IJIRST –International Journal for Innovative Research in Science & Technology| Volume 2 | Issue 11 | April 2016 ISSN (online): 2349-6010 All rights reserved by www.ijirst.org 518 Development of Light Weight Concrete by using Autoclaved Aerated Concrete Mr. M. Gunasekaran G. Saranya Assistant Professor UG Student Department of Civil Engineering Department of Civil Engineering KSR College of Engineering, Tiruchengode, Namakkal, Tamil Nadu KSR College of Engineering, Tiruchengode, Namakkal, Tamil Nadu L. Elamaran P. Sakthivel UG Student UG Student Department of Civil Engineering Department of Civil Engineering KSR College of Engineering, Tiruchengode, Namakkal, Tamil Nadu KSR College of Engineering, Tiruchengode, Namakkal, Tamil Nadu UG Student r P. Suresh UG Student Department of Civil Engineering KSR College of Engineering, Tiruchengode, Namakkal, Tamil Nadu Abstract Autoclaved Aerated Concrete is versatile lightweight concrete and they are generally used as blocks. The study of Autoclaved Aerated Concrete replacing natural sand by fly ash is investigated. Design AAC mix having mix proportion 1:3 with water cement ratio of 0.6. In these specimens using with lime and without lime, the sand is partially replaced by fly ash and cement is partially replaced by lime. The gypsum is constantly used in the specimens. The Aluminum powder is used at the range of 0.25gm, 0.5gm, 0.75gm and 1 of total weight of concrete. The properties of the mortar such as density, water absorption and compression strength for 24-hour steam curing were determined. Keywords: Aluminum powder, Fly ash, Gypsum, Sand, Cement, Lime _______________________________________________________________________________________________________ I. INTRODUCTION The aerated concrete is a one types of lightweight concrete. Aerated concrete is also well-known as a cellular concrete. It can be divided into two main types according to the method of production. The AAC is produced by adding in a predetermined amount of aluminium powder and other additives into slurry of Ground high silica sand, cement or lime and water. The background of foamed concrete began much later than lightweight aggregate concrete. Foamed concrete is not a particularly new material, it is first recorded use date back to the early 1920s. The application of foamed concrete for construction works was not recognized until the late 1970s. Beside the AAC began approximately 100 years ago. In 1914, the Swedes first discovered a mixture of cement, lime, water and sand that was expanded by the adding aluminium powder to generate hydrogen gas in the cement slurry. Prior to that, inventive minds had tried beaten egg whites, yeast and other unusual methods of adding air to the concrete. It was reported that foamed concrete was developed in Europe over 60 years ago and has since then been on the international market for more than 20 years. Foamed concrete have high flow ability, low self-weight, minimum consumption of aggregate, controlled low strength, and excellent thermal insulation properties. The density of foamed concrete has wide range (1600-400kg/m3), with appropriate control in the dosage of the foam, can be obtained for application to structural, partition, insulation, and filling grades. II. LITERATURE REVIEW Paweł Walczaka*, Paweł Szymańskib; In recent years the evaluation of U-value for buildings materials has been seen. Since 1st January 2014U-value can’t be higher than 0,25 [W/m2K], but since 2017 this value will be 0,23 and 0,20 from 2021. Therefore, a good solution to fulfill mentioned conditions is using buildings material with better thermos insulation. One of the best construction materials, which have very low λ value [W/mK] is an autoclaved aerated concrete (AAC). It’s the reason why AAC is the most popular buildings material from years. AAC could be produced with using various aggregates, like sand or fly ash. Test results of thermal conductivity clearly shown that AAC based on siliceous fly ash have better λ value than sand AAC in the same density. Polish energy policy is based on coal and production AAC based on siliceous fly ash is a great solution to utilization this waste. Autoclaved aerated concrete has better λ value than other available construction materials in polish market. Lower density have good impact on environment, because lower weight caused possibility to transport more products by the same truck and also it means less waste from buildings made from AAC in the future. This waste can be used again in normal production process of AAC. Due to these facts were undertaken studies of possibility of production AAC in 350 [kg/m3] density in PGS process
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