3 rd International Conference on Innovative Technologies for Clean and Sustainable Development (ITCSD2020) Chandigarh, India, February 19-21, 2020 © ITCSD2020 Physical and microstructural properties of Construction and Demolition Waste based masonry units Vivian Lawrence Sequeira 1,1 , Ashwin M Joshi 2,2 , Meghashree D Kerekoppa 3 , and Namratha Bharadwaj 4 1,3 Former Student - Infrastructure Construction Management, RASTA – Center for Road Technology, Bengaluru, India 2 Research Scholar, Civil Engineering Department, BMS College of Engineering, Bengaluru, India 4 Assistant Professor, BMS College of Architecture, Bengaluru, India 1 vivian.ls14@gmail.com 2 ashwinmjoshi@gmail.com 3 meghakerekoppa@gmail.com 4 namratha.b@bmsca.org ABSTRACT The aim of this study is to employ crushed Demolished Brick Masonry, a variety of Construction and Demolition Waste as a replacement for conventional construction materials (natural soil and aggregates) primarily in the production of three types of blocks, namely Solid Concrete Blocks, Stabilized Adobe Blocks and Stabilized Mud Concrete Blocks and also Controlled Low Strength Material. Long term strength of these specimens was studied at different ages to determine their performance. Scanning Electron Microscopy in addition to Energy Dispersive Spectroscopy and X- Ray Diffraction were used as tools to study the microstructure and identify the phases present in it. SEM revealed the presence of Calcium-Silicate-Hydrate Crystals and voids in the microstructure. In SCBs the distribution of CSH crystals was sparse compared to commercial concrete blocks due to the lower cement content employed. Significant differences could not be observed in the CSH arrangement among different proportions of SABs studied. The microstructure of CLSM was quite similar to that of SAB. SMCBs had a particularly dense network of CSH crystals compared to the other types of units. XRD indicated the presence of Anorthite, which was highest in SMCB and lowest in SAB. 1 Presenting 2 Corresponding author