Stabilized soil is, in general, a composite material that results from combination and optimization of properties in individual constituent materials. Well-established techniques of soil stabilization are often used to obtain geotechnical materials improved through the addition into soil of such cementing agents as Portland cement, lime, asphalt, etc. Replacement of natural soils, aggregates, and cement with solid industrial by-product is highly desirable. In some cases, a by-product is inferior to traditional earthen materials. Due to its lower cost, however, it makes an attractive alternative if adequate performance can be obtained. In other cases, a by-product may have attributes superior to those of traditional earthen materials. Often selected materials are added to industrial by-products to generate a material with well-controlled and superior properties.

Tropical shorelines are often occupied by stretches of mangrove forests. Despite the wide range of ecological and socio-economic benefits provided by mangrove ecosystem (Lewis, 2005; Bosire et al., 2008), over the past decades the mangrove hasbecomea plant in peril. The area of the world's mangrove forests has decreased by 35% during the last two decades of the 20th century (Valiela et al., 2001). Vast areas of mangrove forests have been cleared for urban development, industrialisation, agricultural land reclamation, timber and charcoal production and shrimp farming. Mangrove forests

One of the most important problems in the coastal areas all over the world is erosion which has threatened human activities in the areas exposed to such hazard. Coastline retreat could result in very serious economic, environmental, and social impacts depending on the eroded area.

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