EVOLVE™ thermal modelling can provide 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 aims to predict temperature development and differences, to facilitate a better understanding of the risk of thermal cracking of concrete.
The accuracy of EVOLVE™ models has been enhanced by extensive experimental testing of in‑house materials conducted by Boral in collaboration with University of NSW. This process has strengthened Evolve's™ accuracy when compared to models developed using materials utilised internationally.
Technical Background
Temperature rises can create a range of issues for concrete. For example, there may be concerns with temperature rise in large concrete elements during cement hydration. It may be necessary to limit the peak temperature to prevent Delayed Ettringite Formation (DEF) from forming in the future, potentially leading to concrete expansion and cracking. Another issue may be the temperature differential between the hot interior and cold exterior of concrete, 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 Boral's proprietary EVOLVE™ thermal modelling solution has been designed to deliver.
Customer insights
A look at our clients’ perspectives
EVOLVE™ has now been utilised by Boral in more than 100 projects nationally, including One Circular Quay and Atlassian Central, and has received excellent customer feedback.
EVOLVE™ provides greater certainty in predicting thermal behaviour in higher‑risk structures. This has resulted in a reduction of placing and curing costs through minimising thermal controls required by consultants, such as chilled water and ice.
EVOLVE's™ ability to provide certainty in the performance of 'risky’ elements is further enhanced by the fact that is is based on testing of actual local materials.
Analysing cost impacts
The benefits of using Evolve™ may translate into significant time and cost saving on projects. 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.
