Preparation method for coal gangue aggregate no-sand porous plant-growing concrete

A technology of planting concrete and porous concrete, which is applied in the field of preparation of coal gangue aggregate sand-free porous planting concrete, can solve the problem that the comprehensive utilization rate is less than 10%, and achieve the effects of improving the alkali environment, wide sources, and simple production process

Inactive Publication Date: 2018-03-30
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most coal gangue in my country is stacked in the...

Method used

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  • Preparation method for coal gangue aggregate no-sand porous plant-growing concrete
  • Preparation method for coal gangue aggregate no-sand porous plant-growing concrete
  • Preparation method for coal gangue aggregate no-sand porous plant-growing concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The cement in this example is PO.42.5 ordinary portland cement produced in Fuxin. The main chemical composition and technical parameters of cement are shown in Table 1 and Table 2.

[0036] The main chemical composition (%) of table 1 cement

[0037]

[0038] Table 2 Main Technical Parameters of Cement

[0039]

[0040] Coarse aggregate is unburned coal gangue that has not been sorted for a long time. It is crushed by a crusher and then screened to form a continuously graded coarse aggregate with a particle size range of 4.75-31.5mm. The main chemical composition and basic physical and mechanical properties of unburned coal gangue are shown in Table 3 and Table 4 below.

[0041] The main chemical composition (%) of table 3 unburned coal gangue

[0042]

[0043] Table 4 Basic physical and mechanical properties of unburned coal gangue

[0044]

[0045] The external admixture is selected from Class 2 fly ash from Fuxin Power Plant. The main chemical compon...

Embodiment 2

[0061] The cement in this example is PO.42.5 ordinary portland cement produced in Fuxin. The main chemical composition and technical parameters of the cement are the same as in Example 1; the coarse aggregate is the unburned coal gangue that has not been sorted for a long time, which is crushed with a crusher, and then sieved to form a continuously graded coarse aggregate with a particle size range of 4.75-31.5mm. aggregate. The main chemical components and basic physical and mechanical properties of unburned coal gangue are the same as in Example 1;

[0062] The admixture is a naphthalene-based high-efficiency water reducer; ordinary tap water is used for mixing and curing of coal gangue aggregate sand-free porous plant-growing concrete.

[0063] The preparation method of coal gangue aggregate sand-free porous planting concrete is carried out according to the following steps:

[0064] (1) Crushing solid waste unburned coal gangue with a jaw crusher, and then sieving and dis...

Embodiment 3

[0075] The cement in this example is PO.42.5 ordinary portland cement produced in Fuxin. The main chemical composition and technical parameters of the cement are the same as in Example 1; the coarse aggregate is the unburned coal gangue that has not been sorted for a long time, which is crushed with a crusher, and then sieved to form a continuously graded coarse aggregate with a particle size range of 4.75-31.5mm. aggregate. The main chemical components and basic physical and mechanical properties of unburned coal gangue are the same as in Example 1;

[0076] The admixture is a naphthalene-based high-efficiency water reducer; ordinary tap water is used for mixing and curing of coal gangue aggregate sand-free porous plant-growing concrete.

[0077] The preparation method of coal gangue aggregate sand-free porous planting concrete is carried out according to the following steps:

[0078] (1) Crushing solid waste unburned coal gangue with a jaw crusher, and then sieving and dis...

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Abstract

The invention discloses a preparation method for coal gangue aggregate no-sand porous plant-growing concrete. The method comprises the following steps: taking coal gangue coarse aggregate as a skeleton structure, taking cement and fly ash as cementing materials, adding an admixture which is a water reducing agent, performing stirring step by step, performing vibration molding to obtain porous concrete, covering the concrete with a transparent plastic film, performing wet curing for 28 days, spraying an acetic acid aqueous solution at the surface of the porous concrete for alkali reducing treatment, detecting the pH value of the surface of the porous concrete, when the pH value is less than or equal to 9, stopping to spray the acetic acid aqueous solution, and performing natural drying to obtain the coal gangue aggregate no-sand porous plant-growing concrete. The concrete provided by the invention has the advantages of higher compressive strength, a large communicating porosity, good water permeability, and good air permeability; and the alkaline environment in gaps of the coal gangue aggregate no-sand porous plant-growing concrete after the pH value alkali reducing treatment is performed in a later period can be better improved to meet the environmental requirements of plant growth.

Description

technical field [0001] The invention relates to a method for preparing coal gangue aggregate sand-free porous planting concrete. Background technique [0002] Coal gangue comes from the industrial solid waste discharged during the mining of raw coal and coal washing, and its amount accounts for about 15%-30% of the raw coal mining volume. It is also the tailings solid waste with the largest discharge and storage volume in my country. According to incomplete statistics, the discharge of coal gangue in Fuxin area in northwestern Liaoning alone has reached 1.988 billion tons. At present, most of the coal gangue in my country is stacked in the open air, and the comprehensive utilization rate is less than 10%. How to effectively deal with the increasing coal gangue solid waste not only has important guiding significance for regional economic development, but also can protect the ecological environment, save energy and protect the environment from the long-term goal of sustainabl...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B28/04C04B28/08C04B40/04C04B111/40
CPCC04B28/021C04B28/04C04B28/08C04B40/04C04B2111/00112C04B2111/40C04B2201/50C04B22/002C04B18/12C04B18/08C04B2103/302
Inventor 崔正龙郭勇白淼
Owner LIAONING TECHNICAL UNIVERSITY
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