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Method for preparing recycled aggregate pervious concrete by using aqueous capillary crystalline solution

A permeable concrete and recycled aggregate technology, applied in the field of concrete, can solve the problems of low concrete strength, poor water permeability, and small porosity, and achieve the effects of increasing compactness and compressive strength, increasing cohesion, and reducing water absorption

Pending Publication Date: 2021-12-21
CHINA RAILWAY 15TH CONSTR BUREAU GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, when using recycled aggregates to prepare permeable concrete, the traditional grouting method is often used to optimize the surface of recycled aggregates, or to strengthen with organic polymers to increase the interfacial bonding force between aggregates, but the strength of the recycled aggregate permeable concrete produced is low, poor water permeability
It is difficult to improve the performance of recycled aggregate permeable concrete by relying on a specific single aggregate reinforcement method. The concrete strength is low, the porosity is small, the water permeability is poor, and the durability cannot meet the standards.

Method used

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  • Method for preparing recycled aggregate pervious concrete by using aqueous capillary crystalline solution

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Embodiment 1

[0026] Example 1: This example relates to a method for preparing recycled aggregate permeable concrete using an aqueous osmotic crystallization solution, such as figure 1 As shown, the mass ratio of raw materials of recycled aggregate permeable concrete in experimental group 1 is: 100 parts of cement, 18 parts of admixture, 414 parts of recycled aggregate, 35.4 parts of water, 0.74 parts of naphthalene-based water reducer, EVA (ethylene -vinyl acetatecopolymer, ethylene-vinyl acetate copolymer) emulsion 2.23 parts, its method comprises the following steps:

[0027] Step (1): Soak the air-dried recycled aggregate in the water-based osmotic crystallization solution, filter after soaking for 3 hours, take it out and place it on a plastic plate in the curing room for 1 day. Among them, the recycled aggregate is the aggregate with a particle size range of 4.75-26.5mm after the waste concrete is crushed, sieved and washed with water; the stacked porosity of the recycled aggregate is...

Embodiment 2

[0031] Embodiment 2: This embodiment relates to a method for preparing recycled aggregate permeable concrete using an aqueous osmotic crystallization solution, such as figure 1 As shown, the mass ratio of raw materials for recycled aggregate permeable concrete in experimental group 2 is: 100 parts of cement, 22 parts of admixture, 483 parts of recycled aggregate, 36.6 parts of water, 1.22 parts of naphthalene-based water reducer, and 3.69 parts of EVA emulsion The method includes the following steps:

[0032]Step (1): Soak the air-dried recycled aggregate in the water-based osmotic crystallization solution, filter after soaking for 3 hours, take it out and place it on a plastic plate in the curing room for 1 day. Among them, the recycled aggregate is the aggregate with a particle size range of 4.75-26.5mm after the waste concrete has been crushed, sieved and washed with water; the water-based osmotic crystallization solution is composed of 100% sodium silicate, catalysts and a...

Embodiment 3

[0036] Embodiment 3: This embodiment relates to a method for preparing recycled aggregate permeable concrete using an aqueous osmotic crystallization solution, such as figure 1 As shown, the mass ratio of raw materials for recycled aggregate permeable concrete in experimental group 3 is: 100 parts of cement, 19 parts of admixture, 425 parts of recycled aggregate, 35.9 parts of water, 0.82 parts of naphthalene-based superplasticizer, and 2.03 parts of EVA emulsion The method includes the following steps:

[0037] Step (1): Soak the air-dried recycled aggregate in the water-based osmotic crystallization solution, filter after soaking for 3 hours, take it out and place it on a plastic plate in the curing room for 1 day. Among them, the recycled aggregate is the aggregate with a particle size range of 4.75-26.5mm after the waste concrete has been crushed, sieved and washed with water; the water-based osmotic crystallization solution is composed of 100% sodium silicate, catalysts a...

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Abstract

The invention discloses a method for preparing recycled aggregate pervious concrete by using an aqueous capillary crystalline solution, which comprises the following steps: soaking 414-683 parts by mass of air-dried recycled aggregate in an aqueous capillary crystalline solution, conducting filtering, taking out the treated aggregate, and conducting drying; carrying out carbonization treatment on the dried recycled aggregate; and mixing and stirring the carbonized recycled aggregate with 35.4 to 36.6 parts by mass of water, 18 to 22 parts by mass of an admixture, 100 parts by mass of cement, 0.74 to 1.22 parts by mass of a water reducing agent and 2.23 to 3.69 parts by mass of an EVA (Ethylene Vinyl Acetate) emulsion, so as to obtain the recycled aggregate pervious concrete. The recycled aggregate pervious concrete has the advantages that the recycled aggregate pervious concrete subjected to double aggregate reinforcement and EVA modification is light in weight, green, environment-friendly and excellent in performance in all aspects.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a method for preparing recycled aggregate permeable concrete by utilizing an aqueous osmotic crystallization solution. Background technique [0002] With the acceleration of urbanization and industrialization, urban and industrial construction continues to deepen. On the one hand, the renewal of real estate construction has resulted in the generation of a large amount of construction waste, which seriously damages the ecological environment; on the other hand, urban roads are often made of water-blocking materials, and the ground is full of water, and the groundwater is in short supply, which is not conducive to the growth of plants and the heat in the air. and moisture circulation. Permeable concrete is an environmentally friendly ecological concrete, which can effectively protect water resources, relieve drainage pressure, reduce the urban heat island effect, and is conducive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/10
CPCC04B28/04C04B20/1074C04B2201/50C04B2111/00284C04B18/16C04B18/08C04B18/12C04B2103/302C04B24/2623C04B20/026C04B20/023
Inventor 孙丹丹黄昌富曹振杰林伟群邢如祥
Owner CHINA RAILWAY 15TH CONSTR BUREAU GRP
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