Agilia™, a self-compacting, self-levelling concrete, was recommended by Nuvoco Vistas Corp. Ltd (formerly Lafarge India Limited) for constructing a state-of-the-art Oncology Radiation Chamber in Kiran Multi Speciality Hospital in Surat; making it the first-of-its kind in Gujarat. This was made possible by Nuvoco’s Construction Development and Innovation Centre (CDIC), which provided complete customised solutions that also met the stringent regulatory requirements.
The scope of work involved construction of three bunkers of 256 sqm as per the Atomic Energy Regulatory Board (AERB) regulations. These require the density of concrete to be uniform throughout the structure; with minimum density being more than 2400 kg/m3. It bears pointing out that AERB has non-negotiable and stringent guidelines; and does not permit commissioning of a facility unless those specifications are met.
Agilia was used to achieve the desired density and to minimise voids within the concrete by more than 50 per cent as compared to normal concrete. One of the challenges faced during execution was that the structure was approximately five metres below ground level. The laying and changing of the pipeline was critical to maintain a cohesive mix and to avoid pump choking. This was done by maintaining the maximum core temperature below 70°C and a temperature gradient less than 20°C by using higher pozzolane materials in concrete