Abstract
When combined with portland cement and compacted, fly ash is a high-strength material. In some instances, it may also be desirable to control the hydraulic conductivity ( k) of the compacted mixture. Therefore, a study was performed to assess the effects of water content ( w), cement content, curing time, and compaction effort on the hydraulic conductivity of compacted cement–stabilized fly ash. When compacting relatively dry mixtures ( w < 20%), k is independent of compaction effort, and is on the order of 10 −5 cm/s. When compacting between w of 20% and optimum water content ( w opt), compaction effort affects k, and, at a given w, k decreases by about an order of magnitude when increasing from standard to modified proctor effort. When wet of w opt, k is on the order of 10 −6 cm/s regardless of compaction effort or water content. With respect to curing time, extended curing time has relatively little effect on k within a 60-day time frame. Based on the results of this study, an approach to construction quality assurance testing can be applied to estimate k based on in situ measurement of dry density ( ρ d) and w.
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