Modified high carbon ferro-chrome slag aggregate for road concrete and preparation method of modified high carbon ferro-chrome slag aggregate

A high-carbon ferrochromium, concrete technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem that no high-carbon ferrochromium slag aggregate has been effectively used in road concrete, concrete and workability. It can reduce the problems of aggregate crushing value and poor volume stability of concrete, so as to achieve the effect of reducing poor volume stability, reducing interfacial tension and surface free energy, and improving applicability and safety.

Active Publication Date: 2014-06-18
李素娥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, ferrochrome slag has a high content of magnesium oxide (25%-40% by mass of MgO), which may cause poor volume stability of concrete after being eroded by a complex external environment for a long time, which has become a major hidden concern affecting the safety of concrete structures
At the same time, the surface of carbon-chromium slag is rough, and the porous (non-penetrating) characteristics increase its total specific surface area, resulting in a significant increase in the water absorption rate of the aggregate and the probability of primary defects such as micro-cracks, which leads to concrete under the same mix ratio. The workability and aggregate crushing value are significantly reduced, and at the same time, the aggregate surface is more likely to produce a gradient distribution of structure and components, which will aggravate the weakening effect of the interface transition zone (ITZ) on the overall performance of concrete
In the prior art, there have been no literature reports on the effective use of high-carbon ferrochrome slag aggregates in road concrete

Method used

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  • Modified high carbon ferro-chrome slag aggregate for road concrete and preparation method of modified high carbon ferro-chrome slag aggregate
  • Modified high carbon ferro-chrome slag aggregate for road concrete and preparation method of modified high carbon ferro-chrome slag aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The ferrochromium slag and basalt are crushed, shaped and screened, and the gradation is manually adjusted according to the proportion. Spray the modifier evenly on the surface of the aggregate. The dosage of the modifier is 3.4% of the aggregate mass until the surface is wet, and then send it to the finished product stack for 1 day before use. At the same time, it should be sprayed evenly. Using these two aggregates to mix concrete, the mixing mass ratio is cementitious material (cement, P.O42.5R, the same below): water: coarse aggregate: fine aggregate = 1: 0.6: 2.5: 1.83.

[0035] The preparation process of the modifier is as follows: firstly, the original emulsion of butadiene and styrene emulsion (45% by mass) is heated to 45°C, and tap water is added to dilute to 8% by mass, and then the admixtures and The ratio is: silicone defoamer 0.6% (based on 8% original emulsion, the same below), polyvinyl alcohol powder 0.3%, zeolite powder 3%, fully stirred and cooled to ...

Embodiment 2

[0038] Proceed as described in Example 1; except:

[0039] Its mixing ratio is cementitious material (cement: fly ash): water: coarse aggregate: fine aggregate = 1 (7.5: 2.5): 0.35: 2.1: 1.83.

[0040] After forming and curing and testing the mechanical properties of different ages, the 3d, 28d and 56d flexural / compressive strengths of the modified ferrochromium slag aggregate concrete are 7.5MPa / 46.4MPa, 8.2MPa / 63.7MPa and 9.8MPa respectively / 78.4MPa; the 3d, 28d and 56d folds / strengths of untreated carbon-chromium slag aggregate concrete are 5.8MPa / 44.9MPa and 7.6MPa / 61.5MPa and 8.3MPa / 78.2MPa, respectively.

Embodiment 3

[0042] Preparation of different grades of ordinary concrete:

[0043] The implementation process is carried out according to Example 1, and the modified carbon-chromium slag aggregate is obtained, wherein the fine aggregate modulus is 2.3, and the coarse aggregate is a continuous gradation of 5mm to 31.5mm, and its quality conforms to GBT14685-2011 "Construction Crusher". Stone and Pebble" and GB14684-2011 "Sand for Construction". Using this coarse and fine aggregate to mix concrete of different strength grades, the mixing ratio is cementitious material: water: coarse aggregate: fine aggregate = 1: (0.3, 0.4, 0.5, 0.6): 2.5: 1.83, of which 0.3 water The ash ratio is added with a polycarboxylic acid-based high-efficiency surfactant with a mass percentage of 0.3% of the cementitious material.

[0044] After forming, curing and testing, the 3d strength of the mixed concrete is 50.1MPa, 38.3MPa, 33.6MPa and 12.7MPa, the 28d strength is 64.8MPa, 48.1MPa, 40.4MPa and 22.3MPa, and t...

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Abstract

The invention discloses a modified high carbon ferro-chrome slag aggregate for road concrete and a preparation method of the modified high carbon ferro-chrome slag aggregate. The modified high carbon ferro-chrome slag aggregate is characterized by being prepared from a high carbon ferro-chrome alloy slag aggregate and a chemical modifying agent accounting for 2-6 percent of the mass of the high carbon ferro-chrome alloy slag aggregate through mixing, wherein the chemical modifying agent is prepared from 100 parts by mass of polymer diluting solution, 0.5-1.2 parts by mass of organic silicon waterproof defoaming agent, 0.2-0.5 part by mass of polyvinyl alcohol and 2-4 parts by mass of zeolite powder through uniform mixing; the polymer diluting solution is prepared by diluting a polymer emulsion stock solution through adding water; and the polymer emulsion stock solution is any one of a butylbenzene emulsion, a polyacrylate emulsion, a polyethylene-vinyl acetate emulsion and a styrene-acrylic emulsion. By adopting the invention, waste alloy waste is used as a raw material, and thus building materials of carbon chromic slag can be recycled and efficiently utilized, and the defects and the hidden dangers of the carbon chromic slag as the concrete aggregate are solved; and the preparation method is simple and easy to realize and is strong in practicability.

Description

technical field [0001] The invention belongs to the utilization of solid waste-industrial waste residue, and relates to a modified high-carbon ferrochromium slag aggregate for road concrete and a preparation method thereof. The modified high-carbon ferrochromium slag aggregate obtained by the invention is especially suitable for road concrete, and also suitable for concrete of various common construction and civil engineering. Background technique [0002] In the prior art, there are few types of concrete aggregates suitable for road engineering, and natural high-quality basalt and limestone are generally used. As natural aggregate is a non-renewable resource, the decline in raw material reserves and the continuous increase in demand will inevitably bring about contradictions between supply and demand, especially for high-performance aggregates. Therefore, it is necessary to find new concrete aggregates through appropriate theoretical innovations and technical means, and to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/14
CPCY02W30/91
Inventor 李素娥刘来宝
Owner 李素娥
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