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Stabilizing soft clay using geo-foam beads and cement bypass dust

Underground Space 2020年第4期5卷 292-297页

作者： Essam Farouk Badrawi Mahmoud Samir El-kady Structural Engineering Department Faculty of EngineeringZagazig UniversityEgypt Civil Engineering Department Jouf UniversitySaudi Arabia

Soft clays are usually classified according to their undrained shear strength,*** of Su less than 12.5 kPa are associated with very soft *** addition to their low shear strength,soft clays exhibit high compressibility upon ***,soft clays are considered to be problematic for foundation ***-foam is an industrial material that is characterized by a very low unit weight(20 kg/m^(3) on average)compared to that of the *** density of expanded polystyrene(EPS)ranges from 1.0%to 2.5%,which results in a compressive strength ranging between 70 kPa and 140 kPa and an elastic modulus ranging between 5 MPa and 12 *** geofoam blocks are used in a wide range of geotechnical applications as a lightweight fill *** main objective of this study was to investigate the geotechnical properties of soft clays containing geo-foam beads and cement bypass dust(CBPD).We also investigated the viability of preparing low-strength excavatable fill *** study the effect of(geofoam beads+CBPD)/soft clay on the fluid-state and hardened properties of new fill,we conducted experiments on two groups of mixtures(A&B).Each mixture contained different ratios of geo-foam beads and CBPD so that we could study the effect of the additive on the flow consistency,dry unit weight,unconfined compressive strength,and shear strength of the *** test results showed that the unconfined compressive strength of the studied mixtures without geo-foam ranged from 271.8 kPa to 1405.14 kPa at CBPD concentrations between 3.88%and 18.63%.The cohesion values for the group containing geo-foam ranged from 50 kPa to 20 kPa at geo-foam percentages between 0.32%and 1.35%.The friction angle of the group containing geo-foam ranged from 10 kPa to 22 kPa at CBPD percentages between 0.32%and 1.35%.Cement bypass dust can be successfully used to process self-compacting,self-leveling,excavatable and flowable fill material.

关键词： geo-foam beads Cement bypass dust Flowable fill Shear strength

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