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Modified rubber concrete and preparation method thereof

A technology for modifying rubber and concrete, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of strength loss and concrete strength reduction, achieve slow growth rate, improve impact resistance, inhibit The effect of crack propagation

Inactive Publication Date: 2018-01-19
汪逸凡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention: Aiming at the problem that the strength of concrete is reduced due to the addition of rubber particles,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] Take 200 g of rubber powder, soak it in 600 mL of 5% sodium hydroxide solution for 20 hours, filter to obtain a filter residue, add the filter residue to 600 mL of 20% hydrogen peroxide, and dropwise add 10% sulfuric acid to adjust the pH to 4, At 50°C, the reaction was stirred at 300 r / min for 2 hours, then urea was added to adjust the pH to 8, and heated to 80°C, and the reaction was continued to stir for 1 hour. The filter cake was obtained by filtration. The filter cake was washed twice with deionized water and then dried. In the box, dry it to constant weight at 105°C to obtain modified rubber powder. Take 300g of ordinary Portland cement, 550g of fine aggregate, 1000g of coarse aggregate, 40g of modified rubber powder, 2g of basalt fiber, and 120g of deionized water. , put it into the mixer and mix it uniformly into a slurry, and then pour the slurry into the mold for molding. After demoulding, the surface is scraped and leveled, and watered for...

Example Embodiment

[0025] Example 2

[0026] Take 250 g of rubber powder, soak it in 750 mL of 5% sodium hydroxide solution for 22 hours, filter to obtain a filter residue, add the filter residue to 750 mL of 20% hydrogen peroxide, and dropwise add 10% sulfuric acid to adjust the pH to 4, At 55°C, the reaction was stirred at 350 r / min for 2h, then urea was added to adjust the pH to 8, and heated to 85°C, and the reaction was continued to stir for 1h. The filter cake was obtained by filtration. The filter cake was washed twice with deionized water and then dried. In a box, dry at 108°C to constant weight to obtain modified rubber powder. Take 350g of ordinary Portland cement, 600g of fine aggregate, 1100g of coarse aggregate, 45g of modified rubber powder, 2g of basalt fiber, and 135g of deionized water. , put it into the mixer and mix it uniformly into a slurry, and then pour the slurry into the mold for molding. After demoulding, the surface is scraped and leveled, and watered for 45 minutes, a...

Example Embodiment

[0027] Example 3

[0028] Take 300 g of rubber powder, soak it in 900 mL of 5% sodium hydroxide solution for 24 hours, filter to obtain a filter residue, add the filter residue to 900 mL of 20% hydrogen peroxide, and dropwise add 10% sulfuric acid to adjust the pH to 5, At 60 °C, the reaction was stirred at 400 r / min for 3 h, then urea was added to adjust the pH to 9, and heated to 90 °C, and the reaction was continued to stir for 2 h. The filter cake was filtered, washed with deionized water for 3 times, and then dried. In the box, dry at 110 °C to constant weight to obtain modified rubber powder, take 400g of ordinary Portland cement, 650g of fine aggregate, 1200g of coarse aggregate, 50g of modified rubber powder, 3g of basalt fiber, 150g of deionized water , put it into the mixer and mix it uniformly into a slurry, and then pour the slurry into the mold for molding. After demoulding, the surface is scraped, and watered for 50 minutes, and then naturally cured for 18 days t...

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Abstract

The invention relates to modified rubber concrete and a preparation method thereof, and belongs to the technical field of concrete processing. A sodium hydroxide solution is used to soak rubber powder, so that some auxiliaries in the rubber are converted into soluble sodium salts to remove, so that chemical impurities which prevent rubber from being combined with concrete are reduced; rubber powder is treated with hydrogen peroxide under a weakly acidic condition, so that nonpolar carbon-carbon double bonds on the surface of the rubber are greatly oxidized into carbonyl groups; under the weakly basic condition, the carbonyl groups and urea are subjected to addition condensation, imidogen, acylamino and the like are introduced into the rubber surface, the acylamino is a strongly polar hydrophilic group, the carbonyl group and N-H bonds on the acylamino can act with cemented products through relatively strong hydrogen bonds, so that interface adhesion strength of rubber concrete is strengthened; meanwhile, basalt fibers are coopered to achieve the bridging effect, so that a micro strain change value increase rate is slower, expansion of cracks is restrained very well, impact resistance is improved, low-temperature cracking property of concrete can be effectively improved, and mechanical property and breaking strength of concrete are strengthened.

Description

technical field [0001] The invention relates to a modified rubber concrete and a preparation method thereof, belonging to the technical field of concrete processing. Background technique [0002] Although concrete is still used in engineering as the main construction engineering material, engineering buildings are gradually developing towards high-rise, large-span and multi-functional, which puts forward more demands on the strength, stiffness, toughness and functionality of concrete materials. high demands. However, traditional concrete is not only difficult to meet various requirements at the same time, but also limits its application and development due to the contradiction between its high strengthening and high brittleness that is temporarily difficult to reconcile. Adding an appropriate amount of rubber particles to traditional concrete can better improve the brittleness of concrete, achieve an ideal balance between strength and toughness, and endow traditional concre...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/02C04B18/22
CPCY02W30/91
Inventor 汪逸凡王之霖陈倩
Owner 汪逸凡
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