Glassfibre Reinforce Cement (GRC)
is the name given to products manufactured from a combination of portland cement/sand mix reinforced throughout with alkali resistant glassfibres.It is important to understand that the material is composite with reinforcing elements randomly distibuted throughout the matrix,unlike reinforced concrete where the reinforcing steel is placedprimarily in tensile stress areas.its properties are superior.It prossesses the valuable flexural and tensile strength of the glassfibre.Its higher cement content and lower permeability makes it resistant to moisture penetration,atmospheic attack or sand erosion.
GRC does not contain asbestos,has very good chemical resistant and will not rot nor corrode.it can be formed in flexible mould techniques to a wide range shape and profiles.Considerably lighter than concrete,GRC offer cost saving in transportation,handling and speed of erection.The low weight to GRC panels decreases superimposed loads on the building's structural framing and foundation,providing potential savings in multi stories construction.
Various Aplication
GRC is applicable to wide range of construction areas,such as civil,architecture and agriculture.
GRC's
versatility makes it extremely valueblei n refurbishment work
permitting and accurate reproduction of architectural features of
practically any type.With GRC it is now possible to construct
elaborate building extention which have to be in complete harmony with
the original structures.In highway engineering,GRC can do all
types of permanent structure that concrete can do but
moreeconomical.Aplications include piers and columns,decking,parapets
and earth retaining wall.
GRC
pipes for surface water drainage and sewer land provide excellent
resistance to erosion,chemical attack,and high resistance to water
penetration
Fixing and Assembly
Easy of fxing is another important feature of GRC,GRC
component can easily be made my using conventional concrete precast
techniques.However,they can then be assembled by ordnary tecniques such
as screwing,bolting,bonding,etc,which is not case with concrete.
Generally
load-bearing frames of steel are pre-erected on site.And then ,factory
produced cladding panel are fixed to the frame,with the use of
conventional mastic sealer between the panels.This in the typical
technique of constuction of GRC currently used.This way adequacy
of strength is guaranted,and also the natural thermal and moisture
movement of the material are not restrained.
Thanks to light weight,GRC
panels may alsobe fixedwithout an additional steel frame.they are
directly fixed by using the ordinary casting tecniques,with specially
designed steel brackets to join the adjacent panel.
Mechanical and Physical Properties
Being composite of cement ,GRC
has good fire,thermal,moisture,and acoustic properties.Also,chemical
resistance is broadly similar to that concrete.How ever,since the
standard GRC has high density and high cemment content,it generally has higher chemical resistance than concrete.
Low density GRC
formulation are also used,wich give enhanced thermal and fire
properties wich are particularly suitable for protection aplications.
The mechanical properties of GRC very
according to the particular material being used and the working
environment in dry condition there is little change,but is moist or wet
conditions there is some loss of tensile and impact strength.
Maintenance
GRC it self does nor require significant treatment.Covered with paint,repainting is done as a part of building maintenance.
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