PSI - Issue 70

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ScienceDirect

Procedia Structural Integrity 70 (2025) 650–657

Structural Integrity and Interactions of Materials in Civil Engineering Structures (SIIMCES-2025) Sustainable Unburnt Bricks Manufactured Using Construction Demolition and Industrial Wastes M. Vignesh a , I. Yamini Sreevalli a, * a School of Civil Engineering, Vellore Institute of Technology Chennai Campus, Chennai-600127, India Abstract FaL-G bricks, Fly ash bricks and geopolymer bricks are few sustainable alternatives to burnt clay bricks. A typical fly ash brick comprises of flyash, sand and lime. Recently, powdered construction demolition waste (CDW) was found to have good pozzolanic property and can be a substitute for the cementitious materials like flyash. Chemical analysis of Waste Foundry Sand (WFS) reveals suitable content of silica which makes it a possible substitute for river sand and quarry dust, this replacement conserves natural resources that are being spent in construction. Waste marble powder (WMP) obtained from marble rock quarries has considerable amount of Calcium oxide (CaO) in it, which makes it a possible replacement for lime in unburnt brick manufacturing. Hence in this study unburnt bricks are manufactured using flyash, powdered CDW, WFS, WMP and Lime. Strength Activity Index (SAI) test conducted in this work revealed the lack of pozzolanic activity in CDW and WFS. Experimental study was conducted to examine the optimum quantity of CDW, WFS and WMP in the manufacturing of unburnt bricks. Results show CDW can be added in the range of 10-20%, WMP can be added upto 15% as a replacement for lime and WFS can be added upto 20% (i.e.,) it can completely replace river-sand and M-sand in the manufacture of unburnt bricks. Mix combination containing, 60% FA, 15% WMP, 20% WFS and 5% Lime gave the compressive strength of 9.13 MPa. Proportion of CDW by 10% as filler in the mix CD10FC50WM5 gave strength of 7.29MPa. Addition of WMP, CDW and WFS will make the production of unburnt bricks to be eco-friendly and sustainable by reducing the usage of cement, lime and sand .

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of International Conference on Structural Integrity Organizers

Keywords: Construction demolition wastes (CDW); Waste Marble Powder (WMP); Waste Foundry Sand (WFS); Strength Activity Index (SAI).

* Corresponding author. Tel.: +91-928-333-7304. E-mail address: yaminisreevalli.i@vit.ac.in

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of International Conference on Structural Integrity Organizers 10.1016/j.prostr.2025.07.102