PROPERTIES OF CEMENT MORTAR BY MIXING FIBRES STEALTHE3 CEM-FIL

Abstract: Concrete mortar possess very low tensile strength, limited ductility and little resistance to cracking. Addition of small closely spaced, uniformly distributed fibres act as crack arrester, substantially increase static and dynamic properties with increasing water content bleeding, plastic shrinkage and reduction in strength will occur with decreasing water content hydration process is incomplete, increase in gel/ space ratio will happens by adding plasticisers and other chemicals for workability and to achieve strength will act temporarily. To come across these two problems by the addition of small amount of fibres effectively control early age plastic shrinkage and cracking. In the present work two types of fibres Poly propylene (PP) fibre STEALTHe3, Alkali Resistant (AR)fibre CEM- FIL was used. PP fibre act mechanically in the cement mortar and act as crack arrester with increased Flexural, Compressive, and Split tensile strength properties. AR fibre act chemically with the cement mortar by the formation of ZrO2 and SiO2 .These two oxidants act with the C-S-H gel and CaOH2 which are by products of hydration. By increasing alkali content in the cement mortar, durability properties are shown in our work. Both fibres have increased mechanical and durability properties when compared to control mix. In water absorption test both fibres have no effect because fibre will evaporate at the temperature of 1100C. Finally as result we conclude that addition of small amount of fibres will increase 5 to 15 % in strength and durability properties of cement mortar.

Keywords: Concrete mortar, Poly propylene fibre STEALTHe3, Alkali resistant fibre CEM- FIL, strength and durability.