Abstract
This paper focuses on the use of fly ash (FA) or ground granulated blast slag (GGBS) and reactive lime blends for cement-stabilized Nanjing clay, comparing them with Portland cement (PC) for enhanced technical performance. A range of tests were conducted to investigate the properties of stabilized soils, including macrostrength (UCS), permeability, and microstructure analyses by scanning electron microscopy (SEM). The influence of PC : (FA + lime) ratio, PC : (GGBS + lime) ratio and curing time was addressed. The UCS and permeability results revealed that PC-FA-lime was more efficient than PC-GGBS-lime as a binder for soil stabilization, with an optimum proportion of PC : (FA + lime) = 3 : 7 at 25% binder content, varying with curing time. The microstructure analysis reveals that fly ash mainly changes the pore volume distribution, which ranges between 0.01 μm and 1 μm, and produces more CSH/CASH bonding and fissures due to the secondary hydration and pozzolanic reactions. Based on the favourable results obtained, it can be concluded that the soft soils can be successfully stabilized by the combined action of cement, fly ash, and lime. Since fly ash is much cheaper than cement, the addition of fly ash and lime in cement-soil mix may particularly become attractive and can result in cost reduction of construction.
Highlights
Cement soil stabilization to construct vertical barriers, including deep mixing method (DMM) and the trench remixing and deep wall method (TRD) have found increased usage
Since the use of lime for soil stabilization has a long history and been successfully employed in many countries [9,10,11,12,13], the incorporation of lime with fly ash or ground granulated blast furnace slag (GGBS) is accepted for geotechnical applications
The unconfined compressive strength (UCS) of PC-fly ash-lime stabilized clay (PFLC) mixes and PC-GGBS-lime stabilized clay (PGLC) mixes increased with the increasing cement ratio and curing period
Summary
Cement soil stabilization to construct vertical barriers, including deep mixing method (DMM) and the trench remixing and deep wall method (TRD) have found increased usage. An advantage of these techniques was that a high strength can be achieved, making Portland cement (PC) the most commonly used binder in soil stabilization [1, 2]. To reduce the stabilization cost, the incorporation of industrial byproducts in partial or full cement replacement, such as fly ash (FA), ground granulated blast furnace slag (GGBS), has been extensively applied in practice [4, 5]. Since the use of lime for soil stabilization has a long history and been successfully employed in many countries [9,10,11,12,13], the incorporation of lime with fly ash or GGBS is accepted for geotechnical applications
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
