The potential of Wastepaper Sludge Ash (WSA), an industrial by-product of the recycling of paper, as a soil stabilizer is reported. Lower Oxford Clay (LOC), a sulfate-bearing clay, was stabilized with quick-lime ((CaO) at typical dosages of 2, 4 and 6%) and with various blended stabilizers incorporating WSA (at 10, 15 and 25% stabilizer dosages). Compacted cylinder specimens were made with and without allowing for a 3-day mellowing period prior to compaction. They were then cured for up to 365 days and then tested for compressive strength development. Linear expansion measurements were also taken for a period of up to 100 days. The results indicate that the strength values of systems incorporating WSA are generally higher than those utilizing traditional quick-lime. For all the stabilizers in the current investigation, strength values of the unmellowed specimens are also higher than for the mellowed specimens at all curing periods.
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