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Stiles Mining Resource-Custom Soil Resource Report for <br /> Asphalt Specialties Co., Inc. <br /> or very sandy soils are the least susceptible. Frost heave and low soil strength <br /> during 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 on 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 <br /> in installations that intersect soil boundaries or soil layers is more susceptible to <br /> corrosion than the steel or concrete in installations that are entirely within one kind <br /> of soil or within 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 low, moderate, or high. It is <br /> based on soil texture, acidity, and amount of sulfates in the saturation extract. <br /> 37 <br />