The term expansive soil indicates to soils, which ahs the tendency to swell when their moisture

“Drainage patterns, the hilliness of the ground, the range of soils, the nature of the bedrock,

These are soils consisting predominantly of unaltered mineral material that have no surface/sub-surface horizon attributed to soil forming processes (unless buried under a 730cm thick deposit from the Holocene) (Avery, 1980;). These soils do not normally have continuous vegetation cover (Avery, 1980). They occur in very recently formed soil and may have a superficial organic or organo-mineral layer less than 5cm thick. Sometimes they have a buried horizon below 30cm of depth. (Thompson, 2007; Jarvis, 1984).

Extracted soil samples indicate simultaneous reduction of rainfall and occasional erosion. Both soil and sediment features show establishment of marked

The types of soils found in the state of Texas vary over a wide range. Research done by the Natural Resources Conservation service indicated that there are approximately over 1300 different types of soils that can be located in the State of Texas. All of these soil types each play a different role in how it affects the foundation of structures. However, this wide range of soil types, has been shrunk down to fit into nine groups of Taxonomy to help make it easier for identification and research (Vepraskas et al., 26). In this essay, I shall discuss the different types of soils that can be located in Texas according to their respective taxonomic group.

Thus, in conclusion, this essay has considered: the definition of soil, identifying the components of, and its contribution to soils unique properties, and the critical roles in which soils play to sustain life on Earth. Soil, therefore, coincides with life on our

If you have made some of the mistakes listed below, don't be too hard on yourself because unless you've completed a fair amount of research on the topic, any one of these oversights are easy to make. Before getting to them, some background information on expansive clay soil is necessary.

Due to consolidation with the time, the exiting soil at a construction site may not always be totally suitable for supporting structures. When the time passes they may be inclined, collapsed or cracks can be occurred on walls and slabs. To avoid

Sandy or loamy sands with more than 45% medium/coarse sand (Corbett and Tatler, 1970).The topsoil crumbles easily when it is ploughed and exposed to rain, the upper part of the Bw can become compacted if heavy machinery is used. It requires liming. The cation exchange capacity is low. Freckenham soils with an Ah horizon may have moderate cation exchange capacity. Under

Soil compaction is one of the most important aspects behind many projects as it is the base of almost all structures and without a strong base failure will occur. It is known that most engineering properties improve as the density of the soil increases; also the greatest density for a given soil will occur at the optimum moisture content. This is the reason why accurate Proctor Tests are so important. Without them it would be impossible to know whether the soil on a

Graph 1 shows the failure peak points of the samples. It is important to note that the specimens tested at 100 kN/m2 and 200 kN/m2 reacted similarly, showing similarly shaped graphs to their peak and then descending gradually till they tail off. However, the 3rd specimen showed a steep ascend to it’s failure point and then descends steeply afterward as compared to the first two samples. The constant changes within the first ascending parts of the graph for all samples may be indication of the soil samples settling to the pressure or filling in the

The secondary compression for over consolidated soil is much smaller than that of normally consolidated soil. The secondary settlement can be reduced or even eliminated either by increasing the time of temporary overloading or by using a heavier overload.

Soil texture was evaluated via hydrometer methods (Page et al., 1986). Organic matter (OM) was determined (Walkey and Black, 1934). Cation exchange capacity (CEC) at pH 8.2 was measured (Chapman, 1965). Aggregate stability including mean weight diameter (MWD), geometric mean diameter (GMD), status and degree of aggregation (SOA&DOA), dispersion ratio (DR), was

Soil is a heterogeneous body that shows large variations in most of the properties (physical, chemical and biological). Although many factors and processes of soil formation contribute to the variation in soil properties, time and space are the two most important

(4) As the root cells are directly in contact with soil,they take up ions.due to this, a difference is created between concentration of these ions between the root and the soil.

A REVIEW OF LITERATURE ON EFFECT OF AGRICULTURAL SOLID WASTES ON STABILIZATION OF EXPANSIVE SOIL.