Table 1 - uploaded by Samuel Jjuuko
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Performance and durability of road pavements are significantly dependent on the strength and stability of the underlying soil layers, most especially the subgrade pavement layer. Currently, in Uganda most roads are constructed through low lying areas characterized by soft, hence weak, clay soils. The main practice, of improving the strength of such...
Context in source publication
Context 1
... laboratory classification and strength tests were carried out on clay specimens in accordance to BS1377, 1990. The results of these tests are shown in Table 1. The clay soil was classified as a fine grained lean clay of medium plasticity (CL) based on the Unified Soil Classification System. ...
Citations
... Polyethylene terephthalate (PET) and fly ash were mixed in proportions ranging from 0% to 20% by weight of the soil increased CBR value (Mishra et al., 2018). 19% increase in CBR reflected in a reduction in the overall thickness and life cycle cost of a road in Uganda were reduced in a study through the application of geogrids in pavement layers (Melling et al., 2017). Results from an investigation where pond ash (PA) and rice husk ash (RHA) was replaced at 30%-40% in expansive subgrade material shows high CBR values useable for road subgrade and embankment (Gupta et al., 2016). ...
13 Expansive soils are problematic soils which pose a risk to the safety of civil 14 engineering structures. These soils can be treated by compaction or by adding 15 additives to the soil. Where the strength and properties of expansive soil cannot be 16 improved via mechanical stabilisation (Compaction), a desirable strength can be 17 achieved through the use of chemical admixture techniques. The swelling and 18 shrinkage of expansive soils cause movement in the soil mass resulting in a 19 deferential settlement in engineering structures such as roads and building leading to 20 cracks and subsequent failure leading to high cost of maintenance. Calcium based 21 additives such as cement and lime have been used in expansive subgrade 22 stabilisation to enhance the strength, reduce swell and subsequent differential 23 settlement. However, the growing concerns on carbon dioxide (CO 2) emission and 24 climate change have reignited the need for a more sustainable soil stabilisation 25 techniques using waste materials. In this study, non-traditional expansive subgrade 26 treatment techniques using sustainable waste materials with respect to their 27 efficiency in improving the geotechnical engineering properties of the subgrade 28 materials have been investigated and reviewed. This study also discusses the 29 engineering problems associated with expansive soils, proposing an effective, 30 efficient, cheaper and sustainable application of non-traditional stabilisers in 31 expansive soil stabilisation. The study concludes that, the addition of non-traditional 32 J o u r n a l P r e-p r o o f 2 stabilisers in expansive subgrade stabilisation using chemical stabilisation 1 techniques can improve the engineering properties of expansive subgrade materials. 2
