Abstract: The influence of different basalt fiber volume content on the strength of shale lightweight aggregate concrete was studied.The results of test show that basalt fiber can improve the lightweight aggregate concrete compressive strength, flexural strength and elasticity modulus in a certain extent.When the volume content of fiber is 0.2%, the compressive strength and flexural strength reach the maximum, which is increased by 11.49% and 20% respectively.The splitting tensile strength of lightweight aggregate concrete increased with the increase of fiber content;When the fiber content is 0.3%, the splitting tensile strength reached the maximum, and is increased by 54.59%.That basalt fiber shale lightweight aggregate concrete not only increases the strength of each phase, but also improves the brittleness of lightweight aggregate concrete defects in a certain extent and playes a role in strengthening and toughening.

Key words: basalt fiber;shale lightweight aggregate;fiber content;strength