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Preparation method of modified corn straw fiber reinforced recycled concrete

A technology of corn stalk fiber and recycled concrete, which is applied in the field of building material preparation, can solve the problems of weak bonding between recycled aggregate and new mortar, limit the application and development of recycled aggregate, and poor strength of recycled aggregate, and solve the problem of bonding Low strength, good mechanical properties, enhanced strength effect

Inactive Publication Date: 2020-12-01
瑞普环保新材料(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Because of the old mortar on the surface of the recycled aggregate used in recycled concrete, it has high water absorption, large crushing value, and many cracks, resulting in weak bonding between the recycled aggregate and the new mortar, so the strength of the recycled aggregate is often poor. Limit the application and development of recycled aggregate

Method used

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  • Preparation method of modified corn straw fiber reinforced recycled concrete
  • Preparation method of modified corn straw fiber reinforced recycled concrete
  • Preparation method of modified corn straw fiber reinforced recycled concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of modified corn stalk fiber reinforced recycled concrete, the specific preparation scheme is as follows:

[0028] Add 48kg of river sand, 100kg of sealed and modified recycled coarse aggregate, 3.8kg of slag, 11kg of surface-modified corn stalk fiber and 5kg of steel slag into the mixing mixer, mix and stir for 10 minutes, then add 70kg of cement, 5kg of fly ash, 3kg of Add the perlite tailings sand into the mixer and mix evenly; then mix 45kg of water, 0.5kg of water reducer, 0.6kg of sodium thiosulfate, 0.1kg of polyvinyl alcohol, 1.2kg of glass fiber and 0.8kg of β-naphthalenesulfonic acid formaldehyde condensate After uniformity, add it into a mixer, mix and stir for 15 minutes, then pour the concrete into a mold, and after curing, the above-mentioned modified corn stalk fiber reinforced recycled concrete can be obtained.

[0029] The processing method of the regenerated coarse aggregate of described closure modification is:

[0030] Putting t...

Embodiment 2

[0038] A preparation method of modified corn stalk fiber reinforced recycled concrete, the specific preparation scheme is as follows:

[0039] Add 54kg of river sand, 110kg of closed modified recycled coarse aggregate, 4.6kg of slag, 14kg of surface-modified corn stalk fiber and 8kg of steel slag into the mixing mixer, mix and stir for 20min, and then add 78kg of cement, 8kg of fly ash, 5kg of Add the perlite tailings sand into the mixer and mix well; then mix 55kg of water, 0.7kg of water reducing agent, 0.8kg of sodium thiosulfate, 0.4kg of polyvinyl alcohol, 2.8kg of glass fiber and 1.2kg of β-naphthalenesulfonic acid formaldehyde condensate After being uniform, add it to a mixer, mix and stir for 20 minutes, then pour the concrete into a mold, and after curing, the above-mentioned modified corn stalk fiber reinforced recycled concrete can be obtained.

[0040] The processing method of the regenerated coarse aggregate of described closure modification is:

[0041] Put the ...

Embodiment 3

[0050] A preparation method of modified corn stalk fiber reinforced recycled concrete, the specific preparation scheme is as follows:

[0051] Add 62kg of river sand, 120kg of closed modified recycled coarse aggregate, 5.6kg of slag, 17kg of surface-modified corn stalk fiber and 11kg of steel slag into the mixing mixer, mix and stir for 30min, and then add 86kg of cement, 12kg of fly ash, 7kg of Add the perlite tailings sand into the mixer and mix well; then mix 62kg of water, 1.2kg of water reducer, 1.0kg of sodium thiosulfate, 0.8kg of polyvinyl alcohol, 4.1kg of glass fiber and 2.2kg of β-naphthalenesulfonic acid formaldehyde condensate After uniformity, add it into a mixer, mix and stir for 30 minutes, then pour the concrete into a mold, and after curing, the above-mentioned modified corn stalk fiber reinforced recycled concrete can be obtained.

[0052] The processing method of the regenerated coarse aggregate of described closure modification is:

[0053] Put the regene...

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Abstract

The invention relates to the field of preparation of building materials, in particular to a preparation method of modified corn straw fiber reinforced recycled concrete. According to the invention, corn straw fibers are used for reinforcing and modifying recycled concrete, and the hydrophilic modification of the corn straw fibers can effectively increase acting force between the corn straw fibersand the concrete, so the strength of the concrete is effectively improved; in addition, after the recycled coarse aggregate is modified with a closed modifier containing silica sol and calcium carbonate powder, pores and cracks in the surface of the recycled aggregate are filled, the effect of strengthening old mortar is achieved, the problems that the recycled aggregate is high in water absorption performance and low in bonding strength are solved, and the strength of the recycled concrete is further enhanced; the recycled concrete disclosed by the invention has very good mechanical properties through the synergistic enhancement effect of the modified recycled coarse aggregate and the modifying corn straw fibers; and the method is a promising method for recycling concrete construction waste.

Description

technical field [0001] The invention relates to the field of building material preparation, in particular to a preparation method of modified corn stalk fiber reinforced recycled concrete. Background technique [0002] In the past two decades, my country's construction industry has entered a stage of rapid development driven by urbanization and has become one of the pillar industries of the national economy. However, more and more construction wastes are produced at the same time. In my country, only a small part of waste concrete is used outside the base of roads and buildings, and most of it is directly transported to the suburbs or villages without any technical treatment, and is treated by landfill or open-air placement, which consumes a lot of requisitioned land. Fees, garbage removal and transportation fees and other construction expenses. With the development of high performance concrete, the high performance of recycled concrete has gradually attracted the attention ...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B20/10C04B20/02
CPCC04B20/023C04B20/1074C04B28/06C04B2201/50C04B7/02C04B14/068C04B18/16C04B18/141C04B18/248C04B18/142C04B18/08C04B18/12C04B2103/302C04B22/147C04B24/2623C04B14/42C04B24/226C04B20/107
Inventor 竺逸飞李伟志
Owner 瑞普环保新材料(广州)有限公司
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