A method for recovering the strength of calcined concrete

A technology for concrete strength and waste concrete, which is used in the field of restoring the strength of concrete after calcination

Active Publication Date: 2020-11-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It has been disclosed in the prior art that adding basalt fiber to recycled concrete can improve its high temperature resistance and freeze-thaw performance, but the upper limit of its high temperature resistance is only about 400 degrees, and it is aimed at low- and medium-strength concrete. For high-strength concrete Basalt fiber recycled concrete is not involved

Method used

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  • A method for recovering the strength of calcined concrete
  • A method for recovering the strength of calcined concrete
  • A method for recovering the strength of calcined concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) After crushing waste concrete or construction waste, sieve to obtain recycled coarse aggregate with a particle size of 2.36 mm;

[0026] 2) After washing the regenerated coarse aggregate obtained in step 1) with water, soak it in water for 24 hours;

[0027] 3) After mixing sand, cement and fly ash, mix them with basalt fiber in batches to obtain Mixture I, then add coarse aggregate and water to Mixture I, and after fully stirring, pour concrete ;

[0028] The doping amount of the basalt fiber is 0.5kg / m 3 ;

[0029] The amount of water, cement, fly ash, water reducer, sand and coarse aggregate is 5.15 parts by weight of water, 13.72 parts of cement, 3.43 parts of fly ash, 0.0515 parts of water reducer, and 21.35 parts of sand. and 43.4 parts of coarse aggregate;

[0030] The coarse aggregate is composed of natural coarse aggregate and recycled coarse aggregate;

[0031] 4) The concrete in step 3) is cured for the first time at 17°C and the relative humidity is ...

Embodiment 2

[0033] 1) After crushing waste concrete or construction waste, sieve to obtain recycled coarse aggregate with a particle size of 10mm;

[0034] 2) After washing the regenerated coarse aggregate obtained in step 1) with water, soak it in water for 48 hours;

[0035] 3) After mixing sand, cement and fly ash, mix them with basalt fiber in batches to obtain Mixture I, then add coarse aggregate and water to Mixture I, and after fully stirring, pour concrete ;

[0036] The doping amount of the basalt fiber is 4kg / m 3 ;

[0037] The amount of water, cement, fly ash, water reducing agent, sand and coarse aggregate is 5.4 parts by weight of water, 14.56 parts of cement, 3.64 parts of fly ash, 0.0546 parts of water reducing agent, and 21.7 parts of sand and 44.1 parts of coarse aggregate;

[0038] The coarse aggregate is composed of natural coarse aggregate and recycled coarse aggregate;

[0039] 4) The concrete in step 3) is cured for the first time under the conditions of 20°C an...

Embodiment 3

[0041] 1) After crushing waste concrete or construction waste, sieve to obtain recycled coarse aggregate with a particle size of 19mm;

[0042] 2) After washing the regenerated coarse aggregate obtained in step 1) with water, soak it in water for 72 hours;

[0043] 3) After mixing sand, cement and fly ash, mix them with basalt fiber in batches to obtain Mixture I, then add coarse aggregate and water to Mixture I, and after fully stirring, pour concrete ;

[0044] The mixing amount of the basalt fiber is 5kg / m 3 ;

[0045]The amount of water, cement, fly ash, water reducing agent, sand and coarse aggregate is 5.4 parts by weight of water, 14.56 parts of cement, 3.64 parts of fly ash, 0.0546 parts of water reducing agent, and 21.7 parts of sand and 44.1 parts of coarse aggregate;

[0046] The coarse aggregate is composed of natural coarse aggregate and recycled coarse aggregate;

[0047] 4) The concrete in step 3) is cured for the first time at 23°C and the relative humidit...

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Abstract

The invention discloses a method for restoring the strength of calcined concrete, a method for improving the durability of high-strength recycled concrete under high temperature (up to 800 degrees) and extreme freeze-thaw environments (up to 100 freeze-thaw cycles), mainly through Incorporation of basalt fibers and post-curing methods achieved. Incorporating basalt fibers in concrete helps to improve the freeze-thaw resistance, impermeability, and high temperature resistance of concrete, and can inhibit the environmental damage of concrete and the initiation and expansion of cracks under external forces. When the fiber content is 4kg / m 3 The strength of recycled concrete develops the fastest and is stable, and the strength is high after 28 days. The mass loss of fiber recycled concrete does not exceed 1% after 100 times of freezing and thawing. The strength of concrete recovers after high temperature loss, and when the high temperature is less than 600°C, the strength can recover to the same level.

Description

technical field [0001] The invention belongs to the field of strengthening treatment of recycled concrete, and in particular relates to a method for restoring the strength of calcined concrete. Background technique [0002] Recycled concrete means that waste concrete blocks are crushed, cleaned and graded, mixed with gradation in a certain proportion, partially or completely replaced by natural aggregates (mainly coarse aggregates) such as sand and gravel, and then added with cement, water, etc. new concrete. Basalt fiber is a continuous fiber made of natural basalt ore melted at 1450-1500°C and drawn at high speed through a platinum-rhodium alloy drawing bushing. It has various excellent properties such as electrical insulation, corrosion resistance, and high temperature resistance. It can effectively Strengthening the ability of concrete to resist crack initiation and expansion is listed as one of the four major fibers for key development in my country. [0003] It has be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B40/02C04B111/20
CPCC04B28/02C04B2111/20C04B2201/50C04B18/08C04B18/16C04B14/06C04B2103/302C04B14/02C04B40/0281C04B40/0286C04B40/0263C04B14/46
Inventor 董江峰袁书成贾璞王清远
Owner SICHUAN UNIV
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