CN116217183B - Water-permeable construction waste regenerated base material and mixing and construction process thereof - Google Patents
Water-permeable construction waste regenerated base material and mixing and construction process thereof Download PDFInfo
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- CN116217183B CN116217183B CN202310508512.8A CN202310508512A CN116217183B CN 116217183 B CN116217183 B CN 116217183B CN 202310508512 A CN202310508512 A CN 202310508512A CN 116217183 B CN116217183 B CN 116217183B
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0038—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter
- C04B38/0041—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter the particulate matter having preselected particle sizes
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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
- C04B2111/00017—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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
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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
- C04B2111/40—Porous or lightweight materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Structural Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application provides a permeable construction waste regenerated base material which comprises the following components in parts by mass: 50-70 parts of building waste recycled aggregate, 30-50 parts of natural aggregate and a cementing material; the mass of the cementing material is 8% -11% of the sum of the mass of the construction waste recycled aggregate and the mass of the natural aggregate. The cementing material comprises cement, blast furnace slag, fly ash and silica fume, and the mass ratio of the cementing material is cement: blast furnace slag: fly ash: silica fume=65 to 83: 5-10: 10-20: 2-5; the total porosity of the permeable construction waste regenerated base material is 20-28%, the effective porosity is 18-23%, and the permeability coefficient is not less than 0.5mm/s. The permeable construction waste regenerated base material provided by the application can realize recycling economy of solid waste utilization while considering strength and water permeability, has excellent effect and is worthy of popularization.
Description
Technical Field
The application belongs to the field of building materials, and particularly relates to a permeable building waste regenerated base material and a mixing and construction process thereof.
Background
With the rapid development of urban construction in China, a large amount of construction waste is generated, and the conventional open-air stacking or simple landfill mode of the construction waste is not suitable for the requirement of sustainable development of the current society. The recycling of the construction waste can reduce the exploitation of a large amount of natural resources, saves the land occupation area, has good social, environmental and economic benefits, and has important significance for promoting the realization of carbon-to-peak carbon neutralization in China.
Meanwhile, in the rapid development of national economy and gradual expansion of urban scale, various problems such as urban waterlogging, water pollution, heat island effect and the like are becoming serious. In order to solve the above problems, construction of "sponge city" is beginning to be raised. One of the measures in sponge cities is to use a permeable pavement to replace a traditional impermeable pavement, so that pavement rainwater can quickly infiltrate downwards, and waterlogging is prevented. The permeable base layer uses an open-graded inorganic binder stabilizing material, the porosity is generally 15-23%, and the permeable base layer can meet the requirement of water permeability.
Therefore, the application of the construction waste to the recycling of the road base material is taken as a necessary trend, and the construction waste is brought into the research category of a part of domestic and foreign scholars and is put into some engineering application. But the research on the aspect of using the construction waste for the permeable substrate is not thorough at present.
Compared with natural aggregate, the building rubbish recycled aggregate has the characteristics of small density, high water absorption, easy crushing and the like, the permeable base material faces complex and changeable working environments, dust, soil and other particles can be deposited inside the pores of the permeable base material under the action of air and water flow, and the base material is disintegrated and collapsed, so that the water permeability of the permeable base material is reduced or even eliminated. Therefore, the design method, the mixing and construction process and the like of the mixing proportion of the permeable construction waste regenerated base material are important to the road performance. The permeable construction waste regenerated base material in the common technology often has a series of problems of insufficient material strength, poor water permeability and the like, and cannot meet engineering application requirements.
Disclosure of Invention
The application aims to solve the technical problems that the strength of a permeable type construction waste regenerated base material is insufficient and the permeability is poor in the conventional technology and cannot meet engineering application requirements, and provides a permeable type construction waste regenerated base material and a mixing and construction process thereof, wherein the permeable type construction waste regenerated base material comprises the following components in parts by mass: 50-70 parts of building waste recycled aggregate;
30-50 parts of natural aggregate;
the mass of the cementing material is 8% -11% of the sum of the mass of the construction waste recycled aggregate and the mass of the natural aggregate;
the mass ratio of the construction waste recycled aggregate with the particle size of 9.5-19 mm to the natural aggregate with the particle size of 9.5-19 mm is (0.48-1.25): 1, the mass ratio of the building waste recycled aggregate with the particle size of 19-26.5 mm to the natural aggregate with the particle size of 19-26.5 mm is (0.3-1): 1, a step of;
the cementing material comprises cement, blast furnace slag, fly ash and silica fume, wherein the mass of the cement is as follows: the mass of the blast furnace slag: the mass of the fly ash is as follows: mass=65-83: 5-10: 10-20: 2-5;
the total porosity of the permeable construction waste regenerated base material is 20-28%, the effective porosity is 18-23%, and the permeability coefficient is not less than 0.5mm/s.
Further, the composition of the permeable construction waste regenerated base material and the total porosity satisfy the following relationship:
the calculation formula of the full porosity comprises:wherein:
n 0 -the total porosity (%) of the water-permeable construction waste recycled base material;
v-volume of the permeable construction waste regenerated base material (cm) measured by volumetric method 3 ）；
m 0 Taking out the water permeable type construction waste regenerated base material from water, and drying (60 ℃ for 24 hours) or air drying for 48 hours to obtain the weight (g);
ρ t -theoretical maximum density (g/cm) of the water-permeable construction waste regenerated base material 3 ）；
Wherein, the calculation formula of the theoretical maximum density comprises:
wherein:
ρ t -the theoretical maximum density of the water-permeable construction waste regenerated base material;
P c -said gelling materialI.e. the mass percent (%) of the cementing material to the natural aggregate and the construction waste recycled aggregate;
r sa -the synthetic apparent relative density of the natural aggregate and the construction waste recycled aggregate;
r c -the relative density of the cement;
ρ w density of water (g/cm) 3 ) 1g/cm 3 。
Further, the composition of the permeable construction waste regenerated base material and the effective porosity satisfy the following relationship:
wherein:
n e -the effective porosity (%) of the water-permeable construction waste recycled base material;
v-volume of the permeable construction waste regenerated base material (cm) measured by volumetric method 3 ）；
m 1 -the weight (g) in water measured after 24 hours of immersion of the water permeable construction waste regenerated base material;
m 0 taking out the water permeable type construction waste regenerated base material from water, and drying (60 ℃ for 24 hours) or air drying for 48 hours to obtain the weight (g);
ρ w density of water (g/cm) 3 ）。
Further, the composition of the permeable construction waste recycled base material comprises one or more of concrete, red bricks, stones and ceramics, and the content of organic matters in the construction waste recycled aggregate is less than 2.0%, and the content of impurities is less than 0.5%.
Further, the natural aggregate comprises limestone, and the particle size of the natural aggregate is 9.5-26.5 mm.
Further, the cement comprises P.C 42.5 cement and/or P.O 42.5 cement;
the fly ash is class I fly ash and/or class II fly ash, and the specific surface area of the fly ash is not less than 450m 2 /kg；
The specific surface area of the blast furnace slag is not less than 500m 2 /kg；
The silica fume is siliceous ultrafine powder material, and the specific surface area of the silica fume is 20000-28000 m 2 /kg。
The application also provides a mixing process of the permeable construction waste regenerated base material, which comprises the following steps:
pretreatment: wetting the construction waste recycled aggregate before primary stirring for 12-24 hours until the water content of the construction waste recycled aggregate is more than or equal to 50% of saturated water absorption, so as to obtain a pretreatment;
primary stirring: mixing and stirring the pretreatment with a first part of cementing material and a first part of water to obtain a first-stage stirring material;
wherein the first part of the cementing material is part of the cementing materials in the cementing material, and the cementing materials except the first part of the cementing material in the cementing material are second part of the cementing materials; the mass of the first part of cementing material accounts for 25% -50% of the mass of the cementing material; the mass of the first part of water accounts for 30% -50% of the total water mass, the water except the first part of water in the total water is the second part of water, and the total water mass is 0.39-0.43 times of the gel material mass;
and (3) secondary stirring: and mixing and stirring the primary stirring object, the natural aggregate, the second part of cementing material and the second part of water to obtain the permeable construction waste regenerated base material.
Further, the stirring time of the primary stirring is 20-30 s, and the time of the secondary stirring is not less than 60s.
The application also provides a construction process of the permeable construction waste regenerated base material, which comprises the following steps:
paving the mixed material obtained by the mixing process according to any of the above steps according to a loose paving coefficient of 1.28-1.36, wherein the paving speed is 2.0-3.0 m/min;
sequentially performing initial pressing, re-pressing and light harvesting on the paved water-permeable construction waste regenerated base material; the rolling speed of the initial pressing stage is 1.5-2.0 km/h, and the rolling speeds of the re-pressing and the light receiving are 2.0-2.5 km/h.
Further, the construction process further comprises curing treatment after finishing light harvesting, and the curing treatment time is more than or equal to 7d.
Compared with the prior art, the application at least comprises the following advantages:
the application designs a permeable type construction waste recycled base material, based on the grading attenuation rule of the recycled base material (namely the permeable type construction waste recycled base material, which is the same as the above) caused by the crushing of natural aggregate and recycled aggregate, an optimal blending proportion design method suitable for the construction waste recycled aggregate is obtained, the utilization rate of the recycled aggregate is improved on the premise of ensuring the strength of the recycled base material, the characteristics of low density, high water absorption, easy crushing and the like of the construction waste recycled aggregate are overcome, and the recycled base material with the strength and the water permeability is constructed.
The application realizes the recycling of the building rubbish recycled aggregate, and cooperatively treats the industrial solid wastes such as blast furnace slag, fly ash, silica fume and the like, optimizes the cementing material system and improves the performance of the recycled base material; the recycling utilization rate and the economic added value of two major solid wastes, namely the construction waste and the industrial solid waste, are improved, the carbon emission is reduced, and the method has important significance for sustainable development of road engineering materials.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a permeable construction waste regenerated base material and a mixing and construction process thereof according to an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made in detail and with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
Moreover, the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the embodiments, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the scope of protection claimed by the present application.
Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs and to which this application belongs, and any method, apparatus, or material of the prior art similar or equivalent to the methods, apparatus, or materials described in the examples of this application may be used to practice the application.
The application provides a permeable construction waste regenerated base material which comprises the following components in parts by mass: 50-70 parts of building waste recycled aggregate;
30-50 parts of natural aggregate;
the mass of the cementing material is 8% -11% of the sum of the mass of the construction waste recycled aggregate and the mass of the natural aggregate;
in some embodiments, the construction waste recycled aggregate can comprise three grades of 4.75-9.5 mm, 9.5-19 mm and 19-26.5 mm according to the particle size, and the natural aggregate can comprise two grades of 9.5-19 mm and 19-26.5 mm according to the particle size.
The mass ratio of the recycled aggregate with the grain diameter of 9.5-19 mm to the natural aggregate with the grain diameter of 9.5-19 mm in the recycled base material can be (0.48-1.25): 1, the mass ratio of the recycled aggregate with the particle size of 19-26.5 mm to the natural aggregate with the particle size of 19-26.5 mm can be (0.3-1): 1.
by studying the change of grading curves of the regenerated base material before and after compaction under the action of engineering compaction, the survival probability of the regenerated base material under the action of the same compaction is higher as the grain size range of the aggregate is reduced, mainly because the stress contact area of the aggregate with larger grain size is larger, more stress is concentrated on the aggregate, and therefore, the particle breakage is easier to generate. Therefore, the application reduces the proportion of the recycled aggregate in the aggregate with large particle size, can effectively avoid excessive crushing of the recycled aggregate in the compacting process, and ensures that the grading range and mechanical property of the recycled base material meet engineering requirements.
The cementing material comprises cement, blast furnace slag, fly ash and silica fume, wherein the mass of the cement is as follows: the mass of the blast furnace slag: the mass of the fly ash is as follows: mass=65-83: 5-10: 10-20: 2-5.
Preferably, the permeable construction waste regenerated base material comprises the following components in parts by mass: 55-70 parts of building waste recycled aggregate;
30-45 parts of natural aggregate;
the mass of the cementing material is 8% -10% of the sum of the mass of the construction waste recycled aggregate and the mass of the construction waste recycled aggregate;
in some preferred embodiments, the mass ratio of the recycled aggregate with the particle size of 9.5-19 mm to the natural aggregate with the particle size of 9.5-19 mm in the recycled base material can be (0.85-0.95): 1, the mass ratio of the recycled aggregate with the grain size of 19-26.5 mm to the natural aggregate with the grain size of 19-26.5 mm can be (0.45-0.55): 1.
the cementing material comprises cement, blast furnace slag, fly ash and silica fume, wherein the mass of the cement is as follows: the mass of the blast furnace slag: the mass of the fly ash is as follows: mass=67-80: 5-10: 15-20: 3-5.
In some embodiments, the building rubbish recycled aggregate refers to recycled coarse aggregate obtained by crushing, impurity sorting, screening and other processes of urban demolition rubbish, and the main components of the recycled coarse aggregate comprise concrete, red bricks, stones, ceramics and the like, wherein the organic matter content is less than 2.0%, and the impurity content is less than 0.5%.
Natural aggregate generally refers to coarse aggregate obtained by crushing and screening limestone.
As the water-permeable construction waste regenerated base material is an open-graded base material, the application preferably adopts coarse aggregate with the grain diameter of more than 4.75mm, and the coarse aggregate is equally divided into three grades of 4.75-9.5 mm, 9.5-19 mm and 19-26.5 mm.
The cementing material is a material which can bond the bulk or block materials into a whole body in the process of changing the plastic slurry into a hard stone body through the physical and chemical actions of the cementing material, and is also called cementing material. Cement, blast furnace slag, fly ash and silica fume are preferably adopted to form the cementing material.
Preferably, the cement may be P.C 42.5.42.5 or P.O 42.5.42.5 cement. Wherein P.C 42.5.5 belongs to composite Portland cement, and the compressive strength obtained by the 28d compressive strength test is 42.5MPa; P.O 42.5.5 refers to ordinary Portland cement, and the compressive strength obtained by the 28d compressive strength test is 42.5MPa.
The fly ash can be class I fly ash and/or class II fly ash, and the specific surface area is not less than 450m 2 /kg. The fly ash can improve the later strength of the base material. The blast furnace slag can be obtained by grinding blast furnace ironmaking waste slag, and the specific surface area is not less than 500m 2 /kg. The blast furnace slag powder has higher activity, can cooperate with cement, and avoids the hidden trouble of cracking of the regenerated base material caused by too high cement content while ensuring the early strength of the regenerated base material.
The silica fume is SiO which can be generated by a metallurgical electric furnace at the high temperature of more than 2000 DEG C 2 And ultrafine silicon formed by rapid oxidation and condensation of Si gas and oxygen in airThe fineness of the silica fume is less than more than 80 percent of that of the silica fume, the average grain diameter is 0.1-0.3 mu m, and the specific surface area is 20000-28000 m 2 /kg. The high specific surface area of the silica fume can obviously improve the compression resistance, the impermeability, the impact resistance and other performances of the base material.
In some embodiments, the total porosity of the permeable construction waste regenerated base material is 20-28%, the effective porosity is 18-23%, and the permeability coefficient is not less than 0.5mm/s.
Full porosity refers to the percentage of pore volume in a bulk material to the total volume of the material in its natural state. The water permeability of the base layer material can be generally characterized.
The effective porosity refers to the calculated porosity after removing the ineffective void (i.e. the void blocked later), and can accurately represent the water permeability of the base material. The effective porosity should also meet the strength requirements and should not be too high or too low.
Preferably, when the effective porosity of the permeable construction waste regenerated base material is 18-23%, the permeability coefficient can meet the specification requirement of not less than 0.5mm/s.
The application has the following advantages:
the application designs a permeable type construction waste recycled base material, based on the grading attenuation rule of the recycled base material caused by the crushing of natural aggregate and recycled aggregate, an optimal blending proportion design method suitable for the construction waste recycled aggregate is obtained, the characteristics of low density, high water absorption, easy crushing and the like of the construction waste recycled aggregate are overcome, and the recycled base material with strength and water permeability is constructed.
The application realizes the recycling of the building rubbish recycled aggregate, and cooperatively treats the industrial solid wastes such as blast furnace slag, fly ash, silica fume and the like, optimizes the cementing material system and improves the performance of the recycled base material; the recycling utilization rate and the economic added value of two major solid wastes, namely the construction waste and the industrial solid waste, are improved, the carbon emission is reduced, and the method has important significance for sustainable development of road engineering materials.
The important reason that the regenerated base material designed by proportioning has the excellent properties is that according to the performance and design requirements of the regenerated base material, the application adopts the mixing ratio test based on the target porosity (comprising the full porosity and the effective porosity) and the loading density obtained by obtaining the test piece molding by the theoretical maximum density, thereby obtaining the base material proportioning with both the strength and the water permeability under the condition of minimum gelatinization dosage, and improving the utilization rate of the regenerated aggregate on the premise of ensuring the strength of the material.
In comparison, the meaning of obtaining the proportion of the base material based on the maximum dry density and the optimal water content test in the common technology is not great because-because the porosity of the skeleton-void base material is higher, in order to obtain the maximum dry density of the base material, coarse aggregate is crushed to fill gaps under the heavy compaction condition, the gradation of the base material is completely changed after the base material is molded, and the water permeability coefficient cannot meet the requirement at the moment.
Specifically, the calculation formula of the full porosity and the effective porosity includes:
wherein:
n 0 -the total porosity (%) of the water-permeable construction waste recycled base material;
n e -the effective porosity (%) of the water-permeable construction waste recycled base material;
v-volume of the permeable construction waste regenerated base material (cm) measured by volumetric method 3 ）；
m 1 -the weight (g) in water measured after 24 hours of immersion of the water permeable construction waste regenerated base material;
m 0 taking out the water permeable type construction waste regenerated base material from water, and drying (60 ℃ for 24 hours) or air drying for 48 hours to obtain the weight (g);
ρ w density of water (g/cm) 3 ）；
ρ t -theoretical maximum density (g/cm) of the water-permeable construction waste regenerated base material 3 ）。
The calculation formula of the theoretical maximum density of the water type construction waste regenerated base material comprises the following steps:
wherein:
ρ t -the theoretical maximum density of the water-permeable construction waste regenerated base material;
P c -the dosage of the cementing material, namely the mass percent (%) of the cementing material to the natural aggregate and the construction waste recycled aggregate;
r sa -the synthetic apparent relative density of the natural aggregate and the construction waste recycled aggregate;
r c -the relative density of the cement;
ρ w density of water (g/cm) 3 ) 1g/cm 3 。
As shown in FIG. 1, the application also provides a mixing process of the permeable construction waste regenerated base material, which comprises pretreatment, primary stirring and secondary stirring in sequence:
s1, pretreatment: and wetting the construction waste recycled aggregate before primary stirring for 12-24 hours until the water content of the construction waste recycled aggregate is more than or equal to 50% of saturated water absorption, so as to obtain a pretreatment.
Specifically, pretreatment refers to that a certain amount of water is sprayed in advance to moisten the recycled aggregate according to the water absorption of the recycled aggregate 12-24 hours before the production of the base material until the water content of the recycled aggregate is more than or equal to 50% of saturated water absorption, and the surface is free from obvious drying and whitening phenomena.
Because of the high water absorption of the recycled aggregate (namely the construction waste recycled aggregate), if the base material is not wetted in advance, the dry surface of the recycled aggregate in the mixing process is difficult to be coated with the cementing material, so that the base material is difficult to mix uniformly, and the bonding strength of the base material is reduced.
The pretreatment is carried out 12-24 hours before primary stirring, so that the recycled aggregate is fully wetted, the moisture is locked, part of the surface water of the recycled aggregate is volatilized in the waiting time, and the subsequent stirring effect of the base material is optimized.
The water spraying can be performed for a plurality of times, so that the surface of the recycled aggregate is fully wetted.
S2, primary stirring: mixing and stirring the pretreatment with a first part of cementing material and a first part of water to obtain a first-stage stirring material;
the cementing materials except the first part of cementing materials are second part of cementing materials, and the mass of the first part of cementing materials accounts for 25% -50% of the mass of the cementing materials; the mass of the first part of water accounts for 30% -50% of the total water mass, the water except the first part of water in the total water is the second part of water, and the total water mass is 0.39-0.43 times of the gel material mass.
Specifically, the pretreated material, the first part of the cementing material and the first part of water can be conveyed to a stirring cylinder to be subjected to one-time forced stirring for 20-30 seconds.
And (3) secondary stirring: and mixing and stirring the primary stirring object, the natural aggregate, the second part of cementing material and the second part of water to obtain the water permeable type construction waste regenerated base material.
Specifically, the primary stirring material, the natural aggregate, the second part of cementing material and the second part of water can be mixed and conveyed to a stirring cylinder to be subjected to secondary forced stirring for not less than 60 seconds, so as to obtain a uniformly mixed base material.
The mixing process of the application firstly wets the recycled aggregate of the building and then fully mixes the recycled aggregate with part of the cementing material, thereby effectively improving the service performance of the recycled aggregate. Then mixing with natural aggregate, residual cementing material and residual additional water, and improving the mixing uniformity to the maximum extent, and simultaneously, improving the regenerated aggregate to the same service performance of the new aggregate.
The application also provides a construction process of the permeable construction waste regenerated base material, which comprises the following steps:
s10, paving the mixed water-permeable construction waste regenerated base material according to a loose paving coefficient of 1.28-1.36, wherein the paving speed is 2.0-3.0 m/min.
Preferably, the mixing in the mixed water permeable construction waste regenerated base material can be any mixing process; the water permeable type construction waste regenerated base material in the mixed water permeable type construction waste regenerated base material can be any of the water permeable type construction waste regenerated base material.
The paving speed refers to the form speed of the paver during operation, and can be 2.0-3.0 m/min, and the paving speed in the range can reduce the segregation of regenerated base materials and ensure the quality.
The ratio of the loose thickness of the loose coefficient material to the compaction thickness reaching the specified compactness can be 1.28-1.36, and the loose coefficient in the range can meet the requirements of the thickness and the compactness of the base layer.
Specifically, the mixed base material can be transported to the site and evenly paved according to the loose paving thickness immediately; the speed of the paver is kept constant and the paver is continuously paved in the paving process.
In some embodiments, the paving machine of the base material may be a water-stable or asphalt base material paving machine.
In other embodiments, the design thickness may be 150mm to 200mm, and the paving thickness of the base material is the product of the loose paving coefficient and the design thickness value.
S20, sequentially performing initial pressing, re-pressing and light receiving on the paved water permeable construction waste regenerated base material.
In some embodiments, the rolling speed in the initial rolling stage can be controlled to be 1.5-2.0 km/h, and uniform rolling is performed;
the rolling speed in the re-pressing and light-receiving stage can be controlled to be 2.0-2.5 km/h, and the construction segregation caused in the rolling process is effectively reduced.
Specifically, the initial pressing includes: when rolling, firstly, static pressure is carried out for 1 time by using a steel wheel road roller, and then static pressure is carried out for 1 time after flatness correction is qualified.
The re-pressing comprises the following steps: and rolling for 4-6 times by using a heavy-duty rubber-wheel road roller, and then hydrostatic pressing for 2-3 times by using a heavy-duty steel-wheel vibratory road roller until the compaction degree is qualified.
In other embodiments, the rolling equipment may include 1-2 steel wheel rollers with working mass above 13t, 1-2 heavy-duty rubber wheel rollers with working mass above 30t, and 1-2 heavy-duty steel wheel vibratory rollers with dead weight above 22 t.
Because the crushing value of the recycled aggregate is larger, in order to prevent the recycled aggregate from being crushed in a large amount in the rolling process, the effective porosity and strength cannot meet the design requirements, the heavy steel wheel vibratory roller is only static-pressure-free and does not need vibration, and the kneading rolling of the heavy rubber wheel vibratory roller is enhanced.
In some embodiments, the construction process further comprises a curing treatment after the light receiving is completed, and the duration of the curing treatment is more than or equal to 7d. Proper temperature and humidity conditions are created for the base material, and the hardening of the base material is efficiently promoted.
By way of example, the means of curing may include a cover curing which may include one or more of a moisture curing film cover, a gunny bag cover sprinkler, a plastic film sprinkler, a geotextile cover sprinkler, a wet sand and sprinkler, a straw curtain cover sprinkler, a emulsified asphalt sprinkler.
To facilitate a further understanding of the application by those skilled in the art, reference is now made to the accompanying drawings, in which:
example 1:
a permeable construction waste regenerated base material and a mixing and construction process thereof are as follows:
(1) Blending ratio of regenerated base material
55 parts of construction waste recycled aggregate, 45 parts of natural aggregate and 9 parts of cementing material;
the mass ratio of the recycled aggregate with the grain diameter of 9.5-19 mm to the natural aggregate with the grain diameter of 9.5-19 mm in the base material is 0.5:1, the mass ratio of the recycled aggregate with the particle size of 19-26.5 mm to the natural aggregate with the particle size of 19-26.5 mm is 0.33:1.
the cementing material comprises the following components: and (3) cement: blast furnace slag: fly ash: silica fume=76: 5:15:4, a step of;
the water-gel ratio was 0.41 and the total water mass was about 3.7 parts.
(2) Recycled aggregate pretreatment
Before the first stirring, 3.3 parts by mass of water is sprayed to wet the recycled aggregate for 24 hours, so that the water content of the recycled aggregate reaches the saturated water absorption, and the surface of the recycled aggregate is free from obvious drying and white exposure.
(3) Blending of regenerated base material
First, the mixture was stirred for one step, and 55 parts by mass of the pretreated recycled aggregate, 3 parts by mass of the first partial cementing material and 1.85 parts by mass of the first partial water were fed into the stirring vessel, followed by one-step forced stirring for 30 seconds. And then carrying out secondary stirring, conveying 45 parts by mass of natural aggregate, the rest 6 parts by mass of second part of cementing material, the primary stirring object and the rest 1.85 parts by mass of second part into a secondary stirring cylinder, carrying out secondary forced stirring for 60 seconds to obtain a fully and uniformly mixed permeable construction waste regenerated base material, and observing and recording the mixing state of the base material.
(4) Paving, rolling and health preserving of regenerated base material
And transporting the mixed base material to a construction site through an automobile, and paving the base material by using 2 pavers, wherein the paving thickness is 234mm, and the paving speed is 2.0m/min. Rolling is started after each 30m of the material is paved: firstly, static pressure is carried out for 2 times on a steel wheel road roller, and the rolling speed is 1.5km/h; then rolling for 5 times by a heavy-duty rubber-tired road roller at a rolling speed of 2.0km/h; finally, static pressure is carried out for 3 times by using a heavy steel wheel vibratory roller, and the rolling speed is 2.0km/h; total number of rolling passes was 10.
And (3) timely curing after rolling, wherein the curing period is 7 days, the curing mode is that the water-saving moisturizing curing film covers the curing, traffic is sealed during the curing, and vehicles are forbidden to pass.
Example 2
A permeable construction waste regenerated base material and a mixing and construction process thereof are as follows:
(1) Blending ratio of regenerated base material
60 parts of building waste recycled aggregate, 40 parts of natural aggregate and 9.5 parts of cementing material;
the mass ratio of the recycled aggregate with the grain diameter of 9.5-19 mm to the natural aggregate with the grain diameter of 9.5-19 mm in the recycled base material is 0.7:1, the mass ratio of the recycled aggregate with the particle size of 19-26.5 mm to the natural aggregate with the particle size of 19-26.5 mm is 0.5:1.
the cementing material comprises the following components: and (3) cement: blast furnace slag: fly ash: silica fume=79: 8:10:3, a step of;
the water-gel ratio was 0.42 and the total water mass was about 4 parts.
(2) Recycled aggregate pretreatment
Before the first stirring, 3.6 parts by mass of water is sprayed to wet the recycled aggregate for 24 hours, so that the water content of the recycled aggregate reaches 90% of saturated water absorption, and the surface of the aggregate is free from obvious drying and whitening phenomena.
(3) Base material mixing
First, the mixture was stirred for one step, and 60 parts by mass of the pre-moistened recycled aggregate, 3.25 parts by mass of the first partial cementing material and 2.0 parts by mass of the first partial water were fed into the stirring tank, followed by one-step forced stirring for 30 seconds. And then carrying out secondary stirring, conveying 40 parts by mass of natural aggregate, the rest 6.25 parts by mass of second part of cementing material, the materials in the primary stirring cylinder and the rest 2.0 parts by mass of second part of water into the secondary stirring cylinder, carrying out secondary forced stirring for 60 seconds, obtaining the fully and uniformly mixed water-permeable construction waste regenerated base material, and observing and recording the mixing state of the base material.
(4) Spreading, rolling and health preserving of base material
The base material paving, rolling and curing method is the same as that of the embodiment 1.
Example 3
A permeable construction waste regenerated base material and a mixing and construction process thereof are as follows:
(1) Blending ratio of regenerated base material
70 parts of building waste recycled aggregate, 30 parts of natural aggregate and 10 parts of cementing material;
the mass ratio of the recycled aggregate with the grain diameter of 9.5-19 mm to the natural aggregate with the grain diameter of 9.5-19 mm in the base material is 1.25:1, the mass ratio of the recycled aggregate with the particle size of 19-26.5 mm to the natural aggregate with the particle size of 19-26.5 mm is 1:1.
the cementing material comprises the following components: and (3) cement: blast furnace slag: fly ash: silica fume=67: 10:18:5, a step of;
the water-gel ratio is 0.42, and the total water mass is about 4.2 parts.
(2) Recycled aggregate pretreatment
Before primary stirring for 24 hours, 4.1 parts by mass of water is sprayed to wet the recycled aggregate, so that the water content of the recycled aggregate reaches 90% of saturated water absorption, and the surface of the recycled aggregate is free from obvious drying and white exposure.
(3) Blending of regenerated base material
First, the mixture was stirred for one step, and 70 parts by mass of the pre-moistened recycled aggregate, 4.5 parts by mass of the first partial cementing material and 2.1 parts by mass of the first partial water were fed into the stirring tank, followed by one-step forced stirring for 30 seconds. And then carrying out secondary stirring, conveying 30 parts by mass of natural aggregate, the rest 5.5 parts by mass of second part of cementing material, the materials in the primary stirring cylinder and the rest 2.1 parts by mass of second part of water into the secondary stirring cylinder, carrying out secondary forced stirring for 60 seconds, obtaining the fully and uniformly mixed permeable construction waste regenerated base material, and observing and recording the mixing state of the base material.
(4) Paving, rolling and health preserving of regenerated base material
The base material paving, rolling and curing method is the same as that of the embodiment 1.
Comparative example 1
For the convenience of comparing the effects of the application, for example 3, the mass ratio of the recycled aggregate to the natural aggregate in the three particle size ranges (4.75-9.5 mm, 9.5-19 mm and 19-26.5 mm) in this comparative example is 7:3. all other things were consistent with example 3.
Comparative example 2
To facilitate comparison of the inventive effects, the base material of this comparative example was subjected to compaction test (i.e., maximum dry density and optimum moisture content test) to obtain a base material blend ratio for example 3, all other things being consistent with example 3.
Comparative example 3
For the convenience of comparing the effects of the application, for example 3, only the material mixing ratio is changed, cement is used as the cementing material, other materials and proportions are unchanged, and the mixing of the base materials and the construction process are kept consistent.
Comparative example 4
For the convenience of comparing the effects of the application, the comparative example was directed to example 3 in which the recycled aggregate was not pre-wetted, and the recycled aggregate was a construction waste recycled aggregate having no pre-wetted and dried surface; the stirring mode of the base material adopts disposable stirring; the material mixing ratio and the construction process were the same as in example 3.
Comparative example 5
For the convenience of comparing the effects of the application, for example 3, the construction process of the base material of the comparative example adopts steel wheel vibration compaction, and correspondingly reduces the number of rolling passes of the heavy rubber wheel. The rolling process is as follows: firstly, static pressure is carried out for 2 times on a steel wheel road roller, and the rolling speed is 1.5km/h; then rolling for 3 times by a heavy-duty rubber-tired road roller at a rolling speed of 2.0km/h; finally, vibrating and dynamic and static compaction is carried out for 3 times by using a heavy steel wheel vibratory roller, wherein the rolling speed is 2.0km/h; total number of rolling passes was 8.
Observing the finished base materials of the above examples and comparative examples, and recording the mixing state of the base materials; sampling to perform 7d unconfined compressive strength test and water permeability coefficient test; and (5) carrying out on-site basal layer coring after curing for 7 days, and observing the integrity of the core sample.
The specific results are shown in Table 1:
as can be seen from Table 1, (1) the strength of the base materials in examples 1, 2 and 3 is above 4.0MPa, the water permeability coefficient is greater than 0.5mm/s, the design and specification requirements are met, the mixing state of the base materials is uniform, and the core sample is complete; (2) example 3 compared with comparative example 1, after the proportion of the recycled aggregate in the aggregate with large particle size is reduced, the recycled aggregate is crushed and reduced in the compaction process, and the strength and water permeability of the base material are improved; (3) compared with comparative example 2, the base material obtained by adopting the mix proportion design method based on the target void ratio and the theoretical maximum density has better water permeability, and the method is more suitable for the water permeable base material; (4) example 3 compared with comparative example 3, the strength of the base material is not reduced after the cementing material is replaced by part of industrial solid waste, and the feasibility of using the industrial solid waste to replace cement for the road base material is high; (5) compared with comparative example 4, the embodiment 3 has the advantages that the recycled aggregate is pretreated and the stirring process is added for one time, so that the mixing state of the base material is obviously improved, the mixing is more uniform, and the strength of the molded test piece of the base material is also higher; (6) example 3 compared with comparative example 5, the use of vibratory compaction increases the degree of aggregate fragmentation, and filling the voids of the base material after aggregate fragmentation results in a decrease in water permeability coefficient, so that the rolling process should be fully static pressure, enhancing the kneading action of the heavy-duty rubber-tyred roller.
In the above technical solution of the present application, the above is only a preferred embodiment of the present application, and therefore, the patent scope of the present application is not limited thereto, and all the equivalent structural changes made by the description of the present application and the content of the accompanying drawings or the direct/indirect application in other related technical fields are included in the patent protection scope of the present application.
Claims (10)
1. The permeable construction waste regenerated base material is characterized by comprising the following components in parts by mass: 50-70 parts of building waste recycled aggregate;
30-50 parts of natural aggregate;
the mass of the cementing material is 8% -11% of the sum of the mass of the construction waste recycled aggregate and the mass of the natural aggregate;
the mass ratio of the construction waste recycled aggregate with the particle size of 9.5-19 mm to the natural aggregate with the particle size of 9.5-19 mm is (0.48-1.25): 1, the mass ratio of the building waste recycled aggregate with the particle size of 19-26.5 mm to the natural aggregate with the particle size of 19-26.5 mm is (0.3-1): 1, a step of;
the cementing material comprises cement, blast furnace slag, fly ash and silica fume, wherein the mass of the cement is as follows: the mass of the blast furnace slag: the mass of the fly ash is as follows: mass=65-83: 5-10: 10-20: 2-5;
the total porosity of the permeable construction waste regenerated base material is 20-28%, the effective porosity is 18-23%, and the permeability coefficient is not less than 0.5mm/s.
2. The water permeable type construction waste recycling base material according to claim 1, wherein the composition of the water permeable type construction waste recycling base material and the total porosity satisfy the following relationship:
the calculation formula of the full porosity comprises:
％
wherein:n 0 -the total porosity of the permeable construction waste regenerated base material is in units of;
v-the volume of the permeable construction waste regenerated base material measured by a quantitative volumetric method is in cm 3 ；
m 0 The permeable construction waste regenerated base material is taken out of water and then dried or air-dried for 48 hours, and the unit is g;
ρ t -the theoretical maximum density of the permeable construction waste regenerated base material is in g/cm 3 ；
Wherein, the calculation formula of the theoretical maximum density comprises:
wherein:
ρ t -the theoretical maximum density of the water-permeable construction waste regenerated base material;
P c the dosage of the cementing material, namely the mass percentage of the cementing material to the natural aggregate and the building rubbish recycled aggregate, is shown in the unit;
r sa -the synthetic apparent relative density of the natural aggregate and the construction waste recycled aggregate;
r c -the relative density of the cement;
ρ w density of water in g/cm 3 1g/cm 3 。
3. The water permeable type construction waste recycling base material according to claim 2, wherein the composition of the water permeable type construction waste recycling base material and the effective porosity satisfy the following relationship:
%
wherein:
n e -the effective porosity of the permeable construction waste regenerated base material is given in units of;
v-the volume of the permeable construction waste regenerated base material measured by a quantitative volumetric method is in cm 3 ；
m 1 The weight of the permeable construction waste regenerated base material in water measured after 24 hours of soaking is measured in g;
m 0 the permeable construction waste regenerated base material is taken out of water and then dried or air-dried for 48 hours, and the unit is g;
ρ w density of water in g/cm 3 。
4. The permeable construction waste recycled base material according to claim 1, wherein the permeable construction waste recycled base material comprises one or more of concrete, red bricks, stones and ceramics, and the organic matter content in the construction waste recycled aggregate is less than 2.0% and the impurity content is less than 0.5%.
5. The water permeable type construction waste recycling base material according to claim 1, wherein the natural aggregate comprises limestone, and the particle size of the natural aggregate is 9.5-26.5 mm.
6. The water permeable construction waste recycling base material according to claim 1, wherein the cement comprises P.C 42.5.5 cement and/or P.O 42.5.42.5 cement;
the fly ash is class I fly ash and/or class II fly ash, and the specific surface area of the fly ash is not less than 450m 2 /kg；
The specific surface area of the blast furnace slag is not less than 500m 2 /kg；
The silica fume is siliceous ultrafine powder material, and the specific surface area of the silica fume is 20000-28000 m 2 /kg。
7. A process for mixing the permeable construction waste regenerated base material according to any one of claims 1 to 6, comprising:
pretreatment: wetting the construction waste recycled aggregate before primary stirring for 12-24 hours until the water content of the construction waste recycled aggregate is more than or equal to 50% of saturated water absorption, so as to obtain a pretreatment;
primary stirring: mixing and stirring the pretreatment with a first part of cementing material and a first part of water to obtain a first-stage stirring material;
wherein the first part of the cementing material is part of the cementing materials in the cementing material, and the cementing materials except the first part of the cementing material in the cementing material are second part of the cementing materials; the mass of the first part of cementing material accounts for 25% -50% of the mass of the cementing material; the mass of the first part of water accounts for 30% -50% of the total water mass, the water except the first part of water in the total water is the second part of water, and the total water mass is 0.39-0.43 times of the gel material mass;
and (3) secondary stirring: and mixing and stirring the primary stirring object, the natural aggregate, the second part of cementing material and the second part of water to obtain the permeable construction waste regenerated base material.
8. The mixing process according to claim 7, wherein the primary stirring time is 20-30 s, and the secondary stirring time is not less than 60s.
9. The construction process of the permeable construction waste regenerated base material is characterized by comprising the following steps of:
paving the mixing material obtained by the mixing process according to claim 7 or 8 according to a loose paving coefficient of 1.28-1.36, wherein the paving speed is 2.0-3.0 m/min;
sequentially performing initial pressing, re-pressing and light harvesting on the paved water-permeable construction waste regenerated base material; the rolling speed of the initial pressing stage is 1.5-2.0 km/h, and the rolling speeds of the re-pressing and the light receiving are 2.0-2.5 km/h.
10. The construction process according to claim 9, further comprising a curing treatment after the completion of the light harvesting, wherein the curing treatment has a duration of not less than 7d.
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