Effects of micro-fibres on early-age properties of concrete

Nguyen, Duy H., Dao, Vinh T. N., O'Moore, Liza and Dux, Peter (2015). Effects of micro-fibres on early-age properties of concrete. In: Dilum Fernando, Jin-Guang Teng and Jose L. Torero, Proceedings of the Second International Conference on Performance-based and Life-cycle Structural Engineering (PLSE 2015). International Conference on Performance-based and Life-cycle Structural Engineering, Brisbane, QLD, Australia, (1555-1564). 9-11 December 2015. doi:10.14264/uql.2016.406

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Author Nguyen, Duy H.
Dao, Vinh T. N.
O'Moore, Liza
Dux, Peter
Title of paper Effects of micro-fibres on early-age properties of concrete
Conference name International Conference on Performance-based and Life-cycle Structural Engineering
Conference location Brisbane, QLD, Australia
Conference dates 9-11 December 2015
Proceedings title Proceedings of the Second International Conference on Performance-based and Life-cycle Structural Engineering (PLSE 2015)
Place of Publication Brisbane, QLD, Australia
Publisher School of Civil Engineering, The University of Queensland
Publication Year 2015
Sub-type Fully published paper
DOI 10.14264/uql.2016.406
Open Access Status File (Publisher version)
ISBN 9781742721477
Editor Dilum Fernando
Jin-Guang Teng
Jose L. Torero
Start page 1555
End page 1564
Total pages 10
Collection year 2016
Language eng
Formatted Abstract/Summary
Proper control of early-age cracking risk in concrete as well as optimisation of relevant processes in precast industry requires an adequate knowledge of tensile and fracture properties of concrete at relevant ages. Despite significant past research, such knowledge is currently lacking. This paper presents the recent results of an ongoing research program aimed to address that important knowledge gap. After briefly outlining notable features of an improved direct tensile testing system, the paper presents key results of an experimental investigation into the tensile properties of concrete of age between 2.5 and 9 hours after mixing, both with and without fibres. Compared to concrete without micro-fibre, micro-fibre concrete is found to have more bleeding, considerably lower and more scattered tensile strength and Young’s modulus, and higher fracture energy and characteristic length. Possible explanations for such differences are also given. Importantly, the roles of microfibres in mitigating the risk of plastic shrinkage cracking are shown to be complex, prompting the need for further study: Although a decreased tensile strength heightens such risk, an increased bleeding helps reduce the risk while the higher fracture energy and characteristic length implies higher ductility.
Keyword Early-age concrete
Tensile properties
Fracture properties
Direct tensile test
Micro fibre
Digital imaging correlation
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 23 Dec 2015, 14:59:04 EST by Anthony Yeates on behalf of Faculty Of Engineering, Architecture & Info Tech