CN113845340A - Low-strength fluidity backfill material prepared by utilizing construction waste and preparation method thereof - Google Patents
Low-strength fluidity backfill material prepared by utilizing construction waste and preparation method thereof Download PDFInfo
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- CN113845340A CN113845340A CN202010598444.5A CN202010598444A CN113845340A CN 113845340 A CN113845340 A CN 113845340A CN 202010598444 A CN202010598444 A CN 202010598444A CN 113845340 A CN113845340 A CN 113845340A
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- China
- Prior art keywords
- construction waste
- low
- backfill material
- strength
- fluidity
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- 239000002699 waste material Substances 0.000 title claims abstract description 43
- 238000010276 construction Methods 0.000 title claims abstract description 40
- 239000000463 material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000004568 cement Substances 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 15
- 230000000996 additive effect Effects 0.000 claims abstract description 14
- 239000010881 fly ash Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 10
- 239000004575 stone Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 10
- 230000009969 flowable effect Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000005056 compaction Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 7
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000001303 quality assessment method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A backfill material with low-strength fluidity prepared by utilizing construction waste and a preparation method thereof are characterized by comprising water, cement, stone powder, fly ash, recycled fine aggregate and an additive. The construction waste fluidizing backfill material provided by the invention is a low-strength cement material, has the 28d compressive strength of 2-8MPa, and has the characteristics of self-compaction, environmental protection, economy, adjustable strength and the like.
Description
Technical Field
The invention relates to a low-strength fluidity backfill material prepared by utilizing construction waste and a preparation method thereof.
Background
Construction waste is solid waste generated during the process of building construction, reconstruction, extension or demolition. According to different generation sources of the construction waste, the construction waste and the demolished construction waste can be divided. The construction waste is solid waste generated in new construction, reconstruction or extension projects, and the demolition construction waste is construction waste generated in demolition and demolition of buildings. The construction waste has a wide erosion effect on our living environment, and if the construction waste is not reasonably treated and disposed, the construction waste will have adverse effects on urban environmental sanitation, living conditions, land quality assessment and the like. Firstly, after a large amount of construction waste is piled in the land, the quality of the soil can be reduced, and the production capacity of the soil is reduced; the construction waste is stacked in the air, so that the air quality is influenced, and some dust particles can be suspended in the air and are harmful to the health of human bodies; during the stacking process of the construction waste, the harmful substances of the construction waste permeate into the underground water area after being stacked for a long time, so that the water environment is polluted; the building garbage is piled up in the city, which is unfavorable for the urban environment and the attractiveness; the building rubbish stacking may have some potential safety hazards, and some accidents may happen at any time. In order to solve the problems, the construction waste is secondarily developed and utilized, and the problem of environmental pollution of the construction waste is effectively solved.
Disclosure of Invention
The invention aims to provide a low-strength fluidity backfill material prepared by utilizing construction waste and a preparation method thereof, and the invention adopts the following technical scheme:
a low-strength fluidity backfill material prepared by utilizing construction waste is characterized by comprising water, cement, stone powder, fly ash, recycled fine aggregate and an additive;
the mass ratio of the cement, the stone powder, the fly ash and the recycled fine aggregate is (1-1.5): 2: 2: (18-25), the content of the additive is 1-3%, and the water-solid ratio of the low-strength flowing backfill material is 0.95
The content of the additive is 1-2%.
The cement is P.O 42.5.5 cement.
The particle size of the recycled fine aggregate is not more than 4.75 mm.
The admixture is selected from polycarboxylic acid type high-performance admixtures.
The preparation method for preparing the low-strength flowable backfill material prepared by using the construction waste is characterized by comprising the following steps of:
weighing each component;
step two, mixing and stirring cement, stone powder, fly ash and recycled fine aggregate for 30-100s, adding water and stirring for 100-200s to obtain a mixture;
and step three, adding the additive into the mixture prepared in the step two, and uniformly stirring.
And in the second step, the equipment adopted for stirring is a gravity type or forced type cement concrete mixer.
Has the advantages that:
the building waste fluidizing backfill material provided by the invention is a low-strength cement material, has the 28d compressive strength of 2-8MPa, has the characteristics of self-compaction, environmental protection, economy, adjustable strength and the like, and is suitable for backfilling roadbed pipeline grooves, the periphery of inspection wells, retaining wall backs, abutment backs and other parts.
Detailed Description
The invention will be further illustrated with reference to the following specific examples.
The invention relates to a low-strength fluidity backfill material prepared by utilizing construction waste and a preparation method thereof, which adopts the following technical scheme:
a low-strength fluidity backfill material prepared by utilizing construction waste is characterized by comprising water, cement, stone powder, fly ash, recycled fine aggregate and an additive;
the mass ratio of the cement, the stone powder, the fly ash and the recycled fine aggregate is (1-1.5): 2: 2: (18-25), the content of the additive is 1-3%, and the water-solid ratio of the low-strength flowing backfill material is 0.95
The content of the additive is 1-2%.
The cement is P.O 42.5.5 cement.
The particle size of the recycled fine aggregate is not more than 4.75 mm.
The admixture is selected from polycarboxylic acid type high-performance admixtures.
The preparation method for preparing the low-strength flowable backfill material prepared by using the construction waste is characterized by comprising the following steps of:
weighing each component;
step two, mixing and stirring cement, stone powder, fly ash and recycled fine aggregate for 30-100s, adding water and stirring for 100-200s to obtain a mixture;
and step three, adding the additive into the mixture prepared in the step two, and uniformly stirring.
And in the second step, the equipment adopted for stirring is a gravity type or forced type cement concrete mixer.
And (3) performance testing:
(1) and (3) measuring the unit volume mass (namely mass density) of the tamped mixture to determine the actual consumption of each component material in the building waste flowable low-strength backfill material mixture per cubic meter. The density of the construction waste low-fluidity and strong-strength backfill material prepared by the method is about 1950-3And test standard JGJ/T70 building mortar basic performance test method.
(2) And (3) setting time, namely determining the setting time of the building waste flowable low-strength backfill material mixture by using a penetration resistance method, and guiding the actual engineering. The setting time of the building waste low-fluidity and strong-strength backfill material prepared by the method is about 12 hours, and the test standard JGJ/T70 building mortar basic performance test method is adopted.
(3) The compressive strength refers to the strength limit when external force is applied. The compressive strength of the material is an important index for evaluating the practical engineering application of the material. The design strength of the construction waste fluidized backfill material is based on the compressive strength of 28-day age, and the design strength range is 2.0-8.0 MPa.
(4) The fluidity of the construction waste fluidity backfill material is a technical index which is measured by a specified test method and represents the fluidity performance of the construction waste fluidity backfill material, and the fluidity performance can be graded according to the fluidity index according to the construction requirement so as to guide the actual engineering. The fluidity of the building garbage flowing backfill material is determined according to the backfill engineering type, and the fluidity range is 100-300 mm. Test standard GBT2419 method for determining fluidity of cement mortar
(5) Slump and slump expansion, and workability of reactive concrete, and the test method meets the standard of the test method for the performance of common concrete mixtures GB/T50080. Through tests, the slump range of the building waste flowable backfill material prepared by the method can be controlled to be 250mm plus 180 mm according to construction requirements, and the slump expansion degree can be controlled to be 650mm plus 400 mm.
(6) Freeze-thaw resistance refers to the property of a material that can withstand multiple freeze-thaw cycles without failure and without significant loss of strength in a hydrated state. The freeze-thaw durability of the building waste flowable backfill material with the freeze-thaw resistance requirement is determined according to the standard requirement of the test standard JGJ/T70 building mortar basic performance test method. After the freeze-thaw cycle test, the mass loss rate is less than 5%, and the compressive strength loss rate is less than 15%.
It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (7)
1. A low-strength fluidity backfill material prepared by utilizing construction waste is characterized by comprising water, cement, stone powder, fly ash, recycled fine aggregate and an additive;
the mass ratio of the cement, the stone powder, the fly ash and the recycled fine aggregate is (1-1.5): 2: 2: (18-25), the content of the additive is 1-3%, and the water-solid ratio of the low-strength flowing backfill material is 0.95.
2. The low-strength fluidity backfill material prepared by using construction waste according to the claim 1, characterized in that the content of the additive is 1-2%.
3. The low-fluidity backfill material prepared by using the construction waste according to the claim 1, wherein the cement is P.O 42.5.5 cement.
4. The low-fluidity backfill material prepared by using construction waste according to the claim 1, characterized in that the recycled fine aggregate has a particle size not larger than 4.75 mm.
5. The low-strength flowable backfill material made by using construction waste according to claim 1, wherein the additive is selected from polycarboxylic acid type high performance additives.
6. A method for preparing the backfill material with low fluidity prepared by the construction waste according to any one of claims 1 to 5, characterized by comprising the following steps:
weighing each component;
step two, mixing and stirring cement, stone powder, fly ash and recycled fine aggregate for 30-100s, adding water and stirring for 100-200s to obtain a mixture;
and step three, adding the additive into the mixture prepared in the step two, and uniformly stirring.
7. The method of claim 6, wherein the equipment used for the stirring in step two is a gravity type or forced type cement concrete mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010598444.5A CN113845340A (en) | 2020-06-28 | 2020-06-28 | Low-strength fluidity backfill material prepared by utilizing construction waste and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010598444.5A CN113845340A (en) | 2020-06-28 | 2020-06-28 | Low-strength fluidity backfill material prepared by utilizing construction waste and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113845340A true CN113845340A (en) | 2021-12-28 |
Family
ID=78972089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010598444.5A Pending CN113845340A (en) | 2020-06-28 | 2020-06-28 | Low-strength fluidity backfill material prepared by utilizing construction waste and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113845340A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116283146A (en) * | 2023-03-15 | 2023-06-23 | 东南大学 | Controllable low-strength backfill material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08100177A (en) * | 1994-08-01 | 1996-04-16 | Yawata Kouro Concrete Kk | Construction and building composition for backfilling, etc. |
| CN103319121A (en) * | 2013-06-09 | 2013-09-25 | 北京工业大学 | Fluidic backfill material produced by building garbage fines and construction method |
| CN106830777A (en) * | 2016-12-19 | 2017-06-13 | 深圳广田集团股份有限公司 | Regeneration fill concrete and its application prepared by consumer waste incineration residue |
| CN108203270A (en) * | 2018-01-04 | 2018-06-26 | 北京建筑大学 | A kind of controllability low-intensity material |
| CN108264292A (en) * | 2018-01-04 | 2018-07-10 | 北京建筑大学 | A kind of controllable low strong material of building waste and its application |
-
2020
- 2020-06-28 CN CN202010598444.5A patent/CN113845340A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08100177A (en) * | 1994-08-01 | 1996-04-16 | Yawata Kouro Concrete Kk | Construction and building composition for backfilling, etc. |
| CN103319121A (en) * | 2013-06-09 | 2013-09-25 | 北京工业大学 | Fluidic backfill material produced by building garbage fines and construction method |
| CN106830777A (en) * | 2016-12-19 | 2017-06-13 | 深圳广田集团股份有限公司 | Regeneration fill concrete and its application prepared by consumer waste incineration residue |
| CN108203270A (en) * | 2018-01-04 | 2018-06-26 | 北京建筑大学 | A kind of controllability low-intensity material |
| CN108264292A (en) * | 2018-01-04 | 2018-07-10 | 北京建筑大学 | A kind of controllable low strong material of building waste and its application |
Non-Patent Citations (1)
| Title |
|---|
| 康烨等: "基于建筑垃圾细料的快硬回填料性能对比研究", 《中外公路》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116283146A (en) * | 2023-03-15 | 2023-06-23 | 东南大学 | Controllable low-strength backfill material |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20211228 |