Journal
APPLIED CLAY SCIENCE
Volume 136, Issue -, Pages 58-66Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2016.11.003
Keywords
Lime-treated soil; Aggregate size; Curing time; Mineral composition; Microstructure
Funding
- European Commission [FP7-PEOPLE-IRSES-612665]
- China Scholarship Council (CSC)
- Ecole des Ponts ParisTech
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This work aims to investigate the aggregate size effect on changes in mineralogical composition and microstructure of lime-treated compacted soils. Three soil powders with different maximum aggregate sizes (D-max = 5, 1 and 0.4 mm) were prepared prior to the treatment with 2% of lime. X-ray diffraction (XRD), environmental scanning electron microscope (Env. SEM) coupled with chemical analysis using energy dispersive X-ray spectrometry (EDX) and mercury intrusion porosimetly (MIP) were used to analyse untreated and treated samples at various curing times. Crystallized C-S-H on tobermorite form was identified in the lime-treated soil prepared with large aggregates after one year curing, and an evident increase in nanopores <0.1 mu m C-S-H was also observed due to C-S -H creation. By contrast, in the case of smaller aggregates, no obvious C-S-H peaks were observed by XRD technique after the same curing time, even though some evidence of such phases are provided by Env. SEM coupled to EDX analysis. But a large amount of undetectable nanopores <6 nm (considering the MIP technical limitation) was supposed to be formed and could be attributed to the creation of nanocrystallized C-S-H or poorly-crystallized C-S-H (that may fill the pores larger than 2 mu m). Such type of C-S-H phases occurred when lime was coated in thin layer on the large surface associated to lime-treated soil prepared with small aggregates. (C) 2016 Elsevier B.V. All rights reserved.
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