We have a large site with a substantial amount of silty clay (some sand) soil that needs to be reused onsite, however it is currently well above optimum moisture for compaction. The soil is currently in a number of stockpiles and we've thoroughly measured it's moisture throughout (~25%). We do not have the space nor the time to spread it and wait for it to dry, and therefore we are looking to use quicklime to reduce the moisture content to a compactible level. What I'm wondering is how to quantify how much quicklime will be required to reduce the moisture by a certain amount (for example to 15% from 25%). I understand that there are a number of processes occurring that change both the moisture content and the optimum moisture for compaction. Looking at it solely as a chemical reaction it seems like each kilogram of water would require about 3 kg of CaO to fully react. Does this seem accurate? Do the evaporative effects of the exothermic reaction play a major role in the moisture reduction?
And as a final note, there is likely to be a substantial amount of sulphur in the soil. I'm unsure if this would also affect the reaction and stabilization process.
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