Abstrakt

Traditional concrete (TC) is primarily composed of a mixture of cement, fine and coarse aggregates, and water. TC is made by mixing together all the components before placing them. Using non-traditional concrete (two-stage concrete) to solve and to eliminate the problem of the aggregate segregation which appears in TC and in the self-compacting concrete. Two-stage concrete (TSC) consists of two main components, namely the grout and coarse aggregate particles. Coarse aggregates are placed into the formwork, and then a fresh grout mixture is injected into the formwork to fill the voids created by the coarse aggregates. The main difference between TC and TSC is the method of preparation and size of aggregates. The described above technology is unique as it allows us to prevent aggregate segregation in a ready mixture. This paper presents the experimental results of preplaced, crushed granite aggregate concreted with five different grout mixture proportions. A total of 48 concrete cylinders were tested in unconfined compression and splitting tension at 28 and 90 days. It was found that splitting tensile strength of the TSC is equivalent or higher than that of TC at the same compressive strength. Splitting tensile strength can be conservatively estimated using the ACI equation for traditional concrete.

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