EFFECTS OBSERVED IN TEMPERATURE RISE EVALUATION TESTS FOR MASS CONCRETE

EFFECTS OBSERVED IN TEMPERATURE RISE EVALUATION TESTS FOR MASS CONCRETE

In this study, pozzolans were used to design three mixtures of concrete. In the first mixture, ordinary Portland cement (C00) was used; in the second, slag substituted 30% cement (C30); the third was a combination of slag (20%) and fly ash (30%) with cement 50% (C50). The mixture were poured into mockup blocks (180 × 180 × 160 cm) to obtain the temperature-time curve considering different measurement locations (Points 1-4: the top, middle, and bottom of the block and ambient), compressive strength (included core), and electricity resistivity. The following results were obtained: maximum temperature, 73.2 (C00), 69.4 (C30), and 63.2°C (C50); maximum temperature differential, 21.8 (C00), 21.6 (C30), and 17.6°C (C50); and temperature-time increasing gradient (λ), +2.541 (C00), +1.468 (C30), and +1.078°C/h (C50). C50 mixture satisfied the demands of maximum temperature ?70°C, maximum temperature differential ? 20°C, and λ (minimum) and had enhanced 56-day compressive strength and electrical resistivity. The pozzolans-to-binder ratio and cement content could lead to a reduction in the temperature by 1.94°C/10% and an increase in temperature by 4.6°C/100 kg, respectively.