DEVELOPMENT OF THE HIGH STRENGTH AND LIGHT-WEIGHT FOAMED MORTAR ENBANKMENT SUPPORTED BY THE PILES ON THE LIQUEFIABLE GROUND AND THE ADOPTION TO THE RAILWAY CONSTRUCTION WORK

Abstract

  In order to use the light-weight foamed mortar supported by the piles as the structural beam member of the slope to the railway viaduct on the liquefiable ground, the high strength and light-weight foamed mortar that has more than 5N/mm² compressive strength was developed. The authors carried out the material experiments to investigate the material characteristics, the shear and bending experiments of the beam specimens strengthened with the reinforcing bars. As the results, the influence factors to the shear strength in the range of the shear span ratio from 0.5 to 3.0, the compressive strength from 5.1 N/mm² to 12.8 N/mm², the main reinforcement ratio from 0.23% to 1.06% were the same as that of concrete. The authors proposed the calculation formula for the shear strength based on the calculation formula of the reinforced concrete members aimed at the shear span ratio from 0.5 to 2.5. Therefore, these development results put the high strength and light-weight foamed mortar into practical use at the slope (about 77 meter in length) to the railway viaduct on the liquefiable ground.