the invention
The object of the invention is to, the problem such as contaminate environment, energy scarcity low for existing discarded concrete utilization ratio, regeneration aggregate is made by after its fragmentation, screening, natural aggregate is substituted with regeneration aggregate, and in conjunction with the obtained a kind of foaming regeneration concrete self-thermal insulation material of foaming technique.This material thermal and insulating performance is excellent, and thermal conductivity is 0.8 ~ 1.2 [W/ (mK)], and its value reduces 40%-50% than with intensity common concrete material, reduces by 20% than same proportioning natural aggregate foam concrete material.
For achieving the above object, following technical scheme is adopted:
A kind of foaming regeneration concrete self-thermal insulation material; containing following raw material; to account for the percentages of whole raw material quality: whipping agent 1%-2%, glass bead 2%-10%; cement 12%-20%, recycled fine aggregate 12%-18%, regenerated coarse aggregate 40%-60%, flyash 1%-5%, water reducer 0.1%-0.1% and water 6%-12%, above each raw materials quality percentage ratio sum is 100%.
2 grating district requirements of regulation during described recycled fine aggregate grain composition meets " concrete and mortar recycled fine aggregate " (GB/T 25176-2010).
Described foaming regeneration concrete self-thermal insulation material: substitute natural aggregate with recycled fine aggregate, substitution rate is 100%.
Described cement is silicate cement or ordinary Portland cement.
Described recycled fine aggregate is without the need to washing or sieve, and utilizes in the lump together with powder; In recycled fine aggregate, powder content reaches 9 wt%; Described powder is the particle of the particle diameter≤0.15mm produced in regeneration aggregate shattering process.
One prepares foaming regeneration concrete self-thermal insulation material as above, comprises the following steps:
1) by account within whole raw material quality per-cent 2% whipping agent, 0%-10% glass bead, the water of the regenerated coarse aggregate of the cement of 12%-20%, 12%-18 recycled fine aggregate, 40%-60%, the flyash of 0%-5%, the water reducer of 0%-0.1% and 6%-12%, mixing and stirring, obtains concrete mix;
2) mixed material prepared in step 1) is poured into mould, maintenance obtains regeneration concrete self-thermal insulation material.
The application of foaming regeneration concrete self-thermal insulation material as above: for self-thermal insulation wall building block.
beneficial effect:
Compared with prior art, tool of the present invention has the following advantages:
1, the present invention utilizes the obtained regeneration aggregate of discarded concrete to replace natural aggregate completely, and the recycling utilization for discarded concrete provides a kind of approach, facilitates the regeneration of resource, is conducive to protection of the environment again simultaneously;
2, the present invention makes full use of the low advantage of recycled fine aggregate thermal conductivity, is made into regeneration concrete self-thermal insulation material, and this material is used for the external wall heat insulation building block of non-stress structure, and self-heat conserving is effective;
3, the recycled fine aggregate in the present invention need not through techniques such as washing, screenings, powder wherein can use in the lump, to a great extent Simplified flowsheet, can save a large amount of human and material resources, reducing the production cost of self-thermal insulation material, is a kind of economical and practical method;
4, by foaming technique, in conjunction with materials such as glass beads, make the foaming regeneration concrete of low unit weight, its apparent density is 1600-2100kg/m
3, 28d ultimate compression strength is 20-40 MPa, and thermal conductivity is 0.8-1.2 W/ (mK), has good fire protection flame retarding and thermal and insulating performance.
Accompanying drawing explanation
Fig. 1 regenerates the change of self-insulating concrete intensity whipping agent volume;
Fig. 2 regenerates heat insulation building block thermal conductivity with the change of whipping agent volume and to contrast with normal concrete.
Embodiment
The present invention's the following example further illustrates the present invention, but protection scope of the present invention is not limited to the following example.Below by embodiment, the present invention is described in more detail.
1, starting material used in embodiment
(1) regenerated coarse aggregate:
Test regenerated coarse aggregate performance according to " the reinforcement of concrete regenerated coarse aggregate " (GB/T 25177-2010) code requirement, test result is as shown in table 1.
Table 1 regenerated coarse aggregate various aspects of performance index
(2) recycled fine aggregate:
Carry out size analysis according to " concrete and mortar recycled fine aggregate " (GB/T 25176-2010) code requirement to recycled fine aggregate, screening result is as shown in table 2; As shown in Table 2, recycled fine aggregate grain composition meets 2 grating district requirements of regulation in " concrete and mortar recycled fine aggregate " (GB/T 25176-2010).
Table 2 recycled fine aggregate grain composition
As can be seen from Table 2, in recycled fine aggregate, particle (i.e. regenerated powder) quality of particle diameter≤below 0.15mm accounts for recycled fine aggregate quality 7%; In regenerated powder, particle diameter > 0.075mm granular mass accounts for regenerated powder quality 80%.Regenerated powder is primarily of the powder constituent of petrifying water mudstone and sandstone aggregate chip, and after tested, regenerated powder chemical composition is as shown in table 3.
Table 3 regenerated powder chemical composition (%)
Test recycled fine aggregate each side index according to " concrete and mortar recycled fine aggregate " (GB/T 25176-2010) code requirement, test result is as shown in table 4 below.
Table 4 recycled fine aggregate various aspects of performance index
(3) cement:
For refining Stone steles 42.5 ordinary Portland cement of Deposit in Shunchang, Fujian Province manufacture of cement; The physicals of cement is in table 5, and chemical property is in table 6.
The physicals of table 5 cement
The chemical composition (%) of table 6 cement
(4) flyash:
The flyash testing employing is herein II level flyash; The physicals of flyash is in table 7, and chemical composition is in table 8.
The physicals of table 7 flyash
The chemical composition (%) of table 8 flyash
(5) water reducer
The high-efficiency water-reducing agent of poly-carboxylic acid of Xiamen Ke Zhijie company.
(6) glass bead
Glass bead properties is in table 9.
Table 9 glass bead physicals
Comparative example 1(D1)
(1) proportioning
Raw material: the glass bead of 3.75 kg/m3, the cement of 10.8 kg/m3, the regenerated coarse aggregate of 36 kg/m3, the recycled fine aggregate of 9 kg/m3, the whipping agent of 0 kg/m3, the flyash of 2.7 kg/m3, the water reducer of 0.25 kg/m3 and the water of 6.75 kg/m3;
(2) preparation method:
1) by glass bead, cement, regeneration aggregate, flyash, water reducer and water mixing and stirring, concrete mix is obtained;
2) concrete mix prepared in step 1) is poured into mould, maintenance obtains foaming regeneration concrete self-thermal insulation material;
(3) result of implementation
Obtain good water-retaining property after stirring, the slump is 0-3 mm, workability meets the regeneration concrete mixture of building block manufacturing technique requirent; Recycled concrete block is obtained after maintenance.
In order to test implementation effect, the apparent density of concrete self-insulating material, thermal conductivity are tested, and contrasted with normal concrete.Determination of conductive coefficients adopts German Nai Chi company to produce HFM436/3/1E heat flow method conductometer and external member, compare through investigation, this instrument can avoid current many concrete heat conduction coefficient tester device poor repeatability, the problem that test result confidence level is not high, there is easy handling, measuring result is accurate, the advantages such as measuring speed is fast.
Find after tested, under the prerequisite without foaming, the recycled concrete block of thermal conductivity ratio normal concrete low 28% can be obtained.
Embodiment 1(S1)
(1) proportioning
The glass bead of 3.75 kg/m3, the cement of 10.8 kg/m3, the regenerated coarse aggregate of 36 kg/m3, the recycled fine aggregate of 9 kg/m3, the flyash of 2.7 kg/m3, the whipping agent of 0.21 kg/m3, the water reducer of 0.14 kg/m3 and the water of 6.75 kg/m3.
(2) preparation method:
1) by glass bead, cement, regeneration aggregate, flyash, water reducer and water mixing and stirring, concrete mix is obtained;
2) pour into after whipping agent being added Water blown in mixed material, obtain the concrete mix that serviceability is good;
3) concrete mix prepared in step 1) is poured into mould, maintenance obtains foaming regeneration concrete self-thermal insulation material;
(3) result of implementation
Obtain good water-retaining property after stirring, the slump is 0-3mm, workability meets the regeneration concrete mixture of building block manufacturing technique requirent; When admixture trace whipping agent (0.3%), after maintenance, obtain that apparent density is low, the recycled concrete block of thermal conductivity ratio normal concrete low 37%.
Embodiment 2(S2)
(1) proportioning
The glass bead of 3.75 kg/m3, the cement of 10.8 kg/m3, the regenerated coarse aggregate of 36 kg/m3, the recycled fine aggregate of 9 kg/m3, the flyash of 2.7 kg/m3, the whipping agent of 0.42 kg/m3, the water reducer of 0.05 kg/m3 and the water of 6.75 kg/m3.
(2) preparation method is with embodiment 1
(3) result of implementation
Obtain good water-retaining property after stirring, the slump is 0-3mm, workability meets the regeneration concrete mixture of building block manufacturing technique requirent; Obtain after maintenance when admixture 0.6% whipping agent that apparent density is low, the recycled concrete block of thermal conductivity ratio normal concrete low 41%.
Embodiment 3(S3)
(1) proportioning
The glass bead of 3.75 kg/m3, the cement of 10.8 kg/m3, the regenerated coarse aggregate of 36 kg/m3, the recycled fine aggregate of 9 kg/m3, the flyash of 2.7 kg/m3, the whipping agent of 0.63 kg/m3 and the water of 6.75 kg/m3.
(2) preparation method is with embodiment 1
(3) result of implementation
Obtain good water-retaining property after stirring, the slump is 0-3mm, workability meets the regeneration concrete mixture of building block manufacturing technique requirent; During admixture 0.9% whipping agent, after maintenance, obtain that apparent density is low, the recycled concrete block of thermal conductivity ratio normal concrete low 44%.
Each group of embodiment the results are summarized in table 10.Thermal conductivity is shown in Fig. 1 with the change of whipping agent volume, and ultimate compression strength is shown in Fig. 2 with the change of whipping agent volume, and as seen along with the increase of whipping agent volume, concrete material thermal conductivity has the trend decreased.According to actual needs, the volume of whipping agent can also be adjusted further, thus reach the object reducing thermal conductivity further.
Table 10 is group embodiment test-results respectively
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (8)
1. a foaming regeneration concrete self-thermal insulation material; it is characterized in that: described self-thermal insulation material contains following raw material; to account for the percentages of whole raw material quality: whipping agent 1%-2%, glass bead 2%-10%; cement 12%-20%, recycled fine aggregate 12%-18%, regenerated coarse aggregate 40%-60%, flyash 1%-5%, water reducer 0.1%-0.5% and water 6%-12%, above each raw materials quality percentage ratio sum is 100%.
2. foaming regeneration concrete self-thermal insulation material according to claim 1, is characterized in that: requirement that described recycled fine aggregate meets " concrete and mortar recycled fine aggregate " (GB/T 25176-2010).
3. foaming regeneration concrete self-thermal insulation material according to claim 1, is characterized in that: substitute natural fine aggregate with recycled fine aggregate, and substitution rate is 100%.
4. foaming regeneration concrete self-thermal insulation material according to claim 1, is characterized in that: described regenerated coarse aggregate meets " the reinforcement of concrete regenerated coarse aggregate " (GB/T 25177-2010) requirement.
5. foaming regeneration concrete self-thermal insulation material according to claim 1, is characterized in that: substitute natural coarse aggregate completely with regenerated coarse aggregate, substitution rate is 100%.
6. foaming regeneration concrete self-thermal insulation material according to claim 1, is characterized in that: described cement is silicate cement or ordinary Portland cement.
7. foaming regeneration concrete self-thermal insulation material according to claim 1, is characterized in that: described recycled fine aggregate is without the need to washing or sieve, and utilizes in the lump together with powder; In recycled fine aggregate, powder content reaches 9 wt%; Described powder is the particle of the particle diameter≤0.15mm produced in regeneration aggregate shattering process.
8. an application for foaming regeneration concrete self-thermal insulation material as claimed in claim 1, is characterized in that: for self-thermal insulation wall building block.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105330206A (en) * | 2015-10-21 | 2016-02-17 | 南京梅山海强新型建材有限公司 | Non-bearing recycled fine aggregate concrete perforated brick |
| CN106186954A (en) * | 2016-07-18 | 2016-12-07 | 江苏中铁奥莱特新材料股份有限公司 | A kind of novel high-strength type foam concrete and preparation method thereof |
| CN106630832A (en) * | 2016-12-18 | 2017-05-10 | 余姚市庆达机械有限公司 | Environment-friendly building material with high strength and preparation method thereof |
| CN106746958A (en) * | 2016-11-25 | 2017-05-31 | 四川菱通智能环保产业有限公司 | The preparation method that hollow concrete is laid bricks is prepared using discarded concrete |
| CN106830869A (en) * | 2017-03-27 | 2017-06-13 | 合肥智慧龙图腾知识产权股份有限公司 | A kind of concrete of high intensity and preparation method thereof |
| CN106830846A (en) * | 2017-03-09 | 2017-06-13 | 太原理工大学 | Basalt fibre regeneration thermal insulation concrete and preparation method thereof |
| CN106830786A (en) * | 2016-12-30 | 2017-06-13 | 苏州麦垛信息科技有限公司 | A kind of environment-friendly and energy-efficient foamed concrete |
| CN108623243A (en) * | 2017-03-20 | 2018-10-09 | 上海天利商品混凝土有限公司 | A kind of flame-retardant high-strength foam concrete and preparation method |
| CN108863268A (en) * | 2018-07-20 | 2018-11-23 | 思力佳特种环保材料（深圳）有限公司 | A kind of regeneration activity material based on building waste, preparation method and non-evaporating foamed bricks |
| CN110818357A (en) * | 2019-12-03 | 2020-02-21 | 浙江大学 | Waterproof anti-cracking fully-recycled aggregate foam building block based on macro-micro dual-pore structure and preparation method thereof |
| CN113135703A (en) * | 2021-05-20 | 2021-07-20 | 武汉华强新型建筑材料有限公司 | High-strength recycled concrete and preparation method thereof |
| CN113149580A (en) * | 2021-05-10 | 2021-07-23 | 上海建工建材科技集团股份有限公司 | Regenerated foam concrete and preparation method thereof |
| CN114213150A (en) * | 2022-01-05 | 2022-03-22 | 上海市地江建筑科技有限公司 | Novel energy-saving environment-friendly foam light soil and preparation method thereof |
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2015
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105330206A (en) * | 2015-10-21 | 2016-02-17 | 南京梅山海强新型建材有限公司 | Non-bearing recycled fine aggregate concrete perforated brick |
| CN106186954A (en) * | 2016-07-18 | 2016-12-07 | 江苏中铁奥莱特新材料股份有限公司 | A kind of novel high-strength type foam concrete and preparation method thereof |
| CN106746958B (en) * | 2016-11-25 | 2018-12-21 | 四川菱通智能环保产业有限公司 | The preparation method that hollow concrete is laid bricks is prepared using discarded concrete |
| CN106746958A (en) * | 2016-11-25 | 2017-05-31 | 四川菱通智能环保产业有限公司 | The preparation method that hollow concrete is laid bricks is prepared using discarded concrete |
| CN106630832A (en) * | 2016-12-18 | 2017-05-10 | 余姚市庆达机械有限公司 | Environment-friendly building material with high strength and preparation method thereof |
| CN106830786A (en) * | 2016-12-30 | 2017-06-13 | 苏州麦垛信息科技有限公司 | A kind of environment-friendly and energy-efficient foamed concrete |
| CN106830846A (en) * | 2017-03-09 | 2017-06-13 | 太原理工大学 | Basalt fibre regeneration thermal insulation concrete and preparation method thereof |
| CN108623243A (en) * | 2017-03-20 | 2018-10-09 | 上海天利商品混凝土有限公司 | A kind of flame-retardant high-strength foam concrete and preparation method |
| CN106830869A (en) * | 2017-03-27 | 2017-06-13 | 合肥智慧龙图腾知识产权股份有限公司 | A kind of concrete of high intensity and preparation method thereof |
| CN108863268A (en) * | 2018-07-20 | 2018-11-23 | 思力佳特种环保材料（深圳）有限公司 | A kind of regeneration activity material based on building waste, preparation method and non-evaporating foamed bricks |
| CN110818357A (en) * | 2019-12-03 | 2020-02-21 | 浙江大学 | Waterproof anti-cracking fully-recycled aggregate foam building block based on macro-micro dual-pore structure and preparation method thereof |
| CN113149580A (en) * | 2021-05-10 | 2021-07-23 | 上海建工建材科技集团股份有限公司 | Regenerated foam concrete and preparation method thereof |
| CN113135703A (en) * | 2021-05-20 | 2021-07-20 | 武汉华强新型建筑材料有限公司 | High-strength recycled concrete and preparation method thereof |
| CN114213150A (en) * | 2022-01-05 | 2022-03-22 | 上海市地江建筑科技有限公司 | Novel energy-saving environment-friendly foam light soil and preparation method thereof |
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Application publication date: 20150819 |