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Brazilian natural fibre reinforced cement

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    1. Brazilian natural fibre reinforced cement Holmer Savastano Jr. Rural Construction University of So Paulo, Brazil FAO Joint Meeting, Salvador, July 9th 2003

    6. Highlights Appropriate raw material Low cost cement Vegetable fibre Composites preparation Formulation & production Results & Discussion Physical & mechanical properties Accelerated ageing tests Microstructure analysis Applications

    7. Objective Cementbased matrix reinforcement with alternative fibre original fibre x cellulose pulp Synthetic fibre Evaluation of physical and mechanical performance microstructure behaviour Different applications roofing tiles water tanks

    8. Appropriate raw material

    13. Coconut husk fibre

    15. Fibre & composite preparation In collaboration with CSIRO Australia

    21. Composite preparation

    22. Performance of cement-based composites Short & long term

    23. MOR (28 days)

    24. Toughness (28 days)

    25. Microstructure of composite Back-scattering image 4% of sisal slivers in OPC Transition zone Porosity Cracking

    26. EDS analysis of sisal Kraft in OPC

    32. Mechanical modelling In collaboration with Princeton University, US

    33. Mechanical behaviour Inter-Americas Materials Collaboration NSF, CNPq & Colciencias funding Mechanisms of cracking in cementitious materials

    37. Roofing tiles

    39. Physical & mechanical properties of the roofing tile

    40. Individual shelters for calves

    41. Roofing installation

    42. Thermal comfort

    43. Testing of corrugated sheets

    44. Loading simulation

    45. Water tanks Study in partnership with Brazilian industries

    46. Matrix composition

    47. Cellulose pulp

    48. PVA fibre

    49. Water tank fabrication

    51. Composites with different cellulose pulps

    52. MOR x PVA content

    53. Physical properties x PVA content

    54. Accelerated ageing test (1.5% PVA)

    55. (...) Accelerated ageing test (1.5% PVA)

    56. Effect of the addition of silica fume on the mechanical behaviour of fiber cement composites

    57. Packing mechanism Smaller particles are introduced and distributed to the interstices of larger packed particles Porosity reduction.

    58. Formulations Four formulations with different amounts of silica fume and PVA

    59. Physical results

    60. Mechanical behaviour

    61. After accelerated ageing...

    62. Comments Mechanical behaviour FS8 equivalent to FS14 (0.8 - 1.4% of synthetic fibre) Physical performance Reduction of water absorption after the wetting-drying test. Slight reduction of mechanical performance after accelerated aging test.

    63. Research infrastructure USP at Pirassununga

    64. Fibre treatment

    65. Mechanical testing machine

    66. Ageing tests

    67. Research team Post graduate students 3 doctorate students 1 master student Under graduate students 5 granted students Opportunities Post-graduation programs Post-doctoral program

    68. Final remarks Innovate materials fibre-cements adequate techniques Materials performance & durability Affordable housing and infrastructure Human development

    69. Governmental sponsors

    70. Contacts Holmer Savastano Jr. Rural Construction Group - FZEA - USP P.O. Box 23 - 13635-900 Pirassununga SP Brazil Tel +55 19 3565 4153 Fax +55 19 3565 4114 holmersj@usp.br