TECHNOLOGIES

Technology

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Glass Fibre Reinforced Gypsum (GFRG) Panel Building System is the latest building technology introduced by Building Materials & Technology Promotion Council Ministry of Housing & Urban Poverty Alleviation. Gypsum (calcium sulphate) is a material that calcines at a relatively low temperature to produce the required hemihydrates product. The proportions and forms of di-hydrate and anhydrate in the plaster products are very sensitive to calcining conditions, particularly temperature.

Fluidised bed Calciner design provides very limited temperature gradients across the bed of material being processed with the result that the calcining conditions can be more readily controlled to provide the required plaster product specification.The essence of the design is that it provides a pronounced velocity gradient across the lower region of the fluidised bed with the effect of keeping the whole bed of material in suspension.

GFRG panels are manufatured in moulding process from high grade gypsum plaster and glass fibre rovings to a size of 12 metres by 3 metres by 124 millimetres thick. The hollow sections have 250 milli metres. Panels are loaded on to collapsable frames called stillages ready for transport to the building site. The production and quality of panels and wall plaster are monitored using sophisticatied control systems.

Structural Design

The Building Materials and Technology Promotion Council of India has approved the design. All hollow parts at the joints are filled with concrete and vertical walls are reinforced. These serve the purpose of conventional reinforced concrete columns. Gaps are provided for plumbing and electric works. The conduits are made before concrete is placed on the roof. Care is also taken to drain rainwater by providing a slope. A multi-storey house can also be built by using gypsum panels as walls in the similar manner done at the ground floor. The joints are filled with concrete.

Then walls, staircases and finally the roof are built using gypsum panels. The hollow gaps between two panels of the roof are filled using the concrete mixture and they are also reinforced. Special structural design is prepared for the building to withstand lateral loads such as earthquakes and storms

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Manufacturer

Calciner

These panels are being manufactured at FACT-RCF Building Products Ltd in Kochi, a joint venture between Fertilizers & Chemicals Travancore Ltd (FACT) and Rashtriya Chemicals and Fertilizers, Mumbai, in collaboration with the Australia’s Rapidwall Building Systems. Proposals are being mooted with the Indian Government to set up manufacturing units to produce GFRG panels across the country to further scale down transportation costs of these panels.