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Slurry-coated reinforced permeable recycled concrete and preparation method thereof

A technology of recycled concrete and wrapping, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low strength, easy cracking and durability of recycled concrete, difficult to popularize and apply, and achieves low cost and high efficiency. performance, and the effect that is beneficial to industrial production and promotion

Pending Publication Date: 2021-10-12
CHINA CONSTR SEVENTH ENG DIVISION CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Concrete is one of the indispensable materials in today's construction industry. Waste concrete is piled up in the open air, occupying cultivated land, polluting the environment, and causing many safety hazards.
[0003] Due to the low strength of recycled concrete, large drying shrinkage, easy cracking and poor durability, it is difficult to popularize and apply

Method used

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  • Slurry-coated reinforced permeable recycled concrete and preparation method thereof

Examples

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preparation example Construction

[0033] The preparation method of the mud-wrapped reinforced permeable recycled concrete of the present invention comprises the following steps:

[0034]Step 1: Strengthen the recycled aggregate by using a slurry composed of cement and silica fume: the strengthening method includes three steps. The first step is to wash the recycled aggregate and sieve it after natural drying. 5 ~ 10mm and 10 ~ 20mm for classification; the second step is to wrap the recycled aggregate obtained in the first step with cement slurry, and first stir the cement slurry with a water-to-binder ratio of 0.5. The cementitious material in the cement slurry contains cement and Silica fume, wherein silica fume is 0.05% of the cementitious material, is then cut according to the ratio of recycled aggregate to cement slurry at 3:1, and stirred for 3 minutes; the third step is to place the removed cement-coated recycled aggregate in Vibrate on the vibrating table for 60s, and then evenly spread it on the wire m...

Embodiment 1

[0040] Mud wrapped reinforced permeable recycled concrete, calculated by mass per unit volume, includes the following raw materials: recycled coarse aggregate 960kg / m3 (after mud wrapped and strengthened), cement 350kg / m3, fly ash 120kg / m3, water 140kg / m3, water The rubber ratio is 0.30; the dosage of the water reducing agent is 0.8% of the gelling material, and the dosage of the thickener is 0.25% of the gelling material.

[0041] The production steps of mud-wrapped reinforced permeable recycled concrete are as follows:

[0042] First, rinse the recycled aggregate, sieve after natural drying, and classify according to the aggregate particle size of 5-10mm and 10-20mm; wrap the recycled aggregate obtained in the first step with cement paste, and first stir out the water Cement slurry with a glue ratio of 0.5, the cementitious material in the cement slurry contains cement and silica fume, wherein the silica fume is 0.05% of the cementitious material, and then it is mixed accord...

Embodiment 2

[0047] A kind of mud-wrapped reinforced permeable recycled concrete, including the following raw materials in terms of mass per unit volume: 1050kg / m3 of recycled coarse aggregate (after mud-wrapped and strengthened), 370kg / m3 of cement, 100kg / m3 of fly ash, and 136kg / m3 of water , the water-binder ratio is 0.29; the dosage of the water reducing agent is 0.75% of the gelling material, and the dosage of the thickener is 0.23% of the gelling material.

[0048] The preparation method of the mud-wrapped reinforced permeable recycled concrete is the same as in Example 1. The mud-wrapped reinforced permeable recycled concrete prepared in Example 2 has a compressive strength of 35.8 MPa, a flexural strength of 4.2 MPa, and a water permeability coefficient of 2.0 mm / s.

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Abstract

The invention relates to slurry-coated reinforced permeable recycled concrete and a preparation method thereof, and relates to the technical field of building material concrete. The slurry-coated reinforced permeable recycled concrete comprises the following raw materials in terms of mass per unit volume: 325-375 kg / m < 3 > of cement, 100-150 kg / m < 3 > of fly ash, 600-700 kg / m < 3 > of reinforced recycled coarse aggregate with a particle size of 10-20 mm, and 300-350 kg / m < 3 > of reinforced recycled coarse aggregate with a particle size of 5-10 mm; a water-binder ratio of the concrete is 0.28-0.32; the mixing amount of a water reducing agent is 0.7-0.9% of that of a cementing material, and the mixing amount of a thickening agent is 0.23-0.27% of that of the cementing material; the cement and the fly ash are both cementing materials. The preparation method of the slurry-coated reinforced permeable recycled concrete comprises the following steps of: step 1, reinforcing recycled aggregate by using slurry consisting of cement and silica fume; step 2, weighing raw materials; step 3, stirring and mixing the raw materials; and step 4, preparing and curing the slurry-coated reinforced permeable recycled concrete. According to the slurry-coated reinforced permeable recycled concrete and the preparation method thereof, the performance of the permeable recycled concrete can be improved, pollution to the natural environment is reduced, and the construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of building material concrete, in particular to a mud-wrapped reinforced permeable recycled concrete and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry, the annual construction waste generated nationwide is increasing year by year, among which waste concrete accounts for a huge proportion. Concrete is one of the indispensable materials in the construction industry today. Waste concrete is piled up in the open air, occupying cultivated land, polluting the environment, and causing many safety hazards. [0003] Due to the low strength of recycled concrete, large drying shrinkage, easy cracking and poor durability, it is difficult to popularize and apply. Reinforcement of recycled aggregates, and the engineering application of permeable recycled concrete, introduces the concept of sponge city into construction projects, which is conducive to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/10C04B18/16
CPCC04B28/04C04B20/1077C04B18/16C04B2201/50C04B2111/00284C04B2111/00017C04B18/08C04B2103/302C04B2103/44C04B20/1055Y02W30/91
Inventor 代峻峰崔永伟何海英李合清孙维东苏凯王国梁许纪平
Owner CHINA CONSTR SEVENTH ENG DIVISION CORP LTD
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