Performance of Gravelstone Concrete Incorporating Silica Fume at Elevated Temperatures

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Title: Performance of Gravelstone Concrete Incorporating Silica Fume at Elevated Temperatures

Author(s): V. M. Malhotra, H. S. Wilson, and K. E. Painter

Publication: Special Publication

Volume: 114

Issue:

Appears on pages(s): 1051-1076

Keywords: compressive strength; concretes; flexural strength; high temperatures; performance; sand gravel concrete; silica fume; ultrasonic tests; Materials Research

Date: 5/1/1989

Abstract:
Reports performance of gravel concrete incorporating silica fume after 72 hr exposure at 150, 300, and 450 C. A total of eight concrete mixtures, each 0.09 m3 in volume, were made at water-cement ratios of 0.23, 0.35, 0.50, and 0.71. The mixtures at each w/c consisted of one control mixture and one incorporating 8 percent silica fume by weight of cement. The cylinders and prism specimens were cast for testing in compression and flexure before and after exposure to the elevated temperatures. Before exposure to the elevated temperatures, the test specimens were moist cured for 7 days and air dried for 21 days at ambient temperature and 50 percent relative humidity. After exposure, the test specimens were cooled to room temperature and tested in compression and flexure. The weight loss and pulse velocity determinations were made before and after heat exposure. The test results show that after 72 hr exposure at 150, 300, and 450 C, the performance of the control concrete in the compression testing mode is marginally superior to that of the silica fume concrete. The reverse is true when the two types of concretes are tested in the flexural mode.