Stabilization of Weak Dredged Soils by Employing Waste Boulder Crusher Dust: A Laboratory Study
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ORIGINAL PAPER
Stabilization of Weak Dredged Soils by Employing Waste Boulder Crusher Dust: A Laboratory Study K. M. N. Saquib Wani . B. A. Mir
Received: 1 January 2020 / Accepted: 12 July 2020 Springer Nature Switzerland AG 2020
Abstract Dredged soils are weak soil deposits generated by dredging of water bodies. Construction of engineering structures on weak soils is considered unsafe and hence it becomes essential to utilize such deposits to reduce the load on engineers in finding alternative sites. In this study, a waste material produced post crushing of boulders in crushing units being left in huge quantities and posing enormous environmental, health as well as disposal problems was chosen as an additive for stabilization. Boulder dust being a natural waste has no harmful constituents or chemicals present in it, making it a sustainable product. The mechanical properties of the treated soil were studied by adding boulder crusher dust (BCD) in increments of 4%. Consistency limits, compaction characteristics, California bearing ratio and unconfined compressive strength were studied. Curing period of 7 and 21 days was given to the UCS samples in order to determine the effect of bonding due to possible cementitious material formations. The strength at 16% BCD and 21 days curing increased from 46 kN/m2 in the untreated state to 192 kN/m2. The experimental results were further supported by
K. M. N. S. Wani (&) B. A. Mir National Institute of Technology, Srinagar, Srinagar, J&K, India e-mail: [email protected]; [email protected] B. A. Mir e-mail: [email protected]
micro structural analysis indicating that the BCD is a promising additive for stabilization of the dredged soils and hence, can be used in various engineering applications like sub grade, backfill material, landfills, embankments etc. without affecting the ecology of the site and restoring the damages done by the waste material. Keywords Dredged soil Weak soil Waste material Stabilization Mechanical properties Boulder crusher dust Micro structural analysis
1 Introduction Weak soil deposits undergo settlements that occur over an extended duration of time, making such deposits exposed to calamities. They have reduced shear strength and low bearing capacity values. Geotechnical engineers have a daunting task of determining the performance and behaviour of such soil deposits. Using materials from such deposits for construction, pavements, foundations or even backfill poses a challenging task for a geo-technical engineer (Mir 2015a; Mir et al. 2016; Tahasildar et al. 2018; Fattah et al. 2019). Often, additives such as lime, cement, fly ash, limecement-fly ash admixture, cement kiln dust, quarry dusts, emulsified asphalt, polymer stabilizers and even biological processes of using microbes to enhance the
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Geotech Geol Eng
strength properties of weak soils have been used extensively by researchers (Choudhary et al. 2010; Nwaiwu et al. 2012; Koyama et al. 2013; Rajesh and Jain 2
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