EVOLVE® thermal modelling provides valuable insights into how temperature can rise within a concrete element and how concrete mixes can be modified or preventive measures can be applied to manage the risk of early-age thermal cracking of concrete.
From a technical perspective, EVOLVE® is a 3D simulation finite element model that predicts temperature development and differences, enabling a better understanding of the risk of thermal cracking of concrete.
The accuracy of EVOLVE® models is enhanced by extensive experimental testing of in‑house materials conducted by Boral in collaboration with University of NSW. This leads to better accuracy when compared to other models which have been developed using the materials utilised internationally.
Heat Evolution Curve
Time – 25h Slice Temperature
Technical background
There may be concerns with temperature rise in large concrete elements due to cement hydration. It may be necessary to limit the peak temperature; otherwise, some expansive products, Delayed Ettringite Formation (DEF) may form in the future, potentially leading to concrete cracking. Another issue may be the temperature differential between the hot interior and cold exterior, which can cause tensile stresses on the exterior. If these stresses exceed the tensile strength of the concrete, cracking can occur.
These issues can result in significant problems, including early‑age cracking and the production of expansive products that can lead to cracking after a few years. Rectifying such problems can be costly, requiring extensive rework.
To address this issue, it is essential to consider temperature rise in concrete during the design stage. This is precisely what EVOLVE® thermal modelling solution has been designed to deliver.
Customer insights
A look at our clients’ perspectives
EVOLVE® has now been utilised in more than 100 projects nationally, including One Circular Quay and Atlassian Central, and has received excellent customer feedback. It provides greater certainty in predicting thermal behaviour in higher‑risk structures.
This has resulted in the reduction of placing and curing costs through minimising thermal controls required by consultants, such as chilled water and ice. Additionally, it enhances the certainty in the performance of 'risky’ elements by modelling actual local materials. The benefits may translate into significant time and cost saving on projects.
Analysing cost impacts
Solving heat-related issues requires changes in mix designs, such as addition of SCMs, additional testing, special construction methods and increased batching costs. The cost associated with resolving heating issues can be substantial.
