Structural failures from high temperature effect and remedial measures in the Nigerian environment.

Abstract

Three conventional normal strength concrete grades 20, 25, and 30 were investigated, under very high temperatures which ranged from 2500C and 10000C. Sample cubes were made from cement, sand and coarse aggregates [20mm diameter granite chippings], with water/cement ratio equals 0.62. After 90 days curing, the specimens were subjected to heat in a regulated oven, which temperature varied between 2500C and 10000C. The results obtained show that the concrete grade 20 exhibited higher resistance to heat than concrete grades 25 and 30. Although, at 10000C, none of these concrete cubes was of structural importance any more as the compressive strengths fell below 5N/mm2.