Green high-strength and high-toughness concrete and preparation process thereof

A high-strength toughness, concrete technology, applied in the field of concrete, can solve problems such as easy to load a large amount of mortar, rough surface, and affect the strength of concrete, and achieve sustainable development, high mechanical strength, and improved density.

Active Publication Date: 2022-03-25
深圳市深建混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Recycled concrete is made of recycled aggregates, cement and other raw materials. Recycled aggregates are made from construction waste after crushing, cleaning, and grading. Using recycled aggregates as raw materials to prepare recycled concrete can realize the reuse of sand and gravel resources. Green and sustainable development; however, due to the rough surface of the waste concrete block, it is easy to load a large amount of mortar, and in the process of crushing, the concrete block is subjected to a large mechanical external force, which further increases the water absorption rate of the recycled aggregate, and the large water absorption rate is easy affect the strength of concrete

Method used

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  • Green high-strength and high-toughness concrete and preparation process thereof

Examples

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Effect test

preparation example 1

[0045] Preparation Example 1: Modified recycled aggregates are prepared by the following method:

[0046]Weigh waste concrete blocks and go through primary crushing, secondary crushing, cleaning, grading, and drying to obtain recycled aggregates. The recycled aggregates are composed of recycled crushed stone and recycled sand with a weight ratio of 2.8:1. The particle size of the recycled crushed stone is 5-10cm, mud content 0.3%, porosity 42%, crush index 8%, surface density 2510kg / m 3 ;Reclaimed sand fineness modulus 2.1, mud content 3%, porosity 42%, surface density 2460kg / m 3 ;

[0047] Weigh the regenerated aggregate and place it in a 0.5% sodium gluconate aqueous solution by mass fraction, the weight ratio of the regenerated aggregate to the sodium gluconate aqueous solution is 1:2.5, soak for 15min at a stirring speed of 300r / min, then take out the regenerated aggregate, drain Dry the surface moisture, and make semi-finished products after drying;

[0048] Put the se...

preparation example 2

[0049] Preparation example 2: The modified recycled aggregate is prepared by the following method:

[0050] The waste concrete blocks are weighed and subjected to primary crushing, secondary crushing, cleaning, grading, and drying to obtain recycled aggregates. The recycled aggregates are composed of recycled crushed stone and recycled sand with a weight ratio of 2:1. The particle size of the recycled crushed stone is 5-10cm, mud content 0.3%, porosity 42%, crush index 8%, surface density 2510kg / m 3 ;Reclaimed sand fineness modulus 2.1, mud content 3%, porosity 42%, surface density 2460kg / m 3 ;

[0051] Weigh the regenerated aggregate and place it in a 0.1% sodium gluconate aqueous solution by mass fraction, the weight ratio of the regenerated aggregate to the sodium gluconate aqueous solution is 1:2.5, soak for 15min at a stirring speed of 300r / min, then take out the regenerated aggregate, drain Dry the surface moisture, and make semi-finished products after drying;

[005...

preparation example 3

[0053] Preparation example 3: The modified recycled aggregate is prepared by the following method:

[0054] Weigh waste concrete blocks and go through primary crushing, secondary crushing, cleaning, grading, and drying to obtain recycled aggregates. The recycled aggregates are composed of recycled crushed stone and recycled sand with a weight ratio of 3.2:1. The particle size of the recycled crushed stone is 5-10cm, mud content 0.3%, porosity 42%, crush index 8%, surface density 2510kg / m 3 ;Reclaimed sand fineness modulus 2.1, mud content 3%, porosity 42%, surface density 2460kg / m 3 ;

[0055] Weigh the regenerated aggregate and place it in a 1% sodium gluconate aqueous solution by mass fraction, the weight ratio of the regenerated aggregate to the sodium gluconate aqueous solution is 1:2.5, soak for 15min at a stirring speed of 300r / min, then take out the regenerated aggregate, drain Dry the surface moisture, and make semi-finished products after drying;

[0056] Put the s...

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Abstract

The invention relates to the field of concrete, and particularly discloses green high-strength and high-toughness concrete and a preparation process thereof. The green high-strength and high-toughness concrete is prepared from the following raw materials in parts by weight: cement, fly ash, mineral powder, natural aggregate, modified regenerated aggregate, water, an additive and composite fibers, a preparation method of the modified regenerated aggregate comprises the following steps: weighing waste concrete blocks, pretreating to obtain regenerated aggregate, putting the regenerated aggregate into a sodium gluconate solution, stirring and soaking, then taking out the regenerated aggregate, and performing drying post-treatment to obtain the modified regenerated aggregate; the preparation method comprises the following steps: weighing the cement, the fly ash and the mineral powder, mixing and stirring to obtain a premix; weighing the natural aggregate, the modified regenerated aggregate and the composite fiber, stirring and mixing to obtain a mixture; weighing the water, the additive, the premix and the mixture, mixing and stirring to obtain a mixture, and pouring and curing to obtain the concrete, the concrete has the advantages of greenness, high strength and high toughness.

Description

technical field [0001] The application relates to the field of concrete, more specifically, it relates to a green high-strength toughness concrete and its preparation process. Background technique [0002] Green concrete is the inevitable product of the progress of material science and technology and the sustainable development of society. It is an advanced civil engineering material with environmental coordination and self-adaptive characteristics. It is generally divided into green high-performance concrete, recycled aggregate concrete, and environmentally friendly concrete. [0003] Recycled concrete is made of raw materials such as recycled aggregates and cement. Recycled aggregates are made from construction waste after crushing, cleaning, and grading. The preparation of recycled concrete with recycled aggregates as raw materials can realize the reuse of sand and gravel resources. Green and sustainable development; however, due to the rough surface of the waste concrete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B24/38C04B24/26C04B24/10C04B18/16C04B16/06C04B14/42C04B20/02C04B111/34
CPCC04B28/04C04B24/10C04B24/26C04B14/42C04B16/0683C04B18/16C04B24/38C04B20/023C04B2111/00017C04B2201/50C04B2111/343C04B18/08C04B14/02C04B14/06C04B2103/302Y02W30/91
Inventor 杨冬方耿通
Owner 深圳市深建混凝土有限公司
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