Experimental Investigation of the High Temperatures Effects on Self-Compacting Concrete Properties

Self-compacting concrete (SCC), which appeared in the 1980s in Japan, is a concrete that differs from others by its high fluidity. The constituents of SCC can be quite different from those of ordinary concretes. They can differ both in their proportions and in their choice. Given the method of installation of SCCs, particular attention is paid to the study of their physical and mechanical characteristics. In this context, experimental tests were conducted to assess the effect of high temperatures on the behavior of SCC. For this purpose, a SCC and ordinary concrete (OC) were tested at temperatures of 20, 150, 300, 450, and 600 degrees C. Prismatic specimens of dimensions 100 x 100 x 400 mm(3), cylindrical specimens of dimensions 160 x 320 mm, and parallelepiped specimens of dimensions 270 x 270 x 40 mm(3) were prepared for physical (thermal conductivity) and mechanical (compressive strength, elastic modulus, flexural strength, and ultrasonic pulse velocity) tests. The results showed an increase in the compressive strength for SCC between 150 and 300 degrees C following an additional hydration of the cementitious matrix. The residual flexural strength of the concretes decreases progressively with the increase in temperature. This reduction is about 90% from 450 degrees C to 600 degrees C. The results also showed that the thermal conductivity of concrete decreases as the temperature increases and can reach a value of 1.2 W/mK for the heating temperature of 600 degrees C.

Automated summary

Self-compacting concrete (SCC) is characterized by high fluidity and different from ordinary concrete in composition and performance. Experimental tests showed that the compressive strength of SCC increases between 150 and 300 degrees C, but the flexural strength decreases at high temperatures. Additionally, the thermal conductivity of concrete decreases with increasing temperature.