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Recycled concrete and production technology thereof

A technology for recycled concrete and waste concrete, applied in the field of construction engineering, can solve problems such as affecting the performance of recycled concrete and large porosity of recycled aggregate, and achieve the effects of saving cement and fine aggregate, good slump and reducing porosity

Inactive Publication Date: 2019-08-09
四川衡鼎建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: the recycled coarse aggregate is subjected to a large external force during the crushing process, and a large number of fine cracks will appear inside, resulting in a large porosity of the recycled aggregate, which makes the water absorption of the recycled aggregate and The water absorption rate is much higher than that of natural aggregates, which affects the performance of recycled concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0051] The preparation of modified coarse aggregate is as follows:

[0052] Waste and old concrete is crushed, screened, and the particles with an average particle diameter of 16mm are selected, (the average particle diameter produced during the collection of crushed stones is a small particle of 0.25mm, standby);

[0053] Wash the particles with an average particle size of 16mm (collect the small particles precipitated in the water during cleaning, and set aside), air-dry until no water drips, and obtain the recycled coarse aggregate; the recycled coarse aggregate with an average particle diameter of 16mm is made into 5mm continuous particle size gradation and 16mm single particle size gradation combined recycled coarse aggregate finished product; 5.67kg nanomaterials and 2.83kg silica sol were evenly mixed to make a mixed solution; 50kg recycled coarse aggregate finished product and mixed solution were mixed in Stir at 60°C for 50 minutes and dry to obtain modified recycled ...

preparation example 2

[0057] The preparation of modified coarse aggregate is as follows:

[0058] Waste and old concrete is crushed, screened, and the particles with an average particle diameter of 31.5mm are selected, (the average particle diameter produced during the collection of broken stones is a small particle of 0.35mm, standby);

[0059] The particles with an average particle diameter of 31.5mm are cleaned (the small particles precipitated in the water are collected during cleaning, for subsequent use), air-dried until no water drips, and the recycled coarse aggregate is obtained; the average particle diameter is the recycled coarse aggregate of 31.5mm, Made 16mm continuous particle size gradation and 31.5mm single particle size gradation combined recycled coarse aggregate finished product; 8.57kg nano material and 3.43kg silica sol were evenly mixed to make a mixed solution; 50kg recycled coarse aggregate finished product was mixed with The mixture was stirred at 70°C for 70 minutes, and d...

preparation example 3

[0063] The preparation of modified coarse aggregate is as follows:

[0064] Waste and old concrete is crushed, screened, and the particles with an average particle diameter of 19mm are selected, (the average particle diameter produced during the collection of broken stones is a small particle of 0.5mm, standby); the particles with an average particle diameter of 19mm are cleaned (Collect the small particles 2 precipitated in the water during cleaning, and set aside), dry in the air until no water drips, and obtain the recycled coarse aggregate; mix 7.5kg of nanomaterials with 2.5kg of silica sol evenly to obtain a mixed solution; prepare the finished recycled coarse aggregate Stir with the mixed solution at 65°C for 60 minutes and dry to obtain the modified recycled coarse aggregate.

[0065] The recycled fine aggregate was prepared as follows:

[0066]Wash the spare small particles prepared during the preparation of the modified coarse aggregate, remove the cement and dust i...

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PUM

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Abstract

The invention discloses a recycled concrete and a production technology thereof. The recycled concrete is prepared from, by weight, 100-112 parts of coarse aggregates, 68-75 parts of fine aggregates,27-33 parts of cement, 15-22 parts of a mineral admixture, 5-10 parts of fibers, 3-8 parts of rubber particles, 13-19 parts of water and 0.6-1.0 part of an admixture; the coarse aggregates include modified recycled coarse aggregates and ordinary coarse aggregates, and the recycled coarse aggregates are obtained by modifying waste concrete particles with a nano-material and silica sol as modifiers;and the fine aggregates include recycled fine aggregates and ordinary fine aggregates. The production technology improves the compressive strength, the flexural strength and the drying shrinkage of concrete, and improves the flexural property, the impermeability, the corrosion resistance, the impact resistance and the wear resistance of concrete. The preparation method of the recycled concrete includes the following steps: detection, metering, mixing, stirring and curing. The preparation method of the invention has the advantages of simple production process, safety in operation, and easinessin implementation.

Description

technical field [0001] The invention relates to the technical field of construction engineering, more specifically, it relates to a recycled concrete and its production process. Background technique [0002] Concrete refers to the artificial stone made of cement as the main cementitious material, mixed with water, sand and stones, chemical admixtures and mineral admixtures when necessary, mixed in an appropriate proportion, uniformly stirred, densely formed and cured . Recycled concrete refers to the waste concrete blocks that are crushed, cleaned, and graded, mixed with gradation in a certain proportion, partially or completely replaced by natural aggregates such as sand and gravel (mainly coarse aggregates), and then added with cement, water, etc. new concrete. Recycled concrete can have the following situations according to the combination of aggregates: all aggregates are recycled aggregates; coarse aggregates are recycled aggregates, fine aggregates are natural sand; ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B20/02
CPCC04B20/023C04B28/00C04B2111/00017C04B2201/50C04B18/16C04B18/08C04B14/28C04B16/0683C04B18/22C04B2103/22C04B14/48C04B2103/302
Inventor 向嵘杨小兵罗斌
Owner 四川衡鼎建材有限公司
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