The present work deals with the corrosion behavior of mild steel in acidic medium. The inhibitive effect of substituted 1, 3, 4-Thiadiazol-2-amines on the corrosion of mild steel in 1 M H2SO4has been studied by weight loss and electrochemical methods. The electrochemical parameters for mild steel in acidic solution with and without inhibitor were calculated. The effect of temperature on the corrosion rate, activation energy and free energy of adsorption were also calculated. The synergistic effect has been studied by weight loss and electrochemical methods. The electrochemical parameters for mild steel in acidic solution were also calculated.
In recent days construction industry focuses on other than conventional concrete in infrastructural purposes like building etc., due to excess usage of cement, sand and other aggregates which leads depreciation of natural resources and effects on the environment. By utilization of lightweight bricks and foam concrete which reduces not only its self-weight but also improve resistance against heat and sound insulation and architectural features. The density of foam concrete varies from 300 to 1800kg/m3. Foam concrete composes of cement, water, fly ash and foaming agent without coarse aggregate. The function of foam is to create air bubbles in the cement-based slurry. The density of foam concrete depends on the quantity of foam added. The foam creates several pores with this effect; it has low thermal conductivity. As density of foam concrete is low at same time strength also low when compared to conventional concrete, so an attempt made to improve mechanical properties of foam concrete by adding admixtures like Silica fume and GGBS in different percentages. In these experimental studies, the workability and compressive strengths are mentioned
The present investigation to assess the properties of concrete containing cement kiln dust (CKD). Concrete specimens were prepared with 0% CKD, 10% and 20% CKD as a replacement of cement weight, 10% and 20% CKD. Ordinary Portland cement (O.P.C., 53 grade) was used throughout this investigation. The properties of concrete specimens were evaluated by measuring workability (using slump test), compressive strength, split tensile strength and Flexural Strength.. The compressive strength increased in the concrete mixtures including 10% CKD (as an addition of cement weight) and 5%, 10% Silica fume as an addition of cement weight with super plasticizers. A decrease in the compressive strength was noted in the concrete mixtures including 20%, CKD (as a replacement of cement weight). A similar trend was noted in the split tensile strength and the increase in split tensile strength was less pronounced than that in compressive strength. A similar trend was noted in the flexural strength percent increased when CKD was used in concrete mixtures. The using of silica fume enhanced workability, compressive strength, split tensile strength and flexural strength of the concrete for the types of cement. The ordinary Portland cement concrete mixtures including CKD had almost the same behaviors.
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