Evaluation on Accelerated Corrosion Properties of the Concrete Produced by Replacing Sand by Copper Slag
Abstract— Copper slag is one of waste materials in the creation of copper, which can be utilized as fractional substitution of fine totals in concrete. This report shows the consequences of an exploratory study on different sturdiness tests on concrete containing mineral admixtures and copper slag as fractional substitution of cement and sand individually. In this report, M30 evaluation of concrete was planned and tests were directed with diverse rates of mineral admixtures with copper slag. The compressive strength is increased up to 10-20% mix of mineral admixture and copper slagged concrete when contrasted with normal concrete. Accelerated corrosion process by Galvano-static weight loss method is done to know the corrosion rate of concrete.
Keywords— Copper slag, Mineral admixtures, Accelerated corrosion process, Galvano-static weight loss method.
Abstract— This technical investigation represents a study on polymer modified high volume GGBFS concrete on providing durable and stable constructional material and increasing in utilisation of high volume of GGBFS in concrete and reduction of usage of portland cement and reduction of CO2 in the atmosphere. There was the many number of studies done on the polymer concrete, the polymer concrete is introduced in 1960’s based on the technical and practical situation in the construction industry. As considering the past history of polymer concrete and present situation of modern methods of strengthening, reparing and increasing in stability and life span civil engineering structure the technique of polymer concrete is introduced.
The high volume GGBFS concrete is one of the specific type of GGBFS concrete with lower water cementitious material ratio and at least 50% of Portland cement by mass is replaced by GGBFS. Due to lower water content, superplasticizer is essential in order to achieve the desired workability. GGBFS is used to improve workability of fresh concrete to reduce the heat of hydration, to increase durability and the strength of concrete, due to its pozzolanic activity.
In this study the GGBFS of 50% and 60% is used as the cement replacing material, SBR latex polymer, Super plasticizer of conplast-430 is used. This work is conducted to study the polymer modified high volume GGBFS concrete. Mix design is as per the high volume fly ash concrete technology best practice guidelines was used. The M30 grade concrete mix was prepared. The total number of specimens were casted 330. The 165 specimens as 50% and 165 specimens as 60% GGBFS replacement were casted. Polymer added to the concrete in the percentage of 0% to 5% in a 0.5% increment. The polymer added to the concrete with weight of the cementitious materials. The super plasticizer is added 1.2% throught the mix with weight of the cementitious materials. The higher workability is found at the 2.5% of polymer addition to the concrete. The strength of concrete is calculated at different percentages of polymers addition to the concrete. After the 28days of curing the test results shows the 2.5% of polymer and 50% of GGBFS replacement has the increase in strength as compared to 60% of GGBFS replacement for all strengths, i.e compressive strength, split tensile strength, flexural strength, shear strength, impact strength. Along with this the near surface characteristics such as water absorption and sorptivity are studied. By this study shows the percentages addition of polymer in concrete increases the strengths as compared to conventional concrete.
Keywords— Polymer (SBR Latex), GGBFS, Conplast SP430, strength properties, workability, water absorption, soroptivity.
Characteristics of Fly Ash from Thermal Power Plants and its Management along with Settling Pond Design
Abstract— World over for production of power pulverized coal fired boilers are extensively used. In India also 80% power is produced by pulverized coal fired boilers in National Thermal Power Plants. A very huge amount of ash is produced from these boilers. The quality of ash varies from plant to plant and from coke to coke depending on source of supply and type of combustion. In this dissertation an attempt has been made to categories problems and solutions related to it as given below:
For disposal of fly ash various kinds of ash ponds have been discussed, Design and economic aspects have been given. The effect of various type of ash/fly ash on air, land, water, agriculture living creature and human beings have been described. Some solutions have also been suggested. Experimental effect of addition of polymer carboxy methyl cellulose in slurry have been found to increase ash settling rates. For getting optimum ash settling rates 2ppm addition of carboxy methyl cellulose is found to be satisfactory. Utilization of fly ash for production of useful products has been mentioned.
Keywords— Coal, Fly ash, Polymer, Settling time of ash, Ash utilization
Heat Transfer and Flow Friction Characteristics of Solar Water Heater with Inserted Baffel Inside Tube
Abstract— Experimental investigation of friction factor and heat transfer characteristics of thermosyphone solar water heater with flat plate solar collector fitted with full length baffle of 5cm pitch have been presented. The flow regime is laminar for this study with the Reynolds number range 139 to 279. The experimental data obtained were compared with those obtained from plain tube data and 10cm pitch baffle. The effects of full length baffle inside the tube on heat transfer and friction factor were presented. The heat transfer coefficient for baffle tube with 5cm pitch is higher than that of plain tube and baffle tube with 10cm pitch for a given Reynolds number. The use of baffle created improved the performance of thermosyphone solar water heater.
Keywords— Augmentation, baffle creates, Heat Transfer, Reynolds Number, flat plate collector.
Abstract— Cloud computing ensures highly scalable services to be easily available on the Internet. Users’ data are usually processed remotely in unknown machines that users do not own in cloud. While enjoying the convenience of this new emerging technology, users’ are worried about losing control of their own data mainly in financial and health sectors. This is becoming a significant problem to the wide use of cloud services. To solve this problem, a novel highly decentralized information accountability framework that keeps track of the actual usage of the users’ data is proposed in the cloud. It contains an object-centered approach that enables enclosing our logging mechanism together with users’ data and policies. For this we leverage the JAR programmable capabilities to both create a dynamic and traveling object, and to ensure that any access to users’ data will trigger authentication and automated logging local to the JARs. In addition it also provides distributed auditing mechanisms and sends notification of data access via SMS (Short Message service) to data owners’ mobile.
Keywords— Cloud Computing, accountability, data sharing, auditing, log management.