Preprint Article Version 1 This version is not peer-reviewed

Acid Resistance of Lightweight Brick Powder Based Alkali Activated Material from Construction and Demolition Wastes

Version 1 : Received: 24 June 2018 / Approved: 25 June 2018 / Online: 25 June 2018 (12:26:06 CEST)

How to cite: Wan, K.T.; Sivanathan, A.; Kastiukas, G.; Zhou, X. Acid Resistance of Lightweight Brick Powder Based Alkali Activated Material from Construction and Demolition Wastes. Preprints 2018, 2018060387 (doi: 10.20944/preprints201806.0387.v1). Wan, K.T.; Sivanathan, A.; Kastiukas, G.; Zhou, X. Acid Resistance of Lightweight Brick Powder Based Alkali Activated Material from Construction and Demolition Wastes. Preprints 2018, 2018060387 (doi: 10.20944/preprints201806.0387.v1).

Abstract

The annual construction and demolition waste (CDW) generated from EU construction sector was 850 million tons, which represented 31% of the total waste generation and about 28% of CDW was ceramics (bricks and tiles). In this study, the feasibility of using CDW brick powder as the precursor of alkali activated mortar (AAM) and extruded polystyrene (XPS) as the lightweight aggregates to form lightweight brick powder AAM (LW-BP-AAM) for non-structural applications was investigated. The thermal conductivity of LP-BPAAM was 0.112 W/m·K with density of about 1,135 kg/m3 which was lower than the counterparts with similar density in literature. The acid resistance of LW-BP-AAM is comparable to conventional fly ash based AAM and superior than ordinary Portland cement. From the scanning electron microscopy with energy dispersive X-ray spectroscopy, there was no severe damage on the surface of LW-BP-AAM but aluminate was removed from the matrix which was further verified in Fourier transform infrared spectroscopy. The mass and strength loss of LP-BP-AAM was 1.5% and 33%, respectively. Although the compressive strength of the LP-BP-AAM was low (about 1.8 MPa), it can be improved by optimising the particle size of the XPS aggregates.

Subject Areas

alkali activated materials; construction and demolition waste; brick powder; acid resistance; extruded polystyrene aggregates lightweight materials

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