COMPRESSIVE STRENGTH OF WASHED BOTTOM ASH AND WASTE PAPER SLUDGE ASH MORTAR FILLED IN COLD-FORMED STEEL COLUMN

Abstract

The impact of washed bottom ash (WBA) and waste paper sludge ash (WPSA) mortar on the compressive strength when filled in a built-up face-to-face cold-formed steel (CFS) stub column is studied and analysed. With the intention to solve the integrity issue of column structural elements, especially buckling and environmental issues that existed from the traditional material in mortar, and serious and uncontrolled dumping of waste material, the combination of CFS and mortar with the usage of waste material is proposed. Two CFS channel sections are connected in face-to-face configuration to form a symmetrical section and fill the hollow section with WBA and WPSA mortar. Three parts of the experimental activity are designed, including material properties of CFS, mechanical behaviour of WBA and WPA mortar, and mechanical behaviour of built-up face-to-face CFS stub column. The mechanical behaviour of built-up CFS stub columns with a varied height of columns at 150 mm, 250 mm, and 350 mm is tested. The result of the mechanical behaviour testing illustrates the compressive strength of all specimens reduced with increasing height of the column and shows having in reduction of the buckling either filled with normal or WBA and WPSA mortar. For heights of 150 mm, 250 mm, and 350 mm, the difference in ultimate load between built-up CFS stub columns filled with normal mortar and WBA and WPSA mortar is in the range of 36% to 48%.