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Naveen Kumar, B. T.
- The Experimental Study on Behaviour of Blended Cement Concrete with 80% Replaced with Nano-Metakaolin and Steel Slag at Elevated Temperature
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PDF Views:2
Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur, Chennai, Tamilnadu-603203, IN
1 Department of Civil Engineering, SRM University, Kattankulathur, Chennai, Tamilnadu-603203, IN
Source
International Journal of Emerging Trends in Science & Technology, Vol 2, No 1 (2016), Pagination: 15-18Abstract
The effect of high temperature up to 800°C on concrete with 80% replacement of fine aggregate using nano-metakaolin, 80% replacement of fine aggregate using steel slag and their hybrid mix is compared to conventional concrete in this research work. Ordinary Portland cement containing fly ash is used as blended cement to prepare the concrete mix. M 30 grade concrete with water cement of 0.45 is used for the study. The project work involves casting of cubes (150mm x 150mm x 150mm), cylinders (150mm diameter and 300mm height) and prism (100mm x 100mm x 500mm). The concrete specimens are cured under water for 28 days and expose to 400 °C, 600 °C, and 800°C for 1 hour. The compressive strength, spilt tensile strength and flexure strength are measured for these specimens and compared with the strength of conventional concrete. The strength of each mix is found to increase compared to conventional concrete and a greater increase in strength is observed in mix with partial replacement with nanometakaolin. The strength is found to increase up to 600 °C and showed to decrease at 800 °C.Keywords
Nano-Metakaolin, Blended Cement, Steel Slag, High Temperature.
- Toxic Effects of Quinalphos on Protein Content and Growth Rate in Freshwater Teleost, Cyprinus carpio (L.)
Abstract Views :375 |
PDF Views:0
Authors
Affiliations
1 Department of Aquatic Environment Management, College of Fisheries, Mangalore, IN
2 Department of Veterinary Pharmacology and Toxicology, Veterinary College, Bangalore, IN
3 Department of Aquaculture, College of Fisheries, Mangalore, IN
1 Department of Aquatic Environment Management, College of Fisheries, Mangalore, IN
2 Department of Veterinary Pharmacology and Toxicology, Veterinary College, Bangalore, IN
3 Department of Aquaculture, College of Fisheries, Mangalore, IN
Source
Toxicology International (Formerly Indian Journal of Toxicology), Vol 23, No 1 (2016), Pagination: 89-94Abstract
Organophosphate based pesticides account for a major percentage of pesticides used in domestic, agricultural and industrial applications throughout the world. They are highly popular because they are effective, non persistent and relatively less expensive. Quinalphos is a synthetic organophosphate which has become a matter of concern because of its potentiality and hazardous effect. Hence, the present investigation was designed to assess the impact of quinalphos on total protein content in the selected tissues and growth rate of freshwater fish, Cyprinus carpio. The lethal toxicity of quinalphos to the fish exposed for 96 h was found to be 2.75 ppm. For sublethal toxicity study, the fish were exposed to two concentration viz., 1/5th of LC50 (0.550 ppm) and 1/10th of LC50 (0.275 ppm) along with control as reference for 4, 8, 16 and 32 days. Decrease in total protein concentration and growth rate were observed in 4th and 8th day of exposure, but on 16th and 32nd day of exposure all the values reached nearer to normal condition. The decline in total protein levels and relative growth rate at initial exposure periods may indicates the high energy demand associated with imposed quinalphos stress. Restoration of protein fractions to normal, implies that after 8 days of exposure there seems to exist an oscillatory phase in protein turnover towards a more synthetic phase leading to the establishment of recuperation and adaptation phenomena.Keywords
Quinalphos, Toxicity, Freshwater Teleost, Total Protein, Growth.References
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