A kind of anti-freeze-thaw concrete and preparation method thereof
A concrete and anti-freeze-thaw technology, applied in the field of concrete, can solve the problems of fiber damage, affecting the bonding performance of recycled carbon fiber and concrete matrix, etc., and achieve the effect of improving utilization rate, improving freeze-thaw resistance performance, and simple and easy preparation process
Active Publication Date: 2022-05-03
烟台泰航混凝土有限公司
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Problems solved by technology
However, the surface of recycled carbon fiber is often coated with a smooth resin coating, which greatly affects the bonding performance between recycled carbon fiber and concrete matrix, making it difficult for recycled carbon fiber to fully play the role of modification like original carbon fiber. Coating removal methods, such as acidic or alkaline solutions to remove epoxy coatings often cause damage to the fiber itself
Method used
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Examples
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preparation example 1
[0051] A kind of chopped regenerated carbon fiber, adopts following method to make:
[0052] Step 1: Cut the waste carbon fiber into 3mm chopped strands, then configure an acetic acid solution with a mass fraction of 40%, take the same mass of acetic acid solution as the chopped carbon fiber, completely immerse the chopped carbon fiber in the acetic acid solution, soak for 5 hours , to obtain pretreated chopped carbon fibers;
[0053] Step 2: Weigh hydrogen peroxide and N,N-dimethylformamide at a volume ratio of 2:1 and mix to obtain a mixture, heat it to 90°C, add the chopped carbon fiber pretreated in step 1, and react in a closed environment 40min, followed by washing and drying to obtain chopped regenerated carbon fibers.
preparation example 2-3
[0055] A chopped regenerated carbon fiber, based on Preparation Example 1, the difference mainly lies in the different process conditions in the preparation process, see Table 2 for details.
preparation example 1-3
[0057] Preparation example Preparation Example 1 Preparation example 2 Preparation example 3 Soaking time (h) in step 1 5 8 7 Reaction time in step 2 (min) 40 30 50
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Abstract
The present application relates to concrete, and more specifically, it relates to a freeze-thaw resistant concrete and a preparation method thereof. Freeze-thaw resistant concrete is made of the following raw materials by mass: 300-350 parts of Portland cement; 650-700 parts of sand; 1270-1370 parts of crushed stone; 15-20 parts of fly ash; 15-18 parts of admixture; 30~55 parts of composite carbon fiber; 150~180 parts of water; the preparation method is: mix and stir Portland cement and composite carbon fiber, add other raw materials and stir to obtain a mixture; add admixture to the mixture, stir and disperse evenly Obtain the concrete pouring material; pour the concrete pouring material into the mold, put the carbon fiber net into the mold after vibrating and compacting, place the carbon fiber net on the concrete surface after plastering, and lift it, so that the carbon fiber net is evenly spread into the concrete surface until Invisible to the naked eye. The anti-freeze-thaw concrete of the application has the advantages of economically and effectively making the waste carbon fiber play a role in improving the anti-freeze-thaw performance of the concrete, and at the same time improving the anti-freeze-thaw performance of the concrete.
Description
technical field [0001] The present application relates to concrete, and more specifically, it relates to a freeze-thaw resistant concrete and a preparation method thereof. Background technique [0002] In the cold regions of Northeast and Northwest China, concrete buildings are exposed to harsh environments for a long time, resulting in frequent occurrence of various durability problems, such as freeze-thaw damage, sulfate attack and seepage damage, among which freeze-thaw damage is the most harmful to concrete. . In the freeze-thaw damage, the internal and external cracks of the concrete will expand, the internal structure will be loose and deteriorated, and the fracture performance and bending toughness of the material will be reduced. Therefore, it is of great practical significance to study how to improve the frost resistance of concrete and prevent or delay the freeze-thaw damage of buildings. [0003] At present, the use of fiber fabrics to strengthen the frost resis...
Claims
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IPC IPC(8): C04B28/04C04B111/20
CPCC04B28/04C04B2111/20C04B14/06C04B14/02C04B18/08C04B24/18C04B24/02C04B14/386C04B24/04C04B22/068C04B24/124
Inventor 朱文龙朱建华朱宝宝
Owner 烟台泰航混凝土有限公司