Sika®-4a Rapid Setting Waterproofing Admixture 5L

Sika®-4a is a rapid setting waterproofing admixture designed to quickly seal areas of severe water infiltration through concrete, rock, or masonry. When mixed with ordinary Portland cement and water, it rapidly sets, making it an ideal solution for emergency leak plugging and waterproofing applications. This product is suitable for use in tunnels, culverts, water reservoirs, concrete pipes, and manholes, as well as for quick-setting mortar in assembly work, such as fixing anchors, bolts, and fittings subjected to early loading.

Features:

• Rapid setting for quick leak plugging and fixing.
• Ready to use—just add clean water and ordinary Portland cement.
• Does not contain chlorides.
• Solvent-free.

Technical Data:

• Brand - Sika
• Product Type - Waterstop
• Volume - 5ltr
• Appearance / Colour - Clear liquid
• Chemical Base - Blend of inorganic chemicals
• Density - ~1.25 g/cm³
• pH-Value - ~12
• Total Chloride Ion Content: ≤ 0.1%
• Storage Conditions: Store in original sealed packaging in a dry, cool place (5°C - 30°C). Protect from direct sunlight, frost, and contamination.
• Shelf Life: 12 months

Application:

• Before starting work, wear suitable protective clothing, gloves, and goggles.
• Mix Sika®-4a with clean water at the required dilution rate based on application needs and water pressure.
• Pour the liquid into a clean mixing container.
• Quickly add cement until the liquid is covered (approximately 3 parts cement to 1 part liquid).
• Mix thoroughly and rapidly into a paste and use immediately.
• Only prepare as much product as can be applied immediately.
• Mould the Sika®-4a paste by gloved hand into a plug and immediately place it into the hole, pressing firmly until the mix has set.
• Cover the paste with a subsequent coating of Sika® waterproofing mortar.
• For medium to heavy water infiltration, divert the water to discharge points formed of short lengths of plastic tube bonded into drilled holes using Sika®-4a.
• This will reduce the pressure until the waterproofing final render has fully hardened. The plastic tubes can then be removed and the holes plugged using a mix of Sika®-4a (diluted 1:1 with water) with cement.
• Do not apply the final layer of render until discharge tubes have been removed and water infiltration has stopped.
• In areas of high water pressure, increase the prepared area around the discharge tubes to provide a larger bonding surface for the Sika®-4a paste.

Cleaning:

• Clean tools and equipment immediately after use with water.