EFFECTS OBSERVED IN TEMPERATURE RISE EVALUATION TESTS FOR MASS CONCRETE

Yuan-Yuan Chen

《技術學刊》 34卷2期 (2019/06) Pp. 81-94

摘要

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.

關鍵字

Department of Architecture ； he maximum temperature rise ； temperature-time increasing gradient (λ) ； the maximum temperature differential ； p/b (pozzolans-to-binder ratio)