CN114394810A - Construction waste regenerated pavement base material and preparation method thereof - Google Patents
Construction waste regenerated pavement base material and preparation method thereof Download PDFInfo
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- CN114394810A CN114394810A CN202210125858.5A CN202210125858A CN114394810A CN 114394810 A CN114394810 A CN 114394810A CN 202210125858 A CN202210125858 A CN 202210125858A CN 114394810 A CN114394810 A CN 114394810A
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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
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
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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
- 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
-
- 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
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Road Paving Structures (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a construction waste recycled pavement base material, and relates to the technical field of roadbed materials; the construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 8-15 parts of slag: 5-20 parts of a solvent; red gangue: 8-12 parts of a solvent; fiber: 2-5 parts; the alkali activator is: 3-6 parts; the water reducing agent is as follows: 0.3-0.5 part; the balance being construction waste recycled aggregate; the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
Description
Technical Field
The invention relates to the technical field of roadbed materials, in particular to a construction waste regenerated pavement base material and a preparation method thereof.
Background
The construction industry, one of the prop industries of national economy in China, plays an important role in the process of modern construction, but the flourishing development of the construction industry also brings a large amount of construction waste. According to statistics, the amount of the construction waste generated in 2016 years exceeds 26 hundred million tons, the regeneration utilization rate is only about 5%, and the yield of the construction waste can reach the peak value in 2020. The construction waste mainly comes from: digging and arranging the land for planting, backfilling, landscaping and the like; production of building materials; excess materials and waste materials in the building construction process; dismantling an old building; house collapse caused by natural disasters such as earthquake, tsunami and the like. The cement stabilized macadam is used as one of semi-rigid base materials, and is widely applied to asphalt pavement bases due to high strength, good integrity and good durability. In the thin rule of highway pavement base construction technology JTGTF 20-2015, the compressive strength standards of the base course and the subbase of the expressway and the first-level highway are respectively 3.0-5.0 MPa and 2.0-4.0 MPa; the compressive strength standards of the base layer and the subbase layer of the second-level and subbase roads are respectively 2.0-4.0 MPa and 1.0-3.0 MPa. The standard requirement of the compressive strength is not high, so that concrete, bricks, mortar blocks and the like in the construction waste are sorted out and crushed to proper gradation to prepare regenerated aggregate, and the regenerated aggregate can be partially or completely used for replacing natural aggregate to be used as a pavement cement stabilized macadam base layer or a subbase layer.
The regenerated pavement base material prepared by the prior art often has the phenomenon that the strength can not meet the requirement, and the construction waste regenerated pavement base material and the preparation method thereof are provided for solving the technical problem.
Disclosure of Invention
The invention aims to provide a construction waste recycled pavement base material and a preparation method thereof, and aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the construction waste regenerated pavement base material comprises the following raw materials in parts by weight:
slaked lime or/and cement: 8 to 15 parts of (A) a water-soluble polymer,
slag: 5-20 parts of a solvent;
red gangue: 8-12 parts of a solvent;
fiber: 2-5 parts;
the alkali activator is: 3-6 parts;
the water reducing agent is as follows: 0.3-0.5 part;
the balance being construction waste recycled aggregate;
the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
As a further scheme of the invention: the construction waste regenerated pavement base material comprises the following raw materials in parts by weight:
slaked lime or/and cement: 10-13 parts of (a) a water-soluble polymer,
slag: 9-16 parts of a solvent;
red gangue: 9-11 parts;
fiber: 3-4 parts;
the alkali activator is: 4-5 parts;
the water reducing agent is as follows: 0.35-0.45 part;
the balance being construction waste recycled aggregate.
As a still further scheme of the invention: the construction waste regenerated pavement base material comprises the following raw materials in parts by weight:
slaked lime or/and cement: 12 parts of (a) to (b),
slag: 13 parts;
red gangue: 10 parts of (A);
fiber: 4 parts of a mixture;
the alkali activator is: 4.5 parts;
the water reducing agent is as follows: 0.4 part;
the balance being construction waste recycled aggregate.
As a still further scheme of the invention: the alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
As a still further scheme of the invention: the fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
As a still further scheme of the invention: the fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
As a still further scheme of the invention: the water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
As a still further scheme of the invention: the construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
As a still further scheme of the invention: the grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
Another object of the present invention is to provide a method for preparing a body, comprising the steps of:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag, red gangue, fiber and an alkali activator into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Compared with the prior art, the invention has the beneficial effects that: the slag, the red gangue, the fiber and the alkali activator used in the invention can be better suitable for being used as the base material of the construction waste recycled aggregate. The pavement base material provided by the invention has high strength and good recovery effect. After the sample is damaged, the alkali activator and the mineral admixture at the crack are subjected to hydration reaction after being subjected to standard curing for 14 days, the crack is repaired by the hydration product, and the strength of the sample is obviously restored.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to specific embodiments.
Example 1
The construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 15 parts of slag: 20 parts of (1); red gangue: 12 parts of (1); fiber: 5 parts of a mixture; the alkali activator is: 6 parts of (1); the water reducing agent is as follows: 0.5 part; the balance being construction waste recycled aggregate;
the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
The alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
The fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
The water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
The construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
The grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
A preparation method of a construction waste regenerated pavement base material comprises the following steps:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag, red gangue, fiber and an alkali activator into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Example 2
The construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 8 parts of slag: 5 parts of a mixture; red gangue: 8 parts of a mixture; fiber: 2 parts of (1); the alkali activator is: 3 parts of a mixture; the water reducing agent is as follows: 0.3 part; the balance being construction waste recycled aggregate;
the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
The alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
The fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
The water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
The construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
The grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
A preparation method of a construction waste regenerated pavement base material comprises the following steps:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag, red gangue, fiber and an alkali activator into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Example 3
The construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 13 parts of slag: 16 parts of a mixture; red gangue: 11 parts of (1); fiber: 4 parts of a mixture; the alkali activator is: 5 parts of a mixture; the water reducing agent is as follows: 0.45 part; the balance being construction waste recycled aggregate; the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
The alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
The fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
The water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
The construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
The grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
A preparation method of a construction waste regenerated pavement base material comprises the following steps:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag, red gangue, fiber and an alkali activator into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Example 4
The construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 10 parts of slag: 9 parts of (1); red gangue: 9 parts of (1); fiber: 3 parts of a mixture; the alkali activator is: 4 parts of a mixture; the water reducing agent is as follows: 0.35 part; the balance being construction waste recycled aggregate; the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
The alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
The fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
The water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
The construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
The grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
A preparation method of a construction waste regenerated pavement base material comprises the following steps:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag, red gangue, fiber and an alkali activator into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Example 5
The construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 12 parts of slag: 13 parts; red gangue: 10 parts of (A); fiber: 4 parts of a mixture; the alkali activator is: 4.5 parts; the water reducing agent is as follows: 0.4 part; the balance being construction waste recycled aggregate; the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
The alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
The fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
The water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
The construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
The grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
A preparation method of a construction waste regenerated pavement base material comprises the following steps:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag, red gangue, fiber and an alkali activator into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Comparative example 1
The construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 12 parts of slag: 13 parts; red gangue: 10 parts of (A); the alkali activator is: 4.5 parts; the water reducing agent is as follows: 0.4 part; the balance being construction waste recycled aggregate; the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
The alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
The fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
The water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
The construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
The grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
A preparation method of a construction waste regenerated pavement base material comprises the following steps:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag and red gangue into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Comparative example 2
The construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 12 parts of slag: 13 parts; fiber: 4 parts of a mixture; the alkali activator is: 4.5 parts; the water reducing agent is as follows: 0.4 part; the balance being construction waste recycled aggregate; the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
The alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
The fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
The water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
The construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
The grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
A preparation method of a construction waste regenerated pavement base material comprises the following steps:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag and fibers into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Comparative example 3
The construction waste regenerated pavement base material comprises the following raw materials in parts by weight: slaked lime or/and cement: 12 parts of slag: 13 parts; red gangue: 10 parts of (A); fiber: 4 parts of a mixture; water reducing agent: 0.4 part; the balance being construction waste recycled aggregate; the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
The alkali activator consists of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
The fiber is any one or combination of a plurality of glass wool fiber, mineral wool, polypropylene fiber or polyvinyl alcohol fiber.
The water reducing agent is any one or combination of more of an amino water reducing agent, a naphthalene water reducing agent, a polycarboxylic acid water reducing agent and an aliphatic water reducing agent.
The construction waste recycled aggregate is classified into four grades according to the particle size of the aggregate for grading; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
The grading proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are respectively 10-15%, 20-25%, 20-40% and 20-50%.
A preparation method of a construction waste regenerated pavement base material comprises the following steps:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag, red gangue, fiber and an alkali activator into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
Performance test
The products of examples 1-5 and comparative examples 1-3 were molded into unconfined compressive strength test pieces with a compaction degree of 96% at a value near the optimum water content (+ -2%), cured for 56d under standard curing conditions (temperature 20 + -2 ℃, humidity greater than 95%), subjected to strength testing, stopped immediately after the test pieces cracked, cured for 14d under standard curing conditions again, and subjected to strength testing, with the test results shown in table 1.
The slag, the red gangue, the fiber and the alkali activator used in the invention can be better suitable for being used as the base material of the construction waste recycled aggregate. The pavement base material provided by the invention has high strength and good recovery effect. After the sample is damaged, the alkali activator and the mineral admixture at the crack are subjected to hydration reaction after being subjected to standard curing for 14 days, the crack is repaired by the hydration product, and the strength of the sample is obviously restored.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (9)
1. The construction waste regenerated pavement base material is characterized by comprising the following raw materials in parts by weight:
slaked lime or/and cement: 8 to 15 parts of (A) a water-soluble polymer,
slag: 5-20 parts of a solvent;
red gangue: 8-12 parts of a solvent;
fiber: 2-5 parts;
the alkali activator is: 3-6 parts;
the water reducing agent is as follows: 0.3-0.5 part;
the balance being construction waste recycled aggregate;
the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete.
2. The construction waste recycled pavement base material as claimed in claim 1, which comprises the following raw materials in parts by weight:
slaked lime or/and cement: 10-13 parts of (a) a water-soluble polymer,
slag: 9-16 parts of a solvent;
red gangue: 9-11 parts;
fiber: 3-4 parts;
the alkali activator is: 4-5 parts;
the water reducing agent is as follows: 0.35-0.45 part;
the balance being construction waste recycled aggregate.
3. The construction waste recycled pavement base material as claimed in claim 1, which comprises the following raw materials in parts by weight:
slaked lime or/and cement: 12 parts of (a) to (b),
slag: 13 parts;
red gangue: 10 parts of (A);
fiber: 4 parts of a mixture;
the alkali activator is: 4.5 parts;
the water reducing agent is as follows: 0.4 part;
the balance being construction waste recycled aggregate.
4. The building waste recycled pavement base material as claimed in claim 1, wherein the alkali activator is composed of water glass and sodium hydroxide, and the mass ratio of the alkali activator to the sodium hydroxide is 2: 1-4: 1.
5. The construction waste recycled pavement base course material as claimed in claim 1, wherein the fibers are any one or combination of glass wool fibers, mineral wool, polypropylene fibers or polyvinyl alcohol fibers.
6. The construction waste recycled pavement base material as claimed in claim 1, wherein the water reducing agent is any one or a combination of several of amino water reducing agent, naphthalene water reducing agent, polycarboxylic acid water reducing agent and aliphatic water reducing agent.
7. The construction waste recycled pavement base material according to claim 1, wherein the construction waste recycled aggregate is graded into four grades according to the size of the aggregate particle diameter; the grain size of the first grade aggregate is 0-4.75 mm, the grain size of the second grade aggregate is 4.75-9.5 mm, the grain size of the third grade aggregate is 9.5-19 mm, and the grain size of the fourth grade aggregate is 19-31.5 mm.
8. The construction waste recycled pavement base material of claim 1, wherein the proportions of the first grade aggregate, the second grade aggregate, the third grade aggregate and the fourth grade aggregate in the construction waste recycled aggregate are 10-15%, 20-25%, 20-40% and 20-50%, respectively.
9. A method for preparing the construction waste recycled pavement base material as claimed in any one of claims 1 to 8, comprising the steps of:
adding the building garbage recycled aggregate with different particle sizes in proportion, and uniformly mixing;
adding slaked lime or/and cement, slag, red gangue, fiber and an alkali activator into the mixed construction waste recycled aggregate, and uniformly mixing;
and (3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing, and carrying out material sealing to obtain the construction waste regenerated pavement base material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024039342A3 (en) * | 2022-08-17 | 2024-03-21 | T.C. Marmara Üni̇versi̇tesi̇ | Production of new generation binder construction material from combination of marble waste and blast furnace slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024039342A3 (en) * | 2022-08-17 | 2024-03-21 | T.C. Marmara Üni̇versi̇tesi̇ | Production of new generation binder construction material from combination of marble waste and blast furnace slag |
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