BIS: Integrating C&D Waste into Building Materials with Quality Control
Sanjay Pant, DDG, BIS, discusses the integration of C&D waste into building materials, focusing on standards and the challenges of maintaining quality, particularly in durability and consistency. He mentions the revisions to IS 383, which now include provisions for using C&D-derived aggregates.
Aggregate from Construction and Demolition (C&D) waste falls under the category of recyclable materials. For instance, there are various types of cement today that utilize fly ash or slag as supplementary cementitious materials, which can also be incorporated directly into concrete. Additionally, we have a range of other materials like bricks and blocks, and significant innovations have been made in this area. For example, there are standards like IS 12894 for fly ash lime bricks, IS 13757 for fly ash clay bricks, and IS 16720 for fly ash cement bricks. These standards support the extensive use of fly ash. Other examples include concrete blocks, both hollow and solid, lightweight aggregate-based blocks, preformed foamed concrete blocks, and autoclaved aerated concrete (AAC) blocks. There's also IS 12440, which allows the use of stone waste to partially replace concrete matrices, leading to the production of stone concrete masonry blocks.
