CN113045270A - Preparation method of rubber-doped nano-silica modified recycled concrete - Google Patents
Preparation method of rubber-doped nano-silica modified recycled concrete Download PDFInfo
- Publication number
- CN113045270A CN113045270A CN202110288504.8A CN202110288504A CN113045270A CN 113045270 A CN113045270 A CN 113045270A CN 202110288504 A CN202110288504 A CN 202110288504A CN 113045270 A CN113045270 A CN 113045270A
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- Prior art keywords
- rubber
- recycled concrete
- aggregate
- recycled
- nano
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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
- C04B28/04—Portland cements
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
The invention provides a preparation method of rubber-doped nano-silica modified recycled concrete, which comprises the following steps: cement (P.O42.5 Portland cement produced by Huaxin cement company), recycled coarse aggregate (obtained by crushing abandoned roads), fine aggregate (Wuhan natural river sand, dried and sieved, the fineness modulus of the river sand used in the test is 2.6, and the density is 2.64g/cm3), rubber particles (80, rubber powder with 100-mesh particles), nano-silica (20nm, hydrophilic type), and an additive (a water reducing agent with a water reducing rate of 26%). The recycled concrete is new concrete formed by washing, crushing and screening waste concrete and then mixing the waste concrete according to a certain proportion, wherein part or all of the recycled aggregate replaces natural aggregate to be reconfigured, and the rubber belongs to a tough material and has the advantages of high elasticity, wear resistance, durability, plasticity and the like.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to a preparation method of rubber-doped nano-silica modified recycled concrete.
Background
With the development of the construction industry, the consumption of construction materials is increasing. According to statistics, the usage amount of the concrete in China accounts for 45% of the total global consumption, and the output of domestic construction waste is estimated to reach astonishing 39.66 hundred million tons in 2020. Meanwhile, with the development of the automobile industry, more than 5000 million waste rubber tires are produced in China every year, only a small part of the waste rubber tires are treated and then utilized, and a large amount of untreated waste tires can cause very adverse effects on the environment and can also cause harm to the health of people. Therefore, the development of the concrete recycling technology is an urgent problem, the exploitation of natural gravels must be reduced, and meanwhile, the construction waste is effectively utilized to produce concrete, so that a sustainable development road is formed.
Disclosure of Invention
Aiming at the problems, the preparation method of the rubber-doped nano-silica modified recycled concrete is provided, and the purpose is to provide the recycled concrete with excellent mechanical property and durability.
The specific technical scheme is as follows:
the invention provides a rubber-doped nano-silica modified recycled concrete, which is characterized by comprising the following raw materials in parts by weight: a preparation method of rubber-doped nano-silica modified recycled concrete comprises the following steps: cement (P.O42.5 Portland cement produced by Huaxin cement company), recycled coarse aggregate (obtained by crushing abandoned roads), fine aggregate (Wuhan natural river sand, dried and sieved, the fineness modulus of the river sand used in the test is 2.6, and the density is 2.64g/cm3), rubber particles (80, rubber powder with 100-mesh particles), nano-silica (20nm, hydrophilic type), and an additive (a water reducing agent with a water reducing rate of 26%).
The rubber composite doped nano-silica modified recycled concrete also has the characteristics that the raw coarse aggregate is obtained by crushing waste roads, the requirement of recycling construction waste is met, and the requirement of mechanical property of the recycled concrete is met.
The rubber-doped nano-silica modified recycled concrete is characterized in that reliable basic guarantee is provided for popularization and application of the recycled aggregate and practical engineering application of the recycled concrete.
The rubber composite doped nano silicon dioxide modified recycled concrete is also characterized in that the rubber powder is modified by 100-mesh modified recycled concrete and drying, and the rubber powder is characterized in that the impermeability and the mechanical property in a short period are enhanced.
The rubber is doped with the nano-silica to modify the recycled concrete, so that the mechanical property of the recycled concrete is improved through filling effect, chemical activity, crystal nucleus effect, interface transition region optimization and the like.
The rubber-doped nano-silica modified recycled concrete is characterized in that rubber powder and nano-silica are mixed to research a novel doped recycled concrete, the mechanical property and impermeability of the novel doped recycled concrete are explored, and the mechanical property of the recycled concrete is enhanced by premixing the nano-silica and recycled aggregate.
The rubber-doped nano-silica modified recycled concrete also has the characteristic that the used cement is P.O42.5 ordinary portland cement produced by Huaxin cement company.
The rubber-doped nano-silica modified recycled concrete is also characterized in that the fine aggregate is Wuhan natural river sand, the sand is dried and screened, the fineness modulus of the river sand used in the test is 2.6, and the density is 2.64g/cm3。
The rubber-doped nano-silica modified recycled concrete is also characterized in that the additive is a water reducing agent with a water reducing rate of 26%.
The rubber powder is modified to enhance the bonding force of the rubber particles and the concrete and inhibit the alkali aggregate reaction of the recycled concrete.
The beneficial effect of above-mentioned scheme is:
when the mixing amount of the rubber powder is less, a certain filling effect can be achieved, the pores in the recycled concrete can be reduced, the compactness is increased, and the impermeability is further improved to a certain extent. And a proper amount of nano-silica can effectively fill micro-cracks between the recycled aggregate and the mortar, so that the number of capillary pores in the recycled concrete is greatly reduced, and the capillary pores are refined and curved, and further communicated pores are blocked better, and the impermeability of the recycled concrete is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
A preparation method of rubber-doped nano-silica modified recycled concrete comprises the following steps:
firstly, adding recycled coarse aggregate, nano silicon dioxide and additional water into a stirrer, stirring for two minutes, adding natural aggregate, sand, cement, rubber powder and water into the stirrer, uniformly stirring, and pouring into a mold;
step two, placing the concrete test block in a constant-temperature curing box for curing for 28 days;
the cement is P.O42.5 ordinary portland cement produced by Huaxin cement company, the recycled coarse aggregate is obtained by crushing waste roads, the fine aggregate is Wuhan natural river sand, the sand is dried and then screened, the fineness modulus of the river sand used in the test is 2.6, the density is 2.64g/cm3, the rubber particles are 80, the rubber powder with 100-mesh particles is used after being dried by an oven, the nano silicon dioxide is 20nm, the nano silicon dioxide is hydrophilic, and the additive is a water reducing agent with the water reducing rate of 26%.
The test proportion of the invention is as follows:
the test results of the invention are as follows:
as can be seen from the above table, the performance of the modified recycled concrete prepared by compounding the rubber with the nano silicon dioxide is greatly improved. When the rubber powder content is 15% and the nano SiO2 content is 1.5%, the recycled concrete still has higher anti-permeability performance than the standard group, and when the rubber powder content is 5% and the nano SiO2 content is 3%, the anti-permeability performance is the best.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A preparation method of rubber-doped nano-silica modified recycled concrete comprises the following steps: cement (P.O42.5 Portland cement produced by Huaxin cement company), recycled coarse aggregate (obtained by crushing abandoned roads), fine aggregate (Wuhan natural river sand, dried and sieved, the fineness modulus of the river sand used in the test is 2.6, and the density is 2.64g/cm3), rubber particles (80, rubber powder with 100-mesh particles), nano-silica (20nm, hydrophilic type), and an additive (a water reducing agent with a water reducing rate of 26%).
2. The rubber composite doped nano-silica modified recycled concrete according to claim 1, characterized in that the recycled coarse aggregate is obtained by crushing waste roads, meets the recycling requirement of construction waste and meets the requirement of mechanical property of recycled concrete.
3. The rubber-doped nano-silica modified recycled concrete according to claim 1, wherein the advantages and disadvantages of the recycled aggregate are searched by analyzing the differences of aggregate gradation, water absorption, water content and other physical properties of the recycled aggregate compared with those of natural aggregate, and the rubber-doped nano-silica modified recycled concrete is characterized by providing reliable foundation guarantee for popularization and application of the recycled aggregate and practical engineering application of recycled concrete.
4. The rubber-doped nano-silica modified recycled concrete as claimed in claim 1, wherein the rubber powder is modified by using 100-mesh modified recycled concrete and drying, and is characterized in that the impermeability and short-term mechanical properties are enhanced.
5. The rubber-doped nano-silica modified recycled concrete according to claim 1, wherein the mechanical properties of the recycled concrete are improved by filling effect, chemical activity, nucleation, interface transition zone optimization and the like.
6. The rubber-doped nano-silica modified recycled concrete of claim 1, wherein rubber powder and nano-silica are mixed to research a novel doped recycled concrete and explore the mechanical properties and impermeability of the novel doped recycled concrete, and the mechanical properties of the recycled concrete are enhanced by pre-mixing the nano-silica and recycled aggregate.
7. The rubber-doped nano-silica modified recycled concrete according to claim 1, wherein the cement is P.O42.5 ordinary portland cement manufactured by Huaxin Cement company.
8. The rubber-doped nano-silica modified recycled concrete of claim 1, wherein the fine aggregate is Wuhan natural river sand, the sand is dried and screened, the fineness modulus of the river sand used in the test is 2.6, and the density is 2.64g/cm 3.
9. The rubber-doped nano-silica modified recycled concrete according to claim 1, wherein the additive is a water reducing agent with a water reducing rate of 26%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110288504.8A CN113045270A (en) | 2021-03-15 | 2021-03-15 | Preparation method of rubber-doped nano-silica modified recycled concrete |
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| CN202110288504.8A CN113045270A (en) | 2021-03-15 | 2021-03-15 | Preparation method of rubber-doped nano-silica modified recycled concrete |
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| CN113045270A true CN113045270A (en) | 2021-06-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521110A (en) * | 2022-09-29 | 2022-12-27 | 武汉工程大学 | Light rubber mineral powder recycled concrete and preparation method thereof |
| CN117142823A (en) * | 2023-08-30 | 2023-12-01 | 西南科技大学 | 3D printed concrete dismantling-free template and preparation method thereof |
-
2021
- 2021-03-15 CN CN202110288504.8A patent/CN113045270A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521110A (en) * | 2022-09-29 | 2022-12-27 | 武汉工程大学 | Light rubber mineral powder recycled concrete and preparation method thereof |
| CN117142823A (en) * | 2023-08-30 | 2023-12-01 | 西南科技大学 | 3D printed concrete dismantling-free template and preparation method thereof |
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