CN112979227A - Waste steel slag and waste rubber fine aggregate concrete product and preparation method thereof - Google Patents

Waste steel slag and waste rubber fine aggregate concrete product and preparation method thereof Download PDF

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Publication number
CN112979227A
CN112979227A CN202110270501.1A CN202110270501A CN112979227A CN 112979227 A CN112979227 A CN 112979227A CN 202110270501 A CN202110270501 A CN 202110270501A CN 112979227 A CN112979227 A CN 112979227A
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waste
steel slag
parts
fine aggregate
concrete product
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李茂森
罗仁
刘怀
覃铃玲
李婉淋
刘浩然
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China University of Geosciences
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China University of Geosciences
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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
    • 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)
  • Road Paving Structures (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a waste steel slag and waste rubber fine aggregate concrete product which comprises, by weight, 15-25 parts of cement, 10-22.5 parts of machine-made sand, 45-55 parts of gravel, 2.25-10 parts of steel slag, 2-8 parts of modified rubber particles, 5-15 parts of water and 0.02-0.05 part of a water reducing agent; the invention also discloses a preparation method of the waste steel slag and waste rubber fine aggregate concrete product. The invention ensures the strength and stability of concrete, greatly reduces the burden of industrial solid waste discharge on the environment, saves the cost, realizes the functionalization, the greening and the high-value of the product while largely consuming the waste steel slag and rubber particles, and has good economic benefit and social benefit.

Description

Waste steel slag and waste rubber fine aggregate concrete product and preparation method thereof
Technical Field
The invention relates to the technical field of new municipal materials. More particularly, the invention relates to a waste steel slag and waste rubber fine aggregate concrete product and a preparation method thereof.
Background
In recent years, with the continuous development of national economy of China, large-scale traffic infrastructure construction is faced, the consumption of concrete materials is extremely large, sand mining prohibitions are issued to Yangtze river and Han river in Wuhan city to protect ecological environment at present, natural river sand resources for preparing concrete are very deficient, and meanwhile, other areas of China are also faced with the problem that river sand resources are very deficient. Therefore, solving the problem of lack of natural river sand in concrete preparation is a great problem which needs to be solved urgently at present. The search for fine aggregates to replace natural river sand for preparing high-performance concrete is a necessary trend of green development of concrete materials.
The steel slag is a waste material of steel making, 1000 more than ten thousand tons of steel slag are produced in China every year, 200 more than ten thousand tons of steel slag are produced in Wu-Tou steel every year at present, the utilization rate is low, a large amount of waste steel slag not only occupies a large area of land, but also causes serious pollution to the environment. The slag is ground and used as the admixture of cement to prepare slag cement, and the utilization rate is still low. The coarse aggregate prepared by the steel slag has poor volume stability, so the application of the coarse aggregate in concrete is limited. With the continuous development of the automobile industry in China, the number of waste rubber tires is large, the recycling of waste rubber is also a great problem, the preparation of rubber concrete by using rubber powder particles is an important direction, but the compressive strength and the elastic modulus of the rubber concrete prepared by using the rubber powder particles are still low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problem that the poor volume stability is easily caused when the steel slag is used as the concrete aggregate at present, the aging and steam curing treatment is carried out on the steel slag particles with the particle size of 1.18-4.75 mm, the unstable substances such as calcium oxide, magnesium oxide and the like in the steel slag are reduced, and the stability of the steel slag as the concrete fine aggregate is improved; waste tire rubber particles (powder) with the particle size of less than 1.75mm are introduced, steel slag expansion stress is released by utilizing the characteristic of low elastic modulus of the rubber particles, and modifiers such as NaOH solution, silane coupling agent solution and the like are adopted to carry out surface hydrophilic modification on the rubber particles, so that the interface connection condition of the rubber particles and a cementing material is improved, the strength of concrete is improved, and the volume stability of the steel slag fine aggregate concrete is further improved. The processed steel slag and the waste rubber particles are mixed according to a certain proportion to replace natural river sand in concrete, so as to prepare the steel slag and waste rubber mixed fine aggregate concrete. Meanwhile, the powdery high-performance water reducing agent is doped into the concrete, so that the water-cement ratio of the concrete can be effectively reduced, the strength of the concrete is improved, and the setting time of the concrete is shortened.
According to the invention, by adopting a mixed compounding technology, the natural river sand is replaced by the steel slag and waste rubber mixed fine aggregate, the concrete material with good stability, high elastic modulus, high strength and high performance is prepared, and a high-strength, high-volume stability, low-density and low-elastic modulus collaborative design method and a preparation technology are provided.
The invention aims to solve the technical problem of providing a concrete product of waste steel slag and waste rubber fine aggregate and a preparation method thereof, and aims to solve the problem of poor volume stability caused by the use of the steel slag as concrete aggregate.
To achieve these objects and other advantages in accordance with the present invention, there is provided a waste steel slag and waste rubber fine aggregate concrete product comprising, by weight, 15 to 25 parts of cement, 10 to 22.5 parts of machine-made sand, 45 to 55 parts of sand, 2.25 to 10 parts of steel slag, 2 to 8 parts of modified rubber particles, 5 to 15 parts of water, and 0.02 to 0.05 part of a water reducing agent.
Preferably, the cement is one of ordinary portland cement or sulphoaluminate cement.
Preferably, the machine-made sand comprises 25-35% of 20-40 mesh quartz sand, 45-55% of 40-80 mesh quartz sand and 15-25% of 80-120 mesh quartz sand by mass fraction.
Preferably, the particle size of the steel slag is less than 4.75mm, and the apparent density Tg is more than 2900kg/m3And the porosity is less than 47%.
Preferably, the modified rubber has a particle diameter of waste rubber powder of 2.00mm or less, 1.00mm or less, and 0.60mm or less, and the modified rubber has an average particle diameter of 1.75mm or less.
Preferably, the modified rubber particles are prepared by performing alkali treatment on waste rubber powder in a NaOH solution with the mass fraction of 10% and then performing chemical modification in a silane coupling agent modifying solution.
Preferably, the water reducing agent is a powdery high-performance water reducing agent, and the water reducing rate of the water reducing agent is more than or equal to 20%, the gas content of the water reducing agent is less than or equal to 5%, and the 1d strength ratio of the water reducing agent is more than or equal to 160%.
The invention provides a preparation method of a waste steel slag and waste rubber fine aggregate concrete product, which comprises the following steps in parts by weight:
s1, stirring cement, machine-made sand, gravel, steel slag and modified rubber particles in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water and a water reducing agent into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
and S4, placing the blank prepared in the step S3 in a curing box, curing, and then demolding to obtain the waste steel slag and waste rubber fine aggregate concrete product.
Preferably, in step S4, the blank is placed in a curing box for curing for 24 h.
The invention at least comprises the following beneficial effects:
the invention fully utilizes the steel mill by-product steel slag, determines the treatment mode of the waste steel slag, and applies the waste steel slag to concrete for engineering construction. The steel slag adopted by the invention has the characteristics of small particle size, large specific surface area and the like, is suitable for being used as a cement admixture, can partially replace river sand to form high-strength concrete, and is beneficial to improving the bearing capacity and the anti-seismic performance of the concrete.
The invention utilizes rubber products such as waste tires and the like, determines the surface treatment mode of rubber particles, improves the interface connection condition of the rubber particles and a cementing material, and improves the performance of concrete by applying the rubber particles to the concrete.
The invention designs the proportioning range of the powder material according to the principle of enhancing the hydration activity of the material, and the powder material is mixed with water and then cured and molded to obtain a compact blank. The prepared steel slag and waste rubber mixed fine aggregate concrete has 28d compressive strength of more than or equal to 30MPa, waste rubber particles and slag fine aggregates can replace a certain amount of river sand machine to prepare sand, and 365d shrinkage is less than or equal to 3.5 multiplied by 10-4Elastic modulus is not less than 3.0 multiplied by 104MPa。
The invention provides a high-strength and high-volume stability collaborative design method of steel slag and waste rubber mixed fine aggregate concrete, a new high-performance concrete material is prepared, and the problems that the volume stability is poor due to the fact that the steel slag is used as the concrete fine aggregate at present and the strength of the concrete is reduced due to the fact that the waste rubber fine aggregate with low elastic modulus is difficult to design in a coordinated mode are solved.
The invention has convenient construction and simple process, is especially suitable for small-volume field road mixing, and has good road performance, small shrinkage and good durability.
According to the invention, the steel slag and waste rubber mixed fine aggregate is researched and developed by adopting a mixed compounding technology to replace natural river sand, so that the concrete material with good stability, high elastic modulus, high strength and high performance is prepared. By defining the concrete bearing capacity, the deformation characteristic and the anti-seismic performance of the concrete, important test basis and technical support are provided for the application in the civil structure. The research results have important theoretical significance for comprehensive utilization of the steel slag and the waste rubber tires, and have positive promotion effects and engineering application values for protecting ecological environment and promoting technological progress of civil engineering green construction technology. Greatly reduces the burden of industrial solid waste discharge on the environment, reduces the production cost of concrete, reduces the resource consumption, realizes the functionalization, the greening and the high-valued of products while consuming a large amount of steel slag and waste rubber, and has good economic benefit and social benefit. Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The invention provides a waste steel slag and waste rubber fine aggregate concrete product which comprises, by weight, 15-25 parts of cement, 10-22.5 parts of machine-made sand, 45-55 parts of gravel, 2.25-10 parts of steel slag, 2-8 parts of modified rubber particles, 5-15 parts of water and 0.02-0.05 part of a water reducing agent.
The cement is one of ordinary portland cement or sulphoaluminate cement.
The machine-made sand comprises 25-35% of 20-40 mesh quartz sand, 45-55% of 40-80 mesh quartz sand and 15-25% of 80-120 mesh quartz sand by mass.
The steel slag has a particle size of less than 4.75mm and an apparent density more than 2900kg/m3And the porosity is less than 47%.
The particle diameter of the modified rubber is composed of waste rubber powder with the particle diameter of less than 2.00mm, less than 1.00mm and less than 0.60mm, and the average particle diameter of the modified rubber particles is less than 1.75 mm.
The modified rubber particles are prepared by carrying out alkali treatment on waste gas rubber powder in a NaOH solution with the mass fraction of 10%, and then carrying out chemical modification in a silane coupling agent modified solution.
The water reducing agent is selected from a powdery high-performance water reducing agent, the water reducing rate of the water reducing agent is more than or equal to 20%, the gas content of the water reducing agent is less than or equal to 5%, and the 1d strength ratio of the water reducing agent is more than or equal to 160%.
The invention provides a preparation method of a waste steel slag and waste rubber fine aggregate concrete product, which comprises the following steps in parts by weight:
s1, stirring cement, machine-made sand, gravel, steel slag and modified rubber particles in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water and a water reducing agent into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
and S4, placing the blank prepared in the step S3 in a curing box, curing, and then demolding to obtain the waste steel slag and waste rubber fine aggregate concrete product.
In step S4, the blank is placed in a curing box and cured for 24 h.
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description. It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
Example 1
A waste steel slag and waste rubber fine aggregate concrete product is composed of the following raw materials in parts by weight: 15 parts of cement, 10 parts of machine-made sand, 45 parts of gravel, 2.25 parts of steel slag, 2 parts of modified rubber particles, 5 parts of water and 0.02 part of water reducing agent; the machine-made sand comprises 25% of 20-40 mesh quartz sand, 55% of 40-80 mesh quartz sand and 20% of 80-120 mesh quartz sand by mass.
The preparation method of the waste steel slag and waste rubber fine aggregate concrete product comprises the following steps in parts by weight:
s1, adding cement, machine-made sand, gravel, steel slag and modified rubber particles into a stirrer, stirring for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water and a water reducing agent into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
s4, placing the blank prepared in the step S3 in a curing box, curing for 24 hours, and then demolding to obtain the waste steel slag and waste rubber fine aggregate concrete product.
Example 2
A waste steel slag and waste rubber fine aggregate concrete product is composed of the following raw materials in parts by weight: 17 parts of cement, 13 parts of machine-made sand, 47 parts of gravel, 5 parts of steel slag, 4 parts of modified rubber particles, 7 parts of water and 0.03 part of water reducing agent; the machine-made sand comprises 35% of 20-40 mesh quartz sand, 45% of 40-80 mesh quartz sand and 20% of 80-120 mesh quartz sand by mass.
The preparation method of the waste steel slag and waste rubber fine aggregate concrete product comprises the following steps in parts by weight:
s1, adding cement, machine-made sand, gravel, steel slag and modified rubber particles into a stirrer, stirring for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water and a water reducing agent into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
s4, placing the blank prepared in the step S3 in a curing box, curing for 24 hours, and then demolding to obtain the waste steel slag and waste rubber fine aggregate concrete product.
Example 3
A waste steel slag and waste rubber fine aggregate concrete product is composed of the following raw materials in parts by weight: 20 parts of cement, 16 parts of machine-made sand, 50 parts of gravel, 6 parts of steel slag, 5 parts of modified rubber particles, 10 parts of water and 0.035 part of water reducing agent; the machine-made sand comprises 30% of 20-40 mesh quartz sand, 45% of 40-80 mesh quartz sand and 25% of 80-120 mesh quartz sand by mass.
The preparation method of the waste steel slag and waste rubber fine aggregate concrete product comprises the following steps:
s1, stirring cement, machine-made sand, gravel, steel slag and modified rubber particles in a stirrer for 1-2 min according to the parts by weight, and uniformly mixing to obtain a dry mixture;
s2, adding water and a water reducing agent into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
s4, placing the blank prepared in the step S3 in a curing box, curing for 24 hours, and then demolding to obtain the waste steel slag and waste rubber fine aggregate concrete product.
Example 4
A waste steel slag and waste rubber fine aggregate concrete product is composed of the following raw materials in parts by weight: 22 parts of cement, 19 parts of machine-made sand, 52 parts of gravel, 8 parts of steel slag, 6.5 parts of modified rubber particles, 13 parts of water and 0.04 part of water reducing agent; the machine-made sand comprises 28% of 20-40 mesh quartz sand, 52% of 40-80 mesh quartz sand and 15% of 80-120 mesh quartz sand by mass.
The preparation method of the waste steel slag and waste rubber fine aggregate concrete product comprises the following steps in parts by weight:
s1, stirring cement, machine-made sand, gravel, steel slag and modified rubber particles in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water and a water reducing agent into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
s4, placing the blank prepared in the step S3 in a curing box, curing for 24 hours, and then demolding to obtain the waste steel slag and waste rubber fine aggregate concrete product.
Example 5
A waste steel slag and waste rubber fine aggregate concrete product is composed of the following raw materials in parts by weight: 25 parts of cement, 22.5 parts of machine-made sand, 55 parts of gravel, 10 parts of steel slag, 8 parts of modified rubber particles, 15 parts of water and 0.05 part of water reducing agent; the machine-made sand comprises 30% of 20-40 mesh quartz sand, 50% of 40-80 mesh quartz sand and 20% of 80-120 mesh quartz sand by mass.
The preparation method of the waste steel slag and waste rubber fine aggregate concrete product comprises the following steps in parts by weight:
s1, stirring cement, machine-made sand, gravel, steel slag and modified rubber particles in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water and a water reducing agent into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
s4, placing the blank prepared in the step S3 in a curing box, curing for 24 hours, and then demolding to obtain the waste steel slag and waste rubber fine aggregate concrete product.
The test results of the compressive strength test (the clean slurry material for the compressive strength test of the GB/T25183-;
table 1 test results of performance indexes of waste steel slag and waste rubber fine aggregate concrete products prepared in examples 1 to 5
Figure BDA0002974157980000071
Figure BDA0002974157980000081
As can be seen from Table 1, the compressive strength of the concrete products of waste steel slag and waste rubber fine aggregates prepared in example 1 was maintained for 7 days>21MPa, and compressive strength of 14 days and 28 days of curing>Compressive strength of 30MPa and curing for 120 days>45 MPa; flexural strength after 7 days of curing>4MPa, and flexural strength of 28 days after curing>6.5MPa, and the compression strength and the breaking strength of the material are increased at the later stage. The shrinkage rate is less than 3.5 multiplied by 10 after 120 days of curing and 365 days of curing-4. Therefore, the material has good mechanical property and good volume stability.
The compressive strength of the concrete product of waste steel slag and waste rubber fine aggregate prepared in the above example 2 after curing for 7 days>22MPa, and compressive strength of 14 days and 28 days of curing>31MPa, and compressive strength of 120 days of curing>45.5 MPa; flexural strength after 7 days of curing>5MPa, and flexural strength of 28 days after curing>7MPa, and the compressive strength and the flexural strength of the material are increased at the later stage. The shrinkage rate is less than 3.5 multiplied by 10 after 120 days of curing and 365 days of curing-4. Therefore, the material has good mechanical property and good volume stability.
The compressive strength of the concrete product of waste steel slag and waste rubber fine aggregate prepared in the above example 3 after being cured for 7 days>22.5MPa, and compressive strength of 14 days and 28 days of curing>31.5MPa, and cured for 120 daysCompressive strength>44.5 MPa; flexural strength after 7 days of curing>5MPa, and flexural strength of 28 days after curing>7MPa, and the compressive strength and the flexural strength of the material are increased at the later stage. The shrinkage rate is less than 3.5 multiplied by 10 after 120 days of curing and 365 days of curing-4. Therefore, the material has good mechanical property and good volume stability.
The compressive strength of the concrete product of waste steel slag and waste rubber fine aggregate prepared in the above example 4 after curing for 7 days>20.5MPa, and compressive strength of 14 days and 28 days of curing>30.5MPa, and compressive strength for 120 days of maintenance>44 MPa; flexural strength after 7 days of curing>4.5MPa, and flexural strength after 28 days of maintenance>6.5MPa, and the compression strength and the breaking strength of the material are increased at the later stage. The shrinkage rate is less than 3.5 multiplied by 10 after 120 days of curing and 365 days of curing-4. Therefore, the material has good mechanical property and good volume stability.
The compressive strength of the concrete product of waste steel slag and waste rubber fine aggregate prepared in the above example 5 after curing for 7 days>22MPa, and compressive strength of 14 days and 28 days of curing>32MPa, and compressive strength of 120 days of curing>45 MPa; flexural strength after 7 days of curing>5MPa, and flexural strength of 28 days after curing>7.5MPa, and the compression strength and the breaking strength of the material are increased at the later stage. The shrinkage rate is less than 3.5 multiplied by 10 after 120 days of curing and 365 days of curing-4. Therefore, the material has good mechanical property and good volume stability.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.

Claims (9)

1. The waste steel slag and waste rubber fine aggregate concrete product is characterized by comprising, by weight, 15-25 parts of cement, 10-22.5 parts of machine-made sand, 45-55 parts of gravel, 2.25-10 parts of steel slag, 2-8 parts of modified rubber particles, 5-15 parts of water and 0.02-0.05 part of a water reducing agent.
2. The waste steel slag and waste rubber fine aggregate concrete product according to claim 1, wherein the cement is one of ordinary portland cement or sulphoaluminate cement.
3. The waste steel slag and waste rubber fine aggregate concrete product according to claim 1, wherein the machine-made sand comprises 25-35% by mass of 20-40 mesh quartz sand, 45-55% by mass of 40-80 mesh quartz sand, and 15-25% by mass of 80-120 mesh quartz sand.
4. The concrete product of waste steel slag and waste rubber fine aggregate according to claim 1, wherein the steel slag has a particle size of less than 4.75mm and an apparent density > 2900kg/m3And the porosity is less than 47%.
5. The waste steel slag and waste rubber fine aggregate concrete product according to claim 1, wherein the modified rubber has a particle size of waste rubber powder of 2.00mm or less, 1.00mm or less, and 0.60mm or less, and the modified rubber has an average particle size of 1.75mm or less.
6. The waste steel slag and waste rubber fine aggregate concrete product according to claim 1 or 5, wherein the modified rubber particles are prepared by subjecting waste rubber powder to alkali treatment in a 10% NaOH solution by mass fraction and then to chemical modification in a silane coupling agent modifying solution.
7. The concrete product of waste steel slag and waste rubber fine aggregates as claimed in any one of claims 1 to 6, wherein the water reducing agent is a powdery high-performance water reducing agent, and has a water reducing rate of not less than 20%, a gas content of not more than 5%, and a 1d strength ratio of not less than 160%.
8. The method for preparing the waste steel slag and waste rubber fine aggregate concrete product according to any one of claims 1 to 7, which comprises the following steps in parts by weight:
s1, stirring cement, machine-made sand, gravel, steel slag and modified rubber particles in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water and a water reducing agent into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
and S4, placing the blank prepared in the step S3 in a curing box, curing, and then demolding to obtain the waste steel slag and waste rubber fine aggregate concrete product.
9. The method for preparing a waste steel slag and waste rubber fine aggregate concrete product according to claim 8, wherein the green body is placed in a curing box for curing for 24 hours in step S4.
CN202110270501.1A 2021-03-12 2021-03-12 Waste steel slag and waste rubber fine aggregate concrete product and preparation method thereof Pending CN112979227A (en)

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CN114853421A (en) * 2022-05-09 2022-08-05 中建八局检测科技有限公司 Steel slag and machine-made sand double-doped concrete and preparation method thereof
CN115872703A (en) * 2022-12-23 2023-03-31 厦门天润锦龙建材有限公司 3D printing lightweight concrete prepared from modified rubber powder and preparation method thereof

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EP2789593A2 (en) * 2013-04-11 2014-10-15 ITALCEMENTI S.p.A. Concrete screed with recycled rubber from discarded tyres
CN112142400A (en) * 2020-09-09 2020-12-29 武汉市汉阳市政建设集团有限公司 Concrete with steel slag and waste rubber as fine aggregate and application thereof

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WO2014020623A1 (en) * 2012-08-03 2014-02-06 Edilgori S.P.A. Concrete multilayer panel with rubber aggregate wythe
EP2789593A2 (en) * 2013-04-11 2014-10-15 ITALCEMENTI S.p.A. Concrete screed with recycled rubber from discarded tyres
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Publication number Priority date Publication date Assignee Title
CN114853421A (en) * 2022-05-09 2022-08-05 中建八局检测科技有限公司 Steel slag and machine-made sand double-doped concrete and preparation method thereof
CN115872703A (en) * 2022-12-23 2023-03-31 厦门天润锦龙建材有限公司 3D printing lightweight concrete prepared from modified rubber powder and preparation method thereof
CN115872703B (en) * 2022-12-23 2024-04-26 厦门天润锦龙建材有限公司 3D printing lightweight concrete prepared from modified rubber powder and preparation method thereof

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Application publication date: 20210618