Instantaneous and time-dependent flexural cracking models of reinforced self-compacting concrete slabs with and without fibres

Farhad Aslani, Shami Nejadi and Bijan Samali

Abstract

Self-compacting concrete (SCC) can be placed and compacted under its own weight with little or no compaction. It is cohesive enough to be handled without segregation or bleeding. Modifications in the mix design of SCC may significantly influence the material\'s mechanical properties. Therefore, it is vital to investigate whether all the assumed hypotheses about conventional concrete (CC) are also valid for SCC structures. The aim in this paper is to develop analytical models for flexural cracking that describe in appropriate detail the observed cracking behaviour of the reinforced concrete flexural one way slabs tested. The crack width and crack spacing calculation procedures outlined in five international codes, namely Eurocode 2 (1991), CEB-FIP (1990), ACI318-99 (1999), Eurocode 2 (2004), and fib-Model Code (2010), are presented and crack widths and crack spacing are accordingly calculated. Then, the results are compared with the proposed analytical models and the measured experimental values, and discussed in detail.

Key Words

self-compacting concrete; crack width; crack spacing; flexural cracking; time-dependent cracking; analytical models

Address

Farhad Aslani : Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, University of New South Wales, Australia Shami Nejadi : School of Civil and Environmental Engineering, University of Technology Sydney, Australia Bijan Samali : Institute for Infrastructure Engineering, University of Western Sydney, Australia

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