Abstract
Corrosion of steel in reinforced concrete causes severe damage in durability as weakness support of reinforced elements. We investigate impacts of cement fraction and curing method on corrosion progression. Corrosion level is evaluated by measuring carbonation penetration and electrical conductivity in concrete plots as indicators of corrosion. Two types of cement were used, Normal and quick setting. For each cement type, two concrete mixes were used (3% and 8% C3A are designed). Six levels of CaCl<sub>2</sub> ranging from 0.5 % to 3% were used to simulate corrosion. Also, two curing methods are compared, liquid water and steam application are used. Chloride ion in low alumina cement mortar progressed faster than high alumina. The results show significant increase in carbonation depth for (less cement) compared to (more cement) mixes. Also, steam curing showed less penetration than normal water setting method. Variation in carbonation penetration for 0.5 and 1 % CaCl<sub>2</sub> is high close to double. Electrical potential of steel in cement mortar is negatively related with increasing calcium chloride content and with increasing cement content. Also, normal setting cement shows better corrosion protection as demonstrated by higher measured EC.
Highlights
Cement is the most common used construction material worldwide
Chloride ion is evaluated in cement mortar composed of cement alumina content of (CaCl2) from 0.5 - 3% of cement per weight analyzed by adding 1% silver nitrate solution
Chloride ion was detected at calcium chloride percent of more than 2.5%
Summary
Cement is the most common used construction material worldwide. Concrete is basic building material used in construction, usually with steel in many elements of reinforced concrete. Concrete and steel in structure elements are exposed to corrosive chemicals that penetrate into the concrete elements with water. This effect causes severe damage and weakness in affected elements [1, 2, 3, and 4]. Reinforcement of concrete with steel strengthens the structural element in tension because concrete alone cannot provide it [5, and 6]. The reinforced concrete, has steel bars to give the concrete’s its tensile strength capacity [6, 7]. A major factor that determines concrete properties is the water/cement ratio. High water fraction causes an increased number of capillary voids which reduces concrete rigidity
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