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The effect of fine crushed concrete aggregate on the durability of structural concrete

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conference contribution
posted on 08.02.2017, 12:10 by Wayne Dodds, Chris GoodierChris Goodier, Simon Austin, Christian Christodoulou, D. Dunne, Matthew Chan
The specification of crushed concrete aggregates (CCA) is increasing, particularly for low-grade applications, where quality is of less importance. In higher value applications, such as structural concrete, further research is required to understand the effect of CCAs on mechanical and durability performance. One disadvantage of using CCA is that the fine material (0-4mm) is often removed, which is not efficient. This research investigated the effect of fine CCA and its combination with coarse CCA in PC/GGBS structural concretes. The resistance to water and chloride ingress in terms of surface resistivity, sorptivity and rapid chloride migration were evaluated, together with compressive strength to determine compliance with characteristic and target mean strengths. From this limited study of CCA which forms a wider research project, the results indicate that a higher proportion of CCA, both fine and coarse, is detrimental to the resistance to water and chloride ingress, possibly due to the higher water absorption characteristics of the recycled material. The incorporation of GGBS however, significantly improves the durability performance, therefore making structural concrete with fine and coarse CCA a viable option.

Funding

The authors thank the Engineering and Physical Sciences Research Council (EPSRC) and Loughborough University’s Centre for Collaborative and Innovative Construction Engineering (CICE) for the funding of this research, and also AECOM for their support.

History

School

  • Architecture, Building and Civil Engineering

Published in

14th International Conference on Durability of Building Materials and Components

Citation

DODDS, W. ... et al, 2017. The effect of fine crushed concrete aggregate on the durability of structural concrete. Presented at the 14th International Conference on Durability of Building Materials and Components, Ghent, Belgium, 29th-31st May 2017.

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

11/12/2016

Publication date

2017

Notes

This is a conference paper.

Language

en

Location

Ghent, Belgium