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  Innovations in the Use of Fibre Reinforced Precast Segmental Tunnel Linings in Klang Valley Mass Rapid Transit Project

  Fibre reinforced concrete (FRC) has been used in Malaysia underground projects since the 1980’s. The majority of FRC applications in underground projects in Malaysia has largely been in sprayed concrete for tunnel linings. FRC in sprayed concrete can be found in many hydropower, hydraulic and road tunnel projects in Malaysia. In 2011, FRC was finally adopted following design recommendations in FIB Model Code 2010, for use in precast segmental tunnel linings in Klang Valley MRT SBK Line and this continued into the SSP Line in 2016. In only 2 projects, there has been innovations developed in the use of FRC in precast segmental tunnel linings. Using improved medium-strength steel fibres, the steel fibre and polypropylene fibre dosages were reduced from 40kg/m3 to 35kg/m3 and 2kg/m3 to 1.5kg/m3 respectively while still achieving the required SFRC performance. The use of improved automation in dosing of steel and polypropylene fibres also contributed to reduction in material wastage. Wastage in terms of segment rejection was reduced from 3% to 1.5% with the use of FRC.

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