Some studies on the effect of fly ash and lime on physical and mechanical properties of expansive clay

Fly ash is one of the most plentiful and versatile of the industrial by-products. At present, nearly 150 million tonnes of fly ash is being generated annually in India posing dual problem of environmental pollution and difficulty in disposal. This calls for establishing strategies to use the same effectively and efficiently. However, it is only in geotechnical engineering applications such as the construction of embankments/dykes, as back fill material, as a sub-base material etc., its large-scale utilization is possible either alone or with soil. Soil stabilization can be achieved by various means such as compaction, soil replacement, chemical improvement, earth reinforcement etc. Usually, in the case of clay soils, chemical improvement is commonly most effective since it can strengthen the soil, to remove its sensitivity both to water and its subsequent stress history. Among chemical means or additives, fly ash/lime provides an economic and powerful means of improvement, as demonstrated by the significant transformation that is evident on mixing with heavy clay. In the present investigation, different percent fly ashes (10%, 20%, 40%, 60% & 80%) were added to a highly expansive soil from India by dry weight of the natural soil, and subjected to various tests. The important properties that are necessary for using fly ash in many geotechnical applications are index properties, compaction characteristics, compressibility characteristics, permeability and strength. Based on test results, it has been found that using fly ash for improvement of soils has a two-fold advantage. First, to avoid the tremendous environmental problems caused by large scale dumping of fly ash and second, to reduce the cost of stabilization of problematic/marginal soils and improving their engineering properties for safe construction of Engineering Structures.

[1]  Robert Turgeon FLY ASH FILLS A VALLEY , 1988 .

[2]  A. Sridharan,et al.  CLASSIFICATION PROCEDURES FOR EXPANSIVE SOILS , 2000 .

[3]  B. Phanikumar Effect of lime and fly ash on swell, consolidation and shear strength characteristics of expansive clays: a comparative study , 2009 .

[4]  M. Mohanty Stabilization of Expansive Soils Using Fly Ash , 2015 .

[5]  Arvind Kumar,et al.  Influence of Fly Ash, Lime, and Polyester Fibers on Compaction and Strength Properties of Expansive Soil , 2007 .

[6]  D. Uppal,et al.  A RESUME OF THE USE OF FLY ASH IN SOIL STABILIZATION , 1968 .

[7]  J. S. Browning,et al.  Properties and Use of Fly Ashes for Embankments , 1990 .

[8]  G. Sowers REVIEW OF EXPANSIVE SOILS , 1975 .

[9]  S. Esterby American Society for Testing and Materials , 2006 .

[10]  N. Pandian,et al.  Studies of the Specific Gravity of Some Indian Coal Ashes , 1998 .

[11]  Buddhima Indraratna,et al.  Stabilization of a dispersive soil by blending with fly ash , 1991, Quarterly Journal of Engineering Geology.

[12]  J G Laguros,et al.  USE OF CLASS C FLY ASHES FOR THE STABILIZATION OF AN EXPANSIVE SOIL. DISCUSSION AND CLOSURE , 2001 .

[14]  A. Sridharan,et al.  Effect of fly ash on the unconfined compressive strength of black cotton soil , 1997 .

[15]  L. Hoyos,et al.  Fiber and fly ash stabilization methods to treat soft expansive soils , 2001 .

[16]  R. Sharma,et al.  Volume Change Behavior of Fly Ash-Stabilized Clays , 2007 .

[17]  A. Sridharan,et al.  Volume change behavior of clayey soil–fly ash mixtures , 2014 .

[18]  A. Sridharan,et al.  Physical and Compaction Behaviour of Clay Soil–Fly Ash Mixtures , 2013, Geotechnical and Geological Engineering.

[19]  W. G. Holtz,et al.  Engineering Properties of Expansive Clays , 1956 .

[20]  F. Zha,et al.  Behavior of expansive soils stabilized with fly ash , 2008 .

[21]  N. L. P. Andian Fly ash characterization with reference to geotechnical applications , 2005 .

[22]  J. M. Kate Strength and Volume Change Behavior of Expansive Soils Treated with Fly Ash , 2005 .

[23]  Zalihe Nalbantoglu,et al.  Effectiveness of Class C fly ash as an expansive soil stabilizer , 2004 .

[24]  A. R. Jumikis Foundations on Expansive soils , 1978 .