PURPOSES: As pavement generally provides service shorter than an expected life cycle, maintenance cost increases gradually. In order to help extending the service life and reduce maintenance cost, a new multi-functional composite pavement system is being developed in Korea. METHODS: This study is a part to develop the multi-functional composite pavement and is to investigate the mechanical performances of fiber-reinforced lean concrete for pavement subbase. The inherent problem of fiber reinforced concrete is dispersion of fibers in concrete mix. This study additionally evaluated fiber dispersion characteristics with respect to different fiber types. RESULTS: From the test results, the compressive strengths of the concretes satisfied the required limit of 5MPa at 7days. The standard deviation of the measured number of fibers were lower in the order of nylon, steel fiber and polypropylene. CONCLUSIONS: Reject ash was shown to be satisfactory as a replacement material to Portland cement in lean concrete base. The fiber volume fraction is suggested to be 0.4% even though the fracture toughness did not vary significantly with respect to fiber types. However, fracture energy absorbed up to complete failure increased with the increased fiber volume fraction increment.

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.

this study evaluates the drying shrinkage strains regard to fiber reinforcement in order to reduce cracking of the lean concrete mix so as to control the damage of the pavement by means of fiber reinforcement

This study carried out test construction of fiber reinforced lean concrete for composite pavement system. Sensors were installed in order to measure temperature, humidity, and strain at 3cm and 12cm depth from surface. The measured results revealed that temperature variation of variables were similar each other at same depth

Road pavement in Korea generally undergoes in-service shorter than an expected life cycle. There are many reasons including increased traffic load and other attacks from exposure conditions. In order to extend service life and upgrade the pavement a new multi-functional composite pavement system is being developed in Korea. This study investigates strength of fiber reinforce lean concrete which used fly-ash and reject ash as a cement replacement. In addition this study suggest an appropriate compaction method in order to minimize the experimental scatters that used to come from non-unified specimen fabrication.