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Method utilizing tailing sand to carry out sand gradation improvement

A technology of tailings sand and grading is applied in the field of sand grading improvement and sand grading improvement by using tailings sand, which can solve the problems of polluting the environment and the land occupied by tailings, achieve good construction performance, reduce environmental damage, reduce The effect of production costs

Inactive Publication Date: 2015-01-07
SHANDONG JIANZE CONCRETE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of tailings will occupy land and pollute the environment

Method used

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  • Method utilizing tailing sand to carry out sand gradation improvement
  • Method utilizing tailing sand to carry out sand gradation improvement
  • Method utilizing tailing sand to carry out sand gradation improvement

Examples

Experimental program
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Embodiment 2

[0028] In Example 2, a is 0.5, b is 0.5, a+b=1, and the fineness modulus of the mixed sand is 2.7, between 2.3 and 3.0. The mixed sand of Example 2 uses the above 50 % Iron tailing sand and 50% river sand and machine-made sand need to be fully mixed.

Embodiment 3

[0029] In Example 3, a is 0.2, b is 0.8, a+b=1, and the fineness modulus of the mixed sand is 2.8, between 2.3 and 3.0. The mixed sand of Example 3 uses the above 20 % Gold mine tailings sand and 80% river sand are fully mixed.

[0030] For the main parameters of the mixed sand in Examples 1-3, see Table 2

[0031]

[0032] The main parameters of mixed sand are tested using JGJ52-2006 "Standard for Quality and Inspection Methods of Sand and Stone for Common Concrete".

[0033] The ready-mixed concrete prepared by using the mixed sand of the above Examples 1-3, the main data is shown in Table 3

[0034] table 3

[0035]

[0036] According to specific embodiments, the working performance, mechanical performance, and durability of the ready-mixed concrete disclosed in the present invention are tested. The test method of work performance is tested in accordance with GB / T50080-2002 "Standard for Test Methods for the Performance of Ordinary Concrete Mixtures", and the testing index requirem...

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Abstract

The invention discloses a method utilizing tailing sand to carry out sand gradation improvement, and belongs to the field of construction material preparation. The method comprises the following steps: (1) screening the tailing sand, and calculating the fineness modulus; (2) screening the sand needed to be improved, and calculating the fineness modulus; (3) mixing the tailing sand and the sand needed to be improved according to a ratio of a to b, and then screening the mixed sand; (4) determining the mixed sand. The method has the advantages that ore tailing wastes are utilized and high quality premixed concrete is obtained at the same time. The invention provides a method utilizing tailing sand to carry out sand gradation improvement. In the method, the tailing sand is mixed with sand needed to be improved according to a certain ratio, the tailing sand with low fineness modulus is used to modify the sand with high fineness modulus, thus the gradation of the obtained mixed sand meets the requirements of II zone middle sand, and the premixed concrete made of the improved mixed sand is accord withrelated criteria.

Description

[0001] Technical field [0002] The invention relates to a method for improving sand gradation, belonging to the field of building material preparation, in particular to a method for improving sand grading by using tailing sand. Background technique [0003] With the development of national infrastructure construction, the consumption of concrete continues to increase. The consumption of sand, which is one of the important raw materials for concrete, is constantly increasing. In this process, high-quality natural sand is consumed in large quantities, so that high-quality natural sand is either expensive or difficult to obtain. For this reason, various ready-mixed concrete companies began to seek ordinary quality natural sand or machine-made sand, and these natural sand or machine-made sand generally have a higher fineness modulus, resulting in a higher sand rate of concrete produced using these sands, which not only increases the concrete Production costs also increase the risk ...

Claims

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Application Information

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IPC IPC(8): C04B14/06
Inventor 王龙志张海霞崔鑫张雪
Owner SHANDONG JIANZE CONCRETE
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