NiTi alloy fiber concrete and preparation method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of alloy fiber and concrete, which is applied in the field of concrete, can solve the problems of low flexural strength and fatigue resistance, and easy brittle cracks, and achieve the effects of improving seismic ductility, enhancing resistance, and reducing maintenance
Pending Publication Date: 2022-03-29
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
View PDF1 Cites 2 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0003] The object of the present invention is a kind of NiTi alloy fiber concrete and its preparation method, mix NiTi alloy fiber in concrete, increase concrete structure safe
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Example Embodiment
[0028] The preparation method of a kind of NiTi alloy fiber concrete in the embodiment is specifically the following steps:
[0029] (1) adding cement, sand and gravel, fly ash, silica fume and slag to the mixer in proportion and stirring for 2-3min;
[0030] (2) Mix the water reducing agent and water in proportion and stir to form a mixed solution, then add it into the mixer twice, add 50% of the mixed solution for the first time, and add the remaining 50% of the mixed solution for the second time, each time After adding the mixture, stir for 1min-2min;
[0031] (3) Add steel fibers and NiTi fibers into the stirring pot, and evenly load them while stirring, add them within 1 min, and then stir for 3 to 5 min, add them to the mold, and after molding and demoulding, the prepared test piece adopts Standard curing, curing age is 28d; NiTi alloy fiber reinforced concrete is obtained.
Example Embodiment
[0032] Example 1:
[0033] A NiTi alloy fiber concrete is mixed by mass percentage of the following raw materials: 350 parts of cement, 700 parts of river sand, 1050 parts of crushed stone, and 16.3 parts of NiTi alloy fibers (0.67% by mass, volume fraction 0.25%), 62.5 parts of fly ash, 50 parts of slag, 37.5 parts of silica fume, 15 parts of water reducing agent, and 150 parts of water.
Example Embodiment
[0034] Example 2:
[0035] A NiTi alloy fiber concrete is mixed by mass percentage of the following raw materials: 350 parts of cement, 700 parts of river sand, 1050 parts of crushed stone, 32.6 parts of NiTi alloy fibers (1.33% by mass, 32.6 parts by volume) 0.50%), 62.5 parts of fly ash, 50 parts of slag, 37.5 parts of silica fume, 15 parts of water reducing agent, and 150 parts of water.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention discloses NiTi alloy fiber concrete and a preparation method thereof. The concrete comprises the following raw materials in percentage by mass: 10-15% of cement, 2-3% of fly ash, 2-2.5% of slag, 1.5-2% of silica fume, 25-30% of sand, 40-45% of gravel, 0.5-3% of NiTi alloy fiber, 5-10% of water and 0.5-1% of a water reducing agent, and the sum of the mass percentages of all the raw materials is 100%. The composite NiTi-based alloy toughened cement-based composite material has the characteristics of high strength, high toughness, high durability and the like; the anti-seismic ductility of the structure is improved, the resistance of the structure to severe environments is enhanced, generation of concrete cracks is slowed down, and the service life of the structure is prolonged. According to the invention, the unique shape memory effect and the phase change superelastic NiTi alloy fiber are adopted, the related cost of maintenance and the like of the structure in the use process is reduced, the characteristic enables the structure to still play a predetermined role well under the condition of atrocious weather environment for a long time, and even if the structure of the test piece is damaged, the test piece can still work normally. And the fibers can still bear stress, so that stress holding is realized.
Description
technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a NiTi alloy fiber concrete and a preparation method thereof. Background technique [0002] As the most widely used building material in the world, cement-based materials are widely used in the field of civil engineering. However, as a brittle porous material, ordinary cement-based materials usually have defects such as low flexural strength and brittle failure. These defects are serious It restricts the long-term safe use of concrete structures. Fiber-reinforced concrete can control the cracks of concrete through fibers, increase the tensile strength of concrete, and improve the comprehensiveness of concrete. At present, the commonly used fiber reinforced material is steel fiber. Although steel fiber can improve the compressive strength of concrete, its enhancement of tensile strength is not obvious, which makes concrete prone to cracking. NiTi alloy fiber is a ne...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more