EXPERIMENTAL STUDY ON AUTOCLAVE AERATED CONCRETE (AAC) BLOCKS IN BUILDING CONSTRUCTION M.NAGESH 1 , SK. BAJAMMA 2 , 1 Student, Department of civil engineering, St. Marys Group of institutions, Chebrolu, Guntur, AP-522212 2 Asst. Professor, Department of civil engineering, St. Marys Group of institutions, Chebrolu, Guntur, AP- 522212 Abstract: Autoclaved Aerated Concrete (AAC) is a light-weight building-construction product of fly ash, sand, water, cement, lime and aluminum powder, used globally for brickwork. The AAC is now widely accepted as an innovative and high-quality building-material. In the recent years, AAC has been widely used for the interior of industrial, commercial and residential buildings. The AAC blocks are used for both load bearing and non-load bearing masonry walls. The main objective of this study is to validate previously proposed design provisions for low-strength AAC material. i) Studying the performance of autoclaved aerated concrete with different dosages (5%, 10%, 15% and 20%) of Ground Granulated Blast Furnace Slag (GGBS) as partial replacement for cement in the production of autoclaved aerated concrete. ii) Studying the performance of autoclaved aerated concrete with different dosages (10%, 20%, 30% and 40%) of phosphogypsum (PG) as partial replacement for fly ash in the production of autoclaved aerated concrete. Experimental study was carried out to find the compressive strength, modulus of rupture, dry density and water absorption of all the AAC specimens. Keywords: AC, light weight, reduces, eco-friendly. 1.0 INTRODUCTION Autoclaved Aerated Concrete (AAC) is one of the most common types of light weight cellular concrete having density approximately one fourth of that of conventional plain cement concrete. The use of lightweight materials like AAC helps to perform construction of any tall building in a faster manner. The ingredients of Autoclaved Aerated Concrete are cement, flyash or sand, lime, gypsum, aluminum powder, soap oil and water, out of which the most important ingredient is aluminium powder. It plays the major role of aerating the entire concrete matrix, and creates a cellular structure in the aerated concrete. The first attempt of producing aerated concrete was done in the year 1889 by a Czechoslovakian researcher Hoffman. Later in 1914, American scientists, Aylsworth & Dyer used aluminum powder and calcium hydroxide as aerating agents in the cementitious matrix to form aerated concrete. In 1919, Grosahe from Berlin used metal powders as hydrogen gas forming agent in the autoclaved aerated concrete. Various trials were performed right from 1880’s to 1920’s in various parts of the world for making a composite concrete which is light in weight. In 1924, a Swedish architect and inventor Johan Axel Eriksson arrived a perfect mix for autoclaved aerated concrete. Autoclaved Aerated Concrete The most important ingredient in autoclaved aerated concrete is aluminium powder, which plays a major role of aerating the entire concrete matrix. The primary ingredients apart from aluminium powder are binder and filler materials such as cement, flyash/silica sand, lime, gypsum and water. Industrial Waste Materials: Usage of industrial waste materials in special concrete has been studied by many researchers in recent years. It is proved that, concrete with better performance can be produced with the addition of industrial waste materials. The dosage of the industrial waste and fibers in autoclaved aerated concrete was decided, based on the strength and durability parameter. The selection of the industrial wastes to be added to AAC was arrived by considering both the economy and compatibility with the other raw materials. Background of the Study: For the past 15 to 20 years, the utilization of industrial wastes and fibers, play a significant role in construction industry. Very limited past researches were conducted for utilizing industrial wastes and fibers in light weight cellular concrete. Light weight concrete has various applications when compared to that of the conventional high density plain cement concrete. One of the most important properties Journal of Engineering Sciences Vol 13 Issue 12,2022 ISSN:0377-9254 www.jespublication.com Page 246
EXPERIMENTAL STUDY ON AUTOCLAVE AERATED CONCRETE (AAC) BLOCKS IN BUILDING CONSTRUCTION
Apr 26, 2023
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