Bøger af Subhashish Dey

La présente étude s'est concentrée sur l'identification de la possibilité d'un liant alternatif au ciment dans le béton. La raison en est l'augmentation du coût de fabrication du ciment, qui libère également une grande quantité de dioxyde de carbone lors de sa production. Un nouveau liant appelé géopolymère est donc utilisé à cette fin. Dans ce projet, le béton géopolymère est la solution pour remplacer à 100 % la teneur en ciment en utilisant un liant géopolymère composé de cendres volantes, de GGBS et de liquides alcalins par un durcissement à l'air ambiant au lieu d'un durcissement à la vapeur ou au four, car il est pratiquement difficile d'avoir un durcissement au four ou à la vapeur sur le site. D'autre part, l'utilisation des déchets de verre comme liant dans les mélanges de béton géopolymère permettra d'assurer la faisabilité du développement durable. Cette étude se concentre sur le développement de mélanges de géopolymères et sur l'étude des propriétés mécaniques et de durabilité du béton géopolymère G40 à mélange tertiaire. Tertiaire signifie trois dans l'ordre, c'est-à-dire que le béton géopolymère est conçu en utilisant trois matériaux liants tels que les cendres volantes, le GGBS et la poudre de verre. Les liants seront activés à l'aide d'hydroxyde de sodium et de silicate de sodium en tant que solution alcaline.

La presente indagine si è concentrata sull'individuazione di un legante alternativo al cemento nel calcestruzzo. Il motivo è l'aumento dei costi di produzione del cemento, che inoltre rilascia un'elevata quantità di anidride carbonica durante la sua produzione. Per questo motivo viene utilizzato un nuovo legante chiamato Geopolimero. In questo progetto, il calcestruzzo geopolimerico è la soluzione per sostituire il 100% del contenuto di cemento utilizzando il legante geopolimerico, composto da ceneri volanti, GGBS e liquidi alcalini, con una stagionatura ambientale anziché a vapore o in forno, poiché è praticamente difficile avere una stagionatura in forno o a vapore in cantiere. D'altra parte, l'utilizzo dei rifiuti di vetro come legante nelle miscele di calcestruzzo geo-polimerico garantirà la fattibilità di uno sviluppo sostenibile. Questo studio è incentrato sullo sviluppo di un mix design per il geopolimero e sullo studio delle proprietà meccaniche e di durabilità del calcestruzzo geopolimerico G40 Tertiary Blended. Terziario significa tre in ordine, cioè il calcestruzzo geopolimerico è stato progettato utilizzando tre materiali leganti come flyash, GGBS e polvere di vetro. I materiali leganti saranno attivati utilizzando idrossido di sodio e silicato di sodio come soluzione alcalina.

Present investigation focused on identifying the possibility of an alternative binder instead of cement in concrete. The reason is the hike in the cost of cement manufacturing, also cement releases high amount of Carbon dioxide during its production. So a new binder called Geopolymer is used for the purpose. In this project, Geopolymer concrete is the solution for100% replace of the cement content by using Geopolymer binder which consists of fly ash, GGBS and alkaline liquids by ambient curing instead of steam or oven curing, as it is practically tough to have an oven curing or steam curing at site. On the other hand, utilization waste Glasses as binder in geo polymer concrete mixes will provide feasibility for sustainable development. This study is focused on developing mix design for geopolymer and to study the mechanical and durability properties of G40 Tertiary Blended Geopolymer concrete. Tertiary means three in order i.e., Geopolymer concrete is designed by using three binder materials such as flyash, GGBS and Glass - powder. The Binder materials will be activated using Sodium Hydroxide and Sodium Silicate as Alkaline Solution.

In rural India the contamination of water by nitrite is profound. Cost- effective and safe water treatment methods are required to remove nitrite from water. A nitrite is regulated in drinking water quality primarily because excess amount can cause methemoglobinemia (also known as blue baby syndrome) disease. The fresh water contains 3% in the worldwide. Human and industrial activities produce and discharge wastes containing nitrite metal into the water resources making them polluted and threatening human health and ecosystem. Conventional methods for the removal of nitrite metal ions such as chemical precipitation and membrane filtration are more expensive when treating large amounts of water, inefficient at low concentrations of metal and generate large quantities of sludge and other toxic products that require careful disposal. Bio-sorption is eco-friendly and alternative methods for treatment of waste-water. These methods have advantages over conventional methods because it has a lower cost, easily available and reused. The present work studies the feasibility use of neem leaf, custard apple leaf, guava leaf, mango tree leaf and banana peel as a biosorbent in removal.

The present work focused on the seasonal variations in the physico-chemical parameters of the Gudlavalleru engineering college pond at Krishna district Andhra Pradesh during summer and winter season. Pond is found outside the college and college management imposes restrictions over misuse of the pond, therefore they remain comparatively clean. Total nineteen parameters were analysed and their seasonal variation was discussed. The correlation matrix of various physico-chemical parameters are computed and analysed. There is a relationship among the ecologists and microplanners about the importance for conservation of ponds as sustainable source of water in rural communities. A wide variety of inorganic toxic substances may be found in the water pond is very small or trace amounts. Even in trace amounts, they can be danger to public health. Some toxic substances occur from the natural sources but many others occur due to industrial activities and/or improper management of hazardous waste. Results of the present study indicated that the mean values of temperature, pH and total alkalinity were highest in summer season and lowest in winter season.