CN114014613A - Salt corrosion resistant concrete and preparation method thereof - Google Patents
Salt corrosion resistant concrete and preparation method thereof Download PDFInfo
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- CN114014613A CN114014613A CN202111540920.9A CN202111540920A CN114014613A CN 114014613 A CN114014613 A CN 114014613A CN 202111540920 A CN202111540920 A CN 202111540920A CN 114014613 A CN114014613 A CN 114014613A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/06—Aluminous 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of concrete, and provides salt corrosion resistant concrete which comprises the following components in parts by weight: 220-380 parts of cement, 180-230 parts of coarse aggregate, 200-260 parts of fine aggregate, 80-100 parts of rice hull ash, 40-60 parts of silica fume, 50-80 parts of water, 20-30 parts of composite fiber and 10-20 parts of additive. According to the invention, cement, silica fume and rice hull ash are used as gel materials, compact and hard stone bodies can be formed after hydration, fine aggregate and coarse aggregate are added to improve the strength of the concrete, and the use of composite fiber and additive is combined, so that the pores in the concrete can be reduced, the corrosion of sulfate in the soil to the concrete is avoided, and the salt corrosion resistant concrete is prepared. The results of the examples show that the 28d compressive strength of the salt corrosion resistant concrete provided by the invention is 70.5MPa, and the 28d compressive strength after the concrete is soaked in sodium sulfate is 64.7 MPa.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to salt corrosion resistant concrete and a preparation method thereof.
Background
In the process of road construction, concrete is a necessary building material, and is often exposed to complicated and variable environmental conditions in actual use, so that the concrete inevitably suffers from the comprehensive actions of physical, chemical, biological and the like of the service environment, and the durability of the concrete is reduced. Particularly, when the concrete is applied to severe conditions of natural environment, such as high salt, high alkali, severe temperature change and the like, the concrete structure is more seriously corroded.
In western regions of China, such as most regions of Ningxia and Gansu, Xinjiang and inner Mongolia, large-area saline-alkali soil exists, the content of sulfate in the soil in the regions is high, and sulfate can cause strong corrosion to concrete and steel bars in the concrete, thereby greatly influencing engineering construction in the western regions. Therefore, a concrete with excellent salt corrosion resistance is needed.
Disclosure of Invention
The invention aims to provide salt corrosion resistant concrete and a preparation method thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides salt corrosion resistant concrete which comprises the following components in parts by weight: 220-380 parts of cement, 180-230 parts of coarse aggregate, 200-260 parts of fine aggregate, 80-100 parts of rice hull ash, 40-60 parts of silica fume, 50-80 parts of water, 20-30 parts of composite fiber and 10-20 parts of additive.
Preferably, the coarse aggregate comprises one or more of limestone macadam, cobble and coal gangue.
Preferably, the fine aggregate comprises river sand and/or fly ash.
Preferably, the composite fibers comprise polypropylene fibers and steel fibers.
Preferably, the mass ratio of the polypropylene fibers to the steel fibers in the composite fibers is 1: 0.5-0.8.
Preferably, the admixture comprises a water reducing agent and a binder.
Preferably, the mass ratio of the water reducing agent to the binder in the admixture is 1: 0.3-0.6.
The invention also provides a preparation method of the salt corrosion resistant concrete in the technical scheme, which comprises the following steps:
(1) mixing cement, coarse aggregate, fine aggregate, rice hull ash, silica fume and water, and then stirring to obtain a mixture;
(2) and (2) mixing the mixture obtained in the step (1) with composite fibers and an additive, and stirring to obtain the salt corrosion resistant concrete.
Preferably, the stirring speed in the step (1) is 100-200 r/min, and the stirring time is 20-25 min.
Preferably, the stirring speed in the step (2) is 150-250 r/min, and the stirring time is 20-30 min.
The invention provides salt corrosion resistant concrete which comprises the following components in parts by weight: 220-380 parts of cement, 180-230 parts of coarse aggregate, 200-260 parts of fine aggregate, 80-100 parts of rice hull ash, 40-60 parts of silica fume, 50-80 parts of water, 20-30 parts of composite fiber and 10-20 parts of additive. According to the invention, cement, silica fume and rice hull ash are used as gel materials, compact and hard stone bodies can be formed after hydration, fine aggregate and coarse aggregate are added to improve the strength of the concrete, and the use of composite fiber and additive is combined, so that the pores in the concrete can be reduced, the corrosion of sulfate in the soil to the concrete is avoided, and the salt corrosion resistant concrete is prepared. The results of the examples show that the 28d compressive strength of the salt corrosion resistant concrete provided by the invention is 70.5MPa, and the 28d compressive strength after the concrete is soaked in sodium sulfate is 64.7 MPa.
Detailed Description
The invention provides salt corrosion resistant concrete which comprises the following components in parts by weight: 220-380 parts of cement, 180-230 parts of coarse aggregate, 200-260 parts of fine aggregate, 80-100 parts of rice hull ash, 40-60 parts of silica fume, 50-80 parts of water, 20-30 parts of composite fiber and 10-20 parts of additive.
The salt corrosion resistant concrete comprises, by mass, 220-380 parts of cement, preferably 250-350 parts of cement, and more preferably 280-320 parts of cement. In the invention, the cement is used as a cementing material, and can form a compact and hard stone body after being hydrated together with silica fume and rice hull ash. In the present invention, the cement is preferably portland cement or aluminate cement, and more preferably portland cement. The source of the cement is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
The salt corrosion resistant concrete comprises 180-230 parts of coarse aggregate, preferably 190-220 parts of cement by mass, and is calculated by 220-380 parts of cement. In the present invention, the coarse aggregate mainly functions as a framework in concrete. In the invention, the coarse aggregate preferably comprises one or more of limestone broken stones, cobbles and coal gangue, and more preferably limestone broken stones and/or coal gangue. In the invention, the particle size of the coarse aggregate is preferably 5-25 mm, and more preferably 5-20 mm.
The salt corrosion resistant concrete comprises 200-260 parts of fine aggregate, preferably 220-250 parts of fine aggregate, and more preferably 230-250 parts of fine aggregate by mass of cement of 220-380 parts. In the invention, the fine aggregate plays a role in filling and is matched with the coarse aggregate for use, thereby being beneficial to improving the strength of concrete. In the present invention, the fine aggregate preferably includes river sand and/or fly ash. In the invention, the particle size of the fine aggregate is preferably 0.075-5 mm, and more preferably 0.35-3 mm.
The salt corrosion resistant concrete comprises 80-100 parts by mass of rice hull ash, preferably 80-90 parts by mass of cement, and is calculated by 220-380 parts by mass of the cement. In the invention, the rice hull ash is used as a cementing material, and can form a compact and hard stone body together with cement and silica fume after hydration, and the rice hull ash is added to improve the strength of concrete, so that the concrete can be compacter.
The salt corrosion resistant concrete comprises 40-60 parts of silica fume, preferably 40-55 parts of cement by mass of 220-380 parts of cement. In the invention, the silica fume is used as a cementing material, and can form a compact and hard stone body after being hydrated together with cement and rice husk ash.
The salt corrosion resistant concrete provided by the invention comprises 50-80 parts of water, preferably 50-70 parts of cement by mass of 220-380 parts. In the invention, the water is used for uniformly mixing other raw materials.
The salt corrosion resistant concrete comprises 20-30 parts by mass of composite fibers, preferably 20-25 parts by mass of cement, and is calculated by 220-380 parts by mass of the cement. According to the invention, the composite fibers can be filled into the pores of the concrete, so that the pores inside the concrete are reduced, and the corrosion of sulfate in the soil to the concrete is avoided.
In the present invention, the composite fiber preferably includes polypropylene fiber and steel fiber. In the invention, the polypropylene fiber has a good water conduction effect, and the steel fiber has good strength, thereby being beneficial to improving the strength of concrete. In the present invention, the lengths of the polypropylene fibers and the steel fibers are preferably 45 to 60mm, and more preferably 50 to 60mm, independently.
In the invention, the mass ratio of the polypropylene fibers to the steel fibers in the composite fibers is preferably 1: 0.5-0.8, and more preferably 1: 0.5-0.6. According to the invention, the mass ratio of the polypropylene fiber to the steel fiber in the composite fiber is preferably controlled in the above range, so that the concrete with excellent salt corrosion resistance can be obtained.
The salt corrosion resistant concrete comprises, by mass, 220-380 parts of cement, 10-20 parts of an additive, preferably 10-15 parts. In the invention, the admixture and the composite fiber are beneficial to reducing the internal structure pores of the concrete, thereby avoiding the corrosion of sulfate in soil to the concrete.
In the present invention, the admixture preferably includes a water reducing agent and a binder. In the present invention, the water reducing agent is preferably a polycarboxylic acid water reducing agent. In the invention, the water reducing agent can play a good water reducing effect; the use of the binder can enable the composite fibers to be more tightly bound in the concrete, and the filling effect of the silica fume, the rice husk ash and the fine aggregate is matched, so that the reduction of the pores in the concrete is facilitated, and the corrosion of sulfate in the soil to the concrete is avoided. In the present invention, the binder is preferably a calcium saccharide.
In the invention, the mass ratio of the water reducing agent to the binder in the admixture is preferably 1: 0.3-0.6, and more preferably 1: 0.3-0.5. According to the invention, the mass ratio of the water reducing agent to the binder in the admixture is preferably controlled within the above range, so that the concrete with excellent salt corrosion resistance can be obtained.
According to the invention, cement, silica fume and rice hull ash are used as gel materials, compact and hard stone bodies can be formed after hydration, fine aggregate and coarse aggregate are added to improve the strength of the concrete, and the use of composite fiber and additive is combined, so that the pores in the concrete can be reduced, the corrosion of sulfate in the soil to the concrete is avoided, and the salt corrosion resistant concrete is prepared.
The invention also provides a preparation method of the salt corrosion resistant concrete in the technical scheme, which comprises the following steps:
(1) mixing cement, coarse aggregate, fine aggregate, rice hull ash, silica fume and water, and then stirring to obtain a mixture;
(2) and (2) mixing the mixture obtained in the step (1) with composite fibers and an additive, and stirring to obtain the salt corrosion resistant concrete.
The cement, the coarse aggregate, the fine aggregate, the rice hull ash, the silica fume and the water are mixed and stirred to obtain a mixture.
In the invention, the stirring speed is preferably 100-200 r/min, and more preferably 150-180 r/min; the stirring time is preferably 20-25 min, and more preferably 25 min.
After the mixture is obtained, the salt corrosion resistant concrete is obtained by mixing the mixture, the composite fiber and the additive and then stirring.
In the invention, the stirring speed is preferably 150-250 r/min, and more preferably 180-230 r/min; the stirring time is preferably 20-30 min, and more preferably 30 min.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
Example 1
(1) Mixing 280 parts by weight of Portland cement, 190 parts by weight of coal gangue with the particle size of 5-20 mm, 230 parts by weight of river sand with the particle size of 0.35-3 mm, 80 parts by weight of rice hull ash, 40 parts by weight of silica fume and 70 parts by weight of water, and then stirring at the speed of 180r/min for 25min to obtain a mixture;
(2) mixing the mixture with 25 parts by weight of composite fiber and 15 parts by weight of additive, and stirring at the speed of 230r/min for 30min to obtain salt corrosion resistant concrete; the composite fiber is composed of polypropylene fibers and steel fibers according to a mass ratio of 1:0.5, and the lengths of the polypropylene fibers and the steel fibers are both 50-60 mm; the additive is composed of a polycarboxylic acid water reducing agent and sugar calcium according to the mass ratio of 1: 0.5.
Example 2
(1) Mixing 320 parts by weight of portland cement, 210 parts by weight of coal gangue with the particle size of 5-20 mm, 260 parts by weight of river sand with the particle size of 0.35-3 mm, 80 parts by weight of rice hull ash, 50 parts by weight of silica fume and 80 parts by weight of water, and then stirring at the speed of 180r/min for 25min to obtain a mixture;
(2) mixing the mixture with 30 parts by weight of composite fiber and 10 parts by weight of additive, and then stirring for 30min at the speed of 230r/min to obtain salt corrosion resistant concrete; the composite fiber is composed of polypropylene fibers and steel fibers according to a mass ratio of 1:0.8, and the lengths of the polypropylene fibers and the steel fibers are both 50-60 mm; the additive is composed of a polycarboxylic acid water reducing agent and sugar calcium according to the mass ratio of 1: 0.5.
Example 3
(1) Mixing 260 parts by weight of aluminate cement, 220 parts by weight of coal gangue with the particle size of 5-20 mm, 240 parts by weight of river sand with the particle size of 0.35-3 mm, 95 parts by weight of rice hull ash, 55 parts by weight of silica fume and 70 parts by weight of water, and then stirring at the speed of 180r/min for 25min to obtain a mixture;
(2) mixing the mixture with 20 parts by weight of composite fibers and 18 parts by weight of additive, and then stirring at the speed of 230r/min for 30min to obtain salt corrosion resistant concrete; the composite fiber is composed of polypropylene fibers and steel fibers according to a mass ratio of 1:0.6, and the lengths of the polypropylene fibers and the steel fibers are both 50-60 mm; the additive is composed of a polycarboxylic acid water reducing agent and sugar calcium according to the mass ratio of 1: 0.3.
Comparative example 1
The difference from example 1 is that the composite fiber is omitted.
Comparative example 2
The difference from example 1 is that the external additive was omitted.
Comparative example 3
The difference from example 1 is that the composite fiber is composed of polypropylene fiber and steel fiber in a mass ratio of 1: 1.2.
Comparative example 4
The difference from the embodiment 1 is that the admixture consists of a polycarboxylic acid water reducing agent and a binder according to the mass ratio of 1:1.
According to GB/T50081 Standard test method for physical and mechanical properties of concrete, testing the 7d compressive strength and the 28d compressive strength of the concrete prepared in the examples 1-3 and the concrete prepared in the comparative examples 1-4, respectively soaking another group of the concrete prepared in the examples 1-3 and the concrete prepared in the comparative examples 1-4 in a sodium sulfate solution with the mass concentration of 5%, and testing the 7d compressive strength and the 28d compressive strength.
TABLE 1 Properties of concretes prepared in examples 1 to 3 and comparative examples 1 to 4
The embodiment shows that the salt corrosion resistant concrete provided by the invention has excellent compressive strength, and can still maintain good compressive strength after being soaked in sodium sulfate.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The salt corrosion resistant concrete comprises the following components in parts by weight: 220-380 parts of cement, 180-230 parts of coarse aggregate, 200-260 parts of fine aggregate, 80-100 parts of rice hull ash, 40-60 parts of silica fume, 50-80 parts of water, 20-30 parts of composite fiber and 10-20 parts of additive.
2. The salt corrosion resistant concrete of claim 1, wherein the coarse aggregate comprises one or more of limestone macadam, cobble and coal gangue.
3. The concrete according to claim 1, wherein the fine aggregate comprises river sand and/or fly ash.
4. The salt corrosion resistant concrete of claim 1, wherein said composite fibers comprise polypropylene fibers and steel fibers.
5. The salt corrosion resistant concrete according to claim 4, wherein the mass ratio of the polypropylene fibers to the steel fibers in the composite fibers is 1: 0.5-0.8.
6. The concrete for resisting salt corrosion according to claim 1, wherein the admixture comprises a water reducing agent and a binder.
7. The salt corrosion resistant concrete according to claim 6, wherein the mass ratio of the water reducing agent to the binder in the admixture is 1: 0.3-0.6.
8. The method for preparing the salt corrosion resistant concrete according to any one of claims 1 to 7, comprising the following steps:
(1) mixing cement, coarse aggregate, fine aggregate, rice hull ash, silica fume and water, and then stirring to obtain a mixture;
(2) and (2) mixing the mixture obtained in the step (1) with composite fibers and an additive, and stirring to obtain the salt corrosion resistant concrete.
9. The method according to claim 8, wherein the stirring speed in step (1) is 100 to 200r/min, and the stirring time is 20 to 25 min.
10. The preparation method according to claim 8, wherein the stirring speed in the step (2) is 150 to 250r/min, and the stirring time is 20 to 30 min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115536347A (en) * | 2022-10-20 | 2022-12-30 | 深圳市恒星建材有限公司 | High-performance low-carbon concrete |
| US20240059613A1 (en) * | 2022-08-16 | 2024-02-22 | Dalian University Of Technology | Curing agent for disposal of municipal solid waste incineration (mswi) fly ash and preparation method and use method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112079599A (en) * | 2020-09-17 | 2020-12-15 | 成都精准混凝土有限公司 | Enhanced silica fume concrete and preparation method thereof |
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2021
- 2021-12-16 CN CN202111540920.9A patent/CN114014613B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112079599A (en) * | 2020-09-17 | 2020-12-15 | 成都精准混凝土有限公司 | Enhanced silica fume concrete and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20240059613A1 (en) * | 2022-08-16 | 2024-02-22 | Dalian University Of Technology | Curing agent for disposal of municipal solid waste incineration (mswi) fly ash and preparation method and use method thereof |
| US11919811B1 (en) * | 2022-08-16 | 2024-03-05 | Dalian University Of Technology | Curing agent for disposal of municipal solid waste incineration (MSWI) fly ash and preparation method and use method thereof |
| CN115536347A (en) * | 2022-10-20 | 2022-12-30 | 深圳市恒星建材有限公司 | High-performance low-carbon concrete |
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