Mechanical properties of high performance cement binders reinforced with wollastonite micro-fibres

✍ Scribed by Norman M.P. Low; J.J. Beaudoin

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 685 KB
• Volume: 22
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(92)90122-c

✦ Synopsis

Factors that influence the flexural strength characteristics of the cement-water and the cementsilica fume-water systems reinforced with inorganic wollastonite micro-fibres are discussed. The effect of the wollastonite micro-fibres on matrix pore structure was investigated using mercury intrusion porosimetry and helium gas pycnometry. Fibre-matrix interaction was also examined using the conduction calorimetry method. Results indicated that natural wollastonite micro-fibres are effective in improving both pre-peak and post-peak load behaviour. The results are discussed in terms of composite theory and matrix m~crostructure.

~u~on

The study of high performance cement-based material systems has intensified in recent years. Research and development activities in this area have coincided with a national focus on infrastructure renewal. The development of high performance cement-based material systems generally involved the use of silica fume as these composite products are found to have low permeability to aqueous solutions. The achievement of improvement in the strength characteristics, however, does not necessarily insure the attainment of high performance. Durability and long term service requirements have become a more important concern for both new construction and rehabilitation projects in the construction industry. Repair materials must be compatible with the new genre of concretes. In recent years, many potential cement composites for repair have been developed and they are commonly reinforced with fibrous materials. This is due to the fact that these fibrereinforced composites can be designed to have specific strength and toughness characteristics [1,2].