CS30 spraying steel fiber concrete prepared from ferrous mill tailings

A technology of steel fiber concrete and iron tailings, which is applied in the field of construction engineering to achieve the effects of improving toughness, saving safety maintenance costs, and reducing over-exploitation

Inactive Publication Date: 2017-10-10
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, there is no report of CS30 iron

Method used

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  • CS30 spraying steel fiber concrete prepared from ferrous mill tailings
  • CS30 spraying steel fiber concrete prepared from ferrous mill tailings
  • CS30 spraying steel fiber concrete prepared from ferrous mill tailings

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Experimental program
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Embodiment Construction

[0019] The present invention will be further described below in conjunction with embodiment.

[0020] CS30 sprayed steel fiber concrete prepared with iron tailings is made of ordinary Portland cement, silica fume, fly ash, gravel, iron tailings, steel fibers, water reducer and water in a certain proportion. The preparation method adopts the wet spraying preparation process, the method: crushed stone + sand + cement + silicon powder + 75% water - mixing for not less than 30 seconds - water reducing agent + 25% water - mixing time for not less than 30 seconds. In addition, the accelerator is mixed with the mixture at the nozzle.

[0021] Preparation utilizes the CS30 sprayed steel fiber concrete component of iron tailing sand preparation to have weight percent as follows:

[0022]

[0023]

[0024] Performance comparison of CS30 iron tailing sand sprayed steel fiber concrete and C30 common river sand steel fiber sprayed concrete

[0025]

[0026]

[0027] Note: Co...

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Abstract

The invention relates to a CS30 spraying steel fiber concrete prepared from ferrous mill tailings. The CS30 spraying steel fiber concrete is prepared from the following components in percentage by weight: 12 to 14% of cement, 1.5 to 2.0% of silica powder, 3 to 4% of fly ash, 28 to 35% of crushed stone, 35 to 42% of ferrous mill tailings, 1.2 to 2% of steel fiber, 7.5 to 8.5% of water, 0.18 to 0.25% of polycarboxylate superplasticizer, and 1.3 to 1.8% of accelerator. The CS30 spraying steel fiber concrete has the advantages that the ferrous mill tailings are used for completely replacing natural river sand, so that the excessive production of natural river sand is effectively decreased; according to the land advantages of the iron ore producing area, the mine wastes of ferrous mill tailings and the like are furthest consumed; because the steel fiber is adopted, the tensile strength, breaking strength and adhesion force of the concrete are obviously improved, and the structure toughness is also greatly improved.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, in particular to a CS30 sprayed steel fiber concrete prepared from iron tailing sand. Background technique [0002] C30 shotcrete is mainly used in the disposal of tunnels, mine roadways and road slope protection surfaces after excavation. Because the tensile strength of plain concrete itself is relatively low, generally a steel wire mesh is fixed on the surface before spraying C30 concrete, and then sprayed with 50mm-100mm C30 concrete for temporary reinforcement to completely cover the excavated surface to ensure that no soil and gravel will occur Wait for the fall, and then proceed to the next step of permanent reinforcement. However, due to the relatively fine holes of the steel wire mesh, it is easy to cause the lining to be voided, and at the same time, there is a potential safety hazard due to the need for manual hanging of the mesh before the shotcrete. [0003] Iron ta...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/146C04B18/08C04B18/12C04B14/48C04B14/02C04B2103/302C04B2103/12
Inventor 邓鹏宏周仁杰刘显峰尹华光张文吴东鲁丽华姚大力
Owner ANSTEEL GRP MINING CO LTD
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