ABSTRACT
Lightweight construction materials with excellent thermal and acoustic insulation abilities are widely used in building envelopes, partitioning walls, sandwich components, pipeline backfill, and other applications. However, the durability of these materials is often compromised due to low strength, water resistance, and unattainable ultra-low density. Our previous research has focused on developing fly ash and slag-based alkali-activated foam concrete with a design density ranging from 200 kg/m3 to 1200 kg/m3. This material has shown good mechanical performance with compressive strength ranging from 0.50 MPa to 44.98 MPa and flexural strength ranging from 0.22 MPa to 13.86 MPa. Moreover, the use of fly ash and slag in this concrete has a positive effect on carbon reduction. Based on these findings, the present study aims to develop an ultra-low density lightweight construction material by combining 3D printing skeleton and alkali-activated foam concrete. The 3D printing skeleton provides a more stable structure with a lower density than the concrete itself. The usage of alkali-activated foam concrete reduces material production costs and carbon emissions. This novel material offers a durable, lightweight, and eco-friendly solution for a variety of practical applications. 
 
ABOUT THE SPEAKER
LIANG KAIKANG  is a PhD student of  City Univesity of Hong Kong, his research interests mainly focus on green building material, MD simulaiton, and alkali-activated material.