2026-10-11T21:30:46Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33956392 2026-09-21T17:31:52Z category_1 category_4 category_12 category_272 category_39 category_734 portal_5 item_type_3 month_year_09_2026

<p>Main chemical components of phosphogypsum.</p> Lin Qin (753537) Jie Li (15030) Fusheng Zha (16982025) Long Xu (218743) Bo Kang (3897697) Biophysics Biochemistry Cell Biology Environmental Sciences not elsewhere classified Ecology Biological Sciences not elsewhere classified unconfined compressive strength systematic laboratory tests significant environmental burdens mip analyses reveal expansive soil stabilized lsp stabilized soil lsp reduces fsi pg powder constitutes soil engineering properties permeability increases 1 lsp obtains pg ). engineering performance wetting cycles study proposes shrink potential results indicate primary mechanism physical filling high cost geotechnical indexes experimental study deterioration induced controlled mechanism 15 cycles <div><p>Conventional binders to treat expansive soil commonly present challenges of high cost and significant environmental burdens. To address these limitations, this study proposes an environmentally sustainable binder termed LSP (lime-sodium silicate amended phosphogypsum) based on the valorization of phosphogypsum (PG). Systematic laboratory tests were conducted to evaluate the engineering performance of LSP stabilized soil under drying-wetting cycles. Results indicate that the expansive soil stabilized with LSP obtains a higher maximum dry density and a lower optimum moisture content. The swelling-shrink potential is weakened as well. However, the successive D-W cycles imposes detrimental impacts on the development of all the geotechnical indexes, including free swelling index, unconfined compressive strength (UCS), shear strength, compressibility and permeability. LSP reduces FSI from 58.6% to 32.1%; UCS decreases by 26.5% after 15 cycles; permeability increases 1.65-fold. XRD and MIP analyses reveal that physical filling by PG powder constitutes the primary mechanism for the improvement of soil engineering properties, while micro-crack development is the controlled mechanism for the deterioration induced by D-W cycles.</p></div> 2026-09-21T17:31:37Z Dataset Dataset 10.1371/journal.pone.0358749.t002 https://figshare.com/articles/dataset/_p_Main_chemical_components_of_phosphogypsum_p_/33956392 CC BY 4.0