CN114804763A - Fiber-reinforced recycled aggregate pervious concrete - Google Patents
Fiber-reinforced recycled aggregate pervious concrete Download PDFInfo
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- CN114804763A CN114804763A CN202210386242.3A CN202210386242A CN114804763A CN 114804763 A CN114804763 A CN 114804763A CN 202210386242 A CN202210386242 A CN 202210386242A CN 114804763 A CN114804763 A CN 114804763A
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- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- NAIXASFEPQPICN-UHFFFAOYSA-O p-nitrophenylphosphocholine Chemical compound C[N+](C)(C)CCOP(O)(=O)OC1=CC=C([N+]([O-])=O)C=C1 NAIXASFEPQPICN-UHFFFAOYSA-O 0.000 description 1
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Images
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a fiber-reinforced recycled aggregate pervious concrete, which is prepared by adopting the following formula: cement 270- 3 355-450kg/m 3 100- 3 1360 and 1950kg/m coarse aggregate 3 The recycled aggregate accounts for 35 to 100 percent, and the polymer emulsion accounts for 0 to 30kg/m 3 0-9.6kg/m of water reducing agent 3 0-5kg/m of high-performance additive 3 The water-cement ratio is 0.24-0.42, the grout-bone ratio is 1:3.8-1:4.7, the maximum nominal particle size of coarse aggregate is 5-20mm, the pervious concrete is prepared by recycled aggregate, the carbon emission of the ground and pavement paving material in the whole life cycle is further reduced, meanwhile, the construction waste and solid waste are effectively utilized, the breaking strength and toughness of the pervious pavement layer are greatly improved by the fiber reinforcement technology, the production is carried out in a breakthrough manner by adopting a premixing mode, the production efficiency is greatly improved, and the quality stability of the pervious concrete product is ensured to a greater extent.
Description
Technical Field
The invention relates to the technical field of green low-carbon environment-friendly building materials, in particular to fiber-reinforced recycled aggregate pervious concrete.
Background
The pervious concrete, also called permeable concrete, sand-free macroporous concrete (previous concrete or pore concrete or no-fines concrete), is a special concrete which does not contain or contains less fine aggregates, has higher interconnected porosity (15% -30%), larger nominal pore diameter (2-8 mm) and water permeability coefficient of 2-6 mm/s. The preparation of pervious concrete follows three basic principles: coarse aggregates with a narrow particle size range, no or little fine aggregates, controlled amounts of slurry and generally low water-gel ratios.
The pervious concrete can be divided into eight varieties according to main raw materials, and is divided into primary aggregate pervious concrete and recycled aggregate pervious concrete according to the types of aggregates, and is divided into common pervious concrete and polymer modified pervious concrete according to whether polymers are doped or not, and is divided into primary aggregate pervious concrete, namely NPC, primary aggregate polymer pervious concrete, namely NPPC, recycled aggregate pervious concrete, namely RPC, recycled aggregate and polymer pervious concrete, and further called RPPC according to two comprehensive categories.
The research and application of the pervious concrete have been over thirty years of history so far, and the special concrete not only effectively plays the roles of flood control and drainage, but also avoids the loss of rainfall and effectively supplies the groundwater. Meanwhile, the pervious concrete can also filter and adsorb impurities and pollutants in surface water to a certain extent. Researchers have proved through experimental studies that pervious concrete has the function of purifying seawater and sewage. These works show that the pervious concrete plays an important role in the current civil engineering of 'five-water co-treatment' developed in a plurality of areas in China, and plays an irreplaceable important role in the aspects of sponge city construction, urban and rural green development, urban and rural landscape, and landscape improvement and landform improvement.
In fact, the function of the pervious concrete is not limited to the above, researchers introduce nano-titanium dioxide (nano-TiO 2) photocatalyst on the surface of the pervious concrete in different ways to eliminate and degrade atmospheric pollutants by utilizing the principle of photocatalytic reaction, and since the pervious concrete contains more stable intercommunicating pores, the pervious concrete is very suitable to be used as a carrier of the photocatalyst, the researches find that the common non-pervious paving material can only reflect sound waves and cannot play a role in absorbing sound and reducing noise, the water-pervious paving can obviously improve urban sound environment by means of the specific sound absorption and noise reduction mechanism, and the porous structure of the pervious concrete can effectively reduce the tire noise of vehicle driving, so that the harm of traffic noise is relieved.
Porosity is the most important technical performance index of pervious concrete, however, the definition, classification of porosity and which porosity index should be used in particular to characterize the hydraulic properties of pervious concrete is still rather confusing at present, and in fact not all the pores of pervious concrete are able to let liquid pass effectively, some of them are not connected with other pores and therefore are not significant for water penetration, and in addition, there are some smaller pores, such as capillary pores and closed pores, which retain liquid due to surface tension and capillary action and therefore are not able to transport fluid effectively, but these pores affect the strength of pervious concrete, we believe that the pore system of pervious concrete should be clearly distinguished into effective porosity and total porosity, by the ratio of the volume of the accessible pores (connected pores) to the total volume of the material, the total porosity is the ratio of the total pore volume to the total volume of the material, and determines the strength of the pervious concrete, and the total porosity takes into account the total volume of the non-accessible pores and the accessible pores, wherein the volume of the non-accessible pores can be further divided into non-accessible pores in the aggregate and non-accessible pores in the slurry (hardened set cement).
From the analysis of materials, the 'strength' and 'water permeability coefficient' of the pervious concrete are a pair of contradictions: in the same raw material and mixing ratio design system, increasing the water permeability often means decreasing the strength. In order to improve the water permeability without sacrificing the strength, one of the effective ways is to use functional components and additives. Although the variety of functional materials and additives is various, the actual effects are not sufficient, and the actual effects vary according to specific research, application configuration and conditions, so that the conditions are often contradictory, and unified knowledge and conclusions cannot be established. The problem is not well related to the technical standards (including product standards, detection method standards and application technical standards) of pervious concrete. This is also the root cause for the failure of the engineering application of pervious concrete to develop adequately. Therefore, the main contradiction is grasped, the key performance is improved, and the promotion of the standardization of the pervious concrete is the problem to be solved at present.
With the gradual implementation of 'carbon peak reaching' and 'carbon neutralization' in the building field, the preparation, production and application of the pervious concrete must be more environment-friendly and energy-saving than the prior art, and the problems of fully utilizing the existing resources and reducing carbon emission and carbon footprint must be considered besides fully playing the basic functions of the pervious concrete and paving materials. The recycling of the waste concrete is realized in large scale in the common concrete after years of continuous exploration. The research on the use of recycled aggregate in the preparation of pervious concrete has been carried out in recent years, and the research on recycled aggregate pervious concrete is reviewed in Shiliguang and Pingxiangbo in the text "research progress on recycled aggregate pervious concrete". The object is limited to recycled aggregate obtained by crushing construction waste concrete, and the recycled aggregate is not separately related to concrete processing discarded by a pre-mixer manufacturer. Considering the difference in origin and properties, it is necessary to treat them differently, and research is carried out specifically on the latter for formulating pervious concrete.
The pervious concrete is mainly suitable for paving the ground and the road surface, has multiple functions of draining water, retaining water, ventilating, reducing noise, increasing frictional resistance and the like, is one of basic materials for the construction, operation and maintenance of sponge cities, the pervious concrete is prepared by the recycled aggregate, the carbon emission of the ground and pavement paving material in the whole life cycle is further reduced, meanwhile, the construction waste and the solid waste are effectively utilized, the anti-breaking strength and toughness of the permeable pavement layer formed by paving the existing fiber reinforced recycled aggregate permeable concrete are poor, due to the defects, the production efficiency is greatly reduced, the quality stability of the pervious concrete product cannot be ensured, in addition, the prior working method uses less recycled aggregate, so that in the manufacturing process of the pervious concrete, all of them require the use of a large amount of primary aggregates, and cannot achieve cost saving and environmental load reduction.
Disclosure of Invention
The invention aims to provide fiber-reinforced recycled aggregate pervious concrete, which can solve the problems in the prior art.
The invention is realized by the following technical scheme: the fiber-reinforced recycled aggregate pervious concrete is characterized by being prepared from the following formula: the cement aggregate comprises cement, coarse aggregate, fine aggregate, fiber and water, wherein the coarse aggregate comprises primary aggregate and recycled aggregate.
Further technical scheme is that the water content is 100- 3 1360 and 1950kg/m coarse aggregate 3 The recycled aggregate accounts for 35 to 100 percent, and the fine aggregate accounts for 55 to 265kg/m 3 0-30kg/m of polymer emulsion 3 0-9.6kg/m of water reducing agent 3 The fiber comprises any one of polypropylene fiber, copper-plated steel fiber, glass fiber and lignin fiber, specifically the length of the polypropylene fiber is 10-20mm, and the mixing amount is 0.22-0.83kg/m 3 (ii) a The length of the copper-plated steel fiber is 12mm, and the mixing amount is 2.35-4.13kg/m 3 (ii) a The length of the glass fiber is 12mm, and the volume mixing amount is 0.15-0.22%; the length of the lignin fiber is 10mm, and the mixing amount is 0.9-1.1% of the single dosage of the cement.
The further technical proposal is that the cement is 270- 3 (other auxiliary cementing materials are mixed), and the silica fume is 15-30kg/m 3 50-100kg/m of fly ash 3 High-performance additive 2-5kg/m 3 。
The further technical proposal is that the cement is 355-450kg/m 3 (no other supplementary gelling material is added).
The pervious concrete is prepared by the recycled aggregate, the carbon emission of the ground and pavement paving material in the whole life cycle is further reduced, meanwhile, the construction waste and the solid waste are effectively utilized, the breaking strength and the toughness of the pervious pavement layer are greatly improved by the fiber reinforcement technology, the pervious pavement layer is produced by adopting a premixing mode in a breakthrough manner, the production efficiency is greatly improved, the quality stability of the pervious concrete product is ensured to a greater extent, and compared with the traditional field stirring mode, the pervious concrete is more suitable for large-area, large-volume, large-scale green integral pavement of the ground and the pavement, the production energy consumption is reduced, and the problems of dust pollution, noise pollution, three-waste emission and the like in a construction field are reduced. In addition, the pervious concrete can also play a role in filtering retention, namely filtering and solidifying pollutants (such as insoluble particles, heavy metal ions and the like) in the falling water
In a further technical scheme, the cement is Portland slag cement, the area of the Portland slag cement is 476m2/kg, and the compressive strength of 3d and 28d is 29.7MPa and 47.4MPa respectively.
According to a further technical scheme, the recycled aggregate is obtained by in-situ recycling and processing in a ready-mixed concrete plant, the design strength grade of the recycled concrete is C25-C40, and the coarse aggregate and the fine aggregate are limestone macadam and machine-made sand respectively.
According to a further technical scheme, the nominal particle size range of the recycled aggregate is 10-15mm, and the mass water absorption rate is 3.9%.
In a further technical scheme, the polymer emulsion adopts methyl methacrylate as a monomer, and the density is 0.98 g/cm 3 The solids content was 46%.
According to a further technical scheme, the main component of the water reducing agent is polycarboxylate, and the solid content is 42%.
According to a further technical scheme, tap water from a municipal pipe network is used for mixing and maintaining water.
In a further technical scheme, the fiber reinforced material adopts polypropylene fiber with the length of 8-10mm, the diameter of 0.35mm and the density of 0.90-0.92g/cm 3 。
The further technical proposal is that the cement is 421kg/m 3 118kg/m of water 3 1536kg/m of coarse aggregate 3 Wherein the recycled aggregate accounts for 50 percent, and the fine aggregate accounts for 0kg/m 3 21.1kg/m of polymer emulsion 3 6.3kg/m of polycarboxylic acid water reducing agent 3 0.24kg/m of polypropylene fiber 3 。
The inner surface of the fiber reinforced polymer modified recycled aggregate pervious concrete is easy to form a biological film, microorganisms gathered in the biological film have the function of water purification and can consume eutrophic substances (phosphorus and nitrogen) in water, and the total phosphorus adsorption amount and the total nitrogen adsorption amount of the special pervious concrete are respectively 1.11mg/L and 2.94mg/L through determination.
The further technical proposal is that the cement is P.O 42.5 ordinary portland cement of national standard GB 175 general portland cement.
The further technical proposal is that the cement is 324kg/m 3 126kg/m of water 3 1498kg/m of coarse aggregate 3 Wherein the recycled aggregate accounts for 65 percent, and the fine aggregate accounts for 116kg/m 3 Copper-plated steel fiber 2.35kg/m 3 18kg/m of silica fume 3 36kg/m of fly ash 3 High performance admixture 3.24kg/m 3 。
In a further technical scheme, the high-performance additive is dispersed latex powder.
In a further technical scheme, the length of the adopted copper-plated steel fiber is 7-9 mm.
Under the condition that the ordinary portland cement is selected for standard curing for 28d, the performance indexes of the fiber reinforced recycled aggregate pervious concrete are as follows: the compressive strength is 36.7MPa, the breaking strength is 4.46MPa, the permeability coefficient is 13.4mm/s, and the total carbon emission is 0.113 kg/kg.
CT three-dimensional scanning and microhardness test results show that the bonding strength of slurry and aggregate is improved and the compactness and hydration degree of an interface transition region are improved due to the doping of the fly ash, the silica fume and the dispersed latex powder. The inherent contradiction between the strength and the water permeability coefficient of the pervious concrete is solved to a certain extent.
The fiber reinforced recycled aggregate pervious concrete is manufactured by the following method:
referring to CJJ/T253, the preparation process comprises the steps of firstly, dry-mixing aggregate and cement for 1min (firstly, slowly mixing for 30s and then, quickly mixing for 30 s), then, adding a mixed solution of mixing water, latex powder and a water reducing agent into the dry material, stirring for 2min (firstly, slowly mixing for 1min and then, quickly mixing for 1 min), then discharging, and manufacturing a test piece for testing. The time from the start of stirring to the completion of test piece production is controlled to be 30 min.
The invention has the beneficial effects that:
the invention realizes the centralized plant-mixing production of the pervious concrete, recycles the waste concrete in the production process of a ready-mixed concrete plant, and ensures the novel pervious concrete paving material with balanced mechanical property, long-term property and water permeability for roads by reinforcing the interface transition area of slurry-aggregate by the dispersed fibers.
The recycled aggregate adopted by the invention is mainly prepared from waste concrete of a ready-mixed concrete plant, including waste products generated by material returning and production faults, and waste concrete generated by product inspection and various tests. The waste concrete is intensively processed into recycled aggregate, the recycled aggregate is detected according to the standard of the recycled aggregate, the recycled aggregate meeting the standard requirement is used for producing the pervious concrete, the in-situ recycling of the waste concrete is realized, the cost is saved, the environmental load is reduced, the recycled aggregate is fully soaked in water in advance and wetted, after the recycled aggregate is mixed into the concrete, partial water in the recycled aggregate is slowly released when a cementing material is hydrated, the water consumed by hydration reaction is supplemented, and the internal curing effect is realized.
The recycled water is alkaline water which is generated by the processes of precipitation, filtration, filter pressing and purification of waste water which is inevitably generated in the production process of the ready-mixed concrete. The recycled water is used for stirring the concrete, so that the performance of the concrete is not harmful, and the alkaline components of the recycled water are more beneficial to exciting the hydration reaction of part of the cementing materials.
Pervious concrete is often not high enough in strength due to high porosity, and becomes a 'short slab' for engineering application. On the premise of not influencing the water permeability, the aggregate-slurry interface transition region of the pervious concrete is improved through the dispersive polymer fibers or the inorganic mineral fibers, so that the mechanical property of the pervious concrete is improved, and particularly the breaking strength of the pavement pervious paving material is improved.
The input parameters of the pervious concrete mix proportion design comprise a water-cement ratio, a target porosity, an apparent density and a bulk density of a coarse aggregate, the water-cement ratio is determined depending on the relation between the porosity of the pervious concrete in a fully vibrated compact state and a slurry volume, the volume of cement paste is determined according to the total surface area of the aggregate and the slurry wrapping thickness on the surface of the aggregate which is set in advance, the porosity is kept unchanged, the reduction of the water-cement ratio and the mixing amount of a high-performance water reducing agent is beneficial to improving the strength of the pervious concrete, the strength of the pervious concrete depends on the bonding performance of the aggregate and the slurry, and the porosity of the pervious concrete is controlled by factors such as the nominal particle size, the particle morphology, the surface state and the like of the aggregate.
In order to improve the bonding effect of the slurry of the pervious concrete and the aggregate and improve the performance of an interface transition region, silica fume, fly ash and dispersed latex powder are adopted, the length of the adopted copper-plated steel fiber is 7-9mm, and the volume mixing amount is 2.35kg/m 3 The polycarboxylic acid-based high-performance admixture is used for improving the working performance of the pervious concrete, and can ensure the fluidity required by slurry due to low water-gel ratio.
Drawings
For ease of illustration, the invention is described in detail by the following specific examples and figures.
FIG. 1 is a graph showing the contents of the components of a fiber-reinforced recycled aggregate pervious concrete according to the present invention;
FIG. 2 is a schematic diagram of a permeable concrete sample according to the present invention;
FIG. 3 is a schematic view of recycled aggregate for pervious concrete preparation in accordance with the present invention;
fig. 4 is a schematic view of the actual paving effect of the pervious concrete on the ground in the invention.
Detailed Description
As shown in fig. 1-4, the present invention is described in detail, and for ease of description, the orientations described below are now defined as follows: the up-down, left-right, and front-back directions described below are consistent with the up-down, left-right, front-back directions of the projection relation of fig. 1, and the fiber-reinforced recycled aggregate pervious concrete of the present invention comprises cement, coarse aggregate, fine aggregate, fiber, and water, wherein the coarse aggregate comprises primary aggregate and recycled aggregate.
The related technical indexes of the recycled aggregate meet the technical regulations on recycled concrete application (DG/T J08-2018-2007).
In the invention, the water permeability coefficient of the pervious concrete is measured based on a constant head method, and compared with a falling head method, the constant head method has the advantages that the measurement result is higher, and the influence of the porosity of the concrete is more sensitive.
In addition, based on the analysis of a large amount of test data, the invention also obtains an empirical formula between the 28 d-age compressive strength and flexural strength of the pervious concrete and main mix proportion parameters (porosity, water-cement ratio, cement, aggregate content in different particle size ranges):
f c,28 = 25.5 - 0.55P - 13.3(w/b) + 0.005C
f f ,28 = 6.5 - 0.048P - 2.382(w/b)
wherein,f c,28 、f f,28 respectively the compressive strength and the breaking strength of the 28d age,Pit is expressed in terms of the porosity of the material,w/brepresenting the water-to-gel (ash) ratio,Cthe total amount of the single-component cementing material (cement) is shown.
Advantageously, wherein the water content is 100- 3 1360 and 1950kg/m coarse aggregate 3 The recycled aggregate accounts for 35 to 100 percent, and the fine aggregate accounts for 55 to 265kg/m 3 0-30kg/m of polymer emulsion 3 0-9.6kg/m of water reducing agent 3 。
Advantageously, the fiber comprises any one of polypropylene fiber, copper-plated steel fiber, glass fiber and lignin fiber, specifically the length of the polypropylene fiber is 10-20mm, and the mixing amount is 0.22-0.83kg/m 3 (ii) a The length of the copper-plated steel fiber is 12mm, and the mixing amount is 2.35-4.13kg/m 3 (ii) a The length of the glass fiber is 12mm, and the volume mixing amount is 0.15-0.22%; the length of the lignin fiber is 10mm, and the mixing amount is 0.9-1.1% of the single dosage of the cement.
Advantageously, wherein the cement is 270- 3 (other auxiliary cementing materials are mixed), and the silica fume is 15-30kg/m 3 50-100kg/m of fly ash 3 0-5kg/m of high-performance additive 3 。
Advantageously, wherein cement 355-450kg/m 3 (without other auxiliary gelling materials) 15-30kg/m of silica fume 3 50-100kg/m of fly ash 3 0-5kg/m of high-performance additive 3 。
The range of the main mix proportion design parameters is as follows: the water-gel ratio is 0.24-0.42, the bone-pulp ratio is 1:3.8-1:4.7, and the maximum nominal grain diameter of the coarse aggregate is 5-20 mm.
The main properties of the final pervious concrete are as follows: the actual measurement porosity after hardening is 15-35%, the compressive strength is 10-35MPa, the water permeability coefficient is 2-30mm/s, the single cost price (raw material cost only) is 475- 3 Carbon emission value (CO) of concrete 2 Equivalent discharge index (considering only raw material part) of 0.10-0.15kg/kg (CO generated by pervious concrete per unit mass) 2 Equivalent mass discharged).
Example one
Advantageously, the cement is Portland slag cement with the area of 476m2/kg and the compressive strengths of 3d and 28d of 29.7MPa and 47.4MPa respectively.
Advantageously, the recycled aggregate is obtained by in-situ recycling processing in a ready-mix concrete plant, the recycled concrete has the design strength grade of C25-C40, and the coarse aggregate and the fine aggregate are limestone macadam and machine-made sand respectively.
The recycled aggregate has the nominal particle size range of 10-15mm and the mass water absorption of 3.9%, and other performance indexes of the recycled aggregate meet the relevant regulations of the existing industry standard CJJ/T253 technical Specification for recycled aggregate pervious concrete application.
Advantageously, the polymer emulsion uses methyl methacrylate as monomer and has a density of 0.98 g/cm 3 The solids content was 46%.
Advantageously, the water reducing agent comprises polycarboxylate as the main component, and the solid content is 42%.
Advantageously, the blending and curing water is tap water from a municipal pipeline network.
Advantageously, the fibrous reinforcing material is polypropylene fibres having a length of 8-10mm, a diameter of 0.35mm and a density of 0.90-0.92g/cm 3 。
Advantageously, wherein the cement is 421kg/m 3 118kg/m of water 3 1536kg/m of coarse aggregate 3 Wherein the recycled aggregate accounts for 50 percent, and the fine aggregate accounts for 0kg/m 3 21.1kg/m of polymer emulsion 3 6.3kg/m of polycarboxylic acid water reducing agent 3 0.24kg/m of polypropylene fiber 3 。
The water-cement ratio of the pervious concrete is 0.28, the grout-bone ratio is 45%, and the porosity is 29%.
Under the standard culture of 28d Portland slag cement, the final pervious concrete has the following main properties: the compressive strength is 28.6MPa, the breaking strength is 3.26MPa, the breaking ratio is 8.77, the permeability coefficient is 27.8mm/s, and the total carbon emission is 0.102 kg/kg.
Example two
Advantageously, the cement is P.O 42.5 ordinary portland cement of national standard GB 175 Universal portland cement.
Advantageously, wherein the recycled aggregate has a nominal particle size in the range of 10-15mm and a mass water absorption of 3.9%.
Other performance indexes of the recycled aggregate meet the relevant regulations of the existing industry standard CJJ/T253 technical Specification for recycled aggregate pervious concrete application
Advantageously, wherein the primary aggregate has an apparent density of 2.51g/cm 3 The void ratio was 44.5%, the crush value index was 2.5, and the sludge content was 0.52%.
Advantageously, the cement therein is 324kg/m 3 126kg/m of water 3 1498kg/m of coarse aggregate 3 Wherein the recycled aggregate accounts for 65 percent, and the fine aggregate accounts for 116kg/m 3 Copper-plated steel fiber 2.35kg/m 3 18kg/m of silica fume 3 36kg/m of fly ash 3 High performance admixture 3.24kg/m 3 。
Advantageously, wherein the high performance admixture is a dispersed latex powder.
Advantageously, copper-coated steel fibres are used, among others, having a length of 7-9 mm.
Under the condition that the ordinary portland cement is selected for standard curing for 28d, the performance indexes of the fiber reinforced recycled aggregate pervious concrete are as follows: the compressive strength is 36.7MPa, the breaking strength is 4.46MPa, the permeability coefficient is 13.4mm/s, and the total carbon emission is 0.113 kg/kg.
The fiber reinforced recycled aggregate pervious concrete is manufactured by the following method:
referring to CJJ/T253, the preparation process comprises the steps of firstly, dry-mixing aggregate and cement for 1min (firstly, slowly mixing for 30s and then, quickly mixing for 30 s), then, adding a mixed solution of mixing water, latex powder and a water reducing agent into the dry material, stirring for 2min (firstly, slowly mixing for 1min and then, quickly mixing for 1 min), then discharging, and manufacturing a test piece for testing. The stirring time is controlled to be 30min from the beginning of stirring to the completion of test piece preparation.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (10)
1. The fiber-reinforced recycled aggregate pervious concrete is characterized by being prepared from the following formula: cement 270- 3 355-450kg/m 3 100- 3 1360 and 1950kg/m coarse aggregate 3 The recycled aggregate in the coarse aggregate accounts for 35 to 100 percent, and the polymer emulsion accounts for 0 to 30kg/m 3 0-9.6kg/m of water reducing agent 3 0-5kg/m of high-performance additive 3 The water-glue ratio is 0.24-0.42, the bone-pulp ratio is 1:3.8-1:4.7, and the maximum nominal grain size of the coarse aggregate is 5-20 mm.
2. The fiber reinforced recycled aggregate pervious concrete of claim 1, wherein: also contains glass fiber, 0.15-0.22% of glass fiber.
3. The fiber reinforced recycled aggregate pervious concrete of claim 1, wherein: also contains lignin fiber, 0.9% -1.1% of lignin fiber.
4. The fiber reinforced recycled aggregate of claim 1The water concrete is characterized in that: also contains 15-30kg/m of silica fume 3 。
5. The fiber reinforced recycled aggregate pervious concrete of claim 4, wherein: also contains 50-100kg/m of fly ash 3 。
6. The fiber reinforced recycled aggregate pervious concrete of claim 4, wherein: also contains fine aggregate 55-265kg/m 3 。
7. The fiber reinforced recycled aggregate pervious concrete of claim 6, wherein: 324kg/m cement 3 126kg/m of water 3 1498kg/m of coarse aggregate 3 Wherein the recycled aggregate accounts for 65 percent, and the fine aggregate accounts for 116kg/m 3 0 polymer emulsion, 0 water reducing agent and 18kg/m silica fume 3 High performance admixture 3.24kg/m 3 Copper-plated steel fiber 2.35kg/m 3 36kg/m of fly ash 3 。
8. The fiber reinforced recycled aggregate pervious concrete of claim 1, wherein: cement 421kg/m 3 118kg/m of water 3 1536kg/m of coarse aggregate 3 Wherein the recycled aggregate accounts for 50 percent, and the polymer emulsion accounts for 21.1kg/m 3 6.3kg/m of water reducing agent 3 0.24kg/m of polypropylene fiber 3 0 high-performance additive, 0.28 of water-gel ratio, 45 of bone-slurry ratio and 29 of porosity.
9. The fiber reinforced recycled aggregate pervious concrete of claim 1, wherein: the parent rock of the recycled aggregate is limestone with particle size range of 5-20mm and apparent density of 2.56-2.68g/cm 3 The mass water absorption rate is 5.4-6.2%.
10. A method for preparing the fiber-reinforced recycled aggregate pervious concrete as claimed in any one of claims 1 to 9: firstly, dry-mixing aggregate and cement for 1min (slowly mixing for 30s and then quickly mixing for 30 s);
secondly, adding the mixed liquid of the mixing water, the latex powder and the water reducing agent into the dry materials, and stirring for 2min (firstly slowly stirring for 1min and then quickly stirring for 1 min);
and thirdly, discharging, manufacturing a test piece for testing, and controlling the time from the beginning of stirring to the completion of manufacturing the test piece to be 30 min.
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| CN116444209A (en) * | 2023-04-07 | 2023-07-18 | 三亚瑞泽再生资源利用有限公司 | High polymer environment-friendly recycled concrete and preparation method thereof |
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