Abstract
A laboratory study was carried out to evaluate the effect of lime, nano-zeolite, and polypropylene fibers on EC, pH, unconfined compressive strength (UCS), E50, Eu, and indirect tensile strength (ITS) of kaolin clay cured at the temperatures of 20 and 40 °C after various treatment times. Furthermore, X-ray diffractometer (XRD) and scanning electron microscopy (SEM) analyses were performed to assess the microstructure of the stabilized/reinforced samples. Based on the results, the replacement of lime with nano-zeolite has a beneficial effect on mechanical characteristics. The addition of nanoparticles up to 40% replacement had the best efficiency on the strength of the stabilized samples, particularly at the temperature of 40 °C. So that the samples containing 10% lime with 40% replacement of nano-zeolite after 28 days of curing at 20 and 40 °C showed a compressive strength of about 20 and 7 times compared to that of kaolin clay. Increasing the amount of lime also increases the peak strain energy (Eu) and secant modulus (E50). Moreover, the incorporation of fibers, despite the slight decrease in compressive strength, shows a great ability to increase tensile strength and strain of the samples and, consequently, increase the Eu. The results of the XRD and SEM tests showed that the inclusion of additives in the kaolin clay altered the soil structure and form the calcium silicate hydrate (CSH) gels during the pozzolanic reaction.
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Akbari, H.R., Sharafi, H. & Goodarzi, A.R. Effect of polypropylene fiber inclusion in kaolin clay stabilized with lime and nano-zeolite considering temperatures of 20 and 40 °C. Bull Eng Geol Environ 80, 1841–1855 (2021). https://doi.org/10.1007/s10064-020-02028-x
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DOI: https://doi.org/10.1007/s10064-020-02028-x