Green iron tailing concrete with high carbonization resistance and preparation method thereof

A technology for concrete and iron tailings, applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc. The effect of improved carbonization resistance, high economic value, and improved compactness

Pending Publication Date: 2022-06-03
HEBEI AGRICULTURAL UNIV.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to provide a green iron tailings concrete with high carbonation resistance of strength grades C30 and C40, which not only effectively reduces the occurrence of building damage caused by the low carbonation resistance of concrete , and iron tailings are selected as concrete admixtures and coarse and fine aggregates. While achieving high carbonation resistance of concrete, iron tailings are fully utilized to solve the reduction of available land and surrounding environmental pollution caused by the accumulation of iron tailings. And other issues;

Method used

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  • Green iron tailing concrete with high carbonization resistance and preparation method thereof
  • Green iron tailing concrete with high carbonization resistance and preparation method thereof
  • Green iron tailing concrete with high carbonization resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The high carbonation resistance green iron tailings concrete described in this embodiment, the raw materials for each cubic meter of concrete include: cement 290kg, iron tailing powder 124kg, iron tailing sand 785kg, iron tailing ore 1084kg, water reducer 2.07kg, water 170kg . Among the above-mentioned raw materials, cement and iron tailings powder as admixtures form a gel material (total 414kg), and each raw material is fully mixed and stirred to obtain the desired concrete.

[0034] After testing, the strength grade of the concrete is C30, and the replacement ratio of iron tailings powder to cement is 30%.

Embodiment 2

[0036] The green iron tailings concrete with high carbonation resistance described in this example, the raw materials for each cubic meter of concrete include: cement 361kg, iron tailing powder 155kg, iron tailing sand 746kg, iron tailing ore 1030kg, water reducing agent 2.58kg, water 170kg . Among the above-mentioned raw materials, cement and iron tailings powder as admixtures form a gel material (total 516kg), and each raw material is fully mixed and stirred to obtain the desired concrete.

[0037] After testing, the strength grade of the concrete is C40, and the replacement ratio of iron tailings powder to cement is 30%.

experiment example

[0047] According to the rapid carbonation test regulations in GB / T 50082-2009 "Standards for Long-term Performance and Durability of Ordinary Concrete", the concrete prepared according to the plans of Example 1-2 and Comparative Example 1-4 was made into several 100mm×100mm× 400mm prismatic test block, after standard curing for 28d in an environment with a relative temperature of 20±2°C and a relative humidity of not less than 95%, it is continuously dried for 48h in a constant temperature drying oven at 60°C, and then the surface of the test block is smeared with paraffin and placed in Rapid carbonization box, the temperature in the carbonization box is 20±2℃, the relative humidity is 70±5℃, CO 2 The concentration is 20±3%; after the specified age (3d, 7d, 14d, 28d), the test block is taken out, and its carbonization depth is measured. The test results are as follows in Table 1 and attached. Figure 1-2 shown.

[0048] Table 1 Carbonization test results

[0049]

[0050...

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Abstract

The invention belongs to the technical field of civil engineering construction building materials, particularly relates to high-carbonization-resistance green iron tailing concrete and further discloses a preparation method of the high-carbonization-resistance green iron tailing concrete. According to the green iron tailing concrete with high carbonization resistance, the iron tailing powder is used as an admixture to partially replace cement to form a cementing material, and the iron tailing sand and the iron tailing ore are respectively used as a fine aggregate and a coarse aggregate, so that the strength performance of the prepared concrete material meets the standard, and the carbonization resistance is improved; in the whole concrete material, the utilization rate of the iron tailing waste can reach about 90%, the utilization rate of the iron tailing waste is greatly improved, and the process advantage of being green and environmentally friendly is achieved.

Description

technical field [0001] The invention belongs to the technical field of building materials for civil engineering construction, in particular to a green iron tailings concrete with high carbonization resistance, and further discloses a preparation method thereof. Background technique [0002] As a widely used material in the construction field, the durability of concrete has always been the key performance. Among the many factors affecting the durability of concrete, the anti-carbonation performance is one of the most important indicators. Under normal circumstances, the concrete after pouring and curing will form a structure with micro-cracks and pores inside, and carbon dioxide in the air can easily penetrate into the concrete through these cracks and pores, causing the concrete to carbonize, and then As a result, the alkalinity of the concrete is reduced, the protection of the internal steel bars is lost, and the steel bars are corroded. In construction or road engineering...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/12C04B111/22
CPCC04B28/04C04B18/12C04B2111/0075C04B2111/22C04B2103/302Y02W30/91
Inventor 张若兰孙建恒杨明镜马馨鑫孟志良王军林姚志玉丁丽芳
Owner HEBEI AGRICULTURAL UNIV.
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