A new approach to stabilization of calcareous dune sand

S. Ghadr, A. Assadi-Langroudi, C. Hung

研究成果: Article同行評審

摘要

Salt lakes are major sources of dust. Formation of natural evaporitic salt crusts can reduce the dust efflux, but protection is dependent on environmental conditions and the mineralogical composition of lakebed deposits. Chemical stabilization with conventional additives can benefit in further reducing the dust efflux. These however disrupt the soils’ biogeochemical cycles which are reliant on intertwining pore networks—a perspective commonly overlooked by engineers. In making provision for an engineered thin, porous, and lightweight crust that limits the dust deflation and preserves the soil’s open structure, this work examines prospects of administrating a mixture of ground rubber (GR) from the waste tire and five grades of mediated colloidal nanosilica (NS) hydrosol to calcareous lake sand. This research presents evidence for interaction between carbonates in the sand and the added NS that yields a matrix of calcium silicate hydrates (C–S–H). It also presents SEM micrographs of novel honeycomb sand-GR open structures bonded with C–S–H units. The resulting sand-GR-NS mat offers reasonable unconfined compressive strength equal to levels seen in sand-NS systems, following a 28-day of curing. The preserved open network of pores functions as an ideal air and water conveyance system. Overall, a NS content in 15–25% mixed with 5% by weight of GR seems to have offered optimal strength and post-peak response.

All Science Journal Classification (ASJC) codes

  • 環境工程
  • 環境化學
  • 農業與生物科學 (全部)

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