ABSTRACT
Concrete wastes have been recycled only for macadams, but they have not yet been utilized for aggregates of concrete.
Therfore the authors conducted studies on the strengths of concrete containing recycled concrete aggregates in order to utilize these wastes.
The concrete with recycled concrete aggregates showed lower compressive strength than ordinary aggregate concrete by 15 percent. The tensile strength, bending strength and shear strength of the concrete were lower than ordinary aggregate concrete by 10, 7 and 32 percent respectively. Similarly, the concrete showed lower elastic modulus and unit weight.
Meanwhile, the development ratios of each strengths with age of the concrete containing recycled concrete aggregates were similar to those of ordinary aggregate concrete. The relationship between the compressive strength and other strengths such as tensile strength were the same as that of ordinary concrete. The relation between the compressive strength and the elastic modulus was also similar to that of ordinary concrete.
Based on these results it was concluded that the concrete containing recycled concrete aggregates could be utilized for general structural concrete.
