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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

A high-carbon ferrochrome and concrete technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem that the high-carbon ferrochrome slag aggregate has not been effectively used in road concrete, concrete workability and aggregate crushing value decrease, poor concrete volume stability and other problems, to achieve the effect of reducing poor volume stability, reducing interfacial tension and surface free energy, and improving applicability and safety

Active Publication Date: 2013-05-01
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 ferrochrome slag and basalt are crushed, shaped and screened, and the gradation is manually adjusted according to the proportion. The quality meets the requirements of GBT14685-2011 "Gravel and Pebble for Construction" and GB14684-2011 "Sand for Construction". Spray the modifier evenly on the surface of the aggregate. The dosage of the modifier is 3.4% of the mass of the aggregate. Just make the surface wet. Send it to the finished product stack for 1 day before use. At the same time, ensure that the spraying is uniform. The concrete is mixed with these two aggregates, and the 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: first, heat the original emulsion of butadiene and styrene emulsion (45% by mass) to 45°C, add tap water to dilute to 8% by mass, and then add the additives and The ratio is: 0.6% silicone defoamer (bas...

Embodiment 2

[0038] Carry out as described in Example 1; The difference is:

[0039] The mix 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 ferrochrome slag aggregate concrete are 7.5MPa / 46.4MPa, 8.2MPa / 63.7MPa and 9.8MPa respectively / 78.4MPa; the 3d, 28d and 56d fold / strength of untreated carbon-chromium slag aggregate concrete are 5.8MPa / 44.9MPa, 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 has a modulus of 2.3, and the coarse aggregate has a continuous gradation of 5 mm to 31.5 mm, and its quality is in compliance with GBT14685-2011 "Construction Crushed Stones, Pebbles" and GB14684-2011 "Sand for Construction". Use this coarse and fine aggregate to mix concrete with different strength grades, and the mix 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 gray ratio is added with 0.3% polycarboxylate high-efficiency surfactant of gelling material mass percentage.

[0044] After molding, curing and testing, the 3d strength of the mixed concrete is 50.1MPa, 38.3MPa, 33.6MPa and 12.7MPa, the 28-day strength is 64.8MPa, 48.1MPa, 40.4MPa and 22.3 MPa, and the 60d st...

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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 solid waste—utilization of industrial waste residue, and relates to a modified high-carbon ferrochrome slag aggregate used for road concrete and a preparation method thereof. The modified high-carbon ferrochrome slag aggregate obtained by the invention is especially suitable for road concrete, and is also suitable for concrete of various common building 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. Since natural aggregate is a non-renewable resource, the decline in its raw material reserves and the continuous increase in demand will inevitably lead to a contradiction between supply and demand, especially for high-performance aggregates. Therefore, it is very necessary to find new concrete aggregates through appropriate theoretical innovation and technical means, and to...

Claims

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Application Information

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