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DTH defines it select fill as any dirt fill material that is being used in an application that has certain specifications required by a soils engineer. Generally, most select fill used underneath concrete foundations or paving must have a low to medium plasticity index (PI) to replace or mitigate highly expansive clays which are common in the Houston area. Most select fill soils are qualified prior to and during placement by the project owner’s soils engineer on a job by-job basis by means of sampling the material at the source or at the job site.
Sand Material is an unprocessed/unwashed material mined from multiple locations in the Greater Houston Area. Generally, sand will meet specifications which require that no more than 15% of the sand pass through a #200 sieve meaning that the sand is relatively free of fine grained silts and clays. However, being that it is an unprocessed/unwashed product it is not uncommon to find 10 some clay clods, silt, or other impurities in small amounts. Sand is ordered as “bank sand” for bedding water lines or other.
Stabilized Sand is a product created by means of mixing varying amounts of cement, water, and sand in a pugmill. Typically, this product is used as bedding nd back-fill for underground utilities, highway retaining walls as well as many other applications where certain compressive strength specifications are required.