Freeze-thaw resistant concrete and preparation method thereof

A freeze-thaw resistance and concrete technology, applied in the field of concrete, can solve the problems of poor freeze-thaw resistance of freeze-thaw-resistant concrete, improve the poor freeze-thaw resistance, improve the bonding strength, and improve the anti-cracking performance. Effect

Active Publication Date: 2021-04-09
杭州申华混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defect of poor freeze-thaw resistance durability of freeze-thaw-resistant concrete, the application provides a kind of freeze-thaw-resistant concrete and a preparation method thereof, adopting the following technical scheme:

Method used

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  • Freeze-thaw resistant concrete and preparation method thereof
  • Freeze-thaw resistant concrete and preparation method thereof
  • Freeze-thaw resistant concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0045] Composite sol preparation: Add 200g of ammonium nitrate to 5000g of deionized water, stir and mix and collect the mixed solution, then add 500g of aluminum isopropoxide to the mixed solution, stir and mix at room temperature, collect the reaction solution and place it at 45°C Next, add 250g tetraethyl orthosilicate to the reaction solution, stir for 6 hours, let it stand for aging and collect the modified sol solution, mix the modified sol solution with the porous silica sol at a mass ratio of 1:1 and Homogenize at 4500r / min for 25min to obtain composite sol 1;

[0046] Preparation of freeze-thaw resistant modified fiber: take 5000g of EVA resin, 4500g of TPE resin and 2000g of TPR resin in a mixer, mix and collect the elastomer mixture, put the elastomer mixture in the HAAKE micro mixing extruder, melt spinning Process and collect the spun blended elastomer fibers, control the spinning temperature to 185°C, the winding temperature to 20r / min, and the screw speed to 30r...

preparation example 2

[0048] Composite sol preparation: Add 220g of ammonium nitrate to 6000g of deionized water, stir and mix and collect the mixed solution, then add 55g of aluminum isopropoxide to the mixed solution, stir and mix at room temperature, collect the reaction solution and place it at 52°C Next, add 270g of tetraethyl orthosilicate to the reaction solution, stir for 7 hours, let it stand for aging and collect the modified sol solution, mix the modified sol solution with the porous silica sol at a mass ratio of 1:1 and Homogenized at 5200r / min for 27min to obtain composite sol 2;

[0049] Preparation of freeze-thaw resistant modified fiber: Take 5500g of EVA resin, 4750g of TPE resin and 2500g of TPR resin in a mixer, mix and collect the elastomer mixture, put the elastomer mixture in the HAAKE micro mixing extruder, melt spinning Process and collect the spun blended elastomer fibers, control the spinning temperature to 190°C, the winding temperature to 35r / min, and the screw speed to ...

preparation example 3

[0051] Composite sol preparation: Add 250g of ammonium nitrate to 8000g of deionized water, stir and mix and collect the mixed solution, then add 60g of aluminum isopropoxide to the mixed solution, stir and mix at room temperature, collect the reaction solution and place it at 60°C Next, add 300g tetraethyl orthosilicate to the reaction solution, stir for 8 hours, let it stand for aging and collect the modified sol, mix the modified sol with the porous silica sol at a mass ratio of 1:1 and Homogenize at 6000r / min for 30min to obtain composite sol 3;

[0052] Preparation of freeze-thaw resistant modified fiber: Take 6000g of EVA resin, 5000g of TPE resin and 3000g of TPR resin in a mixer, mix and collect the elastomer mixture, put the elastomer mixture in the HAAKE micro mixing extruder, melt spinning Process and collect the spun blended elastomer fibers, control the spinning temperature to 195°C, the coiling temperature to 50r / min, and the screw speed to 35r / min;

[0053] The...

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Abstract

The invention relates to the field of concrete, and particularly discloses freeze-thaw resistant concrete and a preparation method thereof. The freeze-thaw resistant concrete is prepared from, by weight, 30-50 parts of coarse aggregate, 30-40 parts of fine aggregate, 10-15 parts of cement, 8-15 parts of water, 4-6 parts of mineral powder, 2-3 parts of coal ash, 0.1-0.5 part of additive, 6-8 parts of composite sol and 1-2 parts of freeze-thaw resistant modified fiber; wherein the freeze-thaw-resistant modified fibers comprise calcium sulfate whisker chopped fibers with the length of 1-2 mm. The calcium sulfate chopped whiskers and the composite sol are adopted as modified materials and are filled in the concrete, and in the process that the concrete is frozen and cracks, the phenomenon that concrete cracks are continuously expanded in a freeze-thaw environment and consequently the concrete cracks are broken is prevented through stress existing in entangled fibers; therefore, the loading mode of the composite fibers between the concrete is improved, and the freeze-thaw crack resistance of the freeze-thaw resistant concrete is further improved.

Description

technical field [0001] The application relates to the field of concrete, more specifically, it relates to a freeze-thaw resistant concrete and a preparation method thereof. Background technique [0002] When the concrete structure is in the cold or seaside area for a long time, the concrete will be damaged, cracked and peeled off due to the action of frost heaving water, which will eventually lead to the reduction of the frost resistance and the bearing capacity of the concrete structure before the service life is reached. Even the road collapsed. In fact, there are two types of freeze-thaw damage problems often encountered in structural engineering: one is in the natural environment, the concrete structure is in a cold area, and is only affected by the medium of water and seawater. The second category is artificially sprinkle deicing salt or deicing agent on the road surface in winter, and the pavement is subject to the dual effects of water and deicing salt or deicing age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/24C04B14/38C04B22/08C04B16/06
CPCC04B28/24C04B14/383C04B22/08C04B16/0633C04B2201/50C04B18/12C04B14/068C04B7/00C04B22/002C04B18/08C04B2103/0068
Inventor 裴恩郭耀鹏马超
Owner 杭州申华混凝土有限公司
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