Mechanical behavior and durability of compression moulded sisal fiber-cement mortar laminates (SFCML)

Title: Mechanical behavior and durability of compression moulded sisal fiber-cement mortar laminates (SFCML)
Author(s): F. A. Silva, J. A. Melo Filho, R. D. Toledo Filho, E. M. R. Fairbairn
Paper category : conference
Book title: ICTRC'2006 - 1st International RILEM Conference on Textile Reinforced Concrete
Editor(s): J. Hegger, W. Brameshuber and N. Will
Print-ISBN: 2-912143-97-7
e-ISBN: 2351580087
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 171 - 180
Total Pages: 10
Nb references: 12
Language: English

Abstract: Cement based laminates reinforced with five layers of long unidirectional aligned sisal fibers (SFCML) were developed and their mechanical behavior was characterized in this study. Both, flat and corrugated sheets, were cast by a manual lay-out of the fibers in a self-compacted cement matrix and compressed with a pressure of 3 MPa. To ensure the durability of the composites, the ordinary Portland cement (OPC) matrix was modified adding metakaolin (MK) and calcined clay brick powder (CCB) to consume the calcium hydroxide (CH) generated during the hydration of the Portland cement. The durability of the laminates was determined using wetting and drying cycles in a forced air flow chamber that allows the control of the wind velocity and air temperature enabling a simulation of the environmental conditions to which the material is subjected in real life. In this study, the air chamber was set to a wind speed of 0.5 m/s and a temperature of 37 oC. The composites were subjected to 25 cycles of wetting and drying after 180 days of fog cure. The flexural toughness and the post-cracking flexural strength were used to evaluate the durability of the composites. The results of the bending tests indicated that the composite containing calcined clay featured an improved durability. Corrugated and plain sheets were tested under three-point bending tests. The first crack and the ultimate strength were determined showing that the corrugated composite is 2.62 times stronger than the flat one. The toughness was determined in a three-point bending test and the results showed that the strength of the corrugated sheets was two times as high as that of the flat sheets.

Online publication: 2006-06-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580087.017