{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T04:56:36Z","timestamp":1790744196077,"version":"4.1.0"},"reference-count":37,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T00:00:00Z","timestamp":1790208000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52479131"],"award-info":[{"award-number":["52479131"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"award":["52479131"],"award-info":[{"award-number":["52479131"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>In light of its curing and green environmental protection effects, the application of an alkali-activated multifunctional curing agent was undertaken for the remediation of silt in coastal areas. In this paper, the curing effect and curing mechanism of cement\u2013phosphogypsum\u2013fly ash\u2013lime as a multifunctional silt curing agent under the action of an alkaline activator were investigated. The effects of alkaline activator dosing and the relative dosing of a multifunctional curing agent on the mechanical and water stability properties of specimens were comparatively analyzed by carrying out unconfined compressive strength and water stability tests. Furthermore, microanalysis was conducted using scanning electron microscopy and energy spectrum analysis (SEM + EDS), X-ray diffraction (XRD), and thermogravimetric analysis (TG) tests. The objective of these analyses was to reveal the curing mechanism of a multifunctional curing agent. The experimental findings indicate that the addition of an alkaline activator enhances the strength of solidified silt, though it exerts minimal influence on the enhancement of water stability. It is recommended that the mass fraction of NaOH in multifunctional curing agent systems be set at 2%, while the mass fraction of phosphogypsum is advised to be 60%. Under this mixing ratio, the hydration products are able to more effectively act as binding agents for soil particles, thereby filling the internal pores and creating a more compact internal structure in the solidified silt. This, in turn, enhances the compressive strength and water stability of the material. The research results can provide a theoretical basis for the application of industrial solid waste in the treatment of silt and for other practical projects.<\/jats:p>","DOI":"10.3390\/ma19194094","type":"journal-article","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T13:26:11Z","timestamp":1790256371000},"page":"4094","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Performance and Mechanism of an Alkali-Activated Multifunctional Curing Agent for Silt Solidification"],"prefix":"10.3390","volume":"19","author":[{"given":"Wei","family":"Zheng","sequence":"first","affiliation":[{"name":"State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, Tianjin University, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Cui","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, Tianjin University, Tianjin 300072, China"},{"name":"Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration, Tianjin University, Tianjin 300350, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Si-Xian","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, Tianjin University, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bei","family":"Tang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, Tianjin University, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian-Guo","family":"Li","sequence":"additional","affiliation":[{"name":"STECOL Corporation, Tianjin 300384, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"138211","DOI":"10.1016\/j.conbuildmat.2024.138211","article-title":"Mechanical properties and microscopic mechanism of dredged silt solidification by slag-chlorine oxygen magnesium cement","volume":"448","author":"Wang","year":"2024","journal-title":"Constr. Build. Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2803","DOI":"10.1007\/s12205-023-1096-7","article-title":"Study on the Mechanical Characteristics of Urban Sludge Solidified by Industrial Waste","volume":"27","author":"Wu","year":"2023","journal-title":"KSCE J. Civ. Eng."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"20220303","DOI":"10.1515\/rams-2022-0303","article-title":"Study on the solidification property and mechanism of soft soil based on the industrial waste residue","volume":"62","author":"Dong","year":"2023","journal-title":"Rev. Adv. Mater. Sci."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"716","DOI":"10.1016\/j.sandf.2018.03.005","article-title":"Effects of industrial by-product based geopolymers on the strength development of a soft soil","volume":"58","author":"Yaghoubi","year":"2018","journal-title":"Soils Found."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1016\/j.clay.2018.10.005","article-title":"Impact of field conditions on the strength development of a geopolymer stabilized marine clay","volume":"167","author":"Yaghoubi","year":"2019","journal-title":"Appl. Clay Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"85","DOI":"10.3208\/sandf.49.85","article-title":"Role of fly ash on strength and microstructure development in blended cement stabilized silty clay","volume":"49","author":"Horpibulsuk","year":"2009","journal-title":"Soils Found."},{"key":"ref_7","first-page":"100195","article-title":"Effect of phosphogypsum on physiochemical and mechanical behaviour of cement stabilized dredged soil from Fuzhou, China","volume":"25","author":"Zeng","year":"2021","journal-title":"Geomech. Energy Environ."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"82","DOI":"10.1016\/j.jhazmat.2008.12.121","article-title":"Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes","volume":"167","author":"Temuujin","year":"2009","journal-title":"J. Hazard. Mater."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"963","DOI":"10.1016\/S0008-8846(02)00734-2","article-title":"Microanalysis of alkali-activated fly ash\u2013CH pastes","volume":"32","author":"Williams","year":"2002","journal-title":"Cem. Concr. Res."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"2958","DOI":"10.1007\/s10853-006-0585-7","article-title":"Opc-fly ash cementitious systems: Study of gel binders produced during alkaline hydration","volume":"42","author":"Palomo","year":"2007","journal-title":"J. Mater. Sci."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"134","DOI":"10.1016\/j.clay.2016.04.005","article-title":"Strength development in soft marine clay stabilized by fly ash and calcium carbide residue based geopolymer","volume":"127","author":"Phetchuay","year":"2016","journal-title":"Appl. Clay Sci."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"120020","DOI":"10.1016\/j.jenvman.2024.120020","article-title":"Effect of recycled phosphogypsum and calcium aluminate cement on the strength behavior optimization of cement\u2014Treated dredged soil: A co-utilization of solid wastes","volume":"353","author":"Zhang","year":"2024","journal-title":"J. Environ. Manag."},{"key":"ref_13","first-page":"1","article-title":"Effects of NaOH and sodium silicate solutions on compressive and shear bond strengths of FA\u2014GBFS geopolymer","volume":"91","author":"Maegawa","year":"2015","journal-title":"Constr. Build. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"106459","DOI":"10.1016\/j.jobe.2023.106459","article-title":"Mechanical characteristics and solidification mechanism of slag\/fly ash-based geopolymer and cement solidified organic clay: A comparative study","volume":"71","author":"Su","year":"2023","journal-title":"J. Build. Eng."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Shi, C., Roy, D., and Krivenko, P. (2003). Alkali-Activated Cements and Concretes, Taylor and Francis.","DOI":"10.1201\/9781482266900"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"130902","DOI":"10.1016\/j.conbuildmat.2023.130902","article-title":"Optimization of synergy between cement, slag, and phosphogypsum for marine soft clay solidification","volume":"374","author":"Li","year":"2023","journal-title":"Constr. Build. Mater."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1680\/grim.900032","article-title":"Deep soft soil improvement by alkaline activation","volume":"164","author":"Cristelo","year":"2011","journal-title":"Proc. Inst. Civ. Eng.-Ground Improv."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"04018171","DOI":"10.1061\/(ASCE)MT.1943-5533.0002363","article-title":"Strength Development of Soil\u2013Fly Ash Geopolymer: Assessment of Soil, Fly Ash, Alkali Activators, and Water","volume":"30","author":"Leong","year":"2018","journal-title":"J. Mater. Civ. Eng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"122917","DOI":"10.1016\/j.conbuildmat.2021.122917","article-title":"Microstructural evolution and mechanical behaviour of alkali activated fly ash binder treated clay","volume":"285","author":"Coudert","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"129161","DOI":"10.1016\/j.jclepro.2021.129161","article-title":"Valorization of phosphogypsum as a road material: Stabilizing effect of fly ash and lime additives on strength and durability","volume":"323","author":"Meskini","year":"2021","journal-title":"J. Clean. Prod."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1007\/s43452-024-01067-5","article-title":"Active learning on stacked machine learning techniques for predicting compressive strength of alkali-activated ultra-high-performance concrete","volume":"25","author":"Kazemi","year":"2025","journal-title":"Arch. Civ. Mech. Eng."},{"key":"ref_22","unstructured":"(2011). Specification for Mix Proportion Design of Cement Soil (Standard No. JGJ-T233-2011)."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"302","DOI":"10.1016\/j.conbuildmat.2018.03.049","article-title":"Experimental investigation of using a recycled glass powder-based geopolymer to improve the mechanical behavior of clay soils","volume":"170","author":"Bilondi","year":"2018","journal-title":"Constr. Build. Mater."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1977","DOI":"10.1016\/j.jrmge.2022.01.003","article-title":"Plasticity role in strength behavior of cement-phosphogypsum stabilized soils","volume":"14","author":"Bian","year":"2022","journal-title":"J. Rock Mech. Geotech. Eng."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"118198","DOI":"10.1016\/j.conbuildmat.2020.118198","article-title":"Effect of calcium sulphoaluminate cement on mechanical strength and waterproof properties of beta-hemihydrate phosphogypsum","volume":"242","author":"Jin","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"136392","DOI":"10.1016\/j.conbuildmat.2024.136392","article-title":"Contrastive study on mechanical and microstructure properties of silt improved by nano material stabilizers","volume":"429","author":"Li","year":"2024","journal-title":"Constr. Build. Mater."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"65","DOI":"10.1080\/1064119X.2019.1677827","article-title":"Effects of fly ash and slag content on the solidification of river-dredged sludge","volume":"39","author":"Liu","year":"2021","journal-title":"Mar. Georesour. Geotechnol."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Wen, F., Fan, Y., Wu, J., and Yao, W. (2024). Analysis of the Mechanical Properties of Cured Sludge by Alkaline Excitation of Phosphogypsum. Buildings, 14.","DOI":"10.3390\/buildings14030646"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1016\/j.jhazmat.2017.07.067","article-title":"High calcium fly ash geopolymer stabilized lateritic soil and granulated blast furnace slag blends as a pavement base material","volume":"341","author":"Phummiphan","year":"2018","journal-title":"J. Hazard. Mater."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1358","DOI":"10.1016\/j.sandf.2018.07.005","article-title":"Evaluation of fly ash- and slag-based geopolymers for the improvement of a soft marine clay by deep soil mixing","volume":"58","author":"Arulrajah","year":"2018","journal-title":"Soils Found."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1468","DOI":"10.1016\/j.conbuildmat.2013.06.017","article-title":"Experimental feasibility study of geopolymer as the next-generation soil stabilizer","volume":"47","author":"Zhang","year":"2013","journal-title":"Constr. Build. Mater."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"120469","DOI":"10.1016\/j.conbuildmat.2020.120469","article-title":"Experimental study on material ratio and strength performance of geopolymer-improved soil","volume":"267","author":"Wang","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"122111","DOI":"10.1016\/j.conbuildmat.2020.122111","article-title":"Strength evolutions of varying water content-dredged sludge stabilized with alkali-activated ground granulated blast-furnace slag","volume":"275","author":"Lang","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"105849","DOI":"10.1016\/j.mineng.2019.105849","article-title":"Sulphate induced changes of rheological properties of cemented paste backfill","volume":"141","author":"Peng","year":"2019","journal-title":"Miner. Eng."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"117195","DOI":"10.1016\/j.conbuildmat.2019.117195","article-title":"Loess stabilization using cement, waste phosphogypsum, fly ash and quicklime for self-compacting rammed earth construction","volume":"231","author":"Gu","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"117538","DOI":"10.1016\/j.conbuildmat.2019.117538","article-title":"Effect of stabilization\/solidification on mechanical and phase characteristics of organic river silt by a stabilizer","volume":"236","author":"Pan","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"126072","DOI":"10.1016\/j.jclepro.2021.126072","article-title":"Strength, durability and microstructure of granulated blast furnace slag-modified magnesium oxychloride cement solidified waste sludge","volume":"292","author":"Wang","year":"2021","journal-title":"J. Clean. Prod."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/19\/4094\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T04:11:25Z","timestamp":1790741485000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/19\/4094"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,24]]},"references-count":37,"journal-issue":{"issue":"19","published-online":{"date-parts":[[2026,10]]}},"alternative-id":["ma19194094"],"URL":"https:\/\/doi.org\/10.3390\/ma19194094","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,24]]}}}