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Title: Characterization and Quality Assessment of Brine Sludge Based Geopolymer Bricks
Authors: Singh, Souravpreet
Supervisor: Gupta, Vivek
Bansal, Prem Pal
Keywords: Brine Sludge;Mineral phase Characterization;Geopolymer bricks;Raman spectroscopy;Efflorescence
Issue Date: 5-Oct-2023
Abstract: Burnt clay brick is still being used at large scale for masonry construction in building structures. The major shortcoming is the carbon emission during production of these burnt clay bricks. Now a days, cement based fly ash bricks are replacing conventional bricks as a sustainable alternative. However, in these bricks, cement as binder carries high carbon emission during its production and water required for curing of these bricks further creates a need to develop more sustainable masonry unit for building construction. Waste utilization is an effective approach for enhancing the sustainability of construction products. In this study, brine sludge waste is used as an ingredient in fly ash bricks to enhance its sustainability. Brine sludge is a by-product of the chlor-alkali industries that is created during the electrolysis of brine to produce chlorine and caustic soda. Significant research and development of various cement-free geopolymeric materials that incorporate different wastes have taken place over the past ten years. Converting the waste into value-added materials presents an innovative and sustainable approach. This study primarily focuses on development of cement free bricks with high volume of brine sludge in a cost-effective manner which can be used over the conventional ones. The research investigates the mechanical strength, durability, and mineralogy of brine sludge based geopolymer bricks. Various mixes are formulated with 70% brine sludge and 30% fly ash as a geopolymeric precursor and concentrations of alkaline activators have been varied for both volume based and weight based design mixes. The precursor to fine aggregate ration has been maximized to 1:3 and stone dust is used as a fine aggregate for cost effectiveness of the product. Firstly, flowable mortar has been formulated and then liquid content is reduced to get the low moist mortars for feasibility of compressed bricks. Mixes have been optimized based on the compressive strength and bricks with optimized mixes have been tested for wet compressive strength, water absorption, efflorescence and mineralogy. The mineralogy of raw materials and the bricks have been studied using X-Ray Diffraction, Fourier transform Infrared spectroscopy and advanced characterization technique i.e. Raman Spectroscopy. The results demonstrate the feasibility of brine sludge as an ingredient into cement free geopolymer bricks while maintaining adequate structural integrity and durability. The optimized mix having material cost ~INR 10.0 complies the standard requirements of Class 7.5 bricks.
Appears in Collections:Masters Theses@CED

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