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Steel slag-based pervious concrete

A technology for permeable concrete and steel slag, applied in the field of building materials, can solve the problems of reducing the preparation cost, small volume deformation, etc., and achieves the effects of simple operation and overcoming low strength

Inactive Publication Date: 2020-12-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a steel slag-based permeable concrete, whose composition and parts by weight are 100 parts of steel slag, 15-30 parts of phosphate, 1-5 parts of retarder, and 50-5 parts of steel slag aggregate. 150 parts; when in use, the concrete material is stirred and mixed with water evenly, formed, and then naturally cured. The permeable concrete prepared by the method of the present invention is a kind of inorganic glue with steel slag-based phosphate cement as the main bonding phase, and steel slag raw material as aggregate. Concrete material, with high early strength, fast low-temperature coagulation speed, small volume deformation, wide environmental adaptability, good water permeability and other excellent properties; using industrial waste slag and steel slag as raw materials to prepare permeable concrete not only reduces the cost of material preparation, but overcomes the traditional permeable Concrete has the disadvantage of low strength, and at the same time can achieve energy saving and emission reduction. The invention contributes to the development of new environmentally friendly permeable concrete, and provides a new way for the efficient resource utilization of steel slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Bengang slag-based permeable concrete is composed of 100 parts of steel slag, 25 parts of sodium dihydrogen phosphate, 3 parts of borax, and 100 parts of steel slag aggregate; steel slag is powder that has been ground and passed through a 120-mesh sieve, and the sieve residue is less than 5% , Steel slag aggregate is a material with a particle size of 2.5-5.0mm obtained by crushing and sieving steel slag;

[0016] (2) Weigh the mixed material in step (1), add 36.5 parts of water, mix and stir for 3 minutes, quickly pour it into a 40mm×40mm×40mm six-unit mold, and form it by vibration molding method to obtain a steel slag-based permeable concrete sample; After 3 hours of molding, the sample was removed from the mold, and its compressive strength and water permeability were tested by natural curing until a certain age; the 3d compressive strength of the sample was 14.6MPa, and the water permeability coefficient was 5.71mm / s.

Embodiment 2

[0018] (1) Benxi steel slag-based permeable concrete is composed of 100 parts of steel slag, 30 parts of ammonium dihydrogen phosphate, 5 parts of borax, and 150 parts of steel slag aggregate; steel slag is powder that has been ground and passed through a 120-mesh sieve, and the sieve residue is less than 5% , Steel slag aggregate is a material with a particle size of 2.5-5.0mm obtained by crushing and sieving steel slag;

[0019] (2) Weigh the mixed material in step (1), add 45.6 parts of water, mix and stir for 3 minutes, quickly pour it into a 40mm×40mm×40mm six-unit mold, and form it by vibration molding method to obtain a steel slag-based permeable concrete sample; The sample was demolded after 3 hours of molding, and was cured by natural curing method to a certain age to test its compressive strength and water permeability; the 3d compressive strength of the sample was 16.7MPa, and the water permeability coefficient was 6.80mm / s.

Embodiment 3

[0021] (1) Bengang slag-based permeable concrete is composed of 100 parts of steel slag, 25 parts of potassium dihydrogen phosphate, 1 part of borax, and 100 parts of steel slag aggregate; steel slag is powder that has been ground and passed through a 120-mesh sieve with a sieve residue of less than 5%. , Steel slag aggregate is a material with a particle size of 2.5-5.0mm obtained by crushing and sieving steel slag;

[0022] (2) Weigh the mixed material in step (1), add 36.2 parts of water, mix and stir for 3 minutes, quickly pour it into a 40mm×40mm×40mm six-unit mold, and form it by vibration molding method to obtain a steel slag-based permeable concrete sample; After 3 hours of molding, the sample was removed from the mold, and its compressive strength and water permeability were tested by natural curing until a certain age; the 3d compressive strength of the sample was 13.4MPa, and the water permeability coefficient was 5.83mm / s.

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Abstract

The invention discloses a steel slag-based pervious concrete. The concrete comprises, by weight, 100 parts of steel slag, 15-30 parts of phosphate, 1-5 parts of a retarder and 50-150 parts of steel slag aggregate. When in use, the concrete materials are uniformly stirred and mixed with water, the obtained mixture is formed and naturally cured. The concrete has the excellent properties of high early strength, high low-temperature setting speed, small volume deformation, wide environmental adaptability, good water permeability and the like; and the defect that traditional pervious concrete is low in strength is overcome, meanwhile, a large amount of waste steel slag can be effectively treated, energy conservation, consumption reduction and emission reduction are achieved, and certain environmental protection and economic benefits are achieved.

Description

technical field [0001] The invention relates to a steel slag-based permeable concrete, which belongs to the technical field of building materials. Background technique [0002] Steel slag is the main solid waste of the iron and steel industry, which is produced in large quantities every year and should be regarded as a green resource. According to data from China's National Bureau of Statistics, China's crude steel output in 2019 was 996.3 million tons, and steel slag output exceeded 100 million tons. In China, the annual output of steel slag is huge, but the recovery rate is less than 30%. The reasons for the low utilization rate of steel slag mainly include outdated treatment methods, limited utilization rate for road construction and legal restrictions on application to agriculture. The low utilization rate causes steel slag to be piled up in large quantities, occupying a large amount of land and farmland, and polluting the environment. Moreover, the alkaline leaching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34C04B18/14
CPCC04B28/344C04B18/142C04B2111/00284C04B2201/50C04B22/0013Y02W30/91
Inventor 马越罗中秋周新涛母维宏王路星邵周军
Owner KUNMING UNIV OF SCI & TECH
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