Effects of Basalt Fiber on Strength of Alkali-Activated Slag-Tailing Cement Bodies

The influences of different quantity of basalt fiber and lead–zinc tailings on the strength of alkali-activated slag-tailings cement bodies were studied. After adding basalt fiber, the uniaxial compressive strength of the 50 and 60 g per unit tailing cement bodies increased before decreasing throughout a 7-day curing period. During a 28-day curing period, the uniaxial compressive strength of the 50 g per unit tailings cement decreased gradually, while the uniaxial compressive strength of the 60 g per unit tailings cement increased first and then decreased. Furthermore, after adding basalt fiber, the flexural strength of the 50 g per unit tailings cement body decreased gradually during a 7-day curing period, while the 60 g per unit tailings cement increased first and then decreased. Under a 28-day curing period, the flexural strength decreased first and then increased for both cement bodies. Finally, At the confining pressures of 2, 4 and 6 Mpa, the increase amplitude of the triaxial compressive strength of the cementation body was different with the addition of basalt fiber. The increase amplitude of the triaxial confining pressure from 2 to 4 Mpa was higher than that of the triaxial compression from 4 to 6 Mpa.