![]() The corps has twice this summer dredged the federal navigation channel in the inlet, which connects the Manasquan River to the Atlantic Ocean. The sand has been building up for most of the summer, most likely a result of steady south winds pushing the sand in, according to both fishing boat captains and the U.S. This technique improved the hydraulic conductivity of fine-dredged material and could contribute to the efforts of increasing reuse of waste by-products for engineered fill applications.Shoaling in Manasquan Inlet has created a large sand bar on the Point Pleasant Beach side of the inlet that looked more like a beach during Thursday afternoon’s low tide. This new product, engineered geopolymer soil (EGS), was classified as poorly graded sand (SP) with a hydraulic conductivity at least two orders of magnitude higher than that of the original FDM. ![]() The AAFA cement caused FDM soil particles to flocculate, which led to an increase in particle diameters. To increase the hydraulic conductivity, Class C fly ash, an industrial by-product from the local power plant in Duluth, MN, was activated with a combination of alkaline activator solutions, sodium hydroxide (NaOH) and sodium silicate (Na2SiO3), to generate alkali-activated fly ash cement (AAFA). A sample of fine dredged material (FDM) from the Erie Pier facility in Duluth, MN, was classified as sand lean clay (CL) with a hydraulic conductivity of 6.06 x 10-6 cm/s. This work investigates an engineered solution to the waste materials piling up in a disposal facility in northern Minnesota. Much research has been done on methods of improving hydraulic conductivity through soil improvement techniques available today. Hydraulic conductivity is a vital input parameter when designing foundations, embankments, retaining walls, or roadways.
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