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Framework for in situ soil stabilization based on electrokinetic principles
Published in Sandra Erkens, Xueyan Liu, Kumar Anupam, Yiqiu Tan, Functional Pavement Design, 2016
Nikiforos G. Pavlatos, Athanasios (Tom) Scarpas
Soil stabilization is the process through which the mechanical properties of weak soil are improved. It can be simply performed by excavating the weak soil, mixing it with the necessary stabilizers and placing the improved soil in its initial position. However, the situation differs radically when the subgrade under existing pavements is considered due to the fact that the existing pavement needs to be removed at the start and then repaved at the end. This process is associated with high costs, severe traffic disruptions and dissatisfied public. Traditional soil stabilization also comes with high levels of dust, noise and pollution. Therefore, the method examined in this paper, soil stabilization based on electrokinetic principles, seems an attractive alternative as it does not maintain the drawbacks of the traditional soil stabilization.
Bio-enzyme stabilisation of Kaolinitic clay
Published in Sheela Evangeline, M.R. Rajkumar, Saritha G. Parambath, Recent Advances in Materials, Mechanics and Management, 2019
Elsa Jacob Joseph, M.K. Sayida
Subgrade is defined as a portion on which pavement, base, subbase, or a layer of any other material is placed. Since pavements are engineered to distribute stresses imposed by traffic to the subgrade, the subgrade conditions have a significant influence on the pavement structure. Soil Stabilization is the most common method of subgrade improvement. There are different methods of soil stabilization, including physical, chemical, biological or combined methods. All these methods add to the cost of road construction.
Soil
Published in Rajib B. Mallick, Tahar El-Korchi, Pavement Engineering, 2017
Rajib B. Mallick, Tahar El-Korchi
Soil stabilization refers to improvement of soil so that it performs a required function. Soil stabilization techniques can be classified into two groups, mechanical and admixture. Mechanical stabilization can be through densification or compaction, addition of granular material and compaction, and the use of reinforcement, such as geotextile. Admixture stabilization (which also includes compaction as part of the process) can be done with the use of additives, such as lime, Portland cement, and asphalt.
Cyclic undrained properties of stabilised expansive clay with lignosulfonate
Published in Geomechanics and Geoengineering, 2023
Bahram Ta’Negonbadi, Reza Noorzad, Mehran Ta’Negonbadi
Expansive soils are one of the problematic soils that can cause damages to the buildings and other structures placed on these soils, associated with water content changes due to artificial agents, or periodical changes in weather conditions (Basma et al. 1995). Multiple studies have been performed on the damages of expansive soil to structures and lightweight buildings (Al-Rawas et al. 2005, Dafalla and Shamrani 2011, Chen 2012). Stabilisation can improve the performance of these soils. The stabilisation of soil is an effective method to enhance geotechnical characteristics. Chemical stabilisation is a commonly adopted soil improvement technique to enhance the performance, shear strength, and load-bearing capacity of soils. Studies have investigated the role of stabilising agents such as lime, cement, gypsum, fly ash, etc., for expansive clay (Lade and Overton 1989, Indraratna 1996, Al-Rawas et al. 2005, Al-Mukhtar et al. 2010, Horpibulsuk et al. 2010, Sharma et al. 2012, Abdelkrim and Mohamed 2013). However, the use of these traditional agents may be harmful to the environment. As an example, soil stabilisation with these agents can increase the soil pH, and, in consequence, affects the growth of plants and groundwater quality (Alazigha et al. 2016, Chen and Indraratna 2014a). Moreover, soils stabilised with traditional agents often exhibit a highly brittle response, particularly under dynamic loads, which can be unfavourable for many applications, such as airport runways and rail embankments (Chen and Indraratna 2014a).
Investigating the effects of nanochemical-based ionic stabilizer and co-polymer on soil properties for pavement construction
Published in International Journal of Geotechnical Engineering, 2021
Prachi Kushwaha, Avanish Singh Chauhan, Sankalp Swami, Bajrang Lal Swami
Soil stabilization refers to the process of improving physical and engineering properties of soil through external interventions. The earliest known method of soil stabilization is compaction. Stabilization techniques could be broadly divided into two categories: (i) traditional (ii) non-traditional. Traditional techniques include use of lime, fly ash, cement, cement kiln dust, bitumen and so on. All these techniques have been studied extensively in the past (Dhar and Hussain, 2019; Emeh and Igwe 2016; Little et al. 2000; Petry and Armstrong 1989). The usage of these stabilizers could prove to be costly especially in developing nations and areas where these additives are not locally produced and have to be imported (Cook, Petts, and Rolt 2013; Petry and Little 2002). Additionally, in cases involving highly sulphonated soils, stabilization with these calcium rich products/stabilizers leads to excessive heaving and swelling (Kota, Hazlett, and Perrin 1996; Mitchell and Dermatas 1992; Rollings, Burkes, and Rollings 1999) According to Nelson et al. (2015), chemical additives could be classified as traditional and non-traditional additives; hydrated lime, Portland cement and so on constitute to former, whereas potassium compounds, sulphonated oils, ammonium chloride and so on comprise the latter.
Wood bioash effect as lime replacement in the stabilisation of different clay subgrades
Published in International Journal of Pavement Engineering, 2020
Martina Zagvozda, Tatjana Rukavina, Sanja Dimter
Subgrade is a natural soil layer or the top layer of the embankment under pavement structure that must be able to support loads transmitted from the pavement structure. A low bearing capacity and high volume changes of subgrade cause excessive settlement, cracking and other deformations in the pavement structure. During road construction, sometimes it is not possible to avoid soils of low bearing capacity that do not meet the conditions required by technical regulations (Rukavina et al. 2007). Soil stabilisation is a process in which properties, such as strength, bearing capacity and the durability of soil, are improved by the addition of other materials or binders (mechanical or chemical stabilisation). It is performed to meet minimum technical conditions, improve the performance of materials, reduce the cost of road construction and to make construction faster and more sustainable (Kennedy 2006). Traditional stabilising agents, such as lime or cement, can be used for soil stabilisation, but various by-products (particularly coal fly ash) and waste materials could also perform well in such an application (Estabragh et al.2013, 2020, Behnood 2018).