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Combined effects of water film thickness and polypropylene fibre factor on fresh properties of mortar

Author(s): L.G. Li, J. Zhu and A.K.H. Kwan
Paper category: Proceedings
Book title:4th International Symposium on Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi & Zuhua Zhang, Hunan University, China
Kamal Henri Khayat, Hunan University, China
Missouri University of Science & Technology, USA
Publisher: RILEM Publications SARL
Publication year:2018
Total Pages:7
Language : English

Abstract: Previous studies of the authors on the fresh properties of the mortar portion of concrete have revealed that the water film thickness (WFT) is the key factor governing the rheological performance of mortar. However, such studies were limited only to plain mortar containing no fibres. For mortar containing fibres, such as polypropylene (PP) fibres, there have been no
similar studies. To investigate the combined effects of WFT and fibre factors (fibre content and fibre length) on the fresh properties of PP fibre mortar, a number of mortar samples with various water/cement ratios, PP fibre contents and PP fibre lengths were produced for packing density and workability measurements. It was found that apart from the indirect effects
through the change in WFT, the fibre content and fibre length also has direct effects on the workability. Lastly, a new model based on WFT and fibre factor is developed and a very good correlation of the slump results of mortar to the WFT, fibre content and fibre length have been obtained, indicating that the WFT and fibre factor are together the governing factors.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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