Ramachandra Phanikumar

Expansive soils are highly problematic by virtue of their innate capacity to undergo volume changes such as swelling and shrinkage respectively corresponding to water absorption and water evaporation. This alternate swelling and shrinkage causes distress in the structural members of lightly loaded civil engineering infrastructure such as buildings, pavements and canal linings. Chemical stabilisation is one of the viable techniques to control these volume changes of expansive soils. This book deals with lime stabilisation and pond ash stabilisation of a remoulded expansive clay. Laboratory tests were performed on the clay blended with varied amounts of lime and pond ash in different series of tests. Swelling and compressibility characteristics were evaluated.

Expansive soils are highly problematic by virtue of their innate capacity to undergo volumetric changes such as swelling ans shrinkage based on changes in water content. As a result, lightly loaded civil engineering infrastructure founded in these soils get severely distressed. Chemical stabilisation is one the many innovative foundation practices suggested for reducing the above-mentioned volumetric changes. This book is on stabilisation of a remoulded expansive soil with pond ash. Swelling and compressibility characteristics were studied at varied amounts of pond ash.

This book presents experimental data on LL, PL, PI, compaction characteristics, stress-strain characteristics and unconfined compressive strength (UCS) of a lateritic soilstabilized with varying amounts of cement and GGBS. Cement and GGBS were independently added to the lateritic soil up to 20% in increments of 5%. LL and PI respectively decreased by 23.5% and 49.5% when cement content increased from 0% to 20%. In a similar manner, when GGBS content increased from 0% to 20%, LL and PI respectively decreased by 16% and 30%. Further, MDD increased respectively by 11% and 5% when cement content and GGBS content increased from 0% to 20%. The unconfined compressive strength (UCS) of the cement-soil blends and the GGBS-soil blends increased with increasing additive content. Moreover, for a given additive content, UCS increased significantly with increasing curing period.Chemical stabilization of soils is an effective method of improving their engineering behavior. Through chemical stabilization, the shear strength improves, bearing capacity increases and settlements decrease.

Expansive soils are highly problematic by virtue of their innate capacity to undergo volumetric changes corresponding to changes in moisture content. These soils can be identified by their index properties sch as free swell index and liquid limit and plasticity index. This book is an experimental work on the effect of pozzolanic additives such as lime, cement, fly ash and pond ash on the index properties of expansive soils. Significant index properties such as liquid limit, plastic limit, plasticity index and free swell index were studied at varied amounts of lime, calcium chloride, cement, fly ash, pond ash and GGBS.

Expansive clay absorb water and swell, and lose water to atmosphere and shrink. Because of this alternate swelling and shrinkage, lightly loaded civil engineering structures are distressed. This has resulted in a huge financial loss. Hence, it is and important to devise innovative foundation techniques in order to counteract the volumetric changes occurring in expansive soils. The various foundation techniques which have been in vogue are physical and chemical alteration methods and tension resistant foundations. Tension-resistant foundation techniques are innovative techniques in which tensile forces generated through the process of swelling are counteracted through introduction of deep or anchor foundations. This book is a work on a parametric study of tension-resistant foundations.