CN115893951B - High-compactness recycled concrete and preparation method thereof - Google Patents
High-compactness recycled concrete and preparation method thereof Download PDFInfo
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- CN115893951B CN115893951B CN202211603664.8A CN202211603664A CN115893951B CN 115893951 B CN115893951 B CN 115893951B CN 202211603664 A CN202211603664 A CN 202211603664A CN 115893951 B CN115893951 B CN 115893951B
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 20
- 238000002791 soaking Methods 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 15
- 239000002699 waste material Substances 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 10
- 239000001569 carbon dioxide Substances 0.000 claims description 10
- 238000003763 carbonization Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000002715 modification method Methods 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 239000012615 aggregate Substances 0.000 abstract description 82
- 238000012545 processing Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 238000010257 thawing Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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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- Processing Of Solid Wastes (AREA)
Abstract
The invention provides high-compactness recycled concrete and a preparation method thereof, and belongs to the technical field of concrete processing. The high-compactness recycled concrete is prepared by using cement, natural coarse aggregate, natural fine aggregate, modified recycled coarse aggregate, modified recycled fine aggregate, additive and water as raw materials. The recycled concrete prepared by the method has excellent mechanical property and durability, and meanwhile, the compactness of the recycled concrete is remarkably improved.
Description
Technical Field
The invention relates to the technical field of concrete processing, in particular to high-compactness recycled concrete and a preparation method thereof.
Background
In recent years, due to the demands of urban and modern construction, the construction industry of China rapidly develops, and the sustainable development of national economy is strongly supported, so that the construction method becomes one of the post industries of China. Behind the huge number of construction works is huge resource consumption. Taking concrete as an example, concrete is the most widely used building material in civil engineering due to its moldability, durability and easy availability. In the concrete components, sand and stone are taken from natural non-renewable resources, and the huge consumption of sand and stone is also indicated by the huge back of the concrete consumed by the large-quantity building engineering, and the depletion trend of high-quality natural aggregate is shown, so that the development of local engineering construction and national economy is influenced. In this regard, sustainable development of society and economy has placed a demand for sustainable development in the construction industry: how to ensure reasonable development of original resources, improve the utilization rate of the resources and popularize the application of novel materials is a problem facing urgent attention at present.
While the construction industry is rapidly developing, construction waste is continuously generated, wherein the proportion of waste concrete is up to 50% -60%. Simply discarding the waste material not only has great pollution to the environment, but also requires a huge landfill site and can also have serious influence on the environment. At present, the main problems in the process of recycling the waste concrete to prepare the recycled concrete are as follows: the recycled aggregate produced by the waste concrete has the characteristics of porosity, low compactness, high water absorption, poor mechanical property, high impurity and the like, and seriously influences the comprehensive performance of the recycled concrete.
The patent with the application publication number of CN 113443874A discloses recycled concrete with synergistic reinforcement of nano calcium carbonate and polypropylene fibers and a preparation method thereof, and the recycled concrete takes cement, natural coarse aggregate, natural fine aggregate, recycled coarse aggregate, water, nano calcium carbonate, polypropylene fibers and a polycarboxylic acid high-efficiency water reducer as raw materials, so that the compactness and the compressive strength of the recycled concrete are improved. However, the recycled concrete prepared by the patent has poor durability, especially freeze-thawing resistance.
Disclosure of Invention
In view of the above, the invention provides a high-compactness recycled concrete and a preparation method thereof. The recycled concrete prepared by using cement, natural coarse aggregate, natural fine aggregate, modified recycled coarse aggregate, modified recycled fine aggregate, additive and water as raw materials has excellent mechanical properties and durability, and meanwhile, the compactness of the recycled concrete is remarkably improved.
The first object of the invention is to provide a high-compactness recycled concrete, which is prepared from the following raw materials in parts by weight:
Preferably, the cement is Portland cement with a strength of 52.5 grade.
Preferably, the natural coarse aggregate is natural river sand with continuous grading, the grain diameter is 1.25mm-2.26mm, the apparent density is 1890Kg/m 3-2360Kg/m3, and the water content is 0.1% -0.15%.
Preferably, the natural fine aggregate is quartz powder with continuous grading, and the particle size is 1-3 mu m.
Preferably, the modification method of the modified recycled coarse aggregate comprises the following steps:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled coarse aggregate with the particle size of more than 4.75 mm;
S2, soaking the recycled coarse aggregate in the step S1 in a sodium silicate solution with the mass fraction of 3% -5% for 24h-36h, taking out, drying to constant weight, soaking the dried recycled coarse aggregate in fly ash slurry with the mass fraction of 10% -15% for 24h-36h, taking out after soaking, and drying again to constant weight to obtain the modified recycled coarse aggregate.
Preferably, the modification method of the modified recycled fine aggregate comprises the following steps:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled fine aggregate with the particle size smaller than 4.75 mm;
s2, drying the recycled fine aggregate in the step S1 at the temperature of 60 ℃ for 48 hours, and then sending the dried recycled fine aggregate into a carbonization chamber for carbon dioxide solidification for 24-48 hours to obtain the modified recycled fine aggregate, wherein the concentration of carbon dioxide in the carbonization chamber is kept at 20+/-2%, and the temperature and the relative humidity are respectively kept at 20 ℃ and 60%.
Preferably, the additive is a polycarboxylic acid high-efficiency water reducing agent with water reducing rate of 30% and air content of 2.2%.
The second object of the invention is to provide a method for preparing high-compactness recycled concrete, comprising the following steps:
S1, weighing cement and water according to a formula, and uniformly stirring and mixing to obtain a cement sizing material;
S2, weighing the natural coarse aggregate, the natural fine aggregate, the modified recycled coarse aggregate, the modified recycled fine aggregate and the additive according to the formula, and uniformly stirring and mixing to obtain the recycled concrete.
Compared with the prior art, the invention has the following beneficial effects: the addition of the small-grain-size aggregate can fill gaps among the large-grain-size aggregates, the addition of the sand can fill gaps among the coarse aggregates, and finally the addition of the cement can further fill gaps among the coarse aggregates and the fine aggregates, so that the stacking compactness of the concrete is increased along with the decrease of the gaps among the solid components, and the recycled concrete is more compact. In addition, the technical scheme is designed and optimized, so that the compactness of the prepared recycled concrete is remarkably improved, and meanwhile, the mechanical property, durability and the like of the recycled concrete can be improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the invention, are within the scope of the invention.
The test methods or test methods described in the following examples are all conventional methods unless otherwise specified; the starting materials and auxiliaries, unless otherwise specified, are obtained commercially from conventional sources or are prepared in conventional manner.
The cement used in each example and comparative example of the present invention was Portland cement with a strength of 52.5 grade;
The natural coarse aggregate is natural river sand with continuous grading, the grain diameter is 1.25mm-2.26mm, the apparent density is 1890Kg/m 3-2360Kg/m3, and the water content is 0.1%;
the natural fine aggregate is continuous graded quartz powder, and the grain diameter is 1-3 mu m;
the additive is a polycarboxylic acid high-efficiency water reducer with water reducing rate of 30% and air content of 2.2%, and is purchased from Shandong yuncheng brilliant novel building material science and technology Co.
Example 1
The preparation method of the high-compactness recycled concrete comprises the following specific steps:
s1, weighing 200 parts of cement and 100 parts of water according to a formula, and uniformly stirring and mixing to obtain a cement sizing material;
And S2, weighing 550 parts of natural coarse aggregate, 400 parts of natural fine aggregate, 200 parts of modified recycled coarse aggregate, 200 parts of modified recycled fine aggregate and 13 parts of additive according to the formula, and uniformly stirring and mixing to obtain recycled concrete.
The modification method of the modified recycled coarse aggregate in the step S2 is as follows:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled coarse aggregate with the particle size of more than 4.75 mm;
S2, soaking the recycled coarse aggregate in the step S1 in a sodium silicate solution with the mass fraction of 3%, wherein the soaking time is 24hh, taking out, drying to constant weight, then soaking the recycled coarse aggregate dried to constant weight in a fly ash slurry with the mass fraction of 10%, wherein the soaking time is 24hh, fishing out after the soaking is finished, and drying to constant weight again to obtain the modified recycled coarse aggregate.
The modification method of the modified recycled fine aggregate comprises the following steps:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled fine aggregate with the particle size smaller than 4.75 mm;
s2, drying the recycled fine aggregate in the step S1 at the temperature of 60 ℃ for 48 hours, and then sending the recycled fine aggregate into a carbonization chamber for carbon dioxide curing for 24 hours to obtain the modified recycled fine aggregate, wherein the concentration of carbon dioxide in the carbonization chamber is kept at 18%, and the temperature and the relative humidity are respectively kept at 20 ℃ and 60%.
Example 2
The preparation method of the high-compactness recycled concrete comprises the following specific steps:
s1, weighing 258 parts of cement and 150 parts of water according to a formula, and uniformly stirring and mixing to obtain a cement sizing material;
S2, weighing 58 parts of natural coarse aggregate, 435 parts of natural fine aggregate, 265 parts of modified recycled coarse aggregate, 272 parts of modified recycled fine aggregate and 14 parts of additive according to a formula, and uniformly stirring and mixing to obtain recycled concrete.
The modification method of the modified recycled coarse aggregate in the step S2 is as follows:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled coarse aggregate with the particle size of more than 4.75 mm;
S2, soaking the recycled coarse aggregate in the step S1 in a sodium silicate solution with the mass fraction of 4% for 28 hours, taking out, drying to constant weight, soaking the recycled coarse aggregate dried to constant weight in a fly ash slurry with the mass fraction of 12%, taking out after soaking for 28 hours, and drying to constant weight again to obtain the modified recycled coarse aggregate.
The modification method of the modified recycled fine aggregate comprises the following steps:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled fine aggregate with the particle size smaller than 4.75 mm;
S2, drying the recycled fine aggregate in the step S1 at the temperature of 60 ℃ for 48 hours, and then sending the recycled fine aggregate into a carbonization chamber for carbon dioxide curing for 38 hours to obtain the modified recycled fine aggregate, wherein the concentration of carbon dioxide in the carbonization chamber is kept at 20%, and the temperature and the relative humidity are respectively kept at 20 ℃ and 60%.
Example 3
The preparation method of the high-compactness recycled concrete comprises the following specific steps:
s1, weighing 300 parts of cement and 200 parts of water according to a formula, and uniformly stirring and mixing to obtain a cement sizing material;
And S2, weighing 650 parts of natural coarse aggregate, 450 parts of natural fine aggregate, 300 parts of modified recycled coarse aggregate, 300 parts of modified recycled fine aggregate and 15 parts of additive according to a formula, and uniformly stirring and mixing to obtain recycled concrete.
The modification method of the modified recycled coarse aggregate in the step S2 is as follows:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled coarse aggregate with the particle size of more than 4.75 mm;
s2, soaking the recycled coarse aggregate in the step S1 in a sodium silicate solution with the mass fraction of 5% for 36h, taking out, drying to constant weight, soaking the recycled coarse aggregate dried to constant weight in a fly ash slurry with the mass fraction of 15%, taking out after soaking for 36h, and drying to constant weight again to obtain the modified recycled coarse aggregate.
The modification method of the modified recycled fine aggregate comprises the following steps:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled fine aggregate with the particle size smaller than 4.75 mm;
S2, drying the recycled fine aggregate in the step S1 at the temperature of 60 ℃ for 48 hours, and then sending the recycled fine aggregate into a carbonization chamber for carbon dioxide curing for 48 hours to obtain the modified recycled fine aggregate, wherein the concentration of carbon dioxide in the carbonization chamber is kept at 22%, and the temperature and the relative humidity are respectively kept at 20 ℃ and 60%.
Comparative example 1
The difference from example 1 is that the unmodified recycled coarse aggregate was added.
Comparative example 2
The difference from example 1 is that the unmodified recycled fine aggregate was added.
Comparative example 3
The difference from example 1 is that the modified recycled coarse aggregate and the modified recycled fine aggregate are not added.
Reference is made to the slow-freezing method of the ninth knot in chapter four, handbook of practical building materials experiments: and (3) putting the recycled concrete test block after curing for 28d into a freezing box, keeping the temperature at-15 to-20 ℃ for no less than 4 hours, taking out, putting into a water tank, keeping the water temperature at 15-20 ℃ for no less than 4 hours, finishing one freezing and thawing cycle after thawing, and taking out and putting into the freezing box for the next freezing and thawing cycle. After 25 freeze thawing times, the appearance of the recycled concrete test blocks of examples 1-3 was not significantly changed, while the surface edges and corners of the recycled concrete test blocks prepared in comparative examples 1-3 were worn to different extents.
The compressive strength of the recycled concrete of comparative examples 1 to 3 was tested with reference to GB/T50081-2019 Standard for test methods for physical mechanical Properties of concrete, the compressive strengths of the recycled concrete after 7 days and 28 days of curing were tested, and the test results are shown in Table 1.
TABLE 1
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (3)
1. The high-compactness recycled concrete is characterized by being prepared from the following raw materials in parts by weight:
200-300 parts of cement
550-650 Parts of natural coarse aggregate
400-450 Parts of natural fine aggregate
200-300 Parts of modified recycled coarse aggregate
200-300 Parts of modified recycled fine aggregate
13-15 Parts of additive
100-200 Parts of water;
the modification method of the modified recycled coarse aggregate comprises the following steps:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled coarse aggregate with the particle size of more than 4.75 mm;
S2, soaking the recycled coarse aggregate in the step S1 in a sodium silicate solution with the mass fraction of 3% -5% for 24h-36h, taking out, drying to constant weight, soaking the dried recycled coarse aggregate in a fly ash slurry with the mass fraction of 10% -15% for 24h-36h, taking out after soaking, and drying to constant weight again to obtain the modified recycled coarse aggregate;
the modification method of the modified recycled fine aggregate comprises the following steps:
s1, crushing, screening and cleaning the waste concrete blocks in sequence to obtain recycled fine aggregate with the particle size smaller than 4.75 mm;
S2, drying the recycled fine aggregate in the step S1 at the temperature of 60 ℃ for 48 hours, and then sending the dried recycled fine aggregate into a carbonization chamber for carbon dioxide solidification for 24-48 hours to obtain modified recycled fine aggregate, wherein the concentration of carbon dioxide in the carbonization chamber is kept at 20+/-2%, and the temperature and the relative humidity are respectively kept at 20 ℃ and 60%;
The natural coarse aggregate is natural river sand with continuous grading, the grain diameter is 1.25 mm-2.26 mm, the apparent density is 1890Kg/m 3-2360Kg/m3, and the water content is 0.1%;
The natural fine aggregate is continuous graded quartz powder with the grain diameter of 1-3um;
The additive is a polycarboxylic acid high-efficiency water reducing agent with water reducing rate of 30% and air content of 2.2%.
2. The high-compactness recycled concrete of claim 1, wherein the cement is Portland cement with a strength of 52.5 grade.
3. A method for preparing high-compactness recycled concrete according to any one of claims 1 to 2, characterized by comprising the following steps:
S1, weighing cement and water according to a formula, and uniformly stirring and mixing to obtain a cement sizing material;
S2, weighing the natural coarse aggregate, the natural fine aggregate, the modified recycled coarse aggregate, the modified recycled fine aggregate and the additive according to the formula, and uniformly stirring and mixing to obtain the recycled concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211603664.8A CN115893951B (en) | 2022-12-13 | 2022-12-13 | High-compactness recycled concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211603664.8A CN115893951B (en) | 2022-12-13 | 2022-12-13 | High-compactness recycled concrete and preparation method thereof |
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| Publication Number | Publication Date |
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| CN115893951A CN115893951A (en) | 2023-04-04 |
| CN115893951B true CN115893951B (en) | 2024-04-19 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104045251A (en) * | 2014-05-29 | 2014-09-17 | 湖南大学 | Method for carbon dioxide strengthening of recycled concrete aggregate |
| CN114735984A (en) * | 2022-05-12 | 2022-07-12 | 徐州市江山新型建材有限公司 | Recycled concrete and preparation method thereof |
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2022
- 2022-12-13 CN CN202211603664.8A patent/CN115893951B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104045251A (en) * | 2014-05-29 | 2014-09-17 | 湖南大学 | Method for carbon dioxide strengthening of recycled concrete aggregate |
| CN114735984A (en) * | 2022-05-12 | 2022-07-12 | 徐州市江山新型建材有限公司 | Recycled concrete and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 伍勇华等.《土木工程材料》.武汉理工大学出版社,2022,(第2版),第72-73页. * |
| 基于综合利用建筑垃圾再生骨料混凝土的研究;林志伟;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》(第05期);C038-391 * |
| 李秋义.《建筑垃圾资源化再生利用技术》.中国建材工业出版社,2011,(第1版),第103-104页. * |
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