With the tremendous increase in the population, per capita consumption of cement production has increased by many folds. This has lead to an exponential increase in the carbon dioxide levels causing extreme pollution to the environment. Necessary steps have been taken by the researchers worldwide to find alternatives to cement so as save the environment from this rising pollution. In this paper coal bottom ash [CBA] which is a by product of coal burning thermal power plant is used as partial replacement of sand and Waste limestone dust [WLSD] as partial replacement of cement in concrete. These two are the waste materials and their utilisation in concrete proves economical as the cost of concrete will be less and dumping cost of these two materials is a problem of discussion therefore, the replacements are done at 0%, (10%, 5%), (20% ,5%), (30% ,5%), (40%, 5%),(60%, 5%), (80%, 5%) of sand and cement respectively at fixed water cement [W/C] ratio (0.45) and fixed slump ranges with mix (1:1.2:2.5). The result showed that at fixed W/C ratio the strength (compressive strength, flexural strength, split tensile strength) and durability increased initially at small percentages of (10%, 5%), (20% ,5%), (30% ,5%) and later when the percentage of replacement is increased as (40%, 5%),(60%, 5%), and (80%, 5%) the strength and durability decreased.
Infrastructure in the coastal area is mostly made of steel and reinforced concrete steel which is susceptible to corrosion due to direct contact with sea water and also climatic conditions. There are several ways that can slow down the rate of corrosion reaction, one of which is by adding certain substances that act as inhibitors of corrosion reactions. This study is to determine the effect of using Rice Husk Ash as a natural inhibitor to reinforcing reinforced concrete reinforcement. The inhibitors used were rice husk ash mixed with reinforced concrete mixture as much as 5% and 10%. This corrosion measurement by calculating the weight lost from the reinforcement (inhibition efficiency). From the experimental results show that the higher the concentration given the lower the corrosion rate, and the optimal conditions obtained the effect of the use of natural inhibitors (rice husk ash) to reinforcing steel corrosion on the addition of 10% inhibitor of rice husk ash ash by 96%.
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