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The presented study utilize the powerful tools of PUNDIT apparatus to investigate the properties of boardcrete. Everyday tons of waste cardboard are discarded in landfills sites without recycling and CO2 emission in cement industries is increasing everyday which adds to environmental pollution and accelerate global warming. Keeping in view of these issues, an attempt is carried out in the form of boardcrete to address a sustainable building construction material which incorporate these waste cardboard as a partial replacement of concrete ingredient. Three different mix ratios of boardcrete blocks are presented in this research work and compare their compactness using ultrasonic pulse velocity. The result reveals that compactness of boardcrete blocks decreases with the increasing quantity of waste cardboard. Moreover, all the three types of boardcrete blocks has the tendency to be used as a soundproof, lightweight and economical building construction unit.