CN112876172B - Recycled concrete and preparation method thereof - Google Patents
Recycled concrete and preparation method thereof Download PDFInfo
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- CN112876172B CN112876172B CN202110237303.5A CN202110237303A CN112876172B CN 112876172 B CN112876172 B CN 112876172B CN 202110237303 A CN202110237303 A CN 202110237303A CN 112876172 B CN112876172 B CN 112876172B
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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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
- 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
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/00284—Materials permeable to liquids
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of concrete, and particularly discloses recycled concrete and a preparation method thereof. The recycled concrete comprises a steel bar framework and concrete slurry poured on the steel bar framework, and the recycled concrete slurry comprises the following components: a cementitious material; diphenyl (trimethylsilyl) phosphine; calcium sulfoaluminate; natural aggregate; regenerating aggregate; water; a water reducing agent; the preparation method comprises the following steps: step (1), uniformly mixing a cementing material, diphenyl (trimethylsilyl) phosphine, a water reducing agent and water to form a premix; step (2), adding natural aggregate, recycled aggregate, calcium sulphoaluminate and calcium oxide into the premix, and uniformly stirring to obtain recycled concrete slurry; and (3) pouring the recycled concrete slurry on the steel frame framework, and maintaining to obtain recycled concrete. It has the compressive strength advantage that improves the recycled concrete that permeates water.
Description
Technical Field
The application relates to the field of concrete, in particular to recycled concrete and a preparation method thereof.
Background
The recycled concrete is prepared by crushing, washing and screening waste concrete blocks to form recycled aggregate, mixing the recycled aggregate according to a certain proportion and gradation, partially or completely replacing natural aggregates such as sand natural aggregate and the like, and then adding cement, water and the like.
Compared with natural aggregate, the waste concrete blocks have more edges and corners and also have a large number of micro cracks, along with the improvement of the substitution degree of the waste concrete blocks on the natural aggregate, the strength of the recycled concrete is easy to reduce, and because the pervious concrete is porous lightweight concrete which is prepared by taking aggregate, cement and water as main raw materials and almost does not contain fine aggregate, the strength of the pervious concrete is generally lower than that of common concrete, the recycled concrete is formed by substituting the recycled aggregate for the natural aggregate, so that the compressive strength of the pervious recycled concrete is poor, the application of the recycled concrete is seriously influenced, and therefore, the space for improvement is also provided.
Disclosure of Invention
In order to improve the compressive strength of the pervious recycled concrete, the application provides the recycled concrete and the preparation method thereof.
In a first aspect, the present application provides recycled concrete. The following technical scheme is adopted:
the recycled concrete comprises a steel bar framework and recycled concrete slurry poured on the steel bar framework, wherein the recycled concrete slurry comprises the following components in parts by mass:
150 portions of cementing material 140;
2-3 parts of diphenyl (trimethylsilyl) phosphine;
2-3 parts of calcium sulphoaluminate;
1-2 parts of calcium oxide;
80-90 parts of natural aggregate;
330 portions and 340 portions of recycled aggregate;
45-52 parts of water;
3-5 parts of a water reducing agent.
By adopting the technical scheme, the structural strength of the recycled concrete is favorably improved by adding the cementing material with a specific proportion to be mixed with the recycled aggregate and the natural aggregate, a stable porous stacking structure is favorably formed, a continuous pore passage is favorably formed, the moisture is favorably penetrated out, the shrinkage deformation resistance of the recycled concrete slurry is improved after the calcium sulphoaluminate and the calcium oxide are added, so that the influence of curing shrinkage on the compressive strength of the recycled concrete is reduced, the gaps of the recycled aggregate are favorably promoted to be filled with the cementing material, the calcium oxide and the calcium sulphoaluminate by adding the diphenyl (trimethylsilyl) phosphine, the moisture in the gaps of the recycled aggregate can promote the hydration reaction of the cementing material after the cementing material is infiltrated into the gaps of the recycled aggregate, the calcium vanadite is generated after the hydration reaction of the calcium sulphoaluminate, so that the gaps of the recycled aggregate are greatly reduced, the concrete is favorable for improving the anti-cracking performance of the recycled aggregate, so that the compressive strength of the recycled concrete is obviously improved, the water permeability of the recycled concrete is further improved, and the components are reasonably matched, so that the structural stability of the recycled concrete is better, the compressive strength of the recycled concrete is stronger, and the recycled concrete is favorable for being directly used as a concrete surface layer.
Preferably, the particle size of the recycled aggregate is 8-10 mm.
By adopting the technical scheme, the particle size of the recycled aggregate is 8-10mm, so that the contact area between the recycled aggregate and the cementing material is favorably increased, the gap filling effect of the recycled aggregate is better, and the reinforcing effect of the recycled aggregate is better.
Preferably, the particle size of the natural aggregate is 20-25 mm.
By adopting the technical scheme, the natural aggregate and the recycled aggregate are matched, so that the stacking density of the natural aggregate and the recycled aggregate is favorably improved, the structural strength of the recycled concrete is further improved, the compressive strength of the permeable recycled concrete is further improved, a certain gap is kept between the natural aggregate and the recycled aggregate, the formation of a continuous pore channel is favorably realized, the penetration of rainwater is favorably realized, and the condition of water accumulation on the pavement is greatly reduced.
Preferably, the recycled concrete slurry further comprises the following components in parts by mass:
0.1-0.5 part of zinc oxide.
By adopting the technical scheme, after the zinc oxide is added and the zinc oxide is matched with the diphenyl (trimethylsilyl) phosphine, the filling of the cementing material, the calcium sulphoaluminate and the calcium oxide in gaps of the recycled aggregate can be further promoted, so that the cracks of the recycled aggregate are reduced, the water permeability coefficient of the recycled concrete is further improved, the cohesiveness among the aggregates is further improved, and the compressive strength of the recycled concrete is further enhanced.
Preferably, the cementing material consists of the following components in parts by mass:
100 parts of Portland cement;
30-35 parts of mineral powder;
10-15 parts of fly ash.
By adopting the technical scheme, the portland cement, the mineral powder and the fly ash are matched in a specific proportion, so that the bonding strength of the recycled concrete slurry is improved, the structural stability of the recycled concrete is better, and the compressive strength of the recycled concrete is better.
Preferably, the water reducing agent comprises the following components in parts by mass:
1-2 parts of a polycarboxylic acid high-efficiency water reducing agent.
By adopting the technical scheme, the polycarboxylic acid high-efficiency water reducing agent has better compatibility with the cementing material, and can improve the fluidity of the recycled concrete slurry, so that diphenyl (trimethylsilyl) phosphine promotes better effect of the cementing material, calcium sulphoaluminate and calcium oxide permeating into gaps of the recycled aggregate, and further improves the gap filling effect of the recycled aggregate, thereby being beneficial to improving the compressive strength of the recycled concrete, being beneficial to pumping the recycled concrete slurry and ensuring that the operation of pouring the recycled concrete is more convenient.
Preferably, the water reducing agent further comprises the following components in parts by mass:
2-3 parts of ferric chloride.
By adopting the technical scheme, the iron chloride is matched with the polycarboxylic acid high-efficiency water reducing agent, so that the flowability of the recycled concrete slurry is further improved, the pumping performance of the recycled concrete is improved, and the construction of the recycled concrete slurry is facilitated.
In a second aspect, the present application provides a method for preparing recycled concrete, which adopts the following technical scheme:
a preparation method of recycled concrete comprises the following steps:
step (1), uniformly mixing a cementing material, diphenyl (trimethylsilyl) phosphine, a water reducing agent and water to form a premix;
step (2), adding natural aggregate, recycled aggregate, calcium sulphoaluminate and calcium oxide into the premix, and uniformly stirring to obtain recycled concrete slurry;
and (3) pouring the recycled concrete slurry on the steel frame framework, and maintaining to obtain recycled concrete.
By adopting the technical scheme, the cementing material, the diphenyl (trimethylsilyl) phosphine, the water reducing agent and the water are uniformly mixed firstly, so that the mixing and dispersing effects of the cementing material, the diphenyl (trimethylsilyl) phosphine and the water reducing agent are better, the natural aggregate, the regenerated aggregate and the calcium sulphoaluminate are added into the premix, the natural aggregate, the regenerated aggregate, the calcium sulphoaluminate and the calcium oxide are favorably and fully contacted with all components of the premix, the stacking density of the natural aggregate and the regenerated aggregate is better, the synergistic matching of the calcium sulphoaluminate, the calcium oxide, the diphenyl (trimethylsilyl) phosphine and the cementing material is favorably realized, gaps among the regenerated aggregates are better filled, and the compressive strength of the recycled concrete is improved.
Preferably, in the step (1), zinc oxide is further added when the gelling material, diphenyl (trimethylsilyl) phosphine, the water reducing agent and water are mixed.
By adopting the technical scheme, zinc oxide is added when the cementing material, diphenyl (trimethylsilyl) phosphine, the water reducing agent and water are mixed, so that the zinc oxide is uniformly dispersed in the premix, and the zinc oxide and the diphenyl (trimethylsilyl) phosphine are favorably cooperated to ensure that the compressive strength of the recycled concrete is better.
Preferably, in the step (2), the stirring time after the natural aggregate and the recycled aggregate are added is 3-6 min.
By adopting the technical scheme, the binding effect of the cementing material, the natural aggregate and the recycled aggregate is better, so that the compressive strength and the cracking resistance of the recycled concrete are better.
In summary, the present application has the following beneficial effects:
1. according to the method, the cementing material, the calcium sulphoaluminate, the calcium oxide, the diphenyl (trimethylsilyl) phosphine, the natural aggregate and the recycled aggregate are matched according to a specific proportion, and the diphenyl (trimethylsilyl) phosphine, the cementing material, the calcium oxide and the calcium sulphoaluminate can enter gaps in the recycled aggregate to fill the gaps in the recycled aggregate, so that the compression resistance of the recycled aggregate is improved, the recycled aggregate is not easy to crack, and meanwhile, the bonding stability between the recycled aggregates or between the recycled aggregate and the natural aggregate is improved, so that the compression strength and the cracking resistance of recycled concrete are improved.
2. The zinc oxide is preferably adopted in the application, the zinc oxide and diphenyl (trimethylsilyl) phosphine, the cementing material, the calcium oxide and the calcium sulphoaluminate have a better synergistic effect, so that the water permeability coefficient of the recycled concrete is further improved, and meanwhile, the filling effect of gaps of the recycled concrete is better, so that the recycled concrete is not easy to crack, and the compressive strength of the recycled concrete is improved.
3. According to the preparation method, the natural aggregate and the recycled aggregate are added and then stirred for 3-6min, so that the mixing effect of the cementing material, the natural aggregate and the recycled aggregate is better, and the compressive strength of the recycled concrete is better.
Detailed Description
The following is the source information for the raw materials of each example and comparative example:
the Portland cement is P.O42.5 Portland cement which is purchased from Yiji Dong cement, Inc. of inner Mongolia.
The mineral powder is S95 mineral powder and is purchased from a Ling shou Yixin product processing factory.
The fly ash is II-grade fly ash, and is purchased from Jiagong mineral products, Inc., Lingshu county.
Diphenyl (trimethylsilyl) phosphine was purchased from calix sinceri chemical ltd.
The polycarboxylic acid high-efficiency water reducing agent is purchased from HR-01 of Nantong Runfeng petrochemical company Limited.
The natural aggregate is natural granite aggregate, and the average grain diameter of the natural aggregate is 20-25 mm.
The recycled aggregate is formed by crushing waste building concrete, wherein a large amount of concrete fragments, a small amount of glass fragments, mud blocks and bricks are also arranged in the recycled aggregate, and the average grain diameter of the recycled aggregate is 8-10 mm.
Examples 1 to 5
The recycled concrete comprises a steel bar framework and recycled concrete slurry poured on the steel bar framework, wherein the recycled concrete slurry comprises the following components: the concrete comprises a cementing material, calcium sulphoaluminate, calcium oxide, diphenyl (trimethylsilyl) phosphine, natural aggregate, recycled aggregate, a water reducing agent and water.
The cementing material is the compound of Portland cement, mineral powder and fly ash.
The water reducing agent is one or two of polycarboxylic acid high-efficiency water reducing agent and ferric chloride.
In examples 1 to 5, the method for producing recycled concrete comprises the steps of:
step (1), firstly adding the cementing material, the polycarboxylic acid high-efficiency water reducing agent, the ferric chloride, the diphenyl (trimethylsilyl) phosphine and water into a stirring kettle, mixing, stirring for 5min at the rotating speed of 80r/min, and uniformly stirring to form a premix.
And (2) adding calcium sulphoaluminate, calcium oxide, natural aggregate and recycled aggregate into the premix, stirring for 3min at the rotating speed of 60r/min, and uniformly stirring to obtain recycled concrete slurry.
And (3) pouring the recycled concrete slurry on the built steel frame framework, and maintaining to obtain recycled concrete.
In examples 1 to 5, the amounts of the respective components to be charged are shown in Table 1 (unit kg).
TABLE 1
Example 6
The difference from example 2 is that:
in the step (1), Portland cement is adopted to replace mineral powder and fly ash in an equivalent manner.
Examples 7 to 8
The difference from example 2 is that: the recycled concrete slurry also includes zinc oxide.
In examples 7 to 8, the method for producing recycled concrete comprises the steps of:
step (1), adding the cementing material, the polycarboxylic acid high-efficiency water reducing agent, the ferric chloride, the diphenyl (trimethylsilyl) phosphine, the zinc oxide and water into a stirring kettle, mixing, stirring for 10min at the rotating speed of 90r/min, and uniformly stirring to form a premix.
And (2) adding calcium sulphoaluminate, calcium oxide, natural aggregate and recycled aggregate into the slurry, stirring for 6min at the rotating speed of 58r/min, and uniformly stirring to obtain recycled concrete slurry.
And (3) pouring the recycled concrete slurry on the built steel frame framework, and maintaining to obtain recycled concrete.
In examples 7 to 8, the amounts of the respective components to be charged are shown in Table 2 (unit kg).
TABLE 2
| Example 7 | Example 8 | |
| Portland cement | 100 | 100 |
| Mineral powder | 35 | 35 |
| Calcium sulphoaluminate | 2.5 | 2.5 |
| Calcium oxide | 1.5 | 1.5 |
| Diphenyl (trimethylsilyl) | 15 | 15 |
| Natural aggregate | 95 | 95 |
| Recycled aggregate | 235 | 235 |
| Polycarboxylic acid high-efficiency water reducing agent | 1.5 | 1.5 |
| Ferric chloride | 2.5 | 2.5 |
| Water (W) | 48 | 48 |
| Zinc oxide | 0.1 | 0.5 |
Comparative example 1
The difference from example 2 is that:
in the step (1), the diphenyl (trimethylsilyl) phosphine is equivalently replaced by portland cement.
Comparative example 2
The difference from example 2 is that:
in the step (1), Portland cement is adopted to replace calcium sulphoaluminate and calcium oxide in equal amount.
Experiment 1
The water permeability coefficient of each example and each comparative example is detected according to CJJ/T135-2009 technical Specification for Water permeable Cement concrete pavements.
Experiment 2
The 7d compressive strength (MPa) and the 28d compressive strength (MPa) of each example and each comparative example were measured according to GB/T50081-2002 Standard test methods for mechanical Properties of ordinary concrete.
The data for the tests of examples 1-2 are shown in Table 3.
TABLE 3
By comparing comparative example 1 and example 2 in table 3, the permeability coefficient of the recycled concrete is improved by adding diphenyl (trimethylsilyl) phosphine, which proves that the recycled concrete forms better continuous pore channels, is beneficial to the permeation of water, the compressive strength of the recycled concrete is improved, the gaps of the recycled aggregate can be greatly reduced after the diphenyl (trimethylsilyl) phosphine is added, and the bonding strength between the recycled aggregates is increased, so that the compressive capacity of the recycled concrete is enhanced.
Comparing comparative example 2 with example 2 in table 3, it can be seen that by adding calcium sulfoaluminate and calcium oxide, the water permeability coefficient of the recycled concrete is increased, the recycled concrete can maintain a better water permeability, and the compressive strength of the recycled concrete is increased, which proves that calcium sulfoaluminate and calcium oxide can enter into the gap of the recycled aggregate to fill the gap of the recycled concrete, so that the calcium sulfoaluminate and calcium oxide can better improve the strength of the recycled aggregate, thereby improving the compressive capacity of the recycled concrete.
Compared with the example 2, the comparative examples 1-3 in the table 3 can show that the water permeability coefficient of the recycled concrete is obviously improved, the water permeability of the recycled concrete is better improved, the compressive strength of the recycled concrete is improved, the recycled concrete can bear higher pressure, the recycled concrete is not easy to crack, and the recycled concrete has better durability when being used as a road surface, so that the service life of the recycled concrete is prolonged.
As can be seen from comparison of examples 4-5 and example 2 in Table 3, the compressive strength of the recycled concrete is further improved by adding the polycarboxylic acid high-efficiency water reducing agent to cooperate with ferric chloride, which proves that the compressive capacity of the recycled concrete can be improved by adding the polycarboxylic acid high-efficiency water reducing agent and ferric chloride.
By comparing the example 6 with the example 2 in the table 3, the permeability coefficient of the recycled concrete is improved to a certain extent by adding the mineral powder and the fly ash, so that the permeable effect of the recycled concrete is better, and the compressive strength of the recycled concrete is improved, so that the compressive capacity of the recycled concrete is improved.
As can be seen from comparison of examples 7 to 8 in table 3 with example 2, by adding zinc oxide and diphenyl (trimethylsilyl) phosphine, calcium sulfoaluminate, calcium oxide, and mineral powder and fly ash in a specific ratio to mix, the water permeability coefficient of the recycled concrete is further improved, which proves that the recycled concrete maintains better water permeability, and the compressive strength of the recycled concrete is further improved, which proves that the structural stability of the recycled concrete is further improved, so that the strength of the recycled concrete is better.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A recycled concrete characterized by: the concrete comprises a steel bar framework and recycled concrete slurry poured on the steel bar framework, wherein the recycled concrete slurry comprises the following components in parts by weight:
150 portions of cementing material 140;
2-3 parts of diphenyl (trimethylsilyl) phosphine;
1-2 parts of calcium oxide;
2-3 parts of calcium sulphoaluminate;
80-90 parts of natural aggregate;
330 portions and 340 portions of recycled aggregate;
45-52 parts of water;
3-5 parts of a water reducing agent;
0.1-0.5 part of zinc oxide;
the cementing material comprises the following components in parts by mass:
100 parts of Portland cement;
30-35 parts of mineral powder;
10-15 parts of fly ash.
2. Recycled concrete according to claim 1, characterized in that: the particle size of the recycled aggregate is 8-10 mm.
3. Recycled concrete according to claim 1 or 2, characterized in that: the particle size of the natural aggregate is 20-25 mm.
4. Recycled concrete according to claim 1, characterized in that: the water reducing agent comprises the following components in parts by mass:
1-2 parts of a polycarboxylic acid high-efficiency water reducing agent.
5. Recycled concrete according to claim 4, characterized in that: the water reducing agent also comprises the following components in parts by mass:
2-3 parts of ferric chloride.
6. A method of producing recycled concrete according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
step (1), uniformly mixing a cementing material, diphenyl (trimethylsilyl) phosphine, a water reducing agent and water to form a premix;
step (2), adding natural aggregate, recycled aggregate, calcium oxide and calcium sulphoaluminate into the premix, and uniformly stirring to obtain recycled concrete slurry;
and (3) pouring the recycled concrete slurry on the steel frame framework, and maintaining to obtain recycled concrete.
7. The method for producing recycled concrete according to claim 6, wherein: in the step (1), zinc oxide is added when the cementing material, diphenyl (trimethylsilyl) phosphine, the water reducing agent and water are mixed.
8. The method for producing recycled concrete according to claim 6, wherein: in the step (2), the stirring time after the natural aggregate and the recycled aggregate are added is 3-6 min.
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| CN107021700A (en) * | 2017-04-13 | 2017-08-08 | 越艳 | Concrete regenerating component containing building waste aggregate and preparation method thereof |
| CN107312037B (en) * | 2017-07-03 | 2019-07-05 | 浙江科技学院 | A kind of synthetic method of bidentate phosphine |
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