1. The document presents the shear strength characteristics of a low-lime Class F fly ash modified with lime alone or in combination with gypsum through unconfined compression and triaxial tests.
2. Addition of small amounts of gypsum (0.5-1%) along with lime (4-10%) enhanced the shear strength of the modified fly ash within short curing periods of 7-28 days.
3. The cohesion of the Class F fly ash increased up to 3,150% with addition of 10% lime and 1% gypsum after 28 days of curing.