THE STUDY OF PHASE CHANGE AND HEATING AT TEMPERATURE 300 500 700 AND 1000O C AGAINST PORTLAND COMPOSITE CEMENT (PCC) STRENGTH

• Main Author: Ilmi Rais Akbar, Imannur
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/39676
• Institution: Institut Teknologi Bandung

Fires in buildings are disasters that pose a threat of loss to the human life, property, and environment. Some of the buildings affected are concrete. Concrete consist of cement material, coarse aggregate and fine aggregate. Cement has a function as a concrete binder, and concrete functions as a support or frame in a building. This study studied compressive strength, crack growth and hydrated cement phase changes after heating 300, 500, 700 and 1000o C, and studied the rehydration process after heating at a temperature of 1000o C for 1 hour and smoothed to determine whether the hydration process was reversible have been observed. Compressive Strength testing was carried out on a sample of 5 cm x 5 cm according to ASTM C-109 made of cement mixed with 3 : 1 water, then left at room temperature for 28 days. The compressed test samples were also characterized using XRD to study phase changes that occur after heating. The results showed that the greatest reduction in compressive strength occurred at 1000o C with a 3-hour exposure time, a decrease in strength of 93%. The phase formed in hydrated cement is CSH, but when heated 1000o C the CSH phase is lost but the CS-? phase is different from the cement phase before hydration. In addition, observing crack growth was also carried out by calculating the volume change, the largest crack growth occurred in samples with a heating of 700o C. The results of the rehydration process found that the cement hydration process is irreversible.