The tensile and swelling behavior of cement-stabilized marine clay reinforced with short waste fibers

摘要

Short waste fibers are used to suppress the expansion and improve the tensile strength of cement-stabilized marine clay (CMC). The fiber-reinforced mechanism and characteristics are revealed by experimental and numerical methods. First, the curing effect of the CMC when adding a composite curing agent is observed by scanning electronic microscopy, as is the contact surface between the fiber and the matrix. Then, the expansion rate and the tensile strength of fiber-reinforced cement-stabilized marine clay (FCMC) are illustrated by an expansion experiment and a direct tensile experiment, respectively. The results show that the sample with the cement content of 0.1% and the fiber length of 10?mm is the best in terms of strength enhancement and expansion inhibition. Finally, the mechanism of fiber reinforcement is discussed following a single fiber pullout experiment and some comprehensive explanations are proposed to verify the results of the tensile experiment. A numerical simulation of a single fiber pullout from a matrix is established by using a cohesive contact model. The comparison between the numerical results and the experimental results shows that the two models can be in good agreement, indicating that the calculation model of the interaction between the fiber and the matrix is realistic.