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Expansive soils are highly problematic by virtue of their innate capacity to undergo volume changes corresponding to changes in moisture regime. They swell and shrink respectively when water is absorbed in rainy seasons and when water evaporates in summers. As a result, lightly loaded civil engineering infrastructure founded in these soils are severely damaged. Many innovative foundation practices have been suggested for mitigating the problem...

Swelling characteristics of expansive soils, namely, swell potential and swelling pressure depend on various parameters such as initial water content, dry unit weight and surcharge pressure. It is important to correctly understand the effect of these parameters on swelling characteristics. This paper discusses the effect of surcharge pressure on swelling characteristics of expansive soils. Swell potential, swelling pressure and rebound were st...

This research explores the efficacy of use of random oriented geofiber reinforcement in controlling swell shrink behaviour of expansive soil. The effect of fiber content (fc), which was varied as 0.25% and 0.50% on rate of heave, swell potential and swelling pressure was studied in the case of oedometer samples(diameter = 60mm, height = 20mm). Moreover, the effect of the aspect ratio (length to width ratio of geofiber) which was varied as 3, 6...

This monograph presents is a parametric study on the collapse behaviour of a lateritic silt. Collapsible soils are problematic by nature. They undergo collapse or a sudden settlement or subsidence under a given stress when their water content is increased. Collapse can also occur at a constant water content when the applied stress is increased. Collapse takes place in these soils mainly because their structure becomes unstable and collapses. C...

Expansive soils are highly problematic by virtue of their innate capacity to undergo volume changes corresponding to changes in moisture regime. They swell and shrink respectively when water is absorbed in rainy seasons and when water evaporates in summers. As a result, lightly loaded civil engineering infrastructure founded in these soils are severely damaged. Many innovative foundation practices have been suggested for mitigating the problem...

This book presents experimental data on fly ash obtained from a thermal power station. Lime was used as a blend material to study its effect on various engineering properties of fly ash. Proctor compaction tests, unconfined compression tests and Proctor needle penetration tests were performed on lime-fly ash blends. Effect of curing on unconfined compressive strength was also studied. Addition of lime to fly ash decreased the maximum dry densi...

This book is an experimental work on clay-fly ash blends. Laboratory tests were performed on fly ash- clay blends to study the influence of amount of fly ash on compaction characteristics of the blends, varying the amount of fly ash. Further, the effect of increasing compaction energy on compaction characteristics of unblended clay was also studied varying the number of blows per layer. As fly ash is known to be a stabilizing agent, an attempt...

Shear strength of soils is an important engineering aspect because shear strength characteristics are widely used in various applications such as bearing capacity and earth pressure of soils. Shear strength of sands is somewhat simpler than that of clays, which are complex materials exhibiting engineering behaviour difficult to predict. Shear strength of clays depends of water content, drainage conditions, rate of loading and degree of compact...

River sands, which are natural coarse-grained materials, have been generally used extensively in civil engineering construction, either as a component of concrete or as geotechnical infrastructure such as cushion materials and embankment materials. However, recently, manufactured or M-sands are also being used in civil engineering construction. These M-sands are produced through manufacturing processes from some parent rocks which are crushed ...

Expansive soils are problematic in nature by virtue of their innate capacity to undergo volume changes when there are changes in moisture regime. These soils swell when they absorb water and shrink when water evaporates from them. So, lightly loaded civil engineering structures founded in these soils are subjected to alternate swelling and shrinkage in rainy and summer seasons. As a result, they experience unsightly cracking. The structural me...

Expansive soils are highly problematic soils as they swell or increase in their volume when they absorb water and shrink when water evaporates from them. Hence, lightly loaded civil engineering structures founded in these soils develop unsightly cracks, causing severe financial loss. For mitigating this problem many innovative foundation techniques have been devised. Some of them are physical and chemical alteration, drilled and belled piers, ...

The total amount of settlement that a structure founded on a clay soil undergoes comprises of immediate (or elastic) and consolidation settlements. In the case of clay soils, amount of consolidation settlement (Sc) is more than that of immediate or elastic settlement (Se). Hence, it is important to correctly estimate the amount of consolidation settlement (Sc). The parameters that influence consolidation settlement of a field soil are initial ...

Pile foundations are an example of deep foundations. They are long columnar members driven into earth to support civil engineering structures. They are preferred when the soil at shallow depths is weak and has poor bearing capacity. Based on the material used for manufacturing piles, they are classified as steel piles, concrete piles and timber piles, and based on their function they are generally classified as end bearing piles and friction p...

Expansive soils are highly problematic by virtue of their innate capacity to undergo volume changes corresponding to changes in moisture regime. They swell and shrink respectively when water is absorbed in rainy seasons and when water evaporates in summers. As a result, lightly loaded civil engineering infrastructure founded in these soils are severely damaged. Many innovative foundation practices have been suggested for mitigating the problem...