CN112250379A - Renewable concrete and production process thereof - Google Patents
Renewable concrete and production process thereof Download PDFInfo
- Publication number
- CN112250379A CN112250379A CN202011002566.XA CN202011002566A CN112250379A CN 112250379 A CN112250379 A CN 112250379A CN 202011002566 A CN202011002566 A CN 202011002566A CN 112250379 A CN112250379 A CN 112250379A
- Authority
- CN
- China
- Prior art keywords
- viscose
- fiber
- parts
- concrete
- fibers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0675—Macromolecular compounds fibrous from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0675—Macromolecular compounds fibrous from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0683—Polyesters, e.g. polylactides
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of concrete manufacturing technology, and particularly discloses a renewable concrete which is mainly prepared from the following raw materials in parts by weight: 1000 portions of recycled aggregate, 500 portions of sand 200, 450 portions of cement 350, 0.2 to 0.8 portion of viscose fiber, 0.1 to 0.5 portion of polyester fiber, 0.1 to 0.3 portion of polyurethane fiber, 5 to 20 portions of water reducing agent and 200 portions of water 150. The production process of the renewable concrete comprises the following steps: step 1, uniformly mixing recycled aggregate, sand, cement and water to prepare slurry; and 2, uniformly mixing the viscose fibers, the polyester fibers, the polyurethane fibers and the water reducing agent with the slurry obtained in the step 1. The renewable concrete has the advantages of high strength, cracking resistance and bending resistance.
Description
Technical Field
The application relates to the field of concrete manufacturing technology, in particular to reproducible concrete and a production process thereof.
Background
With the continuous development of society, the urban construction of China develops rapidly, in the urban construction, concrete is used in a large amount in the construction industry with the advantages of high strength, high durability, low price and the like, but the urban construction also generates a large amount of construction wastes such as waste concrete and the like, the large amount of construction wastes greatly harms the ecological environment, and in addition, the production of concrete also needs to exploit natural resources such as gravels and the like, so that the waste concrete is broken to be used as recycled aggregate, and the realization of the recycling of concrete becomes particularly important.
The recycled aggregate formed by crushing construction wastes such as waste concrete and the like has certain difference in performance with natural aggregate, the recycled aggregate generally has rough surface and more edges and corners, and a large number of fine cracks can appear in the recycled aggregate under the action of larger external force in the production process, so that the water absorption rate and the water absorption rate of the recycled aggregate are higher than those of the natural aggregate, the concrete prepared by using the recycled aggregate has different shrinkage degrees of the concrete due to different water contents between the aggregate and the concrete in the curing process and between the inner layer and the outer layer of the concrete, and further the concrete is cracked, and the defects of low strength, low bending strength and easy cracking are caused.
In view of the above defects, the strength of the renewable concrete is enhanced by adding steel fibers in the prior art, but the concrete is easy to crack due to the smooth surface of the steel fibers, small friction with the renewable aggregate and low binding force with the gel material.
Disclosure of Invention
In order to solve the problem that the renewable concrete is easy to crack, the application aims to provide the renewable concrete and a production process thereof, and the renewable concrete has the advantage of cracking resistance.
In a first aspect, the present application provides a renewable concrete, including:
the renewable concrete is mainly prepared from the following raw materials in parts by weight: 1000 parts of recycled aggregate, 500 parts of sand 200, 450 parts of cement 350, 0.2-0.8 part of viscose fiber, 0.1-0.5 part of polyester fiber, 0.1-0.3 part of polyurethane fiber, 5-10 parts of water reducing agent and 200 parts of water 150; the recycled aggregate is made of construction waste.
By adopting the technical scheme, the viscose fiber, the polyester fiber and the polyurethane fiber are adopted to modify the renewable concrete, the polyester fiber has high strength, a space network structure is formed in the concrete, the renewable aggregate is wrapped in the space network structure, the mutual movement among the renewable aggregate is limited, the strength of the concrete is further enhanced, and the number of cracks in the concrete is reduced; the viscose fibers are dispersed in a network structure formed by the polyester fibers, so that the function of a water absorption conduit can be realized, the cement gel is uniformly diffused into gaps among the recycled aggregates along the viscose fibers, and the generation of cracks of concrete caused by nonuniform distribution of cement gel materials is reduced; the polyurethane fibers are distributed in the cement gel in a network structure formed by the polyester fibers, and when the cement gel is solidified and formed, the polyurethane fibers doped in the cement gel material provide certain elastic force for concrete on two sides of the cement gel material, so that cracks of the concrete caused by stress concentration are reduced; the properties of the three fibers are combined, so that the renewable concrete has the effects of high strength, cracking resistance and bending resistance.
Preferably, the particle size of the recycled aggregate is 5-15 mm.
By adopting the technical scheme, the recycled aggregate with the particle size of 5-15mm has larger effective specific surface area, can be attached with more cement gel, increases the cohesive force of the recycled aggregate and the cement gel material, and has higher strength.
Preferably, the viscose fiber is high wet modulus viscose fiber, the denier is 120-300D, the length is 10-50mm, the dry strength is 3-4Cn/dtex, and the elongation at break is 11-15%.
By adopting the technical scheme, the high wet modulus viscose fiber has high initial modulus and high breaking strength in a wet state, and the fiber number is low, so that a reticular fiber structure can be effectively formed in concrete, and the strength of the reproducible concrete is improved.
Preferably, the high wet modulus viscose fibres have a degree of polymerisation of less than 800.
By adopting the technical scheme, the high wet modulus viscose fiber with the polymerization degree less than 800 has better water absorption, so that the cement gel material can be more easily permeated into the high wet modulus viscose fiber bundle, the cement gel material can be more uniformly diffused, and the concrete uniformity is good.
Preferably, the length of the polyester fiber is 20-80mm, and the dry strength is 4-7 Cn/dtex.
Through the technical scheme, the polyester fibers form a spatial reticular fiber structure in concrete and coat the recycled aggregate, the dry strength of the polyester fibers is preferably 4-7Cn/dtex, on one hand, when the strength of the polyester fibers is lower than 4Cn/dtex, the movement of the recycled aggregate cannot be well limited due to insufficient strength of the fibrous reticular structure, and on the other hand, when the dry strength of the polyester fibers is higher than 7Cn/dtex, the fiber reticular structure is increased in brittleness and is broken under small stretching; according to the particle size of the recycled aggregate, the space network structure formed by the polyester fiber with the length of 20-80mm can completely coat the recycled aggregate, and the structural strength of the recycled concrete is improved.
Preferably, the polyurethane fiber has a length of 20-50mm, a denier of 20-50D, and an elongation at break of 400-600%.
By adopting the technical scheme, the denier number of the polyurethane fiber is preferably 20-50D, on one hand, the polyurethane fiber has low strength when the denier number is less than 20D and is easy to break when being stretched, and on the other hand, when the denier number is more than 50D, the polyurethane fiber is too thick, has insufficient binding force with concrete and is easy to separate from the concrete when being stretched, so that the crack can not be reduced; the polyurethane fiber with the thickness of 20-50mm can be well crosslinked with the space net structure, so that the tensile and bending resistance of the space net structure is improved; the polyurethane fiber has higher elastic recovery capability, after the hydration reaction of the reproducible concrete is finished, the reproducible concrete can shrink, the polyurethane fiber bonded in the reproducible concrete is stretched by the force inside the concrete, the tendency of concrete shrinkage is slowed down through the deformation of the polyurethane fiber, cracks generated when the reproducible concrete shrinks are reduced, and the anti-cracking capability of the reproducible concrete is improved.
In a second aspect, the application provides a production process of a renewable concrete, which adopts the following technical scheme:
the production process of the renewable concrete comprises the following steps:
step 1: uniformly mixing the recycled aggregate, sand, cement and water to prepare slurry;
step 2: and (3) uniformly mixing the viscose fibers, the polyester fibers, the polyurethane fibers and the water reducing agent with the slurry obtained in the step (1).
By adopting the technical scheme, the recycled aggregate, the sand, the cement and the water are premixed, so that the cement slurry can coat the recycled aggregate better, the viscose fiber, the polyester fiber and the polyurethane fiber are added into the cement slurry and then mixed, a space net structure can be formed while the viscose fiber, the polyester fiber and the polyurethane fiber are dispersed in the slurry, and the formed space net structure is more uniform.
Preferably, in step 1, the viscose fibers are washed and desized by deionized water.
By adopting the technical scheme, after the sizing agent on the surface of the viscose fiber is separated, the friction coefficient of the viscose fiber is increased, and the binding force with the renewable concrete is increased.
Preferably, in the step 1, the viscose fiber is degraded by electron beam irradiation, the irradiation time is 10min, and the irradiation dose is 40 kGy.
By adopting the technical scheme, after the viscose fiber is degraded by electron beam irradiation, the crystallinity of the viscose fiber is reduced, the water absorption of the viscose fiber is improved, the cement gel material can be better diffused along the viscose fiber, and the cement gel material is more uniform in dispersion.
Preferably, in step 1, the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.2-1%.
By adopting the technical scheme, after the polyurethane fiber is soaked in the sodium hydroxide solution, the oil agent and impurities on the surface of the polyurethane fiber are cleaned, the friction coefficient of the surface of the fiber is increased, the friction force between the fiber and the recycled aggregate is increased, and the structural strength of the recycled concrete is further improved.
In summary, the present application has the following beneficial effects:
firstly, viscose fiber, polyester fiber and polyurethane fiber are mixed with the renewable concrete, the performance characteristics of the three fibers are combined, a fiber mesh structure is formed in the renewable concrete, and the structural strength of the renewable concrete is improved.
Secondly, the viscose fiber of the application preferably adopts high wet modulus viscose fiber, and because the high wet modulus viscose fiber has good water absorption, cement colloid can permeate into fiber bundles of the high wet modulus viscose fiber, so that the bonding degree is high, and the structural strength of the renewable cement is further improved.
Third, this application is through adding polyurethane fiber, and polyurethane fiber has higher elastic recovery rate, has improved fiber network structure's deformability, and the concrete that can regenerate contracts or receives the exogenic action and provide the elastic recovery ability, makes the concrete that can regenerate have the effect of anti buckling, anti fracture.
Detailed Description
The present application will be described in further detail with reference to examples.
The recycled aggregate is prepared by crushing and screening construction waste, the construction waste generally comprises at least one of waste concrete, bricks and stones, preferably, the recycled aggregate is prepared by crushing and screening the waste concrete and the stones, the particle size of the recycled aggregate is 5-15mm, and the recycled aggregate is preferably 10 mm; the sand is one of river sand, mountain sand and lake sand, preferably, the sand is river sand, the fineness modulus is 3.0-2.3, and the average particle size is 0.5-0.35 mm; in the application, the cement is Portland cement, and the reference number is 42.5; the water reducing agent is one of a lignin water reducing agent, a naphthalene water reducing agent and a polycarboxylic acid water reducing agent, preferably, the polycarboxylic acid water reducing agent is adopted in the application, and the FDN-1 polycarboxylic acid high-efficiency water reducing agent produced by Zhengzhou Aksi building materials Co., Ltd is adopted in the application;
the viscose fiber is subjected to deionized water desizing treatment, wherein the deionized water desizing treatment is to soak the viscose fiber in deionized water at the temperature of 40-60 ℃ for 10-30 minutes and then dry the viscose fiber at the temperature of 60-100 ℃.
The viscose fiber is degraded by electron beam irradiation, the irradiation time is 10 minutes, and the irradiation dose is 40 kGy.
Preferably, the viscose fiber is subjected to de-sizing treatment by using deionized water, and then is subjected to de-sizing treatment by using deionized water.
Examples
Example 1
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 500 parts of recycled aggregate, 500 parts of sand, 350 parts of cement, 0.2 part of viscose, 0.15 part of polyester fiber, 0.1 part of polyurethane fiber, 5 parts of water reducing agent and 150 parts of water; the viscose fibers are high-wet-modulus viscose fibers, the denier of the high-wet-modulus viscose fibers is 120D, the length of the high-wet-modulus viscose fibers is 10mm, the dry strength of the high-wet-modulus viscose fibers is 3Cn/dtex, the elongation at break of the high-wet-modulus viscose fibers is 11%, the polymerization degree of the high-wet-modulus viscose fibers is 500, the length of the polyester fibers is 20mm, and the dry strength of the polyester fibers is 4 Cn; the length of the polyurethane fiber is 20mm, the denier is 20D, the elongation at break is 400%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.2% for 10min, cleaned and desized.
The production process of the renewable concrete of the embodiment comprises the following steps:
step 1: carrying out electron beam irradiation degradation on the viscose fibers, wherein the irradiation time is 10 minutes, and the irradiation dose is 40 kGy;
step 2: soaking the viscose in the removed water at the temperature of 40 ℃ for 10 minutes, and then drying the viscose at the temperature of 80 ℃;
and step 3: mixing and stirring the recycled aggregate, the natural aggregate, the cement and the water for 3 minutes to prepare slurry;
and 4, step 4: and (3) mixing and stirring 0.2 part of viscose, 0.1 part of polyester fiber, 0.1 part of polyurethane fiber and 5 parts of water reducing agent with the slurry obtained in the step (1) for 5 min.
Example 2
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 700 parts of recycled aggregate, 300 parts of sand, 400 parts of cement, 0.5 part of viscose, 0.3 part of polyester fiber, 0.15 part of polyurethane fiber, 10 parts of water reducing agent and 180 parts of water; the viscose fibers are high-wet-modulus viscose fibers, the denier of the high-wet-modulus viscose fibers is 180D, the length of the high-wet-modulus viscose fibers is 20mm, the dry strength of the high-wet-modulus viscose fibers is 3.5Cn/dtex, the elongation at break of the high-wet-modulus viscose fibers is 13%, the polymerization degree of the high-wet-modulus viscose fibers is 550, the length of the polyester fibers is 40mm, and the dry strength of the polyester fibers is 5 Cn; the length of the polyurethane fiber is 35mm, the denier is 30D, the breaking elongation is 450%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.35% for 10min to be cleaned and desized.
The production process of the renewable concrete of the embodiment comprises the following steps:
step 1: carrying out electron beam irradiation degradation on the viscose fibers, wherein the irradiation time is 10 minutes, and the irradiation dose is 40 kGy;
step 2: soaking the viscose in the removed water at the temperature of 40 ℃ for 10 minutes, and then drying the viscose at the temperature of 80 ℃;
and step 3: mixing and stirring the recycled aggregate, the natural aggregate, the cement and the water in a stirrer for 3 minutes to prepare slurry;
and 4, step 4: and (3) mixing and stirring 0.2 part of viscose, 0.1 part of polyester fiber, 0.1 part of polyurethane fiber and 10 parts of water reducing agent with the slurry obtained in the step (1) for 5 minutes.
Example 3
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 900 parts of recycled aggregate, 500 parts of sand, 450 parts of cement, 0.6 part of viscose, 0.5 part of polyester fiber, 0.2 part of polyurethane fiber, 8 parts of water reducing agent and 200 parts of water; the viscose fibers are high-wet-modulus viscose fibers, the denier of the high-wet-modulus viscose fibers is 180D, the length of the high-wet-modulus viscose fibers is 40mm, the dry strength of the high-wet-modulus viscose fibers is 3.8Cn/dtex, the elongation at break of the high-wet-modulus viscose fibers is 14%, the polymerization degree of the high-wet-modulus viscose fibers is 600, the length of the polyester fibers is 50mm, and the dry strength of the polyester fibers is 5.5 Cn; the length of the polyurethane fiber is 40mm, the denier is 35D, the elongation at break is 500%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.5% for 10min, cleaned and desized.
The production process of the renewable concrete of the embodiment comprises the following steps:
step 1: carrying out electron beam irradiation degradation on the viscose fibers, wherein the irradiation time is 10 minutes, and the irradiation dose is 40 kGy;
step 2: soaking the viscose in the removed water at the temperature of 40 ℃ for 10 minutes, and then drying the viscose at the temperature of 80 ℃;
and step 3: mixing and stirring the recycled aggregate, the natural aggregate, the cement and the water for 3 minutes to prepare slurry;
and 4, step 4: and (3) mixing and stirring 0.2 part of viscose, 0.1 part of polyester fiber, 0.1 part of polyurethane fiber and 8 parts of water reducing agent with the slurry obtained in the step (1) for 5 minutes.
Example 4
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.7 part of viscose, 0.4 part of polyester fiber, 0.25 part of polyurethane fiber, 7 parts of water reducing agent and 180 parts of water; the viscose fibers are high-wet-modulus viscose fibers, the denier of the high-wet-modulus viscose fibers is 240D, the length of the high-wet-modulus viscose fibers is 45mm, the dry strength of the high-wet-modulus viscose fibers is 3.5Cn/dtex, the elongation at break of the high-wet-modulus viscose fibers is 15%, the polymerization degree of the high-wet-modulus viscose fibers is 650, the length of the polyester fibers is 60mm, and the dry strength of the polyester fibers is 6 Cn/; the length of the polyurethane fiber is 45mm, the denier is 40D, the elongation at break is 550%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.6% for 10min, cleaned and desized.
The production process of this example is the same as example 1.
Example 5
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.8 part of viscose, 0.5 part of polyester fiber, 0.3 part of polyurethane fiber, 7 parts of water reducing agent and 180 parts of water; the viscose fibers are high-wet-modulus viscose fibers, the denier of the high-wet-modulus viscose fibers is 300D, the length of the high-wet-modulus viscose fibers is 50mm, the dry strength of the high-wet-modulus viscose fibers is 4Cn/dtex, the elongation at break of the high-wet-modulus viscose fibers is 15%, the polymerization degree of the high-wet-modulus viscose fibers is 650, the length of the polyester fibers is 65mm, and the dry strength of the polyester fibers is 6.5 Cn/; the length of the polyurethane fiber is 50mm, the denier is 45D, the elongation at break is 600%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.7% for 10min, cleaned and desized.
The production process of this example is the same as example 1.
Example 6
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.8 part of viscose, 0.5 part of polyester fiber, 0.2 part of polyurethane fiber, 7 parts of water reducing agent and 200 parts of water, wherein the viscose is high-wet-modulus viscose, the denier of the high-wet-modulus viscose is 300D, the length of the viscose is 50mm, the dry strength of the viscose is 4Cn/dtex, the elongation at break of the viscose is 15%, the degree of polymerization of the viscose is 700, the length of the polyester fiber is 70mm, and the dry strength of the polyester fiber is 7 Cn/dtex; the length of the polyurethane fiber is 50mm, the denier is 50D, the elongation at break is 600%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.8% for 10min, cleaned and desized.
The production process of this example is the same as example 1.
Example 7
The renewable concrete in the embodiment is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.2 part of viscose, 0.5 part of polyester fiber, 0.2 part of polyurethane fiber, 7 parts of water reducing agent and 200 parts of water; the viscose fiber is a high-wet-modulus viscose fiber, the denier of the high-wet-modulus viscose fiber is 300D, the length of the high-wet-modulus viscose fiber is 50mm, the dry strength of the high-wet-modulus viscose fiber is 4Cn/dtex, the elongation at break of the high-wet-modulus viscose fiber is 15%, the polymerization degree of the high-wet-modulus viscose fiber is 750, the length of the polyester fiber is 80mm, the dry strength of the high-wet-modulus viscose fiber is 7Cn/dtex, the length of the polyurethane fiber is 50mm, the denier of the high-wet-modulus viscose fiber is 50D, the elongation at break of the high-wet-.
The production process of this example is the same as example 1.
Example 8
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 600 parts of recycled aggregate, 300 parts of sand, 450 parts of cement, 0.8 part of viscose, 0.5 part of polyester fiber, 0.1 part of polyurethane fiber, 7 parts of water reducing agent and 200 parts of water; wherein the viscose fiber is high wet modulus viscose fiber, the denier of the high wet modulus viscose fiber is 200D, the length is 35mm, the dry strength is 3.5Cn/dtex, the elongation at break is 13.5%, the degree of polymerization is 800, the length of the polyester fiber is 55mm, and the dry strength is 5.5 Cn/dtex; the length of the polyurethane fiber is 35mm, the denier is 35D, the elongation at break is 500%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.9% for 10min, cleaned and desized.
The production process of this example is the same as example 1.
Example 9
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.5 part of viscose, 0.3 part of polyester fiber, 0.1 part of polyurethane fiber, 7 parts of water reducing agent and 180 parts of water; wherein the viscose fiber is high wet modulus viscose fiber, the denier of the high wet modulus viscose fiber is 200D, the length is 35mm, the dry strength is 3.5Cn/dtex, the elongation at break is 13.5%, the degree of polymerization is 800, the length of the polyester fiber is 55mm, and the dry strength is 5.5 Cn/dtex; the length of the polyurethane fiber is 35mm, the denier is 35D, the elongation at break is 500%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.95% for 10min, cleaned and desized.
The production process of this example is the same as example 1.
Example 10
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 200 parts of sand, 400 parts of cement, 0.6 part of viscose, 0.4 part of polyester fiber, 0.2 part of polyurethane fiber, 7 parts of water reducing agent and 180 parts of water; the viscose fibers are high-wet-modulus viscose fibers, the denier of the high-wet-modulus viscose fibers is 150D, the length of the high-wet-modulus viscose fibers is 40mm, the dry strength of the high-wet-modulus viscose fibers is 3Cn/dtex, the elongation at break of the high-wet-modulus viscose fibers is 12%, the polymerization degree of the high-wet-modulus viscose fibers is 500, the length of the polyester fibers is 60mm, and the dry strength of the polyester fibers is 6 Cn/; the length of the polyurethane fiber is 40mm, the denier is 40D, the elongation at break is 550%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 1% for 10min, cleaned and desized.
The production process of this example is the same as example 1.
Example 11
The renewable concrete of the embodiment is prepared from the following raw materials in parts by weight: 900 parts of recycled aggregate, 450 parts of sand, 450 parts of cement, 0.3 part of viscose, 0.2 part of polyester fiber, 0.15 part of polyurethane fiber, 7 parts of water reducing agent and 200 parts of water; wherein the viscose fiber is high wet modulus viscose fiber, the denier of the high wet modulus viscose fiber is 200D, the length is 35mm, the dry strength is 3.5Cn/dtex, the elongation at break is 13.5%, the degree of polymerization is 650, the length of the polyester fiber is 35mm, and the dry strength is 5.5 Cn/dtex; the length of the polyurethane fiber is 40mm, the denier is 35D, the breaking elongation is 450%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.7% for 10min to be cleaned and desized.
The production process of this example is the same as example 1.
Comparative example
Comparative example 1
The renewable concrete of the comparative example is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 450 parts of cement, 7 parts of water reducing agent and 200 parts of water.
The production process of the renewable concrete of the comparative example comprises the following steps:
step 1: mixing and stirring the recycled aggregate, the natural aggregate, the cement and the water in a stirrer for 3 minutes to prepare slurry;
step 2: and (3) mixing and stirring 20 parts of water reducing agent and the slurry in the step (1) for 5 minutes.
Comparative example 2
The renewable concrete of the comparative example is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.8 part of viscose, 20 parts of a water reducing agent and 180 parts of water, wherein the viscose is high wet modulus viscose, the denier of the high wet modulus viscose is 300D, the length of the high wet modulus viscose is 50mm, the dry strength of the high wet modulus viscose is 4Cn/dtex, the elongation at break of the high wet modulus is 15%, and the degree of polymerization of the high wet modulus viscose is 800.
The production process of the renewable concrete of the comparative example comprises the following steps:
step 1: carrying out electron beam irradiation degradation on the viscose fibers, wherein the irradiation time is 10 minutes, and the irradiation dose is 40 kGy;
step 2: soaking the viscose in the removed water at the temperature of 40 ℃ for 10 minutes, and then drying the viscose at the temperature of 80 ℃;
and step 3: mixing the recycled aggregate, the natural aggregate, the cement and the water in a stirrer, and stirring for 3 minutes to prepare slurry;
and 4, step 4: and (3) mixing and stirring 0.8 part of viscose fiber and 7 parts of water reducing agent with the slurry in the step (1) for 5 minutes.
Comparative example 3
The renewable concrete of the comparative example is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.8 part of viscose, 0.5 part of polyester fiber, 7 parts of water reducing agent and 180 parts of water, wherein the viscose is high-wet-modulus viscose, the denier of the high-wet-modulus viscose is 300D, the length is 50mm, the dry strength is 4Cn/dtex, the elongation at break is 15%, the degree of polymerization is 500, the length of the polyester fiber is 80mm, and the dry strength is 7 Cn/dtex.
The production process of the renewable concrete of the comparative example comprises the following steps:
step 1: carrying out electron beam irradiation degradation on the viscose fibers, wherein the irradiation time is 10 minutes, and the irradiation dose is 40 kGy;
step 2: soaking the viscose in the removed water at the temperature of 40 ℃ for 10 minutes, and then drying the viscose at the temperature of 80 ℃;
and step 3: mixing and stirring the recycled aggregate, the natural aggregate, the cement and the water in a stirrer for 3 minutes to prepare slurry;
and 4, step 4: and (3) mixing and stirring 0.8 part of viscose, 0.5 part of polyester fiber, 0.5 part of polyurethane fiber and 7 parts of water reducing agent with the slurry obtained in the step (1) for 5 minutes.
Comparative example 4
The renewable concrete of the comparative example is prepared from the following raw materials in parts by weight: 1300 parts of recycled aggregate, 50 parts of natural aggregate, 400 parts of cement, 0.8 part of viscose, 0.3 part of polyurethane fiber, 7 parts of water reducing agent and 120 parts of water, wherein the viscose is high-wet-modulus viscose, the denier of the high-wet-modulus viscose is 300D, the length is 50mm, the dry strength is 4Cn/dtex, and the elongation at break is 15%; the length of the polyurethane fiber is 50mm, the denier is 50D, the elongation at break is 600%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 1% for 10min, cleaned and desized.
The production process of the renewable concrete of the comparative example comprises the following steps:
step 1: mixing and stirring the recycled aggregate, the natural aggregate, the cement and the water in a stirrer for 3 minutes to prepare slurry;
step 2: and (3) mixing and stirring 0.8 part of viscose, 0.3 part of polyurethane fiber and 7 parts of water reducing agent with the slurry obtained in the step (1) for 5 minutes.
Comparative example 5
The renewable concrete of the comparative example is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.5 part of polyester fiber, 0.3 part of polyurethane fiber, 7 parts of water reducing agent and 180 parts of water, wherein the length of the polyester fiber is 80mm, and the dry strength is 7 Cn/dtex; the length of the polyurethane fiber is 50mm, the denier is 50D, the elongation at break is 600%, and the polyurethane fiber is soaked in a sodium hydroxide solution with the mass fraction of 0.2% for 10min, cleaned and desized.
The production process of the renewable concrete of the comparative example comprises the following steps:
step 1: mixing and stirring the recycled aggregate, the natural aggregate, the cement and the water in a stirrer for 3 minutes to prepare slurry;
step 2: and (3) mixing and stirring 0.5 part of polyester fiber, 0.3 part of polyurethane fiber and 7 parts of water reducing agent with the slurry obtained in the step (1) for 5 minutes.
Comparative example 6
The renewable concrete of the comparative example is prepared from the following raw materials in parts by weight: 800 parts of recycled aggregate, 400 parts of sand, 400 parts of cement, 0.8 part of viscose, 7 parts of a water reducing agent and 180 parts of water, wherein the viscose is high wet modulus viscose, the denier of the high wet modulus viscose is 300D, the length of the high wet modulus viscose is 50mm, the dry strength of the high wet modulus viscose is 4Cn/dtex, the elongation at break of the high wet modulus is 15%, and the degree of polymerization of the high wet modulus viscose is 800.
The production process of the renewable concrete of the comparative example comprises the following steps:
step 1: mixing the recycled aggregate, the natural aggregate, the cement and the water in a stirrer, and stirring for 3 minutes to prepare slurry;
step 2: and (3) mixing and stirring 0.8 part of viscose fiber and 7 parts of water reducing agent with the slurry in the step (1) for 5 minutes.
Performance test
Cubic test pieces with the side length of 150mm are prepared by the materials and the production process according to the examples and the comparative examples, and after curing for 28 days at the ambient temperature of 20 +/-5 ℃, the compressive strength, the flexural strength and the bending strength of the concrete are tested according to the common concrete mechanical property test standard (GB/T50081-2002), and the test results are shown in Table 1.
Table 1 renewable concrete performance test data for examples 1-11 and comparative examples 1-6.
| Serial number | Compressive strength/MPa | Flexural strength/MPa | Tensile strength/MPa |
| Comparative example 1 | 37.5 | 3.73 | 3.87 |
| Comparative example 2 | 38.1 | 3.85 | 3.90 |
| Comparative example 3 | 40.5 | 4.01 | 3.93 |
| Comparative example 4 | 41.7 | 4.15 | 4.26 |
| Comparative example 5 | 40.5 | 4.07 | 4.16 |
| Comparative example 6 | 37.8 | 3.96 | 4.02 |
| Example 1 | 39.0 | 3.92 | 4.05 |
| Example 2 | 39.3 | 3.98 | 4.11 |
| Example 3 | 39.7 | 4.02 | 4.18 |
| Example 4 | 40.5 | 4.09 | 4.25 |
| Example 5 | 40.9 | 4.14 | 4.32 |
| Example 6 | 41.6 | 4.19 | 4.35 |
| Example 7 | 39.4 | 3.99 | 4.03 |
| Example 8 | 42.0 | 4.13 | 4.24 |
| Example 9 | 41.1 | 4.07 | 4.23 |
| Example 10 | 42.1 | 4.12 | 4.27 |
| Example 11 | 41.7 | 4.16 | 4.30 |
As can be seen from comparative example 1, comparative example 2, comparative example 3 and comparative example 4 in combination with table 1, the compressive strength of the renewable concrete can be improved by the high-wet-modulus viscose fiber, and as can be seen from comparative example 2 and comparative example 6 in combination with table 1, the breaking strength and tensile strength of the renewable concrete added with the high-wet-modulus viscose fiber after electron beam irradiation are reduced, because the degree of polymerization of the high-wet-modulus viscose fiber after degradation by electron beam irradiation is reduced, the tensile strength is reduced; comparing example 6 and example 7 with Table 1, it can be seen that the combination of properties of example 6 is greatly improved over example 7, indicating that the conduit action of the high wet modulus fibers provides a more uniform dispersion of the cement gel in the spatial network of polyester fibers.
Comparing example 1 and example 7 in combination with table 1, it can be seen that polyester fibers improve the strength of the recycled concrete to a greater extent than high wet modulus fibers; the reinforcement effect of the polyester fibers improves the strength of the fiber mesh structure, and the improvement of the compressive strength of the concrete is more remarkable.
Comparing comparative example 1 and comparative example 5 in combination with table 1, it can be seen that the recycled concrete containing polyurethane fibers has higher flexural strength and tensile strength than the recycled concrete without the addition of polyurethane fibers.
As can be seen by comparing example 5, example 6 and example 8 with Table 1, the flexural strength and tensile strength were reduced when the amount of the polyurethane fiber was too much, and the amount of the polyurethane fiber added was preferably 0.2 part.
In summary, the high wet modulus viscose fiber, the polyester fiber and the polyurethane fiber form a space network structure in the renewable concrete, and the high wet modulus viscose fiber has strong adsorbability to concrete colloid, so that the concrete colloid can permeate into the high wet modulus viscose fiber bundle, the cohesive force among the concrete, the renewable aggregate and the fiber is increased, meanwhile, the strength of the renewable concrete is further improved due to the criss-cross reinforcement and bridging effect, and in addition, the high elastic recovery rate of the polyurethane fiber greatly improves the tensile strength of the fiber network structure, so that the bending resistance and the tensile strength of the renewable concrete are improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The renewable concrete is characterized by being mainly prepared from the following raw materials in parts by weight: 1000 parts of recycled aggregate, 500 parts of sand 200, 450 parts of cement 350, 0.2-0.8 part of viscose fiber, 0.1-0.5 part of polyester fiber, 0.1-0.3 part of polyurethane fiber, 5-10 parts of water reducing agent and 200 parts of water 150; the recycled aggregate is made of construction waste.
2. The renewable concrete according to claim 1, wherein the recycled aggregate has a particle size of 5-15 mm.
3. The recycled concrete of claim 1, wherein the viscose is a high wet modulus viscose having a denier of 120-300D, a length of 10-50mm, a dry strength of 3-4Cn/dtex, and an elongation at break of 11-15%.
4. The recycled concrete of claim 3, wherein the degree of polymerization of the high wet modulus viscose fiber is less than 800.
5. The recycled concrete of claim 1, wherein the polyester fibers have a length of 20-80mm and a dry strength of 4-7 Cn/dtex.
6. The recycled concrete of claim 1, wherein the polyurethane fiber has a length of 20 to 50mm, a denier of 20 to 50D, and an elongation at break of 400% to 600%.
7. A process for the production of recycled concrete according to any one of claims 1 to 6, comprising the following steps:
step 1: uniformly mixing the recycled aggregate, sand, cement and water to prepare slurry;
step 2: and (3) uniformly mixing the viscose fibers, the polyester fibers, the polyurethane fibers and the water reducing agent with the slurry obtained in the step (1).
8. The process for producing recycled concrete according to claim 7, wherein in step 1, the viscose fibers are subjected to washing and desizing treatment by deionized water.
9. The process for producing recycled concrete according to claim 8, wherein in step 1, the viscose fiber is degraded by electron beam irradiation, the irradiation time is 10min, and the irradiation dose is 40 kGy.
10. The process for producing recycled concrete according to claim 7, wherein in the step 1, the polyurethane fiber is soaked in 0.2-1% by mass of sodium hydroxide solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002566.XA CN112250379B (en) | 2020-09-22 | 2020-09-22 | Renewable concrete and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002566.XA CN112250379B (en) | 2020-09-22 | 2020-09-22 | Renewable concrete and production process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112250379A true CN112250379A (en) | 2021-01-22 |
| CN112250379B CN112250379B (en) | 2022-08-05 |
Family
ID=74232906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011002566.XA Active CN112250379B (en) | 2020-09-22 | 2020-09-22 | Renewable concrete and production process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112250379B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115231871A (en) * | 2022-06-21 | 2022-10-25 | 宝鸡市东大洋混凝土有限公司 | Recycled aggregate concrete and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090036952A (en) * | 2007-10-10 | 2009-04-15 | 한국건설기술연구원 | Concrete composition for tunnel lining |
| CN102167550A (en) * | 2011-01-17 | 2011-08-31 | 交通运输部公路科学研究院 | Early-strength fast-track concrete for repairing cement-concrete road surface |
| CN103979899A (en) * | 2014-06-05 | 2014-08-13 | 武汉理工大学 | Preparation method of hybrid fiber reinforced concrete |
| CN107500623A (en) * | 2017-08-17 | 2017-12-22 | 暨南大学 | A kind of high-strength concrete of low water binder ratio high doping quantity of fly ash |
| CN109250962A (en) * | 2018-09-18 | 2019-01-22 | 罗永山 | A kind of preparation method of modified mixing Basalt fiber concrete |
| CN110357500A (en) * | 2019-06-25 | 2019-10-22 | 厦门三航混凝土有限公司 | A kind of pervious concrete |
| CN111574142A (en) * | 2020-04-07 | 2020-08-25 | 南京鹿晶混凝土有限公司 | Renewable concrete formula and preparation method thereof |
-
2020
- 2020-09-22 CN CN202011002566.XA patent/CN112250379B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090036952A (en) * | 2007-10-10 | 2009-04-15 | 한국건설기술연구원 | Concrete composition for tunnel lining |
| CN102167550A (en) * | 2011-01-17 | 2011-08-31 | 交通运输部公路科学研究院 | Early-strength fast-track concrete for repairing cement-concrete road surface |
| CN103979899A (en) * | 2014-06-05 | 2014-08-13 | 武汉理工大学 | Preparation method of hybrid fiber reinforced concrete |
| CN107500623A (en) * | 2017-08-17 | 2017-12-22 | 暨南大学 | A kind of high-strength concrete of low water binder ratio high doping quantity of fly ash |
| CN109250962A (en) * | 2018-09-18 | 2019-01-22 | 罗永山 | A kind of preparation method of modified mixing Basalt fiber concrete |
| CN110357500A (en) * | 2019-06-25 | 2019-10-22 | 厦门三航混凝土有限公司 | A kind of pervious concrete |
| CN111574142A (en) * | 2020-04-07 | 2020-08-25 | 南京鹿晶混凝土有限公司 | Renewable concrete formula and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115231871A (en) * | 2022-06-21 | 2022-10-25 | 宝鸡市东大洋混凝土有限公司 | Recycled aggregate concrete and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112250379B (en) | 2022-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Onuaguluchi et al. | Plant-based natural fibre reinforced cement composites: A review | |
| Yan et al. | A review of recent research on the use of cellulosic fibres, their fibre fabric reinforced cementitious, geo-polymer and polymer composites in civil engineering | |
| Rostami et al. | A review on performance of polyester fibers in alkaline and cementitious composites environments | |
| Mishra et al. | A review on pineapple leaf fibers, sisal fibers and their biocomposites | |
| Zhang et al. | Mechanical properties of jute fiber‐reinforced high‐strength concrete | |
| Shang et al. | Efficacy of modified rice straw fibre on properties of cementitious composites | |
| CN114656206B (en) | Nano-silica and basalt fiber synergistically enhanced recycled concrete and preparation method thereof | |
| Sen et al. | Pretreatment of woven jute FRP composite and its use in strengthening of reinforced concrete beams in flexure | |
| Liu et al. | Research progress on durability of cellulose fiber-reinforced cement-based composites | |
| CN111892346A (en) | Environment-friendly modified straw fiber regenerated fine aggregate cement-based composite material and preparation method thereof | |
| Balea et al. | Fiber reinforced cement based composites | |
| CN112250379B (en) | Renewable concrete and production process thereof | |
| Hassan Nensok et al. | Optimization of mechanical properties of cellular lightweight concrete with alkali treated banana fiber | |
| Correia et al. | Utilization of vegetable fibers for production of reinforced cementitious materials | |
| CZ385796A3 (en) | Cement mixture mdf (without macroscopic defects) with enhanced impact strength | |
| Azzmi et al. | Kenaf Fibrous Concrete: Mechanical properties with different fiber volume fraction | |
| Menezes et al. | Analysis of the physical-mechanical behavior of clayey sand soil improved with coir fiber | |
| Liu et al. | Study on wood chips modification and its application in wood-cement composites | |
| Ramalingam et al. | Effect of natural fish tail palm fiber on the workability and mechanical properties of fiber reinforced concrete | |
| Pederneiras et al. | Effects of the incorporation of waste fibres on the cracking resistance of mortars: A review | |
| Rokbi et al. | Flexural characterization of polymer concrete comprising waste marble and date palm fibers | |
| Umair et al. | Green fiber-reinforced concrete composites | |
| Fonseca et al. | Influence of Different Types of Treatments on Amazonian Vegetable Fibers on the Performance of Mortars Based on Portland Cement, Metakaolin and Fly Ash | |
| CN112250370B (en) | Lightweight concrete and production process thereof | |
| CN114276075A (en) | Multi-scale fiber composite reinforced gangue ceramsite concrete and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |