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A design method of cement-stabilized iron-like tailings sand base material

A technology for stabilizing iron tailings sand and cement, which is applied in the field of road engineering materials, can solve problems such as the inability to meet the design of cement-stabilized iron tailings sand base materials, and achieves great social significance, huge economic benefits, and the effect of improving the status quo of accumulation.

Active Publication Date: 2021-01-22
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional cement-stabilized base material design method cannot satisfy the design of cement-stabilized iron tailings sand base material because iron tailings sand is too fine compared to natural stone chips, and proposes a cement-stabilized iron tailings sand base material design method. Design method of mineral sand base material

Method used

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  • A design method of cement-stabilized iron-like tailings sand base material
  • A design method of cement-stabilized iron-like tailings sand base material
  • A design method of cement-stabilized iron-like tailings sand base material

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Experimental program
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Effect test

specific Embodiment approach 1

[0024] Embodiment one: a kind of cement-stabilized iron tailings sand base material design method comprises the following steps:

[0025] Step 1: Determine the scope of use of the design parameters, the design parameters being iron tailings fineness modulus X 1 , iron tailings sand consumption X 2 And the amount of cement binder X 3 ;

[0026] Step 2: According to the scope of use of the design parameters determined in step 1, use the star-point design method to design the test, and measure the 7-day unconfined compressive strength R of each group of tests in the star-point design test table;

[0027] Step 3: According to the 7-day unconfined compressive strength R of each group of tests in the star point design test table measured in step 2, perform multiple nonlinear regression analysis to obtain a ternary quadratic fitting equation;

[0028] Step 4: Use the ternary quadratic fitting equation obtained in Step 3 as a prediction model to obtain the effect surface diagram, o...

specific Embodiment approach 2

[0036] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the scope of use of the design parameters determined in the step one is specifically:

[0037] Select the fineness modulus of iron tailings sand, the amount of iron tailings sand and the amount of cement binder as the three key investigation factors in the design of the base, and determine the reasonable range of values ​​for the above three factors according to the pre-test and the characteristics of the material itself. Set the fineness modulus of iron tailings sand as 0.7 to 1.9, and set the fineness modulus of iron tailings sand as X 1 , The amount of iron tailings used in the base layer is set at 5% to 30%, and the amount of iron tailings is set to X 2 , The amount of cement binder is set at 2% to 8%, and the amount of cement binder is set to X 3 .

[0038] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0039] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in the described step two, according to the range of use of the design parameters determined in step one, adopt the star point design method to design the test, measure the star point design test table The specific process of the 7-day unconfined compressive strength R of each group of tests is:

[0040] For iron tailings sand fineness modulus X 1 , iron tailings sand consumption X 2 , the amount of cement binder X 3 Three influencing factors are used to transform the value of the code factor of the star point design, and the value of the influencing factor is converted in proportion to the difference of the code. Here is the three-factor star point design. The value point α is 1.732(3 1 / 2 ), the specific results are shown in Table 1;

[0041] Table 1 Factor code levels and values

[0042]

[0043] According to the values ​​of the three factors, design the th...

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Abstract

The invention provides a design method of a cement stabilized iron tailing sand base course material and relates to a design method of a base course material, aiming at solving the problem that a traditional design method of the cement stabilized iron tailing sand base course material cannot meet the design of the cement stabilized iron tailing sand base course material. The design method comprises the following steps: 1: determining an utilization range of deign parameters; 2: measuring 7-day unconfined compressive strength of each group of test in a central composite design test table; 3: obtaining a ternary quadratic fitting equation; 4: obtaining optimal ranges of fineness modulus of iron tailing sand, utilization amount of the iron tailing sand and utilization amount of a cement binding material; 5: selecting three stone material gradations through single-gear gradation adjustment; 6: selecting a maximal stone material gradation with the 7-day unconfined compressive strength as anoptimal gradation; 7: measuring the optimal moisture content and the maximum dry density of a standard compaction test part under different cement utilization amounts; 8: determining an optimal cement utilization amount; 9: preparing a test part and carrying out freezing resistance identification on the test part. The design method provided by the invention is used for the technical field of roadengineering materials.

Description

technical field [0001] The invention relates to the technical field of road engineering materials, in particular to a design method for cement-stabilized iron-like tailings sand base material. Background technique [0002] Iron tailings is a kind of tailings waste with stable fineness modulus and meeting the requirements of fine sand or ultra-fine sand, which is produced after iron ore is purified, ground, and iron ore selected. Most of its components are solid stone powder particles, and has good thermal stability. However, the increasing number of abandoned tailings has caused a series of social and environmental problems. Due to the reduction of the adsorption force between tailings sand particles, flow and slump damage are prone to occur during the accumulation process. For example, in 2000, the tailings pond of Guangxi Nandan Hongtu concentrator collapsed and caused dozens of casualties, resulting in extremely bad conditions. social influence. Various chemicals used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00198C04B2111/0075C04B2201/50C04B18/12C04B14/02
Inventor 徐慧宁刘凯迪崔洪海谭忆秋姜伟强李凤尊王汀王宇于铁军李扬林玉翔
Owner HARBIN INST OF TECH
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