RT info:eu-repo/semantics/article
T1 Strength performance of low-bearing-capacity clayey soils stabilized with ladle furnace slag
A1 Espinosa González, Ana Belén
A1 Revilla Cuesta, Víctor
A1 Skaf Revenga, Marta
A1 Serrano López, Roberto
A1 Ortega López, Vanesa
K1 Soil stabilization
K1 Ladle furnace slag
K1 Clayey soil
K1 Bearing capacity
K1 Recycling
K1 Road construction
K1 Ingeniería civil
K1 Civil engineering
K1 Materiales de construcción
K1 Building materials
AB In this paper, the performance of ladle furnace slag (LFS), a by-product of secondary steel refning, is evaluated as a binderto stabilize clayey soils of low bearing capacity. The aim is to defne whether additions of this by-product to clayey soil canstabilize the soil in accordance with the technical specifcations of Spanish standards. To do so, three diferent soils stabilizedwith 5% LFS were compared with the same soils stabilized with 2% lime and with no stabilization, in order to investigatetheir diferent behaviors. The chemical and mineralogical characterizations of all the soil mixes were conducted using X-rayfuorescence, X-ray difraction, and scanning electron microscopy. The Atterberg limit test was used to study the plasticbehavior of the soils, and the results of compaction, bearing capacity, unconfned compressive strength, and direct shearstrength (cohesion and friction angle) tests defned their strength characteristics. The analysis was completed with the pHmonitoring of the mixes along the curing time in order to relate the pH changes with the strength evolution. The additionof LFS to the soils has resulted in an increase in the liquid limit and plastic limit, causing therefore a slight decrease in theplasticity index. All the soils showed increases between 30% and 70% in their California Bearing Ratios immediately aftermixing with 5% LFS, and after 90 days of curing, improvements of 30–188% in their unconfned compressive strength werenoted in comparison with untreated soil, which were higher than the lime-stabilized soils. The cohesion of soils stabilizedwith LFS at 28 days of curing obtained improvements ranging from 40 to 300% depending on the type of soil. However, thefriction angle showed a slight increase of 10% in two of the soils and zero in another. The high initial pH in LFS-stabilizedsoils was maintained during the curing time, which favored the development of pozzolanic reactions that improve the soilstrength. These results confrmed that the substitution of lime with LFS is a feasible option for soil stabilization.
PB Springer Nature
YR 2023
FD 2023-08
LK http://hdl.handle.net/10259/8011
UL http://hdl.handle.net/10259/8011
LA eng
DS Repositorio Institucional de la Universidad de Burgos
RD 11-may-2024