Geochemistry of Ground and Groundwater Pertinent to Chemical Attacks Mitigation on Concrete Foundations; A Case Study of the City of Rasht,Northern Iran |
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| Authors: | Hossein Akbarzadeh Kasani Naser Hamidzadeh |
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| Institution: | 1.Department of Civil Engineering,University of Guilan,Rasht,Iran;2.Department of Civil and Environmental Engineering,University of Alberta,Edmonton,Canada |
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| Abstract: | Presence of aggressive chemicals in ground and groundwater can deteriorate concrete foundations or its reinforcements. Concrete codes require preventive measures to assure durability of concrete foundations which is based on geochemistry information of the site. Construction in the city of Rasht, in the Iranian Caspian coast, is fast growing often without sufficient geochemistry data for residential buildings. The later may pose risk of chemical attacks on concrete foundations. To resolve this shortcoming, this study aimed at investigating geochemistry of ground and groundwater from the upper 10 m which can serve as a preliminary guideline for shallow foundation constructions in the city. The database for this study included previous geochemical investigations from 50 boreholes in the city as well as boring eleven test pits at various locations along with soil and groundwater geochemistry tests. The geochemistry experiments included measurement of sulfate, chloride, organic matter, as well as pH in soil and groundwater. Geochemistry of ground and groundwater in the city mostly fell within permissible limits set by a local concrete code. Based on current study, service environment for shallow concrete foundations in the city was categorized in a moderate class; hence, durability requirements from the same local concrete code were emphasized. |
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