Chloride Binding Capacity of Concrete Containing Rice Husk Bark Ash under Marine Environment

Abstract

In this research, the effect of ground rice husk-bark ash (GRBA) and W/B ratios on chloride bindingcapacity of concrete under marine environment were studied. Control concretes were designed usingPortland cement type I with W/B ratios of 0.45 and 0.65. Concretes containing GRBA were cast usingGRBA to replace Portland cement type I at percentages of 15, 25, 35, and 50% by weight of binder at thesame W/B ratios of the control concretes. The 200-mm concrete cube specimens were cast. The specimenswere cured in water for 28 days then were exposed to tidal zone of marine environment. Consequently, freechloride (acid soluble) and total chloride (water soluble) contents in the concrete were measured after theconcrete was exposed to the tidal zone of marine environment for 5 years.The results showed that the percentage of chloride binding capacity compared to total chloridecontent (Pb) increased with the increase of GRBA in the concrete. However, the use of high volume GRBAin concrete (50% replacement) results in decreases the percentage of chloride binding capacity. Also, it wasfound that the decrease of W/B ratio resulted in the increase of Pb of concrete.

Keywords : Rice Husk-Bark Ash / Chloride Binding / W/B Ratio / Marine EnvironmentAbstract* Corresponding