Design of a Large Scale Restrained Shrinkage Testing System

摘要

This paper presents results from a recent study in which a finite element model was used for predicting the performance of restrained shrinkage cracking in concrete slabs. The slabs will be used to evaluate the performance of different mixtures at 'full scale' in a carefully controlled environment (relative humidity, temperature, and wind). The paper reviews some of the design considerations that have gone into the development of the testing system. The finite element model considers the concrete as an aging, viscoelastic material. The model uses non-linear fracture mechanics that is incorporated with cohesive law concepts. The numerical results from the model will be compared with experimental data. This work will specifically illustrate the role of specimen size and reinforcing materials in crack development.