Abstract
Circulating fluidized bed slag (CFBS) is an industrial waste produced by coal combustion in power plants. To explore the application of CFB slag in cement-stabilized bases, this paper studies the influence of different dosage of CFBS on the mechanics, water stability, and shrinkage of cement-stabilized soil using laboratory experiments. The hydration activity and interface morphology of CFBS in cement-stabilized clay were observed using XRD and SEM. The improvement mechanism of CFBS on the performance of cement-stabilized clay was revealed. The results indicated that, compared with cement-stabilized clay, cement–CFBS-stabilized clay exhibited better mechanical and water stability, and significantly inhibited the shrinkage deformation of cement-stabilized clay. When the addition of CFBS was 70%, cement–CFBS-stabilized clay had the best mechanics and durability. Microscopic tests show that CFBS contains more active silicon aluminum oxide, which is easily dissolved and the hydration of which produces more gel products, so the mixture structure is denser, the strength is improved, and water does not easily evaporate; it has the characteristics of micro expansion which compensates for dry shrinkage deformation.
Highlights
Since the 20th century, cement-stabilized clay has been widely used in pavement bases and sub-bases, as cement greatly improves the mechanical properties of semirigid bases, as well as the deformation resistance, permeability, and durability of pavement structures [1,2,3]
It is of great significance to conduct in-depth research on improving the strength and water stability, shrinkage of cement-stabilized clay [7,8]
Thison shows that the water hydration products generated performance of cement stabilized clay were studied
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. There are many studies on industrial waste and cement to stabilize base materials These studies on the properties of cement-stabilized base materials mainly include the following three improvement mechanisms: (1) The micro-aggregate effect: Small particle-size aggregates filled soil particle pores; for example, the stiffness of cementstabilized clay can be improved by using the particle characteristics of sand [9]. (2) The volcanic ash reaction: Reaction of active components with calcium hydroxide to produce hydrated calcium silicate, hydrated calcium aluminate, improving the connection among particles Industrial waste, such as magnesium slag, sintered limestone, domestic waste incinerator slag, and CFB-fly-ash [10,11], mainly rely on the hydration reaction of their active components to produce more cement products, thereby improving the characteristics of cement-stabilized base materials. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to reveal the improvement principle of CFBS on cement-stabilized clay, from macroscopic structure to microscopic product formation
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.
