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Preparation and Performance Investigation of Iron Containing Aggregate and Its Cement-based Conductive Composites

Author: DengXiao
Tutor: HeYongJia
School: Wuhan University of Technology
Course: Materials Science
Keywords: Iron powder Conductive aggregate Carbon fiber reinforced concrete Conductivity Pressure sensitive
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 1
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Abstract

Conductive concrete is a the conductivity, alertness special performance concrete, the use of force sensitive performance, electric performance and electromagnetic properties, health monitoring and evaluation in the civil engineering structures, airports and roads snowmelt deicing, heating indoor heated important facilities electromagnetic shielding has broad application prospects. Papers relying National Natural Science Fund project, conductive concrete internal set of materials such as carbon fiber conductive phase existence of the barrier effect and impact of continuous, complete conductive network formation problem, carry out the preparation of the iron-doped conductive features aggregate cement-based composite conductive material of and Performance. Research work in this paper and the results obtained are: clay matrix, iron powder as conductive filler, powder preparation, dry pressing and calcining process, prepared by the excellent performance of iron-based conductive functional aggregate. By different proportions and calcined under the conditions set before and after the material was calcined volume shrinkage ratio changes and the apparent density change to determine a reasonable sintering temperature range and the blending ratio of the different conductive phase component aggregates. Doped iron conductive function aggregate the physical and mechanical characteristics and electrical properties were studied and found that the iron powder particle size as well as the dosage has a significant effect on the electrical properties and mechanical properties of conductive aggregates. As the iron powder particle size decreases, the electrical conductivity and mechanical properties of the conductive aggregate significantly improved; iron powder particle diameter was 150 μm, 48μm, 6μm, 3μm, the percolation threshold of the conductive aggregate current of more than 18.01%, respectively, 18.01 %, 11.03%, 9.82% volume content. Fired doped iron powder conductive feature set and the combination of carbon fiber as a conductive phase, preparation of the composite conductive cement-based materials; comparative study of the electrical conductivity and ordinary clay aggregate carbon fiber reinforced concrete and carbon fiber grout test block. Found that the incorporation of iron-doped conductive aggregate can significantly reduce the concrete resistivity shorten resistivity stability to the time required to analyze the reasons to think that the conductive functional aggregate to form a more perfect conductive network of carbon fiber reinforced concrete. Through the one-way uniform loading experiments, the feature set of iron-doped conductive material - carbon fiber composite conductive pressure-sensitive performance of cement-based materials, increased with the dosage in the range of carbon fiber percolation, pressure sensitive; When the carbon fiber content must , incorporation of the conductive aggregates make specimens improved sensitivity into ordinary aggregate specimens sensitivity decreased, indicating that iron-doped conductive functional aggregates help to improve the resistance of the cement-based material varistor.

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