The use of clinker-efficient cements is an essential step towards further reducing CO₂ emissions from cement and concrete. Since construction tasks are becoming more and more complex in many places, it must be ensured that the fresh concrete properties can also be precisely adjusted when using new clinker-efficient cements. Furthermore, it must be possible to take into account changes in strength and heat development during planning and construction where necessary.
The aim of the project is to expand the state of knowledge regarding the fresh concrete properties and hardening behaviour of concretes with CEM II/C-M and CEM VI cements and thus to facilitate their future application in construction practice. This will result in advantages for numerous companies involved in construction, including a large proportion of SMEs. The basis is formed by experimental investigations on concretes with variations of the main constituents of cement or the cement composition. Concretes with CEM II/C-M and CEM VI cements will be examined to determine whether changed properties can be expected in comparison to concretes with the cements commonly used to date according to DIN EN 197-1. The effect of superplasticisers, the stiffening behaviour, the water separation (bleeding) and the risk of sedimentation of the aggregate will be investigated on the fresh concrete. In addition, the strength development of the concretes at different temperatures and the heat of hydration development will be investigated. Based on the results of the experimental investigations, it will be examined to what extent the current models for describing the strength development and the influence of temperature on the hardening rate are applicable for the concretes with CEM II/C-M and CEM VI cements.
The results of the project will form an important basis for the application of concretes with new clinker-efficient cements for cement manufacturers, concrete producers, construction contractors and planners, and thus for a large number of SMEs.