CN115784685A - Recycled lightweight aggregate concrete and preparation process thereof - Google Patents
Recycled lightweight aggregate concrete and preparation process thereof Download PDFInfo
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- CN115784685A CN115784685A CN202211445879.1A CN202211445879A CN115784685A CN 115784685 A CN115784685 A CN 115784685A CN 202211445879 A CN202211445879 A CN 202211445879A CN 115784685 A CN115784685 A CN 115784685A
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- lightweight aggregate
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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
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Abstract
The invention discloses recycled lightweight aggregate concrete and a preparation process thereof, and belongs to the technical field of concrete processing. The recycled lightweight aggregate concrete comprises lightweight aggregate, powder, cement, fly ash, mineral powder, a water reducing agent and water. The lightweight aggregate comprises construction waste recycled lightweight aggregate with the particle size of 0.16-2.36mm and 2.36-4.75mm, and the powder is construction waste recycled powder with the particle size of less than 0.16 mm. The invention designs the solid waste material concrete for efficiently utilizing the construction waste, which has excellent data such as compressive strength, dry density, heat conductivity coefficient and the like and can be applied to more application fields compared with the existing recycled concrete; and the solid waste material concrete has low raw material cost, simple preparation scheme and good application and popularization values.
Description
Technical Field
The invention relates to the technical field of concrete processing, in particular to recycled lightweight aggregate concrete and a preparation process thereof.
Background
The construction waste refers to waste generated in the activities of building, reconstruction, extension and demolition of a structure, and mainly comprises waste concrete blocks, waste asphalt concrete blocks, mortar, concrete, broken brick slag and the like scattered in the construction process. In recent years, with the vigorous development of the construction industry, research on recycling and reusing of waste building materials has become an important issue in the field of green building research, and related industries can create great new values and need to be further developed.
However, the present field of recycling construction waste still has research problems such as low substitution rate of recycled aggregate and poor comprehensive performance of recycled products, and the like, and the research still needs to be continued by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide recycled lightweight aggregate concrete and a preparation process thereof. According to the preparation process provided by the invention, the solid waste materials such as construction waste can be effectively utilized, and a new way is provided for the resource treatment of the construction waste.
In order to realize the purpose, the invention provides the following technical scheme:
the invention adopts one of the technical schemes: the recycled lightweight aggregate concrete comprises the following raw materials in parts by weight:
the light aggregate and the powder are from construction waste.
Preferably, the lightweight aggregate comprises construction waste lightweight aggregate with the particle size of 0.16-2.36mm and/or construction waste lightweight aggregate with the particle size of 2.36-4.75 mm.
Preferably, the powder is construction waste powder with the particle size of less than 0.16 mm.
Preferably, the ore powder is S105-grade ore powder.
Preferably, the cement is ordinary portland cement.
The second technical scheme of the invention is as follows: the preparation method of the recycled lightweight aggregate concrete comprises the following steps:
and (3) uniformly mixing the solid components except the water reducing agent, dispersing the water reducing agent in water, and finally mixing and maintaining all the components to prepare the recycled lightweight aggregate concrete.
Preferably, the water-to-solid ratio of the added mass of water to the mass of the solid component is 0.1 to 0.14.
Preferably, the lightweight aggregate in the solid component is pretreated lightweight aggregate, wherein the pretreatment method is saturation surface dry treatment.
Preferably, the dry processing of the saturation surface specifically comprises:
the light aggregate is put into water to fully absorb water, and then is put on a screen with holes at the bottom for standing until the dry state is achieved.
The saturation surface dry method used in the invention is to fully absorb water into the gaps of the aggregate and remove the excess water on the surface of the aggregate. The aggregate after the dry treatment of the saturated surface has little absorption to the moisture in the cement paste when mixing the concrete, thereby ensuring the working performance of the fresh concrete.
Preferably, the curing is carried out for 28d under the conditions of 20 ℃ and 90% relative humidity.
The invention has the following beneficial technical effects:
the invention designs the solid waste material concrete which efficiently utilizes the construction waste, and realizes the technical effect of greatly reducing the influence of the construction waste on the product performance by the saturation surface dry treatment with extremely low cost, thereby allowing higher recycled aggregate substitution rate; the solid waste material concrete has excellent data such as compressive strength, dry density, heat conductivity coefficient and the like, and can be applied to more application fields compared with the existing recycled concrete; and the solid waste material concrete has low raw material cost, simple preparation scheme and good application and popularization values.
The invention limits the grain diameter of each part of raw materials of the prepared concrete to be less than 4.75mm, and prepares the concrete without coarse aggregate. Compared with concrete using coarse aggregate, the concrete has better data such as compressive strength and the like, mainly because the components with large particle size can destroy the consistency of the concrete, so that the concrete is easier to break.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but rather as a more detailed description of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every intervening value, to the extent any stated value or intervening value in a stated range, and any other stated or intervening value in a stated range, is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including but not limited to.
The construction waste used in the following examples and comparative examples of the present invention was obtained from the products of energy saving materials for buildings, inc., yingshuo, lake.
The lightweight aggregate used in the following examples and comparative examples of the invention is construction waste recycled lightweight aggregate, and the particle size of the lightweight aggregate comprises 0.16-2.36mm part and 2.36-4.75mm part; in the comparative example, the construction waste recycled coarse aggregate with the grain diameter of 4.75mm-10mm is also used;
the powder used in the following examples and comparative examples of the invention is construction waste recycled powder, and the particle size is less than 0.16mm;
the cement used in the following examples and comparative examples of the present invention was ordinary portland cement PO42.5;
the mineral powder used in the following examples and comparative examples of the invention is S105 grade mineral powder;
the water reducing agent used in the following examples and comparative examples of the invention is a polycarboxylic acid high-efficiency water reducing agent;
the fly ash used in the following examples and comparative examples of the invention is second grade fly ash;
the cement, fly ash, mineral powder and water reducing agent used in the following examples and comparative examples of the invention are all commercially available products.
Example 1
The recycled lightweight aggregate concrete comprises the following raw materials in parts by weight:
the preparation method comprises the following specific steps:
1) Putting the lightweight aggregate into water to fully absorb water, placing the lightweight aggregate on a screen with a hole at the bottom, standing the lightweight aggregate until the surface dry state is achieved, adding powder, cement, fly ash and mineral powder, and mechanically stirring the mixture for 3min to prepare a mixture;
2) And adding a water reducing agent and water with a water-solid ratio of 0.135 into the mixture, mechanically stirring for 3min, vibrating and compacting on a vibrating table, placing for 24h, and then placing in a curing box for 28d at a curing temperature of 20 ℃ and a relative humidity of 90% to obtain the recycled lightweight aggregate concrete.
Example 2
The recycled lightweight aggregate concrete comprises the following raw materials in parts by weight:
the concrete preparation process is shown in example 1, and the recycled lightweight aggregate concrete is prepared.
Example 3
The recycled lightweight aggregate concrete comprises the following raw materials in parts by weight:
the concrete preparation process is shown in example 1, and the recycled lightweight aggregate concrete is prepared.
Comparative example 1
The recycled lightweight aggregate concrete comprises the following raw materials in parts by weight:
the concrete preparation process is shown in example 1, and the recycled lightweight aggregate concrete is prepared.
Comparative example 2
The recycled lightweight aggregate concrete comprises the following raw materials in parts by weight:
the concrete was prepared as in example 1.
Effect test example 1
The compressive strength of the recycled concrete prepared in examples 1 to 3 and comparative examples 1 to 2 was measured in accordance with GB-T50081-2019, and the results are shown in Table 1.
The dry densities of the recycled concrete prepared in examples 1 to 3 and comparative examples 1 to 2 were measured in accordance with GB-T50081-2019, and the results are shown in Table 1.
The thermal conductivity of the recycled concrete prepared in examples 1 to 3 and comparative examples 1 to 2 was measured in accordance with GB-T50081-2019, and the results are shown in Table 1.
TABLE 1 compression Strength, dry Density, thermal conductivity results for recycled concrete prepared in examples 1-3 and comparative examples 1-2
| Compressive strength (Mpa) | Dry density (kg/m) 3 ) | Coefficient of thermal conductivity (W.m) -1 ·k -1 ) | |
| Example 1 | 20.6 | 1720 | 0.4212 |
| Example 2 | 28.8 | 1820 | 0.5164 |
| Example 3 | 18.2 | 1650 | 0.3128 |
| Comparative example 1 | 22.1 | 1780 | 0.4765 |
| Comparative example 2 | 16.3 | 1550 | 0.3636 |
As can be seen from the data in Table 1, the gradation of the recycled waste in the scheme has great influence on the performance of the recycled concrete in all aspects; particularly, as can be seen from the comparison between example 2 and example 3, when the lightweight aggregate having a particle size of 2.36 to 4.75mm is omitted, the compressive strength is lowered to 18.2MPa and the thermal conductivity is lowered to 0.3128 W.m -1 ·k -1 . It can also be seen from the comparison of example 2 with comparative example 2 that when the lightweight aggregate having a particle size of 0.16 to 2.36mm is replaced with the coarse aggregate having a particle size of 4.75 to 10mm, the compressive strength is greatly affected, mainly because the large-particle-size component deteriorates the consistency of the concrete, thereby making the concrete more likely to break. The recycled lightweight aggregate concrete prepared by the invention can better improve the mixing amount of construction waste in the recycled concrete, and the mechanical and thermal performances are improved to a certain extent.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The recycled lightweight aggregate concrete is characterized by comprising the following raw materials in parts by weight:
the light aggregate and the powder are from construction waste.
2. The recycled lightweight aggregate concrete of claim 1, wherein the lightweight aggregate comprises a construction waste lightweight aggregate having a particle size of 0.16 to 2.36mm and/or a construction waste lightweight aggregate having a particle size of 2.36 to 4.75 mm.
3. The recycled lightweight aggregate concrete of claim 1, wherein the powder is construction waste powder having a particle size of less than 0.16 mm.
4. The recycled lightweight aggregate concrete according to claim 1, wherein the ore fines are grade S105 ore fines.
5. The recycled lightweight aggregate concrete according to claim 1, wherein the cement is ordinary portland cement.
6. A method for preparing recycled lightweight aggregate concrete according to any one of claims 1 to 5, which comprises the steps of:
and (3) uniformly mixing the solid components except the water reducing agent, dispersing the water reducing agent in water, and finally mixing and maintaining all the components to prepare the recycled lightweight aggregate concrete.
7. The method for producing recycled lightweight aggregate concrete according to claim 6, wherein the water-to-solid ratio of the mass of water added to the mass of the solid component is 0.1 to 0.14.
8. The method for preparing recycled lightweight aggregate concrete according to claim 6, wherein the lightweight aggregate in the solid component is pretreated lightweight aggregate, and the pretreatment method is a saturation surface dry method.
9. The method for preparing recycled lightweight aggregate concrete according to claim 8, wherein the saturation surface dry method is specifically operated as follows:
the lightweight aggregate is put into water to fully absorb water, and then is placed on a screen with holes at the bottom for standing until the surface dry state is achieved.
10. The method for preparing recycled lightweight aggregate concrete according to claim 6, wherein the curing is carried out for 28 days at 20 ℃ and 90% relative humidity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211445879.1A CN115784685A (en) | 2022-11-18 | 2022-11-18 | Recycled lightweight aggregate concrete and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211445879.1A CN115784685A (en) | 2022-11-18 | 2022-11-18 | Recycled lightweight aggregate concrete and preparation process thereof |
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| CN115784685A true CN115784685A (en) | 2023-03-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186958A (en) * | 2016-07-21 | 2016-12-07 | 武汉源锦商品混凝土有限公司 | A kind of regenerative micro powder lightweight aggregate high-strength concrete and preparation method thereof |
| CN108558303A (en) * | 2018-01-17 | 2018-09-21 | 同济大学 | A kind of regeneration concrete bulk and its production method |
| CN109437796A (en) * | 2018-12-04 | 2019-03-08 | 廊坊荣盛混凝土有限公司 | Discarded regenerative micro powder concrete preparation and application |
| CN112624683A (en) * | 2020-09-25 | 2021-04-09 | 北京新奥混凝土集团有限公司 | Lightweight concrete |
| CN114956707A (en) * | 2021-12-30 | 2022-08-30 | 临沂蓝泰环保科技有限公司 | Concrete for frame structure house and preparation method thereof |
-
2022
- 2022-11-18 CN CN202211445879.1A patent/CN115784685A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186958A (en) * | 2016-07-21 | 2016-12-07 | 武汉源锦商品混凝土有限公司 | A kind of regenerative micro powder lightweight aggregate high-strength concrete and preparation method thereof |
| CN108558303A (en) * | 2018-01-17 | 2018-09-21 | 同济大学 | A kind of regeneration concrete bulk and its production method |
| CN109437796A (en) * | 2018-12-04 | 2019-03-08 | 廊坊荣盛混凝土有限公司 | Discarded regenerative micro powder concrete preparation and application |
| CN112624683A (en) * | 2020-09-25 | 2021-04-09 | 北京新奥混凝土集团有限公司 | Lightweight concrete |
| CN114956707A (en) * | 2021-12-30 | 2022-08-30 | 临沂蓝泰环保科技有限公司 | Concrete for frame structure house and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 古松: "《再生混凝土基本性能与工程应用》", 武汉：武汉大学出版社, pages: 24 * |
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