Mechanical, durability and microstructure properties of lightweight concrete using aggregate made from lime-treated sewage sludge and palm oil fuel ash

Article ID	Journal	Published Year	Pages	File Type
6712991	Construction and Building Materials	2018	11 Pages	PDF

Abstract

This paper reports the investigation on toxicity characteristics, microstructure, physical and mechanical properties of artificial Posslite lightweight aggregate (LWA) made from lime-treated sewage sludge (SS) and palm oil fuel ash (POFA). The presence of crystals and a dense shell of Posslite LWA enhanced its strength and the rounded shape of LWA enhanced the workability of fresh lightweight aggregate concrete (LWAC). Results showed that mechanical and durability properties of Posslite LWAC were comparable to normal weight aggregate concrete (NWAC). Posslite LWAC possesses compressive strength, VPV, sorptivity, chloride diffusion of 50.4â¯MPa, 8.7%, 0.0151â¯mm/s0.5 and 2.12â¯Ãâ¯10â11 m2/s, respectively.

Keywords

EDX Salt ponding LWAC RCPT Rapid Chloride Penetration Test Lightweight aggregate concrete Sorptivity Water absorption palm oil fuel ash energy dispersive spectroscopy POFA Sewage sludge SEM Scanning electron microscope (SEM)Scanning electron microscopy XRD X-ray diffraction X-ray diffraction (XRD)