ABSTRACT
The variation in the modulus of elasticity with rubber aggregate content is illustrated in figure 2.
3.2 Four-point flexure tests
The curves in figure 3, typical examples of the results obtained, enable each mix to be characterized by the load bearing capacity Fmax and by the corresponding deflection named the strain capacity (δ
3.3 Effect of rubber aggregate incorporation on the concrete resistance to the cracking due to restrained shrinkage
One of the advantages expected from the enhanced strain capacity of rubberized concrete is an improved resistance to cracking due to restrained length change. Tests were performed according to a standard test method for determining age at cracking and induced tensile stress characteristics of concrete under restrained shrinkage (ASTM standard C 1581-04). This method consists of casting concrete in a circular mould around a steel ring having two strain gages as indicated in figure 4. Steel ring strain versus specimen age is illustrated in figure 5.
