Abstract: In this paper, the effects of glass fiber, steel fiber, basalt fiber and lignin fiber on the autogenous shrinkage and drying shrinkage of mortar were studied. Through the study of autogenous shrinkage, dry shrinkage and wet swelling after drying shrinkage of mortar reinforced with different fibers, the results show that glass fiber has the best effect on restraining the shrinkage of mortar and the volume stability in four kinds of fibers. Lignin fibers have better inhibition effect on the early shrinkage of mortar, but the inhibition ability on the long-term shrinkage of mortar is the worst among the four kinds of fibers. The drying shrinkage of fiber mortar in 90 days is as follows: lignin fiber mortar>reference mortar>steel fiber mortar>basalt fiber mortar>glass fiber mortar. The autogenous shrinkage of fiber mortar is much lower than that of dry shrinkage. The autogenous shrinkage of fiber mortar in 90 days is as follows: reference mortar>lignin fiber mortar>steel fiber mortar>basalt fiber mortar>glass fiber mortar.

Key words: dry shrinkage, autogenous shrinkage, glass fiber, lignin fiber, mortar