Shear wave velocity of zeolite-cement grouted sands: Fid-Bau Portal

Shear wave velocity of zeolite-cement grouted sands

Kordnaeij, Afshin / Moayed, Reza Ziaie / Soleimani, Majid

Abstract Cement production is an energetically demanding process and one of the most important sources of CO 2 emission in the world. Consequently, the use of more environmentally friendly supplementary materials which can replace at least a part of cement can be efficacious. In the present study, a laboratory investigation on loose sandy soils (D r ≈ 30%) grouted with cementitious materials (cement and natural zeolite) was conducted to investigate the effects of cementation on the shear wave velocity (V s) of grouted sand specimens. The results showed that in all the sand grain sizes and water to cementitious materials ratio (W/CM), the V s of grouted samples increased with an increase in zeolite content up to 30% (Z opt); however, beyond the Z opt, any increase in the zeolite content reduced the V s. In all W/CM and Z percentage, the V s in grouted specimens decreased with increase in the average sand grain size (D 50). The V s increased following the attainment of equilibrium by CaO with SiO 2 and Al 2 O 3 in the grouted sand specimens.

Highlights • The V s of grouted sands increased with an increase in zeolite content up to 30% (Z opt). • Beyond the Z opt, any increase in the zeolite content reduced the V s. • The V s in grouted specimens decreased with increase in the average sand grain size (D 50). • The V s increased following the attainment of equilibrium by CaO with SiO 2 and Al 2 O 3.