KRYSTOL^TM CONCRETE WATERPROOFING SYSTEM

Kambala Bayview Center Stage One
Sydney, Australia

BACKGROUND
The Kambala Bayview Centre is located in the harbour side town of Rose Bay – an eastern suburb of Sydney, Australia. The centre is a part of the Kambala private school, an independent boarding school for girls, and is home to the school’s successful Early Learning Centre. The Kambala Bayview Centre project involved the construction of an underground six- level carpark, two passenger lifts, staff rooms, work rooms, plant rooms and on site detention tanks.

Because of the school’s close proximity to the Sydney Harbour, the depth of the site and the region’s temperate and oceanic climate, waterproofing the centre was a must. The carpark alone sat 12 metres below ground and was subject to underground aquifer conditions.

SOLUTION
The 700 m3 concrete roof of the carpark was constructed using Kryton’s Krystol Concrete Waterproofing System. The Krystol system uses advanced integral crystalline waterproofing technology to transform porous concrete into a permanent, water-resistant barrier. It provides a guaranteed defense against water damage and steel reinforcement corrosion.

When combined with water and concrete, Krystol causes millions of needle-like crystals to grow and spread throughout concrete, filling the spaces between concrete particles and permanently blocking the movement of water and waterborne contaminants. If cracks form later on, incoming water causes additional crystals to grow again, filling the cracks and ensuring that the structure's waterproofing barrier is protected.

The Krystol Concrete Waterproofing System eliminates the need for external waterproofing membranes, which saves construction time and costs. It provides maximum flexibility and can be used any time before, during or after the construction process. Unlike external waterproofing membranes, Krystol will not deteriorate – it’s guaranteed to last the lifetime of the structure. The Krystol Concrete Waterproofing System includes:

•Krystol Internal Membrane™ (KIM®, an admixture suitable for new concrete construction;
•The Krystol Waterstop System™, an advanced joint design system that provides both physical and chemical waterproofing barriers.

The KIM-treated concrete was placed in a single pour over 650 m3 and 1,500m2 in floor area to guarantee a watertight carpark. The roof had an average thickness of 450 mm to 550 mm. Two large stormwater pumps were also brought in to drain the more than 10,000 litres of subsoil daily.

Another 50 m3 of KIM was used on the centre’s external stairwell and on the detention tank walls where a conventional membrane could not be used.

Project manager, David Menzies said "Krystol was used in the roof structure and other exposed areas of the carpark, eliminating the need for impractical surface applied waterproof membranes," which saved the team time and money by not requiring the use of other materials.

PRODUCT
Krystol Concrete Waterproofing System

LOCATION
Rose Bay, Sydney, Australia

OWNER
Kambala (Private School)

DISTRIBUTOR
Krystol Pty Ltd.

CONTRACTOR
Brisland Pty Ltd.