CN110937859A - Recycled concrete and preparation method thereof - Google Patents
Recycled concrete and preparation method thereof Download PDFInfo
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- CN110937859A CN110937859A CN201911281916.8A CN201911281916A CN110937859A CN 110937859 A CN110937859 A CN 110937859A CN 201911281916 A CN201911281916 A CN 201911281916A CN 110937859 A CN110937859 A CN 110937859A
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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
- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses recycled concrete and a preparation method thereof. The composition comprises the following components in parts by weight: 800-1200 parts of regenerated aggregate, 500 parts of natural sand 200-500 parts, 30-200 parts of pyrophyllite, 600 parts of gel material 400-35 parts, 15-35 parts of air-entraining agent, 5-12 parts of foaming agent, 3-8 parts of water reducing agent and 500 parts of water 200-500-parts. The invention uses the concrete waste as the preparation raw material, changes waste into valuable, and the auxiliary agent is added with the combination of the air entraining agent, the foaming agent and the water reducing agent, so that the prepared material has high strength, and the inorganic material of the diabase is added, the diabase powder is extremely fine, and the fluidity is high, so that the diabase can fully permeate into tiny cracks of the regenerated aggregate, the water absorption rate and the water absorption rate of the material are reduced, and the impermeability and the durability of the material are improved.
Description
Technical Field
The invention belongs to the technical field of building material preparation, and particularly relates to recycled concrete and a preparation method thereof.
Background
The concrete fragments are the largest constituent of building garbage, and the waste concrete blocks are crushed, cleaned and graded, and then mixed with the gradation according to a certain proportion, so that natural aggregates such as sand stones and the like are partially or completely replaced, and cement, water and the like are added to prepare the new concrete. The recycled concrete can be combined into aggregates in the following cases: all aggregates are regenerated aggregates; the coarse aggregate is regenerated aggregate, and the fine aggregate is natural sand; the coarse aggregate is natural gravel or cobble, and the fine aggregate is regenerated aggregate; the reclaimed aggregate replaces part of the coarse aggregate or the fine aggregate.
The recycled concrete can greatly save resources and reduce the stacking of construction wastes, but because the waste concrete is subjected to a larger external force in the crushing process, a large number of micro cracks can appear in the aggregate, so that the water absorption rate and the water absorption rate of the recycled aggregate are far higher than those of natural aggregate, and compared with the concrete, the recycled concrete has poor performances such as impermeability, durability and the like.
Disclosure of Invention
The invention aims to provide recycled concrete and a preparation method thereof.
The recycled concrete comprises the following components in parts by weight: 800-1200 parts of regenerated aggregate, 500 parts of natural sand 200-500 parts, 30-200 parts of pyrophyllite, 600 parts of gel material 400-35 parts, 15-35 parts of air-entraining agent, 5-12 parts of foaming agent, 3-8 parts of water reducing agent and 500 parts of water 200-500-parts.
The recycled aggregate is crushed concrete with the particle size of 5-10 mm.
The gel material is prepared from cement and fly ash according to the weight ratio of 1: 1 mass ratio of the mixed mixture.
The air entraining agent is one or more of dodecyl benzyl polyoxyethylene ether, bisphenol A and pentaerythritol.
The foaming agent is one or more of sodium hexadecyl sulfonate, fatty alcohol-polyoxyethylene ether sodium sulfate and triethanolamine.
The water reducing agent is one or more of β -naphthalene sulfonate formaldehyde condensate, lignosulfonate and alkyl glycoside.
The preparation method of the recycled concrete is carried out according to the following steps:
(1) selecting concrete aggregate formed by crushing waste concrete, crushing the concrete aggregate until the particle size is 5-10mm, and preparing the regenerated aggregate;
(2) according to the parts by weight, 800 portions of regenerated aggregate, 500 portions of natural sand, 30-200 portions of pyrophyllite, 600 portions of gel material, 15-35 portions of air entraining agent, 5-12 portions of foaming agent, 3-8 portions of water reducing agent and 500 portions of water are taken and put into a stirrer to be stirred for 40-70min at the speed of 60-80r/min, thus obtaining the material.
The invention has the beneficial effects that: the recycled concrete provided by the invention is prepared from concrete waste, changes waste into valuable, and the auxiliary agent is a combination of an air entraining agent, a foaming agent and a water reducing agent, so that the prepared material is high in strength, and when the mineral material of the diabase is added, the diabase powder is extremely fine and high in fluidity, and can fully permeate into tiny cracks of recycled aggregates, so that the water absorption rate and the water absorption rate of the material are reduced, and the impermeability and the durability of the material are improved.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
The recycled concrete comprises the following components in parts by weight: 1000 parts of regenerated aggregate, 300 parts of natural sand, 80 parts of diabase, 250 parts of cement, 250 parts of fly ash, 20 parts of dodecyl benzyl polyoxyethylene ether, 8 parts of sodium hexadecylsulfonate, 6 parts of sodium lignosulfonate and 300 parts of water.
The preparation method of the recycled concrete is carried out according to the following steps:
(1) selecting concrete aggregate formed by crushing waste concrete, crushing the concrete aggregate until the particle size is 6mm, and preparing the regenerated aggregate;
(2) according to the weight parts, 1000 parts of regenerated aggregate, 300 parts of natural sand, 80 parts of diabase, 250 parts of cement, 250 parts of fly ash, 20 parts of dodecyl benzyl polyoxyethylene ether, 8 parts of sodium hexadecyl sulfonate, 6 parts of sodium lignosulfonate and 300 parts of water are put into a stirrer and stirred for 50min at the speed of 70r/min to prepare the material.
Example 2
The recycled concrete comprises, by weight, 800 parts of recycled aggregate, 250 parts of natural sand, 40 parts of pyrophyllite, 210 parts of cement, 210 parts of fly ash, 16 parts of bisphenol A, 6 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 5 parts of β -naphthalene sulfonate formaldehyde condensate and 280 parts of water.
The preparation method of the recycled concrete is carried out according to the following steps:
(1) selecting concrete aggregate formed by crushing waste concrete, crushing the concrete aggregate until the particle size is 8mm, and preparing the regenerated aggregate;
(2) according to the weight parts, 800 parts of regenerated aggregate, 250 parts of natural sand, 40 parts of diabase, 210 parts of cement, 210 parts of fly ash, 16 parts of bisphenol A, 6 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 5 parts of β -naphthalene sulfonate formaldehyde condensate and 280 parts of water are put into a stirrer and stirred for 60min at the speed of 60r/min to prepare the material.
Example 3
The recycled concrete comprises the following components in parts by weight: 1200 parts of regenerated aggregate, 500 parts of natural sand, 150 parts of pyrophyllite, 280 parts of cement, 280 parts of fly ash, 30 parts of pentaerythritol, 12 parts of triethanolamine, 8 parts of alkyl glycoside and 500 parts of water.
The preparation method of the recycled concrete is carried out according to the following steps:
(1) selecting concrete aggregate formed by crushing waste concrete, crushing the concrete aggregate until the particle size is 5mm, and preparing the regenerated aggregate;
(2) according to the weight parts, 1200 parts of regenerated aggregate, 500 parts of natural sand, 150 parts of pyrophyllite, 280 parts of cement, 280 parts of fly ash, 30 parts of pentaerythritol, 12 parts of triethanolamine, 8 parts of alkyl glycoside and 500 parts of water are put into a stirrer and stirred for 40min at the speed of 80r/min to prepare the material.
Example 4
The recycled concrete comprises, by weight, 880 parts of recycled aggregate, 430 parts of natural sand, 90 parts of diabase, 250 parts of cement, 250 parts of fly ash, 25 parts of dodecyl benzyl polyoxyethylene ether, 9 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 7 parts of β -naphthalene sulfonate formaldehyde condensate and 380 parts of water.
The preparation method of the recycled concrete is carried out according to the following steps:
(1) selecting concrete aggregate formed by crushing waste concrete, crushing the concrete aggregate until the particle size is 10mm, and preparing the regenerated aggregate;
(2) according to the weight parts, 880 parts of regenerated aggregate, 430 parts of natural sand, 90 parts of diabase, 250 parts of cement, 250 parts of fly ash, 25 parts of dodecyl benzyl polyoxyethylene ether, 9 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 7 parts of β -naphthalene sulfonate formaldehyde condensate and 380 parts of water are put into a stirrer and stirred for 55min at the speed of 75r/min to prepare the material.
Example 5
The recycled concrete comprises the following components in parts by weight: 1000 parts of regenerated aggregate, 300 parts of natural sand, 250 parts of cement, 250 parts of fly ash, 20 parts of dodecyl benzyl polyoxyethylene ether, 8 parts of sodium hexadecylsulfonate, 6 parts of sodium lignosulfonate and 300 parts of water.
The preparation method of the recycled concrete is carried out according to the following steps:
(1) selecting concrete aggregate formed by crushing waste concrete, crushing the concrete aggregate until the particle size is 6mm, and preparing the regenerated aggregate;
(2) according to the weight parts, 1000 parts of regenerated aggregate, 300 parts of natural sand, 250 parts of cement, 250 parts of fly ash, 20 parts of dodecyl benzyl polyoxyethylene ether, 8 parts of sodium hexadecyl sulfonate, 6 parts of sodium lignin sulfonate and 300 parts of water are put into a stirrer and stirred for 50min at the speed of 70r/min to prepare the cement.
Experimental example 1:
the anti-permeability performance of the concrete is measured according to a penetration height method of 'test on long-term performance and durability of common concrete' GB 50082-2009. The specific process is as follows: the test piece is a round table test piece with the top surface diameter of 150mm, the bottom surface diameter of 150mm and the height of 150mm, each group of 8 test pieces is adopted, and the test piece age is 28 d. The test equipment is an HS-40 type concrete permeameter. And (3) splitting the test piece after 24 hours by adopting a one-time pressurization method and constant pressure (1.6MPa), and testing the average water seepage height: and taking the average value of the penetration heights of 10 points at equal intervals of each test piece as the penetration height of the test piece, and taking the average value of the penetration heights of 8 test pieces as a test result. And in the constant pressure process, if the end face of the test piece is seeped, stopping pressurizing and recording the water outlet time. The test results are shown in table 1:
TABLE 1
Note: represents P <0.05 compared to control group.
As can be seen from Table 1, the penetration heights of examples 1-4 are all less than 21mm, the 28d strengths are all greater than 45MPa, the anti-permeability capability is stronger, the anti-permeability performance is good, and the anti-permeability performance is significantly higher than that of example 5.
Claims (7)
1. The recycled concrete is characterized by comprising the following components in parts by weight: 800-1200 parts of regenerated aggregate, 500 parts of natural sand 200-500 parts, 30-200 parts of pyrophyllite, 600 parts of gel material 400-35 parts, 15-35 parts of air-entraining agent, 5-12 parts of foaming agent, 3-8 parts of water reducing agent and 500 parts of water 200-500-parts.
2. The recycled concrete of claim 1, wherein the recycled aggregate is crushed concrete having a particle size of 5-10 mm.
3. The recycled concrete of claim 1, wherein the cementitious material is cement and fly ash in a ratio of 1: 1 mass ratio of the mixed mixture.
4. The recycled concrete of claim 1, wherein the air entraining agent is one or more of dodecyl benzyl polyoxyethylene ether, bisphenol A and pentaerythritol.
5. The recycled concrete of claim 1, wherein the foaming agent is one or more of sodium hexadecyl sulfonate, sodium fatty alcohol-polyoxyethylene ether sulfate and triethanolamine.
6. The recycled concrete of claim 1, wherein the water reducing agent is one or more of β -naphthalene sulfonate formaldehyde condensate, lignosulfonate and alkyl glycoside.
7. The method for producing recycled concrete according to claim 1, comprising the steps of:
(1) selecting concrete aggregate formed by crushing waste concrete, crushing the concrete aggregate until the particle size is 5-10mm, and preparing the regenerated aggregate;
(2) according to the parts by weight, 800 portions of regenerated aggregate, 500 portions of natural sand, 30-200 portions of pyrophyllite, 600 portions of gel material, 15-35 portions of air entraining agent, 5-12 portions of foaming agent, 3-8 portions of water reducing agent and 500 portions of water are taken and put into a stirrer to be stirred for 40-70min at the speed of 60-80r/min, thus obtaining the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911281916.8A CN110937859A (en) | 2019-12-13 | 2019-12-13 | Recycled concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911281916.8A CN110937859A (en) | 2019-12-13 | 2019-12-13 | Recycled concrete and preparation method thereof |
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| CN110937859A true CN110937859A (en) | 2020-03-31 |
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| CN201911281916.8A Pending CN110937859A (en) | 2019-12-13 | 2019-12-13 | Recycled concrete and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001225891A (en) * | 2000-02-17 | 2001-08-21 | Taiheiyo Cement Corp | Structure for water storage |
| CN1562858A (en) * | 2004-03-25 | 2005-01-12 | 同济大学 | Mix material of zoology concrete in use for bearing structure and preparation method |
| CN109180104A (en) * | 2018-09-27 | 2019-01-11 | 辽宁科技大学 | A kind of regeneration concrete follows closely brick and preparation method thereof admittedly |
| CN110054442A (en) * | 2019-04-26 | 2019-07-26 | 四川衡鼎建材有限公司 | A kind of regeneration concrete mixture and its preparation process |
| CN110104997A (en) * | 2019-04-26 | 2019-08-09 | 四川衡鼎建材有限公司 | A kind of regeneration concrete and its production technology |
| CN110395963A (en) * | 2019-08-16 | 2019-11-01 | 北京市高强混凝土有限责任公司 | A kind of construction refuse regenerated concrete |
-
2019
- 2019-12-13 CN CN201911281916.8A patent/CN110937859A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001225891A (en) * | 2000-02-17 | 2001-08-21 | Taiheiyo Cement Corp | Structure for water storage |
| CN1562858A (en) * | 2004-03-25 | 2005-01-12 | 同济大学 | Mix material of zoology concrete in use for bearing structure and preparation method |
| CN109180104A (en) * | 2018-09-27 | 2019-01-11 | 辽宁科技大学 | A kind of regeneration concrete follows closely brick and preparation method thereof admittedly |
| CN110054442A (en) * | 2019-04-26 | 2019-07-26 | 四川衡鼎建材有限公司 | A kind of regeneration concrete mixture and its preparation process |
| CN110104997A (en) * | 2019-04-26 | 2019-08-09 | 四川衡鼎建材有限公司 | A kind of regeneration concrete and its production technology |
| CN110395963A (en) * | 2019-08-16 | 2019-11-01 | 北京市高强混凝土有限责任公司 | A kind of construction refuse regenerated concrete |
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