Mechanical Performance of Fiber Reinforced Lean Concrete for Subbase of Newly Developed Multi-Functional Composite Pavement System

Abstract

PURPOSES :This study is to investigate the mechanical performance of the fiber reinforced lean concrete with respect to different types of fibers. METHODS :Increased vehicle weight and other causes from the exposed conditions have accelerated the deteriorations of road pavement. A new multi-functional composite pavement system is being developed recently in order to extend service life and upgrade the pavement. A variety of tests were conducted before and after hardening of the concrete. RESULTS :From the test results, it was found that the use of different types of fibers did not affect the compressive strength development. This might be due to the inherent property of the lean concrete. When steel fibers were used relatively greater flexural strength and flexural fracture toughness were developed. Also addition of fly ash by replacing a part of Portland cement the fracture toughness was slightly increased. CONCLUSIONS :It has been known that the addition of fibers and use of mineral admixture can be positively considered in the development of multi-functional composite pavement system as its required mechanical performance is obtained. Keywords fiber reinforced lean concrete, base course material, mechanical properties, fly ash