Autogenous Shrinkage of Concrete at Early Ages
- Publication Type:
- Conference Proceeding
- 2020, 37 pp. 269 - 276
- Issue Date:
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© 2020, Springer Nature Singapore Pte Ltd. High Performance Concrete (HPC), particularly high strength concrete mixes (60–100 MPa) containing high cementitious content and low w/b ratios (0.40–0.25) is used for some precast elements. Ultra High Performance Concrete (UHPC) up to 200 MPa containing very high cementitious content and very low w/b ratios (0.25–0.17) is also used for precast and prestressed elements in buildings and bridges. Shrinkage characteristics of HPC and UHPC differ considerably from those of conventional concrete. Due to their high cementitious content and low w/b ratios, the drying shrinkage component is significantly smaller when compared with the autogenous shrinkage component. HPC and UHPC elements, when steam-cured, undergo majority of their shrinkage within a few days of casting. In this paper, mechanisms of autogenous shrinkage of HPC and UHPC at early ages are compared under different curing conditions. Contribution of autogenous shrinkage and drying shrinkage components on the total shrinkage is discussed. At very early ages, plastic shrinkage and plastic settlement cracking and factors affecting them for HPC and UHPC are also outlined.
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