Experimental study on size effect of carbon fiber reinforced concrete subjected to quasi-static compression

Abstract

In order to explore the size effect of the basic mechanical properties of carbon fiber reinforced concrete (CFRC) under compressive load, uniaxial quasi-static compression tests were carried out on CFRC specimens with two kinds of geometric sizes (70.7 mm × 70.7 mm × 70.7 mm and 150 mm × 150 mm × 150 mm) and five kinds of fiber volume contents (0%, 0.1%, 0.2%, 0.3% and 0.4%). Based on this, the size effect characteristics of cube compressive strength of CFRC were analyzed. The results show that adding carbon fiber into concrete matrix can effectively improve the static compression performance of concrete. The cube compressive strength of CFRC has obvious size effect, and the content of carbon fiber has a great influence on the size effect of concrete compressive strength. The sensitivity of the size effect of concrete cube compressive strength to carbon fiber shows a change trend that first increases and then decreases with the increase of the volume content of carbon fiber.