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High-strength recycled concrete and preparation method thereof

A recycled concrete, high-strength technology, applied in the field of concrete production, can solve problems such as cracks, limit the use range of recycled concrete, and low mechanical properties of recycled concrete, achieve the effect of reducing the number of gaps, improving synergistic effects, and increasing the use range

Active Publication Date: 2022-01-14
开平达宇管桩混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current processing steps of recycled concrete generally include crushing, cleaning, and grading. Among them, when the discarded concrete blocks are broken, it is easy to cause cracks in the original aggregate, resulting in lower mechanical properties of the subsequently prepared recycled concrete. Therefore, most of the current recycled concrete is used in non-structural and non-load-bearing concrete fields such as backfill and roadbed, which limits the scope of use of recycled concrete.

Method used

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  • High-strength recycled concrete and preparation method thereof
  • High-strength recycled concrete and preparation method thereof
  • High-strength recycled concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0051] A high-strength recycled concrete prepared by the following steps:

[0052] Step 1: Stir calcium sulfate whiskers and coumarone resin in proportion for 15 minutes at a rotational speed of 220 r / min, and mix them uniformly to obtain a reinforcing agent;

[0053]Step 2: Stir the reinforcing agent, naphthalene-based water reducer, cement, recycled coarse aggregate and recycled fine aggregate for 1.5 hours at a speed of 90 r / min in proportion, and mix well to obtain a mixture A;

[0054] Step 3: Stir the mixture A, water, sand and fly ash in proportion for 0.5h at a speed of 130r / min, and mix evenly to obtain high-strength recycled concrete.

Embodiment 4

[0056] The difference from Example 3 is that the weight ratio of the naphthalene-based water-reducer to the reinforcing agent in Example 4 is 1:4, wherein the added amount of the naphthalene-based water-reduced agent is 1 kg, and the added amount of the reinforcing agent is 4 kg.

Embodiment 5

[0058] The difference from Example 3 is that the weight ratio of the naphthalene-based water-reducer to the reinforcing agent in Example 5 is 1:6, wherein the added amount of the naphthalene-based water-reduced agent is 1 kg, and the added amount of the reinforcing agent is 6 kg.

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Abstract

The invention relates to the field of concrete production, in particular to high-strength recycled concrete and a preparation method thereof. The high-strength recycled concrete comprises cement, water, fly ash, sand, recycled aggregate, a naphthalene water reducer and a reinforcing agent. The preparation method comprises the following steps: firstly, uniformly mixing calcium sulfate whiskers and coumarone resin in proportion to obtain the reinforcing agent, then uniformly mixing the reinforcing agent, the naphthalene water reducer, the cement and the recycled aggregate in proportion to obtain a mixture A, and finally uniformly mixing the mixture A, the water, the sand and the fly ash in proportion to obtain the high-strength recycled concrete. The high-strength recycled concrete has the effect of expanding the application range of the recycled concrete.

Description

technical field [0001] This application relates to the field of concrete production, more specifically, it relates to a high-strength recycled concrete and its preparation method. Background technique [0002] Concrete is referred to as "concrete" for short: it refers to the collective name of engineering composite materials that cement aggregates into a whole by cementing materials. The term concrete usually refers to cement as cementing material and sand and stone as aggregates; Water is mixed in a certain proportion, and the cement concrete obtained by stirring is widely used in civil engineering. [0003] With the gradual enhancement of people's awareness of environmental protection, more and more civil engineering has been applied to recycled concrete for construction. Recycled concrete refers to waste concrete blocks that go through a series of processing steps, and then mix them with gradation in a certain proportion, partially or completely replace natural aggregate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/38C04B24/00C04B24/28C04B103/30
CPCC04B28/04C04B24/00C04B14/383C04B24/28C04B2103/302C04B2201/50C04B2201/20C04B18/08C04B14/06C04B18/04
Inventor 李剑锋张秀匀张卓艺
Owner 开平达宇管桩混凝土有限公司
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