A kind of anti-crack 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 for concrete and crack resistance, applied in the field of crack-resistant concrete and its preparation, can solve the problems of reducing the thickness of the concrete protective layer of steel bars, reducing the frost resistance and durability of concrete, affecting the durability of structures, etc. The effect of crack resistance, improved slump loss, and reduced temperature difference between inside and outside
Active Publication Date: 2021-05-11
BEIJING ZEHUA ROAD & BRIDGE ENG CO LTD
View PDF6 Cites 0 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
And if the crack exceeds the range of normal working cracks, it will affect the durability of the structure, and under the influence of load or physical, chemical and other factors, it will reduce the thickness of the concrete protective layer of the steel bar, and it is easy to cause the concrete surface Spalling will accelerate the corrosion of steel bars, reduce the frost resistance and durability of concrete, and even cause collapse accidents. Therefore, cracks in concrete must be controlled
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
Embodiment 1
[0047] A method for preparing crack-resistant concrete, comprising the steps of: stirring 380kg cement, 55kg fly ash, 850kg crushed stone, and 680kg sand for 35 minutes, then adding 52kg steel fiber, 35kg tuff and 13kg bentonite, stirring for 35 minutes, and then adding 75kg polypropylene fiber, 22kg silane coupling agent, 15 parts of water reducer A prepared from pulp waste liquid, add 7kg retarding water reducer B and 230kg water after stirring for 25min, add 22kg sodium bicarbonate after stirring for 40min, and finally Add 10kg of silica fume and stir for 55 minutes to obtain crack-resistant concrete.
[0048] Among them, the retarding water reducer is prepared by mixing naphthalene-based water reducer, polycarboxylate water reducer and sodium lignosulfonate with a mass ratio of 1:1:1.2.
Embodiment 2-8
[0050] A preparation method of crack-resistant concrete is carried out according to the method in Example 1, the difference is that it is prepared according to the ratio of each raw material in Table 2.
[0051] Table 2:
[0052]
Embodiment 9
[0054] A preparation method for crack-resistant concrete, carried out according to the method in Example 1, the difference is that the retarding water reducer is composed of naphthalene-based water reducer and polycarboxylate water reducer with a mass ratio of 1:0.8:1 Prepared by mixing sodium lignosulfonate.
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
Property
Measurement
Unit
length
aaaaa
aaaaa
diameter
aaaaa
aaaaa
diameter
aaaaa
aaaaa
Login to view more
Abstract
The invention discloses a crack-resistant concrete and a preparation method thereof. The crack-resistant concrete is prepared from the following raw materials in parts by weight: 300-450 parts of cement, 2-10 parts of retarding water reducer B, and 40-75 parts of pulverized coal Ash, 60‑100 parts polypropylene fiber, 15‑30 parts silane coupling agent, 40‑65 parts steel fiber, 6‑15 parts silicon powder, 800‑900 parts gravel, 600‑780 parts sand, 25‑45 parts Tuff, 10-15 parts of bentonite, 10-20 parts of water reducer A prepared from pulp waste liquid, 15-30 parts of sodium bicarbonate and 200-250 parts of water; the preparation method is: cement, fly ash, crushed After stirring stone and sand for 30-40min, then add steel fiber, tuff and bentonite, stir for 30-40min, then add polypropylene fiber, silane coupling agent, and water reducer A prepared from pulp waste liquid, and stir for 20-30min Finally, add coagulation water reducer and water, stir for 30-50 minutes, add sodium bicarbonate, and finally add silica fume, and stir for 50-60 minutes to obtain crack-resistant concrete.
Description
technical field [0001] The invention relates to the technical field of building construction, more specifically, it relates to a crack-resistant concrete and a preparation method thereof. Background technique [0002] In recent years, my country's transportation infrastructure has developed rapidly, and a large number of concrete bridges have been built in various places. During the construction and use of bridges, reports about cracks affecting project quality and even bridge collapse are common. Concrete cracks are formed due to factors such as internal stress and external loads of concrete, as well as temperature changes. And if the crack exceeds the range of normal working cracks, it will affect the durability of the structure, and under the influence of load or physical, chemical and other factors, it will reduce the thickness of the concrete protective layer of the steel bar, and it is easy to cause the concrete surface Spalling will accelerate the corrosion of steel ...
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