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Development of laboratory equipment to obtain powdered concrete samples to determine chlorides concentration for durability studies

Development of laboratory equipment to obtain powdered concrete samples to determine chlorides... The determination of chloride concentration in reinforced concrete structures present in marine environment is an important tool in the context of their service life, allowing the development of models capable of estimating the beginning of the bars corrosive process and, at the same time, the reduction of the load bearing capacity of the reinforced concrete structure. In general, the methods for collection of powder concrete samples from real structures are based on the execution of holes with a drill or from the direct grinding of the concrete surface, however, there is the possibility of contamination of samples between the execution of successive continuity of the holes. Thus, another possible method deals with the extraction of concrete cores from the structures and subsequent sectioning in the laboratory. At this point, sectioning procedures not allowing the grinding of layers smaller than 0.5 cm, and still may cause material loss due the rotation speed of the cutting discs. In this way, this work presents an equipment developed, for academic purposes, with the objective to perform the grinding of concrete layers with thickness of 2 mm, at an affordable cost, to obtain powder concrete samples in order to determine chlorides. The results showed that the equipment meets technical and economic aspects successfully and can be used in several world laboratories. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Building Pathology and Rehabilitation Springer Journals

Development of laboratory equipment to obtain powdered concrete samples to determine chlorides concentration for durability studies

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References (24)

Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer International Publishing AG, part of Springer Nature
Subject
Engineering; Building Repair and Maintenance; Structural Materials; Engineering Thermodynamics, Heat and Mass Transfer; Energy Efficiency; Building Materials
ISSN
2365-3159
eISSN
2365-3167
DOI
10.1007/s41024-018-0034-4
Publisher site
See Article on Publisher Site

Abstract

The determination of chloride concentration in reinforced concrete structures present in marine environment is an important tool in the context of their service life, allowing the development of models capable of estimating the beginning of the bars corrosive process and, at the same time, the reduction of the load bearing capacity of the reinforced concrete structure. In general, the methods for collection of powder concrete samples from real structures are based on the execution of holes with a drill or from the direct grinding of the concrete surface, however, there is the possibility of contamination of samples between the execution of successive continuity of the holes. Thus, another possible method deals with the extraction of concrete cores from the structures and subsequent sectioning in the laboratory. At this point, sectioning procedures not allowing the grinding of layers smaller than 0.5 cm, and still may cause material loss due the rotation speed of the cutting discs. In this way, this work presents an equipment developed, for academic purposes, with the objective to perform the grinding of concrete layers with thickness of 2 mm, at an affordable cost, to obtain powder concrete samples in order to determine chlorides. The results showed that the equipment meets technical and economic aspects successfully and can be used in several world laboratories.

Journal

Journal of Building Pathology and Rehabilitation – Springer Journals

Published: Apr 11, 2018

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