CN110950592A - Ultrahigh-performance concrete and preparation method thereof - Google Patents
Ultrahigh-performance concrete and preparation method thereof Download PDFInfo
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- CN110950592A CN110950592A CN201910009970.0A CN201910009970A CN110950592A CN 110950592 A CN110950592 A CN 110950592A CN 201910009970 A CN201910009970 A CN 201910009970A CN 110950592 A CN110950592 A CN 110950592A
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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
- 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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- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an ultrahigh-performance concrete and a preparation method thereof, wherein the concrete comprises 500 parts of cement, 25-150 parts of micro silica fume, 2.5-15 parts of nano silica, 5-17.5 parts of polycarboxylic acid high-efficiency water reducing agent, 250-750 parts of sand, 90-150 parts of water, 18-120 parts of steel fiber, 5-30 parts of polyvinyl alcohol fiber and 2-10 parts of hydroxyethyl cellulose according to the mixing ratio of the concrete by mass fraction. The prepared ultra-high performance concrete has excellent performances of high strength, low shrinkage, good crack resistance, low water-cement ratio and the like, and has important engineering significance for development of concrete materials, improvement of bridge structure service life and guarantee of maintenance and reinforcement reliability.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to ultra-high performance concrete and a preparation method thereof.
Background
The concrete has been widely used due to its characteristics of abundant raw material sources, convenient construction, adjustable performance according to the need, etc. However, the defects of heavy weight, low tensile strength, poor crack resistance, large shrinkage deformation and the like of concrete have become the bottleneck of the development of a large-span high-strength structure. In order to enable the concrete to be suitable for modern building structure forms such as large span, ultrahigh strength and the like, the concrete with excellent performances such as high strength, ultrahigh toughness and the like appears. Although the research on ultrahigh-strength and ultrahigh-toughness concrete at home and abroad is more from theory to experimental research at present, the cracking resistance is poor and even the bursting phenomenon is caused due to the over high strength of some concrete, and the ultrahigh-strength and ultrahigh-toughness concrete cannot be widely applied to actual engineering due to the low cost performance and the like. Therefore, it is necessary to prepare economical concrete with good performances such as low water-cement ratio, low shrinkage, high ductility and durability by comprehensively considering the factors such as the current technical equipment, economy, structural requirements and the like.
Disclosure of Invention
The invention aims to provide the ultra-high performance concrete which has the advantages of simple preparation method, low water-cement ratio, low shrinkage, high ductility, high compressive strength, good durability and the like.
In order to solve the problems, the ultra-high performance concrete and the preparation method thereof are characterized in that: the concrete comprises 500 parts by mass of cement, 25-150 parts by mass of micro silica fume, 2.5-15 parts by mass of nano silica, 5-17.5 parts by mass of polycarboxylic acid high-efficiency water reducing agent, 250-750 parts by mass of sand, 90-150 parts by mass of water, 18-120 parts by mass of steel fiber, 5-30 parts by mass of polyvinyl alcohol fiber and 2-10 parts by mass of hydroxyethyl cellulose.
The micro silica fume is encrypted silica fume, and SiO in the micro silica fume2The content is more than or equal to 95 percent.
The size range of the nano silicon dioxide is 20-100nm, and the specific surface area is 280m2/g。
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30%.
The grain size of the sand is 0.1-0.6mm, and the sand grading is continuous grading.
The cement is ordinary portland cement with a strength grade of 52.5.
The length of the steel fiber is 8-25mm, and the tensile strength is 2850 MPa.
The length of the polyvinyl alcohol fiber is 3-12mm, and the tensile strength is 1620 MPa.
An ultra-high performance concrete and a preparation method thereof, comprising the following steps:
(1) weighing the micro silica fume, the nano silica, the sand and the cement in parts by mass, adding into a stirrer, and stirring for 2-3 min;
(2) then adding the polycarboxylic acid water reducing agent and water in parts by mass, stirring for 2-4min,
(3) finally, adding the steel fiber, the polyvinyl alcohol fiber and the hydroxyethyl cellulose in parts by mass, and stirring for 2-3 min; pouring the contracted high-extension ultrahigh-performance concrete after stirring into a mould and carrying out standard maintenance.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a graph showing the compressive strength curve of the selected ultra-high performance concrete of example 1 of the present invention after curing for 28 d.
FIG. 2 is a curve of the compressive strength of the selected ultra-high performance concrete of example 2 of the present invention after curing for 28 d.
FIG. 3 is a curve of the compressive strength of the selected ultra-high performance concrete of example 3 of the present invention after curing for 28 d.
FIG. 4 is a curve of the compressive strength of the selected ultra-high performance concrete of example 4 of the present invention after curing for 28 d.
FIG. 5 is a graph showing the compressive strength of the selected ultra-high performance concrete of example 5 after curing for 28 d.
In the figure: the abscissa is the displacement value and the ordinate is the applied load value.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
An ultra-high performance concrete, the concrete comprising: 500 parts of cement, 100 parts of micro silica fume, 10 parts of nano silicon dioxide, 10 parts of a polycarboxylic acid high-efficiency water reducing agent, 600 parts of sand, 122 parts of water, 35 parts of steel fiber, 6 parts of polyvinyl alcohol fiber and 2 parts of hydroxyethyl cellulose.
The compressive strength of the low-shrinkage high-elongation ultrahigh-performance concrete 28d is 152.64MPa, as shown in the attached figure 1 of the specification (the cross section of a compressive strength test piece is 1600 mm)2Compressive strength is equal to the load divided by the cross-sectional area in the figure), 28d tensile strength is 9.4MPa, and 28d maximum tensile strain 6200 mu epsilon is measured.
Example 2
An ultra-high performance concrete, the concrete comprising: 500 parts of cement, 100 parts of micro silica fume, 10 parts of nano silicon dioxide, 10 parts of a polycarboxylic acid high-efficiency water reducing agent, 600 parts of sand, 122 parts of water, 35 parts of steel fiber, 8 parts of polyvinyl alcohol fiber and 2 parts of hydroxyethyl cellulose.
The 28d compressive strength of the low-shrinkage high-elongation ultrahigh-performance concrete is 159.22MPa, as shown in the attached figure 2 of the specification (the cross section of a compressive strength test piece is 1600 mm)2Compressive strength is equal to the load divided by the cross-sectional area in the figure), 28d tensile strength is 9.8MPa, and 28d maximum tensile strain is 6800 mu epsilon.
Example 3
An ultra-high performance concrete, the concrete comprising: 500 parts of cement, 100 parts of micro silica fume, 10 parts of nano silicon dioxide, 10 parts of a polycarboxylic acid high-efficiency water reducing agent, 600 parts of sand, 122 parts of water, 53 parts of steel fiber, 6 parts of polyvinyl alcohol fiber and 2 parts of hydroxyethyl cellulose.
The 28d compressive strength of the low-shrinkage high-elongation ultrahigh-performance concrete is 148.36MPa, as shown in the attached figure 3 of the specification (the cross section of a compressive strength test piece is 1600 mm)2Compressive strength equal to the load divided by the cross-sectional area in the figure), 28d resistanceTensile strength was 10.3MPa, maximum tensile strain 7100. mu. epsilon. measured at 28 d.
Example 4
An ultra-high performance concrete, the concrete comprising: 500 parts of cement, 100 parts of micro silica fume, 10 parts of nano silicon dioxide, 10 parts of polycarboxylic acid high-efficiency water reducing agent, 600 parts of sand, 122 parts of water, 105 parts of steel fiber and 2 parts of hydroxyethyl cellulose.
The 28d compressive strength of the low-shrinkage high-elongation ultrahigh-performance concrete is 145.94MPa, as shown in the attached figure 4 of the specification (the cross section of a compressive strength test piece is 1600 mm)2Compressive strength is equal to the load divided by the cross-sectional area in the figure), 28d tensile strength is 8.9MPa, and 28d maximum tensile strain 6200 mu epsilon is measured.
Example 5
An ultra-high performance concrete, the concrete comprising: 500 parts of cement, 100 parts of micro silica fume, 10 parts of nano silicon dioxide, 10 parts of polycarboxylic acid high-efficiency water reducing agent, 600 parts of sand, 122 parts of water, 16 parts of polyvinyl alcohol fiber and 2 parts of hydroxyethyl cellulose.
The 28d compressive strength of the low-shrinkage high-elongation ultrahigh-performance concrete is 100.82MPa, as shown in the attached figure 5 of the specification (the cross section of a compressive strength test piece is 1600mm2, and the compressive strength is equal to the load divided by the cross section in the figure), the 28d tensile strength is 7.3MPa, and the maximum tensile strain is 5900 mu epsilon measured at 28 d.
Claims (10)
1. An ultra-high performance concrete, characterized in that: the concrete comprises 500 parts by mass of cement, 25-150 parts by mass of micro silica fume, 2.5-15 parts by mass of nano silica, 5-17.5 parts by mass of polycarboxylic acid high-efficiency water reducing agent, 250-750 parts by mass of sand, 90-150 parts by mass of water, 18-120 parts by mass of steel fiber, 5-30 parts by mass of polyvinyl alcohol fiber and 2-10 parts by mass of hydroxyethyl cellulose.
2. According to the claims1, the ultra-high performance concrete is characterized in that the micro silica fume is encrypted silica fume, and SiO in the micro silica fume2The content is more than or equal to 95 percent.
3. The ultra-high performance concrete as claimed in claim 1, wherein the micro silica fume is dense silica fume, and SiO is contained in the micro silica fume2The content is more than or equal to 95 percent.
4. The ultra-high performance concrete as claimed in claim 1, wherein the nano silica has a size ranging from 20 to 100nm and a specific surface area of 280m2/g。
5. The ultrahigh-performance concrete of claim 1, wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30%.
6. The ultra-high performance concrete of claim 1, wherein the sand has a particle size of 0.1-0.6mm and the sand gradation is a continuous gradation.
7. The ultra-high performance concrete of claim 1, wherein the cement is Portland cement with a strength grade of 52.5.
8. The ultra-high performance concrete of claim 1, wherein the steel fibers have a length of 8-25mm and a tensile strength of 2850 MPa.
9. The ultra-high performance concrete of claim 1, wherein the length of the polyvinyl alcohol fiber is 3-12mm, and the tensile strength is 1620 MPa.
10. The method of preparing the ultra-high performance concrete of claim 1, comprising the steps of:
(1) weighing the micro silica fume, the nano silica, the sand and the cement in parts by mass, adding into a stirrer, and stirring for 20-60 s;
(2) then adding the polycarboxylic acid water reducing agent and water in parts by mass, stirring for 2-4min,
(3) finally, adding the steel fiber, the polyvinyl alcohol fiber and the hydroxyethyl cellulose in parts by mass, and stirring for 20-60 s; pouring the contracted high-extension ultrahigh-performance concrete after stirring into a mould and carrying out standard maintenance.
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| CN201811123788 | 2018-09-26 | ||
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113264738A (en) * | 2021-06-24 | 2021-08-17 | 郑州大学 | High-performance cement-based composite material and preparation method thereof |
| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
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2019
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| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
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Application publication date: 20200403 |