Effects of Curing Temperature on Sand-Ash-Lime Mixtures with Fibres and NaCl

• Published in: Geotechnical and geological engineering 2023-05, Vol.41 (3), p.2221-2235
• Main Authors: Godoy, Vinícius Batista, Tomasi, Lennon Ferreira, Benetti, Mozara, de Araújo, Mariana Tonini, Dalmolin, Diego Anderson, Heineck, Karla Salvagni
• Format: Article
• Language: English
• Subjects: Acceleration; Civil Engineering; Compression; Compressive strength; Curing; Curing (processing); Dry weight; Ductile-brittle transition; Durability; Earth and Environmental Science; Earth Sciences; Fiber reinforced materials; Fibers; Fly ash; Freeze thaw cycles; Freeze-thaw durability; Freeze-thawing; Freezing; Geotechnical Engineering & Applied Earth Sciences; Hydrogeology; Mixtures; Pavement design; Pavements; Polypropylene; Porosity; Rupture; Sand; Sodium; Sodium chloride; Soil compaction; Soil lime; Soil porosity; Soil stabilization; Soil temperature; Statistical analysis; Statistical methods; Stiffness; Technical Note; Temperature; Terrestrial Pollution; Thawing; Toughness; Waste Management/Waste Technology
• ISSN: 0960-3182; 1573-1529
• DOI: 10.1007/s10706-023-02386-9

The acceleration of pozzolanic reactions, via increasing curing temperature, has practical applications for soil stabilization at geotechnical sites (e.g. pavement layers). In this context, this research aims the following: to evaluate the influence of curing temperature (23°C and 40°C) on a fibre reinforced Osorio sand mixed with fly ash, lime and sodium chloride (NaCl) by measuring freezing and thawing cycles, stiffness and unconfined compressive strength; to determine statistically the influence of lime content, NaCl, polypropylene fibres and dry unit weight (γ d ) over the measured response variable for both curing temperatures; and to expand pavement design methodologies by correlating durability, strength and stiffness with the porosity/binder index [η/(B iv ) 0.28 ]. Regardless of curing temperature the specimen stiffness presented a typical behavior: fibres decreased the mixture stiffness while NaCl increased it. For mixtures without fibres the rupture was brittle, while mixtures with fibres had ductile rupture. Statistical analysis showed that increased compaction (γ d of 14kN/m 3 , 15kN/m 3 and 16kN/m 3 ) improved all response variables (unconfined compression strength, stiffness at slight strain modulus and freeze–thaw durability). However, better results were achieved with the temperature increment in the curing process.