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Capillary characteristics and applicability of coal bottom ash as an anti capillary material for coastal constructions

Utilization of Coal bottom ash (CBA) as well as finding the solutions to prevent saline intrusion, meeting the needs of coastal infrastructure development have been considered by the authors of the article for a long time. In this study, the authors focused on analyzing capillary characteristics in order to find a suitable group of CBA particles, which can be applied in the design of foundations with the high ability in restricting or preventing the effects of salt in saline groundwater. | VNU Journal of Science Earth and Environmental Sciences Vol. 36 No. 4 2020 17-27 Original Article Capillary Characteristics and Applicability of Coal Bottom Ash as an Anti-Capillary Material for Coastal Constructions Nguyen Ngoc Truc1 Nguyen Van Hoang1 Do Ngoc Ha2 Nguyen Thao Ly3 1 VNU University of Science 334 Nguyen Trai Hanoi Vietnam 2 Geotest JSC. Pham Hung My Dinh 1 Hanoi Vietnam 3 Agrarian and Technological Institute The Peoples Friendship University of Russia Received 15 November 2019 Revised 17 February 2020 Accepted 26 February 2020 Abstracts Utilization of Coal bottom ash CBA as well as finding the solutions to prevent saline intrusion meeting the needs of coastal infrastructure development have been considered by the authors of the article for a long time. In this study the authors focused on analyzing capillary characteristics in order to find a suitable group of CBA particles which can be applied in the design of foundations with the high ability in restricting or preventing the effects of salt in saline groundwater. The obtained results show that 1 The capillary height is inversely proportional to the particle size the larger the particle the smaller the capillary height and vice versa. The CBA group with a diameter of 2.0 - 5.0 mm has an average capillary height around 3.33 cm a group of particles size of 1.0 - 2.0 mm is 7.16 cm a group of particles size of 0.5 1.0 mm is 23.36 cm. Meanwhile the group of particles size of 0.1 - 0.5 mm is 31.26 cm. 2 The capillary height is inversely proportional to the salt concentration in the capillary solution the maximum capillary height exhibits with the lowest capillary solution salinity 0.0 g L whereas it reaches minimum value when salinity approximate 33.0 g L. Thus CBA with the same particle size of gravel diameter from 2.0 to 5.0 mm is able to block capillary flow. This study forms the basis for the design solutions of anti-saline foundation especially in the context of climate change and sea-level rise. .