Performance of autoclaved aerated concrete using industrial wastes and fiber

Abstract

Autoclaved Aerated Concrete (AAC) is a light weight cellular concrete, which includes sand based AAC and flyash based AAC. In this research work studies on flyash based AAC had been carried out. The objectives of the study include: (i) Producing autoclaved aerated concrete having density in the range of 600 kg/m3 to 700 kg/m3 and compressive strength in the range of 2.5 to 3 MPa. (ii) Comparing the performance of Class C flyash incorporated autoclaved aerated concrete and Class F flyash incorporated autoclaved aerated concrete and to find the better compatible flyash to be used in autoclaved aerated concrete. (iii) Studying the performance of autoclaved aerated concrete with different types of fibers (Glass, Nylon, Polyester and Polypropylene fibers) and with different classes of flyash (Class C and Class F flyash) and to determine the optimum dosages of fibers and the better compatible flyash to be used in fiber reinforced autoclaved aerated concrete. (iv) 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. (v) Studying the performance of autoclaved aerated concrete with different dosages (5%, 10% and 15%) of phosphogypsum (PG) as partial replacement for cement in the production of autoclaved aerated concrete. (vi) Studying the performance of autoclaved aerated concrete with different dosages (10%, 20%, 30% and 40%) of phosphogypsum (PG) as partial replaceme Experimental investigations were carried out to find the compressive strength, modulus of rupture, dry density and water absorption of all the AAC specimens. The compressive strength and its corresponding weight loss of the AAC specimens after treating at elevated temperatures of 2500C, 5000C and 7500C were also examined. The effect of chloride attack using concentrated hydrochloric acid (Conc.HCl) at defined time intervals were determined. Analysis using Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDAX) and Fourier Transform Infrared Spectroscopy (FTIR) were also carried out. newline