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Ref. Page No.M2009-006 00107 <br /> Custom Soil Resource Report <br /> saturated hydraulic conductivity (Ksat), content of organic matter, and depth to the <br /> water table are the most important factors considered in evaluating the potential for <br /> frost action. It is assumed that the soil is not insulated by vegetation or snow and is <br /> not artificially drained. Silty and highly structured, clayey soils that have a high-water <br /> table in winter are the most susceptible to frost action. Well drained, very gravelly, <br /> or very sandy soils are the least susceptible. Frost heave and low soil strength during <br /> thawing cause damage to pavements and other rigid structures. <br /> Risk of corrosion pertains to potential soil-induced electrochemical or chemical <br /> action that corrodes or weakens uncoated steel or concrete. The rate of corrosion of <br /> uncoated steel is related to such factors as soil moisture, particle-size distribution, <br /> acidity, and electrical conductivity of the soil. The rate of corrosion of concrete is <br /> based mainly or. the sulfate and sodium content, texture, moisture content, and <br /> acidity of the soil. Special site examination and design may be needed if the <br /> combination of factors results in a severe hazard of corrosion. The steel or concrete in <br /> installations that intersect soil boundaries or soil layers is more susceptible to corrosion <br /> than the steel or concrete in installations that are entirely within one kind of soil or within <br /> one soil layer <br /> For uncoated steel, the risk of corrosion, expressed as low, moderate, or high, is <br /> based on soil drainage class, total acidity, electrical resistivity near field capacity, <br /> and electrical conductivity of the saturation extract. <br /> For concrete, the risk of corrosion also is expressed as/ow, moderate, or high. It is <br /> based on soil texture, acidity, and amount of sulfates in the saturation extract. <br /> Rest of page intentionally left blank. <br />