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Iron tailings roller compacted concrete for pavement

A technology of roller compacted concrete and iron tailings, applied in the field of concrete materials, can solve the problems of high silica content and achieve the effects of fine particle size, low price and wide sources

Inactive Publication Date: 2015-04-22
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Anshan-style iron tailings have the characteristics of simple mineral composition, high silica content, and finer particle size. Sieve, use the coarser part of the sieve, the finer part of the sieve cannot be used

Method used

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  • Iron tailings roller compacted concrete for pavement
  • Iron tailings roller compacted concrete for pavement
  • Iron tailings roller compacted concrete for pavement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using PO42.5 Portland cement, the ratio of each raw material is:

[0023] Water cement ratio raw material water cement Admixture Anshan type iron tailings aggregate Superplasticizer 0.38 Kg / m 3 152 275 333 392 1030 0.55

[0024] Mix well and put it into the test mold. After the mold is installed, place it on the upper surface of the vibration table and apply 300Kg / m 2 The pressure is formed by the pressure vibration method; after forming, it is kept under standard maintenance conditions, and the technical indicators of the corresponding age are as follows:

[0025]

Embodiment 2

[0027] Using PO52.5 Portland cement, the ratio of each raw material is:

[0028] Water cement ratio raw material water cement Admixture Iron tailings Anshan type aggregate Superplasticizer 0.38 Kg / m 3 152 275 298 405 1052 0.55

[0029] Mix well and put it into the test mold. After the mold is installed, place it on the upper surface of the vibration table and apply 300Kg / m 2 The pressure is formed by the pressure vibration method; after forming, it is kept under standard maintenance conditions, and the technical indicators of the corresponding age are as follows:

[0030]

Embodiment 3

[0032] Using PO52.5 Portland cement, the ratio of each raw material is:

[0033] Water cement ratio raw material water cement Admixture Anshan type iron tailings aggregate Superplasticizer 0.40 Kg / m 3 160 225 405 392 1000 0.55

[0034] Mix well and put it into the test mold. After the mold is installed, place it on the upper surface of the vibration table and apply 300Kg / m 2 The pressure is formed by the pressure vibration method; after forming, it is kept under standard maintenance conditions, and the technical indicators of the corresponding age are as follows:

[0035]

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Abstract

The present invention relates to iron tailings roller compacted concrete for pavement. The iron tailings roller compacted concrete is characterized in that the iron tailings roller compacted concrete is prepared from 218-327 Kg / m<3> of a silicate cement, 283-436 Kg / m<3> of an admixture, 349-436 Kg / m<3> of iron tailings, 873-1091 Kg / m<3> of an aggregate, 0.44-0.88 Kg / m<3> of an additive and 150-174 Kg / m<3> of water, wherein the admixture is a mixture of iron tailings, blast furnace slag and fly ash, the aggregate is formed by crushing iron mine waste rock, and the additive is a polycarboxylic acid water reducing agent. According to the present invention, the iron tailings roller compacted concrete of the present invention is mixed and is loaded into a mold, and then is placed onto the upper surface of the vibrating table, and 300 Kg / m<2> of the pressure is applied, the pressing-vibrating method is utilized to mold, and the flexural strength after 28 days achieves more than or equal to 5.7 MPa.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, in particular to an iron tailings roller compacted concrete for pavement. Background technique [0002] Roller compacted concrete is a dry hard cement-poor concrete, which is made of dry hard concrete without slump by mixing Portland cement, pozzolanic admixtures, water, admixtures, sand and grading-controlled coarse aggregate. Use the same transportation and paving equipment as for earth-rock dam construction, and use vibrating rollers for layer compaction. RCC was first used in dam construction in the 1970s. At present, the highest and largest RCC dam in the world is the Longtan RCC dam in my country, with a dam height of 217m and a total cubic volume of RCC of 750. Wanli. Roller compacted concrete dams not only have the characteristics of small concrete volume, high strength, good anti-seepage performance, and the overflow of the dam body, but also have the advantages of simple, fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/12
CPCY02W30/91
Inventor 陈宇周惠文刘雁翎纪新关革
Owner ANSTEEL GRP MINING CO LTD
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