CN111620624A - Self-compacting concrete and preparation method thereof - Google Patents

Self-compacting concrete and preparation method thereof Download PDF

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Publication number
CN111620624A
CN111620624A CN202010449800.7A CN202010449800A CN111620624A CN 111620624 A CN111620624 A CN 111620624A CN 202010449800 A CN202010449800 A CN 202010449800A CN 111620624 A CN111620624 A CN 111620624A
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China
Prior art keywords
self
compacting concrete
equal
cement
less
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CN202010449800.7A
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Chinese (zh)
Inventor
郑丽
陈露一
黄有强
李信
张志豪
包嘉诚
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China Railway Major Bridge Engineering Group Co Ltd MBEC
China Railway Bridge Science Research Institute Ltd
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China Railway Major Bridge Engineering Group Co Ltd MBEC
China Railway Bridge Science Research Institute Ltd
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Priority to CN202010449800.7A priority Critical patent/CN111620624A/en
Publication of CN111620624A publication Critical patent/CN111620624A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • C04B2201/52High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The application relates to self-compacting concrete and a preparation method thereof, wherein the self-compacting concrete comprises cement, silica fume, mineral powder, fly ash microbeads, limestone powder, waste stone powder, aggregate, water, a water reducing agent and an expanding agent, and the cement consumption of the C50 grade self-compacting concrete is reduced to 150-200 kg/m by doping a large amount of high-quality mineral admixture and waste stone powder to replace the cement3The problems of high cracking and large volume shrinkage of early hydration heat of the self-compacting concrete are solved, the use amount of high-energy-consumption and high-pollution product cement is reduced, waste stone powder in industrial waste, namely machine-made sand is effectively utilized, waste materials are changed into valuable things, the effective allocation of resources is improved, and the problems of coal ash microbeads and spherical limestone powder are solvedThe admixture solves the problems of large viscosity and low fluidity of the self-compacting concrete.

Description

Self-compacting concrete and preparation method thereof
Technical Field
The application belongs to the field of concrete, and particularly relates to self-compacting concrete and a preparation method thereof.
Background
With the continuous development of the infrastructure, the concrete structure gradually advances towards the direction of complexity, high strength and high performance, various large-span and novel structural bridges continuously appear, and higher requirements are provided for the performance of the concrete. The high-strength self-compacting concrete has higher strength and excellent working performance, the self-compacting performance can meet the requirements of complex structure construction such as small operation space, difficult vibration, dense reinforcing steel bars and the like, and the higher strength can effectively resist the external damage.
In order to meet the performances of high strength, high fluidity, high filling property and the like, the dosage of a cementing material of the high-strength self-compacting concrete is generally higher than that of common concrete, particularly the dosage of cement, and the dosage of the cement of the current C50 grade self-compacting concrete is generally 350kg/m3Compared with common concrete, the concrete has the advantages that the early hydration speed of the concrete is high, the hydration heat release is large, the strength is increased quickly, the early temperature drop shrinkage stress is large, the temperature shrinkage cracking is easy to occur, and the mechanical property and the durability of the concrete are adversely affected. Under the influence of topography and transportation, natural river sand resources in western mountainous areas of China are deficient, machine-made sand is usually adopted to replace the natural river sand, and byproduct stone powder generated by producing the machine-made sand is generally directly discarded, so that environmental pollution is caused. The related art replaces cement in concrete by adding mineral admixtures, thereby reducing the cement dosage, however, most mineral admixtures have lower early activity, which results in lower early strength of a gelled system and can not meet the requirement of C50 grade self-compacting concrete.
Disclosure of Invention
The application provides self-compacting concrete and a preparation method thereof, which aim to solve the problems of environmental pollution caused by stone powder discarding and low early strength of the concrete and incapability of meeting the requirements of C50-grade self-compacting concrete caused by a large amount of mineral admixture.
In one aspect, the present application provides a self-compacting concrete, comprising the following raw materials in parts by weight:
the particle sizes of the adopted limestone powder and the waste limestone powder are smaller than that of cement, because: the limestone powder and waste stone powder with small particle sizes can effectively fill concrete gaps, improve the wet bulk density of each component, enable the hardened concrete microstructure to be more compact, and effectively improve the strength and durability of the concrete, thereby ensuring the concrete strength with low cement consumption and high mineral admixture consumption.
This application adopts the partial quantity of cement in the abandonment mountain flour replacement concrete, solves the abandonment mountain flour and causes environmental pollution's problem, and the early strength of the self-compaction concrete of preparation is high, and its 28 days compressive strength is not less than 61.1MPa, has satisfied the requirement of C50 grade self-compaction concrete, has solved the problem that a large amount of mineral admixture that mixes leads to the early strength of concrete low.
Preferably, the water-to-cement ratio of the self-compacting concrete is 0.24-0.26.
Preferably, the self-compacting concrete has a sand to cement ratio of 1.63 to 1.67.
The cement used is preferably a pii 525 cement, for the reasons: after the cement consumption is reduced, the mechanical and durability properties of the concrete can not be ensured, and compared with the common Portland cement, the P II 525 cement with high clinker component content can generate more Ca (OH) after hydration2So as to stimulate the activity of other admixtures and generate more hydration products, thereby improving the strength of the concrete.
Preferably, the calcium carbonate content of the limestone powder is more than or equal to 75 wt%, the water demand ratio is less than or equal to 98 wt%, the screen residue of a 45-micron square-hole sieve is less than or equal to 15 wt%, and the MB value is less than or equal to 1.4; the 0.075mm sieve residue of the waste stone powder is less than or equal to 0.1 wt%, the MB value is less than or equal to 0.5, and the water requirement ratio is less than or equal to 105%.
Preferably, the fineness modulus of the machine-made sand is 2.4-2.8, the content of the stone powder is less than or equal to 5.0 wt%, and the water absorption rate is less than or equal to 3 wt%.
Preferably, the particle size of the crushed stone is 5-20 mm, the mud content is less than or equal to 0.5 wt%, and the crushing value is less than or equal to 10%.
The water reducing agent adopted by the application is preferably a viscosity reduction type polycarboxylate superplasticizer, the viscosity of the concrete can be further reduced by doping the viscosity reduction type polycarboxylate superplasticizer, and the prepared concrete can meet the self-compaction requirement under the synergistic effect of the fly ash microbeads and the spherical limestone powder.
The swelling agent used in the present application is preferably a calcium oxide-based swelling agent.
In another aspect, the present application provides a method for preparing self-compacting concrete, comprising the steps of:
(1) weighing the raw materials according to the mixing ratio;
(2) pouring the broken stone, the sand, the waste stone powder, the cementing material and the expanding agent into a stirrer in sequence, and stirring and mixing uniformly; pouring the mixture of the water reducing agent and the water into a stirrer to be continuously stirred, and uniformly stirring to form self-compacting concrete;
(3) the self-compacting concrete does not need to be vibrated and tamped, and can be directly poured or put into a test mould for leveling.
According to the self-compacting concrete, a high-activity mineral admixture (comprising silica fume, mineral powder and fly ash microbeads) and an inert filling material (comprising limestone powder and waste limestone powder) are adopted to replace part of the cement dosage which has the largest contribution to hydration heat release in the concrete, and the problems of high hydration heat release and large volume shrinkage of the self-compacting concrete are solved by combining a proper amount of an expanding agent, wherein the waste limestone powder and high-quality limestone powder are used as the inert filling material to have the largest contribution to the reduction of hydration heat; the mineral powder and the fly ash microbeads can also reduce the heat of hydration to a certain extent; the formation of an expansion type hydration product is promoted by a proper amount of the expanding agent, so that the problem of volume reduction of the self-compacting concrete can be effectively solved; the fly ash microbeads and the limestone powder are spherical particles, and after the fly ash microbeads and the limestone powder are mixed into concrete, the viscosity of the concrete can be effectively reduced by virtue of the ball effect, the fluidity of the concrete is improved, and the problems of high viscosity and low fluidity commonly existing in self-compacting concrete are solved.
Compared with the prior art, the method has the following advantages and beneficial effects:
(1) according to the method, a large amount of industrial byproducts such as mineral powder, fly ash microbeads and limestone powder and industrial waste-waste limestone powder are utilized to prepare the self-compacting concrete, waste materials are changed into valuable materials, a large amount of waste materials generated in industrial production and engineering activities are recycled, and the method has important economic and environmental benefits.
(2) The application reduces the consumption of the high-energy-consumption and high-pollution product cement, and reduces the consumption of the cement to 200kg/m3The following concrete still can ensure that the 28-day compressive strength of the self-compacting concrete is not less than 61.1MPa, meets the requirement of C50 grade, and is generally 350kg/m in comparison with the cement dosage in the related technology3The above C50 grade self-compacting concrete reduces early hydration heat of the concrete, reduces the risks of easy cracking and large volume shrinkage of the self-compacting concrete, and effectively improves the durability of the self-compacting concrete.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The experimental methods used in the examples and comparative examples are conventional methods unless otherwise specified, and the raw materials and reagents used in the examples and comparative examples are commercially available, and the examples and comparative examples specifically use the following raw materials:
the adopted cement is PII 525 portland cement.
The average grain diameter of the adopted silica fume is less than or equal to 0.1 mu m, and SO2The content is more than or equal to 90 percent, wherein the active SO2The content (soluble in saturated lime water) is more than or equal to 40 percent.
The performance of the adopted mineral powder meets the requirements ofThe specific surface area of S95 grade mineral powder in granulated blast furnace slag powder (GB/T18046-2017) in cement, mortar and concrete is more than or equal to 400m2The fluidity ratio is more than or equal to 95 percent, the ignition loss is less than or equal to 3.0 weight percent, the activity index of 7d is more than or equal to 75 percent, and the activity index of 28d is more than or equal to 95 percent.
The performance of the adopted fly ash micro-beads meets the requirement of class I fly ash in fly ash for cement and concrete (GB/T1596-2017), the water requirement ratio is less than or equal to 95 percent, the fineness is less than or equal to 12 percent, the ignition loss is less than or equal to 5 percent, and the 28d activity index is more than or equal to 70 percent.
The limestone powder is spherical, the calcium carbonate content is more than or equal to 75 wt%, the water demand ratio is less than or equal to 98%, the screen residue of a 45-micron square-hole sieve is less than or equal to 15%, and the MB value is less than or equal to 1.4.
The 0.075mm screen allowance of the adopted waste stone powder is less than or equal to 0.1 wt%, the MB value is less than or equal to 0.5, and the water demand ratio is less than or equal to 105%.
The performance of the machine-made sand meets the relevant requirements in the technical Specification for applying artificial sand concrete (JGJ/T241-2011), the fineness modulus of the II-zone graded sand is 2.4-2.8, the content of stone powder is less than or equal to 5.0 wt%, and the water absorption is less than or equal to 3%.
The adopted crushed stone has the particle size of 5-20 mm, the mud content is less than or equal to 0.5 wt%, and the crushing value is less than or equal to 10%.
The water reducing agent is a viscosity reduction type polycarboxylic acid high-efficiency water reducing agent.
The adopted expanding agent is a calcium oxide expanding agent, and the performance of the expanding agent meets the type I requirement in GB/T23439-2017 standard.
The preparation method of the self-compacting concrete provided by the embodiment of the application comprises the following steps:
(1) weighing raw materials according to the mixing ratio shown in Table 1;
(2) pouring the broken stone, the sand, the cementing material and the expanding agent into a stirrer in sequence, after the mixture is stirred for 30s, pouring the mixture of the water reducing agent and the water into the stirrer, and continuously stirring for 2min to form the self-compacting concrete; and (6) performing performance test.
(3) The self-compacting concrete does not need to be vibrated and tamped, and can be directly poured or put into a test mould for leveling.
Example 1
The self-compacting concrete provided by the embodiment has a water-cement ratio of 0.24 and a sand rate of 0.5, and the cementing material is composed of cement, silica fume, mineral powder, fly ash, limestone powder and waste limestone powder.
Example 2
The self-compacting concrete provided by the embodiment has a water-cement ratio of 0.25 and a sand rate of 0.51, and the cementing material is composed of cement, silica fume, mineral powder, fly ash, limestone powder and waste limestone powder.
Example 3
The self-compacting concrete provided by the embodiment has a water-cement ratio of 0.26 and a sand rate of 0.52, and the cementing material is composed of cement, silica fume, mineral powder, fly ash, limestone powder and waste stone powder.
Example 4
The self-compacting concrete provided by the embodiment has a water-cement ratio of 0.25 and a sand rate of 0.52, and the cementing material is composed of cement, silica fume, mineral powder, fly ash, limestone powder and waste limestone powder.
Example 5
The self-compacting concrete provided by the embodiment has a water-cement ratio of 0.25 and a sand rate of 0.52, and the cementing material is composed of cement, silica fume, mineral powder, fly ash, limestone powder and waste limestone powder.
Comparative example 1
The self-compacting concrete provided by the comparative example has the water-cement ratio of 0.26 and the sand rate of 0.52, and the cementing material consists of cement, silica fume, mineral powder, fly ash, limestone powder and waste limestone powder.
Comparative example 2
Different from example 1, the self-compacting concrete provided by the comparative example has the cement, the mineral powder and the fly ash as the cementing materials, the water-cement ratio is 0.30, and the test results of the freshly-mixed self-compacting concrete are shown in table 2.
Comparative example 3
Unlike example 1, the self-compacting concrete of this comparative example has a cementitious material composed of cement and mineral powder, a water-to-cement ratio of 0.31, and the test results of freshly mixed self-compacting concrete are shown in table 2.
Comparative example 4
Different from example 1, in the self-compacting concrete provided in the present comparative example, the cementitious material was composed of cement, silica fume, mineral powder, fly ash, limestone powder, and waste stone powder, the water-to-gel ratio was 0.30, and the test results of freshly mixed self-compacting concrete are shown in table 2.
Comparative example 5
Different from example 1, the self-compacting concrete provided by the comparative example consists of cementing material cement, silica fume, mineral powder, fly ash and waste stone powder, the water-to-gel ratio is 0.25, and the test results of the freshly-mixed self-compacting concrete are shown in table 2.
Comparative example 6
Different from example 1, the self-compacting concrete provided by the comparative example consists of cementing materials, namely cement, silica fume, mineral powder, fly ash and limestone powder, the water-cement ratio is 0.25, and the test results of the freshly-mixed self-compacting concrete are shown in table 2.
Comparative example 7
Different from example 1, the self-compacting concrete provided by the comparative example consists of cementing materials, cement, silica fume, mineral powder and fly ash, the water-cement ratio is 0.25, and the test results of the freshly-mixed self-compacting concrete are shown in table 2.
According to the technical specification for JGJ/T283-2012 self-compacting concrete application, the self-compacting concrete prepared in examples 1-5 and comparative examples 1-7 has the slump expansion, the slump expansion and J-ring expansion difference, the expansion time T500 and other performances, under the condition of no vibration, a cubic compression-resistant test block of 150X 150mm is formed, after standard curing for 28d, the compression strength of the concrete is tested according to the GB/T50081-2016 ordinary concrete mechanical property test method standard, and the test results are shown in Table 2.
TABLE 1 self-compacting concrete mix proportion (kg/m)3)
TABLE 2 self-compacting concrete Performance test results
As can be seen from Table 1, the cement contents of the C50 self-compacting concretes prepared in examples 1-5 are all 200kg/m3Below, the amount of cement used in the self-compacting concrete is much lower than that used in the conventional C50 self-compacting concrete of comparative example 2 and comparative example 3, which are the same grade strength. As can be seen from Table 2, the working condition and the strength grade of the prepared C50 self-compacting concrete meet the requirements, and the performance of most examples is better than that of the C50 self-compacting concrete prepared in comparative examples 2 and 3.
As can be seen from example 2, comparative example 5, comparative example 6 and comparative example 7, the incorporation of the waste stone powder brings certain adverse effects on the working performance and mechanical properties of the concrete, but the incorporation of the waste stone powder can eliminate the adverse effects brought by the waste stone powder and improve the working performance and mechanical properties of the concrete. When the amount of the waste stone powder is excessively large, it is shown from the test results of examples 2 and 4 and comparative example 1 that the workability of the concrete is further lowered and the strength is also greatly lowered as the amount of the waste stone powder is increased. The waste stone powder is not suitable for being mixed too much. It is understood from examples 3 and 5 that the strength of the prepared C50 concrete is reduced by further increasing the amount of limestone powder and reducing the amount of cement, but the workability is more excellent. The C50 self-compacting concrete prepared by the application has excellent working performance and mechanical property, and low cement consumption, and simultaneously uses a large amount of limestone powder with low price and rich materials and industrial waste limestone powder, so that the cost can be reduced by using a large amount of local materials, and the pollution of waste powder to the environment in industrial production can be reduced.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The self-compacting concrete is characterized by comprising the following raw materials in proportion:
wherein the particle sizes of the limestone powder and the waste stone powder are both smaller than that of the cement.
2. A self-compacting concrete according to claim 1, characterized in that: the water-cement ratio of the self-compacting concrete is 0.24-0.26.
3. A self-compacting concrete according to claim 1, characterized in that: the sand-cement ratio of the self-compacting concrete is 1.63-1.67.
4. A self-compacting concrete according to claim 1, characterized in that: the cement is PII 525 cement.
5. A self-compacting concrete according to claim 1, characterized in that: the calcium carbonate content of the limestone powder is more than or equal to 75 wt%, the water demand ratio is less than or equal to 98 wt%, the screen residue of a 45-micron square-hole sieve is less than or equal to 15 wt%, and the MB value is less than or equal to 1.4.
6. A self-compacting concrete according to claim 1, characterized in that: the 0.075mm sieve residue of the waste stone powder is less than or equal to 0.1 wt%, the MB value is less than or equal to 0.5, and the water requirement ratio is less than or equal to 105%.
7. A self-compacting concrete according to claim 1, characterized in that: the fineness modulus of the machine-made sand is 2.4-2.8, the content of stone powder is less than or equal to 5.0 wt%, and the water absorption rate is less than or equal to 3 wt%.
8. A self-compacting concrete according to claim 1, characterized in that: the particle size of the broken stone is 5-20 mm, the mud content is less than or equal to 0.5 wt%, and the crushing value is less than or equal to 10%.
9. A self-compacting concrete according to claim 1, characterized in that: the water reducing agent is a viscosity reduction type polycarboxylic acid high-efficiency water reducing agent; the swelling agent is calcium oxide swelling agent.
10. A method for preparing a self-compacting concrete according to any one of claims 1-9, characterized in that it comprises the following steps:
(1) weighing the raw materials according to the mixing proportion of any one of claims 1 to 9;
(2) pouring the broken stone, the sand, the waste stone powder, the cementing material and the expanding agent into a stirrer in sequence, and stirring and mixing uniformly; pouring the mixture of the water reducing agent and the water into a stirrer to be continuously stirred, and uniformly stirring to form self-compacting concrete;
(3) the self-compacting concrete does not need to be vibrated and tamped, and can be directly poured or put into a test mould for leveling.
CN202010449800.7A 2020-05-25 2020-05-25 Self-compacting concrete and preparation method thereof Pending CN111620624A (en)

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