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Showing 2 results for Coastal Structures

Amin Mahmoodi, Hassan Afshin, Habib Hakimzadeh, Davoud Jalali Vahid,
Volume 5, Issue 10 (3-2010)
Abstract

The intensity of damage in concrete structures has a vital relationship to the position of concrete respect to sea level. A hydraulic model consists of a channel and a wave maker machine capable of making regular waves with various heights and periods, has been designed and constructed in hydraulic laboratory to simulate the marine environment and conditions in this research study. The Oroomiyeh lake water and controlling the temperature of channel in 30-35 °c range were used to reproduce severe corrosive marine environment. Different water/ cement ratios and different cement contents were selected for reinforcement and plain concrete specimens. Furthermore, silica fume was used as supplementary cementing material. After standard curing, these specimens were kept in different conditions: submerged, tidal, splash, atmospheric and outdoors. A series of tests such as corrosion potential measurement, electrical resistivity and reinforcement corrosion intensity, chloride ion concentration and compressive strength were carried out at different ages. In this paper, specimens, durability in different zones have been investigated. Results show that in view of corrosion the splashing zone has the worst conditions and in submerged condition, because of thin air, although corrosion potential of reinforcement is high, the rate of corrosion intensity is low.


Mohammad Shirdel, Masoud Makarchian,
Volume 16, Issue 32 (11-2020)
Abstract

The regional waterways, especially Persian Gulf and Oman Sea, are witnessing the passage of giant oil tankers daily. Due to oil extraction in the oil fields, wars in the region, unexpected incidents, and various explosions, southern areas of Iran are contaminated with oil derivatives. In this paper, the impact of crude oil and gas oil contamination on clayey fine soil and its impact on coastal structures is investigated. For this purpose, in addition to preliminary tests, hydrometer test, direct shear test, unconfined compressive strength and solidification were carried out on contaminated soils. It was found that the presence of more than 20% of petroleum derivatives on clayey soil leads to a sharp decrease in soil shear strength, which is considered as a serious risk for the coastal structures and oil field structures. Also, by using type II cement with 10% of dry soil weight, in addition to the relative increase in soil strength, it can also prevent the movement of contamination in water and soil substrates. 


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