In most soils encountered in engineering construction, 4% sodium hexametaphosphate 10ml can be used as dispersant. For a few special soils, such as some fluvial alluvial soils and some industrial polluted soils, the dispersion effect of sodium hexametaphosphate is very poor. Ammonia water can be used as the dispersant. The method is to add 1ml ammonia water respectively during soil boiling and before densimeter test mixing.<br>
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