CN110981329A - Fiber-reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material and preparation method thereof - Google Patents
Fiber-reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material and preparation method thereof Download PDFInfo
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
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- 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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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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
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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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Abstract
The invention provides a fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material and a preparation method thereof, wherein the pavement base material consists of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, and comprises the following components in parts by weight: 800-1000 parts of fully-regenerated brick-concrete aggregate; 24-70 parts of cement; 8.0-20 parts of fly ash; 120 portions of water and 170 portions of water; 0.4-1.0 part by weight of fiber; 0.2 to 0.7 weight portion of water reducing agent. The pavement base material provided by the invention completely replaces natural gravels with the fully recycled brick-concrete aggregate produced by dismantling brick-concrete buildings, has rich raw materials, low cost, environmental protection and economy, has higher tensile strength, dry shrinkage deformation resistance and good working performance on the basis of meeting various technical requirements of the current specification on the pavement base, and effectively prolongs the service life of roads.
Description
Technical Field
The invention belongs to the field of road engineering materials, and particularly relates to a fiber reinforced cement fly ash stabilized fully recycled brick-concrete aggregate pavement base material and a preparation method thereof.
Background
While large-scale infrastructure construction is carried out in China, two major risks which cannot be ignored exist: firstly, construction projects consume a large amount of non-renewable resources. The total concrete yield in China exceeds 20 hundred million m3The amount of sand required to mix concrete alone is approaching 60 million tons per year. Secondly, a large number of building structures are out of service in advance due to factors such as city updating and transformation or performance degradation. According to statistics, the amount of construction waste generated in China is about 25-35 hundred million tons every year, and the amount of construction waste in the past year exceeds 200 hundred million tons. At present, only less than 10 percent of construction waste is processed and reused in China; in developed countries and regions, the utilization rate of construction waste in the netherlands and belgium in the european union reaches more than 95%, and the resource utilization rate of korean and japanese construction waste is about 97%. And most of demolition buildings at the present stage in China are brick-concrete buildings, brick-concrete waste is difficult to be directly used as gravel to mix concrete again after being crushed due to complex components, most of the brick-concrete waste is only temporarily stacked or simply buried, and the problems of resource, energy and environmental protection caused by the brick-concrete waste are more obvious.
The cement stabilized macadam semi-rigid base course is the most common semi-rigid base course and is widely applied to pavement base courses of roads of all levels and urban roads in China. In the prior art, the urban road construction takes natural gravels as main raw materials, the ecological environment can be seriously damaged by exploiting a large amount of natural gravels, and the price of the gravels is increased gradually all over the country in recent years, so that the construction cost of road construction projects is increased, and the progress of basic engineering construction is not facilitated. The cement stabilizing layer has lower technical requirements relative to structural concrete, so the cement stabilizing layer can be used as a main way for large-scale resource utilization of brick-concrete wastes, and the recycled brick-concrete aggregate generated by using the brick-concrete building wastes in road construction engineering can completely replace natural gravel, so that the road construction cost can be reduced, the exploitation of natural resources can be reduced, and the problem of disposal and utilization of a large amount of brick-concrete building wastes can be effectively solved. However, the recycled aggregate is often low in strength and contains gypsum, wood blocks, fine powder and the like, so that when the recycled aggregate is applied to a cement stabilized pavement base in actual engineering, the problems of low modulus of the base, insufficient tensile strength, drying shrinkage cracking and the like are often caused, so that reflection cracks of an asphalt surface layer are caused, and the service life of road engineering is greatly shortened. Therefore, the cement stabilized recycled aggregate material suitable for the pavement base layer has higher tensile strength and deformation resistance on the basis of meeting the compressive strength required by the specification, and the cement stabilized recycled aggregate pavement base layer material on the market at present cannot meet the requirements in practical application.
CN108689659A discloses a cement-stabilized construction waste regeneration mixture and a preparation method thereof, the raw materials are cement, water, regenerated aggregates with the specification of 19-31.5 mm, 9.5-19 mm, 4.75-9.5 mm and 0-4.75 mm, and the cement-stabilized construction waste mixture obtained finally has the characteristics of high strength, simple preparation method and low production cost, but the crack resistance and durability of the mixture are not considered; CN101619557A discloses a roadbed constructed by using brick-concrete type construction waste regenerated aggregates and a construction method thereof, wherein a regenerated inorganic binder stabilizing material layer is a regenerated inorganic binder stabilizing material layer formed by mixing brick-concrete type construction waste regenerated aggregate particles, common aggregates and alkaline gelling powder, although part of the regenerated inorganic binder stabilizing material layer is doped with brick-concrete type construction waste to improve the utilization rate of the regenerated inorganic binder stabilizing material layer, the problems of insufficient tensile strength and dry shrinkage cracking of a base material caused by the brick-concrete type construction waste when the regenerated inorganic binder stabilizing material layer is applied to actual engineering are not considered; CN102503312A discloses a polyvinyl alcohol fiber-doped reinforced cement stabilized macadam pavement base material, which utilizes polyvinyl alcohol fibers to improve the crack resistance of the cement stabilized macadam material, but does not consider the characteristics of high water absorption and low strength of recycled aggregate, and the polyvinyl alcohol fibers can cause the problems of increased water consumption and reduced working performance of the base material.
Therefore, to solve the series of problems, the cement stabilized recycled aggregate base material is required to have better working performance while improving the tensile strength and the dry shrinkage deformation resistance on the basis of higher compressive strength.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the fiber reinforced cement fly ash stable fully-recycled brick-concrete aggregate pavement base material and the preparation method thereof, the fully-recycled brick-concrete aggregate produced by dismantling brick-concrete buildings is completely replaced by natural sandstone by the base material, the raw materials are rich, the cost is low, the environment is protected, the economy is realized, the tensile strength, the dry shrinkage deformation resistance and the good working performance are realized on the basis of meeting various technical requirements of the current specification on the road base, and the service life of a road is effectively prolonged.
The invention is realized by adopting the following technical scheme:
the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material consists of recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the material comprises the following components in parts by weight:
in the technical scheme, the addition amount of the cement is preferably 40-55 parts by weight; the addition amount of the fly ash is 10-14 parts by weight; the addition amount of the fiber is 0.45-0.65 weight part; the addition amount of the water reducing agent is 0.3-0.5 part by weight.
Preferably, the mass ratio of the cement to the fully recycled brick-concrete aggregate is 1 (14-30), and the mass ratio of the fiber to the fully recycled brick-concrete aggregate is 1 (1000-2000).
More preferably, the mass ratio of the cement to the fully recycled brick-concrete aggregate is 1 (20-22), so that the compressive strength, the tensile strength and the dry shrinkage deformation resistance of the finally obtained pavement base material can be balanced. If the cement is added too much, the dry shrinkage deformation resistance of the pavement base material is reduced, and if the cement is added too little, the compressive strength of the pavement base material is insufficient. The mass ratio of the fiber to the fully recycled brick-concrete aggregate is 1 (1500) -1800, so that the tensile strength, the dry shrinkage deformation resistance and the working performance of the finally obtained pavement base material can be balanced. If the fiber is added too much, the workability of the base pavement material is lowered, and if the fiber is added too little, the tensile strength and the dry shrinkage resistance of the base pavement material are insufficient.
Preferably, the fully-recycled brick-concrete aggregate is produced after demolishing a brick-concrete building and mainly comprises concrete aggregate, clay brick aggregate, old mortar, ceramic tiles, wood blocks and other impurities, and the content of each component in the recycled brick-concrete aggregate is 30-50% of the concrete aggregate, 10-30% of the clay brick aggregate, 5-15% of the old mortar and 0-10% of the impurities.
More preferably, the fully recycled brick-concrete aggregate comprises recycled brick-concrete aggregate with the particle size of 19.0-31.5 mm, recycled brick-concrete aggregate with the particle size of 9.5-19 mm, recycled brick-concrete aggregate with the particle size of 4.75-9.5 mm, recycled brick-concrete aggregate with the particle size of 0.075-4.75 mm and recycled brick-concrete aggregate with the particle size of 0-0.075, wherein the proportion of the aggregate with the particle size is that the recycled brick-concrete aggregate with the particle size of 19.0-31.5 mm: 9.5-19 mm recycled brick-concrete aggregate: 4.75-9.5 mm recycled brick-concrete aggregate: 0.075-4.75 mm of recycled brick-concrete aggregate: 0-0.075mm recycled brick-concrete aggregate 10-20%: 20% -30%: 20% -30%: 25% -35%: 0 to 5 percent.
Preferably, the cement is portland cement, and the strength grade is not lower than 42.5 grade; the fly ash is secondary fly ash; the fiber is any one or combination of more of polypropylene fiber, polyvinyl alcohol fiber, glass wool fiber or mineral wool; the water reducing agent is any one or a combination of a plurality of polycarboxylic acid water reducing agents, aliphatic water reducing agents, amino water reducing agents and naphthalene water reducing agents.
More preferably, the fiber is polypropylene fiber, and the adding amount of the fiber is 0.5-0.6 part by weight; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 25-30%
The invention also provides a preparation method of the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material, which comprises the following steps:
step 1, adding fully-recycled brick-concrete aggregates with different particle sizes in proportion, and uniformly mixing;
step 2, adding cement, fly ash and fibers into the mixed fully-recycled brick-concrete 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 cement-stabilized recycled brick-concrete aggregate pavement base material.
In the above technical scheme, preferably, in the step 1, the recycled brick-concrete aggregate with different particle sizes is air-dried or sun-dried and then added; in the step 3, the material sealing time is 20-30 minutes.
Compared with the prior art, the invention has the following beneficial effects:
(1) in the invention, the coarse and fine aggregates are all fully recycled brick-concrete aggregates generated by brick-concrete building wastes, and natural sandstone aggregates are not doped, so that the brick-concrete building wastes can be greatly utilized, the utilization efficiency is improved, and the problem of disposal and utilization of the brick-concrete building wastes is solved.
(2) The recycled brick-concrete aggregate in the cement-stabilized fully-recycled brick-concrete aggregate pavement base material is generated by crushing brick-concrete building wastes, and impurities such as concrete aggregate, clay brick aggregate, old mortar, ceramic tiles, wood blocks and the like in the recycled brick-concrete aggregate are not required to be separated and selected, so that the process of machine separation and processing is reduced, the aggregate source is rich, and the preparation is simple; the fully recycled brick-concrete aggregate used in the invention contains recycled powder with the specification of 0-0.075mm, and the recycled powder contains unhydrated cement mortar, particles with hydration activity and the like, so that the compressive strength, bending tensile strength and fatigue resistance of the cement-stabilized fully recycled brick-concrete aggregate pavement base material can be obviously enhanced, and a new way is provided for large-scale utilization of the recycled powder in the construction waste.
(3) In the invention, the fly ash is added, so that the working performance of the base material can be improved, the drying shrinkage deformation of the base material can be reduced, the later strength development of the base material can be improved, and the cost can be reduced by partially replacing cement; the added fiber can improve the tensile and dry shrinkage deformation resistance of the base material on the basis of ensuring the compressive strength of the base material; the water reducing agent is added, so that the water consumption can be reduced on the premise of ensuring the construction performance of the base material, and the strength of the base material is improved. The splitting tensile strength of the pavement base material provided by the invention can be improved by adding the fly ash, the fiber and the water reducing agent, and the drying shrinkage deformation of the pavement base material is reduced, so that the pavement base material has longer service life. The addition amount of the fly ash is limited to be 8-20 parts by weight, the addition amount of the fiber is 0.4-1.0 part by weight, the addition amount of the water reducing agent is 0.2-0.7 part by weight, the addition amounts of the fly ash, the fiber and the water reducing agent are too much or too little to meet the application requirements, and when at least one of the fly ash, the fiber and the water reducing agent is too little, the tensile strength and the dry shrinkage resistance of a base material are greatly influenced, so that the dry shrinkage cracking is caused; when at least one of the three materials is excessive, the compressive strength of the base material is low, the technical requirement of the specification on unconfined compressive strength cannot be well met, and meanwhile, the working performance is reduced, so that the construction application is not facilitated.
(4) In the invention, the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1 (14-30), and the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1 (1000-2000), so that the compressive strength, the tensile strength, the dry shrinkage deformation resistance and the working performance of the finally obtained pavement base material can be balanced. If the cement is added too much, the dry shrinkage deformation resistance of the pavement base material is reduced, and if the cement is added too little, the compressive strength of the pavement base material is insufficient. When the fibers are added into the pavement base material, the working performance of the base material during preparation can be reduced, and the tensile and dry shrinkage deformation resistance of the base material can be properly improved by selecting the proper proportion of the fibers and the fully-recycled brick-concrete aggregate so as to achieve the balance of strength and workability.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material consists of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1:30, the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1:2000, and the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material comprises the following components in parts by weight:
wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate, 15%: 25%: 25%: 30%: 5 percent of cement, 42.5-grade portland cement, second-grade fly ash, polypropylene fiber and polycarboxylic acid water reducer.
The preparation method comprises the following steps:
step 1, drying the fully recycled brick-concrete aggregate with different particle sizes in the sun, adding the dried fully recycled brick-concrete aggregate in proportion, and uniformly mixing
Step 2, adding cement, fly ash and fiber into the mixed fully-recycled brick-concrete 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 for 20 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Example 2
A fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material is composed of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1:25, the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1:1800, and the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material comprises the following components in parts by weight:
wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate, which is 20%: 20%: 25%: 30%: 5 percent of cement, 42.5-grade portland cement, second-grade fly ash, polypropylene fiber and polycarboxylic acid water reducer.
The preparation method comprises the following steps:
step 1, air-drying the fully recycled brick mixed aggregate with different particle sizes, adding the materials in proportion, and uniformly mixing
Step 2, adding cement, fly ash and fiber into the mixed fully-recycled brick-concrete 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 for 25 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Example 3
The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material consists of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1:22, the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1:1700, and the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate comprises the following components in parts by weight:
wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate, 15%: 20%: 30%: 30%: 5 percent of cement, 42.5-grade portland cement, second-grade fly ash, polypropylene fiber and polycarboxylic acid water reducer.
The preparation method comprises the following steps:
step 1, air-drying the fully recycled brick mixed aggregate with different particle sizes, adding the materials in proportion, and uniformly mixing
Step 2, adding cement, fly ash and fiber into the mixed fully-recycled brick-concrete 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 for 25 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Example 4
The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material consists of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1:20, the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1:1600, and the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material comprises the following components in parts by weight:
wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate is 10%: 30%: 25%: 30%: 5 percent of cement, 42.5-grade portland cement, second-grade fly ash, polyvinyl alcohol fiber and polycarboxylic acid water reducer.
The preparation method comprises the following steps:
step 1, air-drying the fully recycled brick mixed aggregate with different particle sizes, adding the materials in proportion, and uniformly mixing
Step 2, adding cement, fly ash and fiber into the mixed fully-recycled brick-concrete 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 for 30 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Example 5
The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material consists of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1:18, the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1:1500, and the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate comprises the following components in parts by weight:
wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate, 15%: 25%: 25%: 30%: 5 percent of cement, 42.5-grade portland cement, second-grade fly ash, polyvinyl alcohol fiber and polycarboxylic acid water reducer.
The preparation method comprises the following steps:
step 1, air-drying the fully recycled brick mixed aggregate with different particle sizes, adding the materials in proportion, and uniformly mixing
Step 2, adding cement, fly ash and fiber into the mixed fully-recycled brick-concrete 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 for 30 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Example 6
The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material consists of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1:17, the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1:1400, and the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material comprises the following components in parts by weight:
wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate, 15%: 25%: 25%: 32%: 3 percent of cement, 42.5-grade portland cement, second-grade fly ash, glass wool fiber and polycarboxylic acid water reducer.
The preparation method comprises the following steps:
step 1, air-drying the fully recycled brick mixed aggregate with different particle sizes, adding the materials in proportion, and uniformly mixing
Step 2, adding cement, fly ash and fiber into the mixed fully-recycled brick-concrete 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 for 30 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Example 7
The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material consists of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1:15, the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1:1200, and the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate comprises the following components in parts by weight:
wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate, which is 20%: 20%: 25%: 32%: 3 percent of cement, 42.5-grade portland cement, second-grade fly ash, mineral wool fiber and polycarboxylic acid water reducer.
The preparation method comprises the following steps:
step 1, air-drying the fully recycled brick mixed aggregate with different particle sizes, adding the materials in proportion, and uniformly mixing
Step 2, adding cement, fly ash and fiber into the mixed fully-recycled brick-concrete 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 for 30 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Example 8
The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material consists of fully-recycled brick-concrete aggregate, cement, fly ash, water, fiber and a water reducing agent, wherein the mass ratio of the cement to the fully-recycled brick-concrete aggregate is 1:14, the mass ratio of the fiber to the fully-recycled brick-concrete aggregate is 1:1000, and the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material comprises the following components in parts by weight:
wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate, 15%: 25%: 25%: 30%: 5 percent of cement, 42.5-grade portland cement, second-grade fly ash, mineral wool fiber and polycarboxylic acid water reducer.
The preparation method comprises the following steps:
step 1, air-drying the fully recycled brick mixed aggregate with different particle sizes, adding the materials in proportion, and uniformly mixing
Step 2, adding cement, fly ash and fiber into the mixed fully-recycled brick-concrete 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 for 30 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Comparative example
The embodiment is a cement stabilized fully-recycled brick-concrete aggregate pavement base material without fibers, fly ash and water reducing agent materials, which is composed of fully-recycled brick-concrete aggregate, cement and water, and the cement stabilized fully-recycled brick-concrete aggregate pavement base material comprises the following components in parts by weight:
1000 parts by weight of fully recycled brick-concrete aggregate
40 parts by weight of cement
175 parts by weight of water
Wherein, the full regeneration brick mixes aggregate regeneration brick and mixes the aggregate and produces for demolising broken back of brick and concrete class building, contains that the particle diameter is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate, 9.5 ~ 19 mm's full regeneration brick mixes the aggregate, 4.75 ~ 9.5 mm's full regeneration brick mixes the aggregate, 0.075 ~ 4.75 mm's full regeneration brick mixes the aggregate, 0 ~ 0.075's full regeneration brick mixes the aggregate, and each particle diameter proportion is 19.0 ~ 31.5 mm's full regeneration brick mixes the aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-concrete aggregate, 15%: 25%: 25%: 30%: 5 percent of the cement and 42.5-grade portland cement.
The preparation method comprises the following steps:
step 1, air-drying the fully recycled brick mixed aggregate with different particle sizes, adding the materials in proportion, and uniformly mixing
Step 2, adding cement into the mixed fully-recycled brick-concrete aggregate, and uniformly mixing
And 3, pouring water into the mixture, uniformly mixing, and carrying out material sealing for 30 minutes to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
Performance testing
According to the test regulation of inorganic binder stabilizing materials for highway engineering (JTG E51-2009), the performance tests of the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base layer materials provided in examples 1-8 and the cement stabilized fully-recycled brick-concrete aggregate pavement base layer materials provided in the comparative example are carried out, wherein the performance tests comprise 7d unconfined compressive strength, splitting tensile strength and total drying shrinkage coefficient, and the slump is tested according to the standard of the performance test method of common concrete mixtures GBT 50080-2016.
The results are shown in Table 1:
TABLE 1
The embodiment and the performance test show that the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base layer material provided by the invention has the advantages of high tensile strength in splitting, low drying shrinkage deformation and good fluidity, has higher tensile strength, high dry shrinkage deformation resistance and good working performance on the basis of meeting the unconfined compressive strength requirement of the existing specification on the pavement base layer, and effectively prolongs the service life of a road.
As can be seen from the comparison between examples 1-2 and examples 3-4, the mass ratio of the cement to the fully recycled brick-concrete aggregate is preferably 1 (14-30), more preferably 1 (20-22), and in this case, the pavement base material finally obtained by the invention has more excellent unconfined compressive strength and splitting tensile strength. As can be seen from the comparison between examples 2-5 and examples 6-8, the mass ratio of the preferred fiber to the fully recycled brick-concrete aggregate in the invention is 1 (1000-.
The applicant states that the present invention is illustrated by the above examples to describe the preparation method of the fiber reinforced cement fly ash stabilized fully recycled brick and concrete aggregate pavement base material of the present invention, but the present invention is not limited to the above detailed method, i.e. it does not mean that the present invention must be implemented by the above detailed method. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material is characterized by comprising the following components in parts by weight:
2. the fiber reinforced cement fly ash stabilized fully recycled brick and concrete aggregate pavement base material as claimed in claim 1, wherein the addition amount of the cement is 40-55 parts by weight; the addition amount of the fly ash is 10-14 parts by weight; the addition amount of the fiber is 0.45-0.65 weight part; the addition amount of the water reducing agent is 0.3-0.5 part by weight.
3. The fiber reinforced cement fly ash stabilized fully recycled brick and concrete aggregate pavement base material as claimed in claim 1, wherein the mass ratio of the cement to the fully recycled brick and concrete aggregate is 1 (14-30), and the mass ratio of the fiber to the fully recycled brick and concrete aggregate is 1 (1000-2000).
4. The fiber reinforced cement fly ash stabilized fully recycled brick and concrete aggregate pavement base material as claimed in claim 3, wherein the mass ratio of the cement to the fully recycled brick and concrete aggregate is 1 (20-22), and the mass ratio of the fiber to the fully recycled brick and concrete aggregate is 1 (1500-.
5. The fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material as claimed in claim 1, wherein the fully-recycled brick-concrete aggregate is produced after demolishing a brick-concrete building, and the contents of the components in the fully-recycled brick-concrete aggregate are 30-50% of concrete aggregate, 10-30% of clay brick aggregate, 5-15% of old mortar and 0-10% of impurities.
6. The fiber reinforced cement fly ash stabilized fully recycled brick-concrete aggregate pavement base material according to claim 5, wherein the fully recycled brick-concrete aggregate comprises 19.0-31.5 mm full recycled brick-concrete aggregate, 9.5-19 mm full recycled brick-concrete aggregate, 4.75-9.5 mm full recycled brick-concrete aggregate, 0.075-4.75 mm full recycled brick-concrete aggregate, 0-0.075 full recycled brick-concrete aggregate, and the proportion of each particle size is 19.0-31.5 mm full recycled brick-concrete aggregate: 9.5-19 mm of fully-recycled brick-concrete aggregate: 4.75-9.5 mm of fully-recycled brick-concrete aggregate: 0.075-4.75 mm of fully-recycled brick-concrete aggregate: 0-0.075mm of fully-recycled brick-mixed aggregate is 10-20%: 20% -30%: 20% -30%: 25% -35%: 0 to 5 percent.
7. The fiber reinforced cement fly ash stabilized fully recycled brick and concrete aggregate pavement base material according to claim 1, wherein the cement is portland cement, and the strength grade is not lower than 42.5 grade; the fly ash is secondary fly ash; the fiber is any one or combination of more of polypropylene fiber, polyvinyl alcohol fiber, glass wool fiber or mineral wool; the water reducing agent is any one or a combination of a plurality of polycarboxylic acid water reducing agents, aliphatic water reducing agents, amino water reducing agents and naphthalene water reducing agents.
8. The fiber-reinforced cement fly ash stabilized fully recycled brick-concrete aggregate pavement base material according to claim 7, wherein the fiber is polypropylene fiber, and the addition amount of the fiber is 0.5-0.6 parts by weight; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 25-30%.
9. The method of preparing a fiber cement fly ash stabilized fully recycled brick and concrete aggregate pavement base material according to any one of claims 1 to 8, wherein the method of preparing comprises:
step 1), adding the fully recycled brick-concrete aggregate with different particle sizes in proportion, and uniformly mixing;
step 2), adding cement, fly ash and fibers into the mixed fully-recycled brick-concrete aggregate, and uniformly mixing;
and 3) dissolving a water reducing agent into water, pouring the water reducing agent into the mixture, uniformly mixing and sealing the mixture to obtain the cement-stabilized fully-recycled brick-concrete aggregate pavement base material.
10. The method for preparing the fiber reinforced cement fly ash stabilized fully-recycled brick-concrete aggregate pavement base material according to claim 9, wherein in the step 1), the fully-recycled brick-concrete aggregates with different particle sizes are added after being dried in the sun or in the air; in the step 3), the material sealing time is 20-30 minutes.
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