Soil Stabilisation Using Pond Ash And Alcofine
Keywords:
Pond ash, Alcofine, Natural Soil, CBRAbstract
Need for locally produced building materials is developing in third-world nations as a result of the increased demand for new roads and apartment units brought on by a growing population.. Over the years, the availability of conventional material has not been sufficient to meet the demand of growing population. However, using conventional methods and procedures would require significant financial outlays in order to create a vast network of roadways. According to Road Note 31 (TRRI, 1977), the values of UCS for both BSL and WAS were insufficient to stabilise the commercial range of the OPC. For base courses of pavers, the UCS value of the BSH compaction, however, can be acceptable. The OPC/ALCCOFINE mix provides a long-term benefit in terms of strength increase, as seen by the 28-day curing period UCS values that were attained. The values of UCS significantly increased from their initial conditions.. The 28 days curing period UCS produced a peak value of 2616kN/m2 at 30% pond ash & 3% alccofine for BSH compaction, showing that the soil treated With this mixture, base school curriculum for paving can be utilised (during BSH compaction).. The unsoaked CBR values of 5, 7 and 11% (for the natural soil) compacted with BSL, WAS and BSH energy efforts, respectively, increased to 46, 77 and 83% at 30% pond ash & 3% alccofine. The 24 hours soaked CBR values recorded peak values of 42, 66 and 66% with BSL, WAS, BSH energies, respectively, which showed about 10-15% decrease from the unsoaked CBR values. The CBR values of 66% with BSH compaction at 30% pond ash & 3% alccofine blend can be used as sub base material because it meets the 29% recommended values specified in the Nigerian General Specification for Sub-Base (1997).resistance to loss in strength (Ola, 1983) based on 4 days soaking. The 6% OPC 6% ALCCOFINE treatment of the soil can be used, at BSH compaction, for sub-base material because the soil was subjected to a harsher condition (of 7 days soaking) and due to the time dependent gain in strength advantage of the pozzolana Also the 42% recorded with BSL compaction at 30% pond ash & 3% alccofine treatment meets the 15% recommended for subgrade material by the Nigerian
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