A kind of freeze-thaw resistant concrete and preparation method thereof

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

Active Publication Date: 2022-02-08
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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  • A kind of freeze-thaw resistant concrete and preparation method thereof
  • A kind of freeze-thaw resistant concrete and preparation method thereof
  • A kind of 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 application relates to the field of concrete, and specifically discloses a freeze-thaw-resistant concrete and a preparation method thereof. The freeze-thaw-resistant concrete comprises the following parts 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 fly ash, 0.1-0.5 parts of admixtures, 6-8 parts of composite sol and 1-2 parts of freeze-thaw resistance modification Fibers; the freeze-thaw-resistant modified fibers include calcium sulfate whisker chopped fibers with a length of 1-2 mm. The application uses calcium sulfate chopped whiskers and composite sol as modified materials, which are filled in the concrete. During the process of freezing and forming cracks in the concrete, the stress existing in the entangled fibers prevents the concrete from cracking in the freezing and thawing environment. Continuously expand the phenomenon that leads to its collapse, improve the load mode of composite fibers between concrete, and further improve the anti-freeze-thaw crack performance of freeze-thaw concrete.

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 Patents(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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