Mapei systems chosen for Malaysia’s Klang Valley MRT

The Klang Valley Mass Rapid Transit (KVMRT) is a rail network in Malaysia which, together with other existing services, will form the backbone of the Greater Kuala Lumpur/Klang Valley public transport system centred in Kuala Lumpur. Work on the 51-km Line 1 from Sungai Buloh to Kajang officially started in July 2011 and the line was operational by July 2017, serving as a corridor for approximately 1.2 million commuters.

Construction of Line 1 was carried out under eight contracts (V1 to V8), which were awarded to eight separate contractors by MRT Corporation Sdn Bhd. The major part of the aboveground line is elevated on viaducts (guideways) to avoid built-up areas. The specifications for the project required that the piers and girder segments be provided with a protective coating system, with a durability in excess of 10 years.

Following several tests, Mapei systems were selected for two of the contracts, V1 and V4, which needed approximately 500,000 sq m of repairs and coatings. The systems, consisting of Planitop 130 (for the repair mortar), Colorite Performance S-MY (for the coating) and Antipluviol S-MY, were used by contractors Syarikat Muhibah Perniagaan & Pembinaan Sdn Bhd (V1) and Sunway Construction Sdn Bhd (V4).

Planitop 130 is a normal-setting, fine, grey mortar for surface repairs and finishing of concrete and render. It is suitable for repairing and finishing of porous or chipped cement-based surfaces for both internal and external applications. Due to its high synthetic resin content, Planitop 130 has excellent adhesion to all cement-based surfaces and forms a compact and mechanically strong layer after hardening. This fibre-reinforced system also provides improved tensile strength and crack-resistance.

Once Planitop 130 has been applied, the surface was protected by Colorite Performance S-MY, a high-performance, solvent-based methacrylate coating designed for protection and decoration of concrete and masonry structures. The system is normally used for new structures and also for concrete repair works as the final protective and decorative finish. It offers excellent weathering and ageing properties, and is highly durable even in tropical conditions.

The Colorite Performance S-MY was used in conjunction with Antipluviol S-MY, a solvented, hydrophobic, silane-siloxane primer that penetrates the substrate and repels water. As a result, it can resist the penetration of water-borne aggressive agents such as chlorides in marine environments.