| A series of resonant column tests (RC, ASTM D 4015-92) were conducted on several chemically stabilized specimens of high-plasticity, sulfate-rich expansive clay from southeast Arlington, Texas. Test results were used to assess the influence of cyclic wetting-drying on dynamic properties of treated soil. Specimens were tested for different stabilizer types, stabilizer dosages, compaction moisture contents, confining pressures, and number of wetting-drying cycles (0--32 cycles).; In this work, three novel chemical stabilizers were used: (1) Sulfate resistant "Type V" cement, (2) Low calcium "Class F" fly ash, and (3) Lime mixed with polypropylene fibers. Soil's dynamic properties investigated include low-strain shear modulus (Gmax) and material damping ratio (Dmin). A 10%-by-weight dosage of sulfate resistant "Type V" cement appears to yield best soil performance under cyclic wetting-drying, whereas low calcium "Class F" fly ash presents worst performance. |
