Direct Shear Mechanical Behavior Of Fiber/Nano Material Improved Coastal Cement Clay

In this study,the mechanical behavior of polypropylene fiber and nanomaterial improved coastal cement clay was evaluated and characterized by the direct-shear tests.Samples on coastal cement clay,fiber-coastal cement clay,nano magnesia–coastal cement clay and fiber-nano magnesia–coastal cement clay were taken into account.The test results revealed that there was a significant improvement on the shear strength of the clay.The comparison among these types of soils indicates that fiber and nano magnesia reinforced coastal cement clay has greater shear strength and deformation modulus than traditional coastal cement clay.The clay was then mixed with fiber and nano magnesium oxide about 1.0 % by dry weight of soil.Three different curing time for samples were designed,namely,7d,14 d as well as 28 d.The failure displacement increases as the applied normal stress increases.The shear strength of the treated clay increased significantly over time after adding fiber/nano-Mg O.Finally,the stress–displacement behavior of these materials is presented with the explanations for the physical meaning of each parameter.