During refurbishment works to the soffit of a University building cracks were identified. CSC Services were tasked with the emergency repairs, which included over 170 metres of cracks in the concrete soffit, and wood treatment to protect against future problems.
Images from the crack injection work undertaken at Sunderland University show operatives installing a high performance joint and crack waterproofing system.
A Sika crack Injection System was used to seal and repair the overhead cracks. This system can be used on cracks of 0.2mm to 5.0mm cracks in concrete structures.
Dustless grinders were used to clean the cracks for repair. Injection flanges were fixed over the centre of each crack surface and sealed with Sikadur 31, an epoxy adhesive mortar. Sikadur 52 was then injected under pressure from the lowest flange until it exuded from the next flange. The first port was sealed off and the second port injected. This process was repeated for the remainder of the cracks. Once the cracks were filled and Sikadur 52 fully cured, ports were removed, and all excess adhesive mortar and resin ground back.
Crack repairs were then overbanded with a Sika Combiflex system. This high performance joint sealing system is used on construction, expansion and connection joints as well as cracks. When fixed to the joint or crack it allows irregular and high movement in more than one direction, whilst maintaining a high-quality seal.
Images from the work are shown in the following slide show
CSC Services can install high performance joint and crack injection waterproofing systems to a range of concrete structures including basements, infrastructure and sewage treatment plants. Call 0191 410 3444 today for more information.