Assessment of recycling process induced damage sensitivity of recycled concrete aggregates

S. Nagataki; A. Gokce; T. Saeki; M. Hisada

doi:10.1016/j.cemconres.2003.11.008

Assessment of recycling process induced damage sensitivity of recycled concrete aggregates

S. Nagataki, A. Gokce, T. Saeki, M. Hisada

ENG - Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

286 Citations (Scopus)

Abstract

This paper evaluates the complex nature of recycled concrete aggregates that are susceptible to damage due to recycling. The study was carried out by microstructural assessment techniques beyond the standard testing methods normally specified for aggregates. The laboratory produced recycled concrete aggregates were investigated using fluorescent microscopy and image analysis. Contrary to common opinion, microstructural studies showed that adhered mortar (AM) is not always the primary parameter determining the quality of the recycled coarse aggregate. Sandstone coarse aggregate originally had defects in the form of voids and cracks. Further processing of the recycled coarse aggregate changed the microstructural profile of the material and enhanced their properties. The unusual results of the performance tests carried out on the recycled aggregate concretes could be explained with the findings of microscopic level investigations.

Original language	English
Pages (from-to)	965-971
Number of pages	7
Journal	Cement and Concrete Research
Volume	34
Issue number	6
DOIs	https://doi.org/10.1016/j.cemconres.2003.11.008
Publication status	Published - 2004 Jun

Keywords

Damage sensitivity
Mechanical properties
Microcracking
Recycled coarse aggregate
Recycling process

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10.1016/j.cemconres.2003.11.008

Cite this

@article{7d697fb4cfb1421ebb6fbcf543e216ce,

title = "Assessment of recycling process induced damage sensitivity of recycled concrete aggregates",

abstract = "This paper evaluates the complex nature of recycled concrete aggregates that are susceptible to damage due to recycling. The study was carried out by microstructural assessment techniques beyond the standard testing methods normally specified for aggregates. The laboratory produced recycled concrete aggregates were investigated using fluorescent microscopy and image analysis. Contrary to common opinion, microstructural studies showed that adhered mortar (AM) is not always the primary parameter determining the quality of the recycled coarse aggregate. Sandstone coarse aggregate originally had defects in the form of voids and cracks. Further processing of the recycled coarse aggregate changed the microstructural profile of the material and enhanced their properties. The unusual results of the performance tests carried out on the recycled aggregate concretes could be explained with the findings of microscopic level investigations.",

keywords = "Damage sensitivity, Mechanical properties, Microcracking, Recycled coarse aggregate, Recycling process",

author = "S. Nagataki and A. Gokce and T. Saeki and M. Hisada",

note = "Funding Information: The study presented in this paper was a part of PhD research of the second author. The authors gratefully acknowledge Japan Society for the Promotion of Science (JSPS) for financially supporting this research as a part of a 5-year large-scale project entitled “Development of New Recycling Methods for Construction Materials in Consideration of Their Life Cycle,” Project No. 96 R 07601. The authors are also grateful to Professor Heikki Kukko, Technical Research Center of Finland, and Dr Hans S. Pietersen, Delft University of Technology, for supplying important documents including their distinguished studies on microscopy and image analysis. ",

year = "2004",

month = jun,

doi = "10.1016/j.cemconres.2003.11.008",

language = "English",

volume = "34",

pages = "965--971",

journal = "Cement and Concrete Research",

issn = "0008-8846",

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T1 - Assessment of recycling process induced damage sensitivity of recycled concrete aggregates

AU - Nagataki, S.

AU - Gokce, A.

AU - Saeki, T.

AU - Hisada, M.

N1 - Funding Information: The study presented in this paper was a part of PhD research of the second author. The authors gratefully acknowledge Japan Society for the Promotion of Science (JSPS) for financially supporting this research as a part of a 5-year large-scale project entitled “Development of New Recycling Methods for Construction Materials in Consideration of Their Life Cycle,” Project No. 96 R 07601. The authors are also grateful to Professor Heikki Kukko, Technical Research Center of Finland, and Dr Hans S. Pietersen, Delft University of Technology, for supplying important documents including their distinguished studies on microscopy and image analysis.

PY - 2004/6

Y1 - 2004/6

N2 - This paper evaluates the complex nature of recycled concrete aggregates that are susceptible to damage due to recycling. The study was carried out by microstructural assessment techniques beyond the standard testing methods normally specified for aggregates. The laboratory produced recycled concrete aggregates were investigated using fluorescent microscopy and image analysis. Contrary to common opinion, microstructural studies showed that adhered mortar (AM) is not always the primary parameter determining the quality of the recycled coarse aggregate. Sandstone coarse aggregate originally had defects in the form of voids and cracks. Further processing of the recycled coarse aggregate changed the microstructural profile of the material and enhanced their properties. The unusual results of the performance tests carried out on the recycled aggregate concretes could be explained with the findings of microscopic level investigations.

AB - This paper evaluates the complex nature of recycled concrete aggregates that are susceptible to damage due to recycling. The study was carried out by microstructural assessment techniques beyond the standard testing methods normally specified for aggregates. The laboratory produced recycled concrete aggregates were investigated using fluorescent microscopy and image analysis. Contrary to common opinion, microstructural studies showed that adhered mortar (AM) is not always the primary parameter determining the quality of the recycled coarse aggregate. Sandstone coarse aggregate originally had defects in the form of voids and cracks. Further processing of the recycled coarse aggregate changed the microstructural profile of the material and enhanced their properties. The unusual results of the performance tests carried out on the recycled aggregate concretes could be explained with the findings of microscopic level investigations.

KW - Damage sensitivity

KW - Mechanical properties

KW - Microcracking

KW - Recycled coarse aggregate

KW - Recycling process

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DO - 10.1016/j.cemconres.2003.11.008

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AN - SCOPUS:2142653216

SN - 0008-8846

VL - 34

SP - 965

EP - 971

JO - Cement and Concrete Research

JF - Cement and Concrete Research

IS - 6

ER -

Assessment of recycling process induced damage sensitivity of recycled concrete aggregates

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Keywords

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