Laboratory modelling of strength and deformation characteristics of a high swelling soil treated with industrial wastes
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ORIGINAL PAPER
Laboratory modelling of strength and deformation characteristics of a high swelling soil treated with industrial wastes Javairia Mumtaz 1 & Imtiaz Rashid 2 & Jahanzaib Israr 2 Received: 8 April 2020 / Accepted: 29 July 2020 # Saudi Society for Geosciences 2020
Abstract Presence of swelling soils in the foundations may cause excessive damage to the buildings, pavements and other lightweight structures due to its differential volume changes with the moisture. On the other hand, some of the massively generated industrial wastes offer engineering characteristics, which may be utilized with a twofold benefit of cleaned environment and soil stabilization. In this study, silica fumes and scrap rubber powder from local industry have been mixed with a highly expansive soil in different proportions to improve its strength and deformation characteristics. Furthermore, scanning electron microscope images were studied to understand the effects of additives on the stabilization mechanism of the expansive soils. The analyses of results confirmed that these industrial wastes could markedly improve the undrained shear strength and sufficiently decrease the swelling characteristics of tested soil. A set of empirical correlations have also been proposed to predict both swell potential and pressure that could be subsequently verified through additional experimental data obtained from additional published studies. In essence, the proposed empirical correlations could predict the behaviour of the tested additional data with a standard error of mean well within ±10% that may be suitable for preliminary assessments of most practical sites. Keywords Expansive soil . Silica fume . Scrap rubber powder . Swell potential
Introduction Design and construction of both residential and transport infrastructure over swelling soils could be very challenging due to their high moisture susceptibility and low bearing capacity (Soltani et al. 2019). In these structures, excessive ground deformation is one of the major problems arising due to soil’s
Responsible Editor: Zeynal Abiddin Erguler * Jahanzaib Israr [email protected] Javairia Mumtaz [email protected] Imtiaz Rashid [email protected] 1
Department of Civil Engineering, University of Central Punjab (UCP), Lahore, Pakistan
2
Department of Civil Engineering, University of Engineering and Technology (UET), Lahore, Punjab 54890, Pakistan
swell-shrink behaviour, where uplift swelling pressure along with uneven upheaving could induce differential settlement and local shear failures (Jones and Jefferson 2012). This may cause serious loss of life, time and money, thus warranting thorough investigations (Khademi and Budiman 2016; Soltani et al. 2018). Notably, the identification of swelling soils and associated hazards is very important, for which, the basic soil properties obtained through physical testing can be very useful means (Ardani 1992). Pitts (1984) suggested liquid limit and plasticity index as simple and quick tools to approximate the swelling potential of soils tha
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