Study on Ferrocement Panels for Use in Secondary Roofing
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 4
Abstract
In tropical climatic conditions the terrace slab is subjected to direct sunlight and subsequent heat radiation in to the dwelling units. The conventional weathering coarse adopted in the industry to offer thermal insulation, such as laying of brick bat tiles, application of heat reflective coating, laying of light weight concretes and tiles, etc. has other negative consequence although it offers minimal thermal comfort. The secondary roofing concept involves laying of Ferro cement panels one foot above the original RCC slab is an viable option. There is a need for developing a Ferro cement panel which offers excellent strength and durability properties for use in secondary roofing application. This investigation studies the flexural performance of ferrocement panels with different mesh types, configurations and mix ingredients. The mesh types employed in the study includes galvanized wire mesh and crimped wire cloth mesh. The variations in the mix ingredient are ordinary mortar and flyash modified mortar (40%). Fresh mortar and hardened mortar properties including water absorption test were also found as per Indian standards for control and flyash modified mortar. In each category three ferrocement panels are cast and subjected to flexure strength test as per BIS 516-1968(Methods of Tests for strength of concrete) by four point loading method. The test was conducted in a 40 ton capacity universal testing machine with special fixtures for supporting specimens. The load is applied at a lower rate, continuously without shock during entire test period. The performance indicates such as first crack load, ultimate load carrying capacity, crack region, crack pattern including loaddeflection behavior was observed. Flexure strength results on ferrocement panels exhibited that panel with single layer crimped wire cloth mesh and in combination with galvanized mesh offer significant increase in ultimate load carrying capacity of the order 40-50% as compared galvanized wire mesh panel irrespective of no. of layers. It is also found that there is an improved ductility ratio of 60% for crimped wire cloth panels and combination of crimped cum galvanized panels as compared to galvanized wire mesh panels. The load-deflection behavior clearly indicates that there is a manifold improvement in the energy absorbing capacity of crimped wire mesh panels and crimped cum galvanized wire mesh panels. It is concluded that crimped wire mesh panels made of ordinary and flyash modified mortar offers appreciable flexural strength properties and will be a viable option for mass production of Ferro cement panels for use in secondary roofing.
Authors and Affiliations
S. Binil Sundar, U. Dhiyaanesh
Keywords
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