Performance Evaluation of Cost-Effective Non-autoclaved Aerated Geopolymer (NAAG) Blocks
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RESEARCH ARTICLE-CIVIL ENGINEERING
Performance Evaluation of Cost-Effective Non-autoclaved Aerated Geopolymer (NAAG) Blocks Rupali B. Kejkar1 · Amit Madhukar1 · Rashi Agrawal1 · Swapnil P. Wanjari1 Received: 10 February 2020 / Accepted: 24 April 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract Owing to the increased population in developing country like India, the demand of sustainable building material is likewise increased to meet its excessive consumption. In the present study, non-autoclaved aerated geopolymer (NAAG) blocks were developed using industrial waste [fly ash, granulated blast furnace slag (GGBS)], foam and aerating agents with less concentration of alkaline solution (i.e. 1.5–4 M) and tested for their physio-mechanical properties. These NAAG blocks achieved up to 13.5 MPa compressive strength. Optimized samples were tested for thermal and durability related properties. Performance evaluation of NAAG blocks exhibited low thermal conductivity and durable nature as compared to the clay bricks. This developed NAAG block is proven to be a cost-effective and energy effective solution and can be used as building material. Keywords Industrial waste · Alkaline solution · Aerating agents · Lightweight geopolymer blocks · Mechanical properties · Durability properties
1 Introduction Science and technology have opened vistas of celestial blessings, and there are hoards and multitudes of newer innovative formulas that can be tested and that can spell a revolution by newer cheaper additions to the options available for the concrete city building material in any developing country. Use of industrial waste generated in alkali-activated materials is widely promoted, and this unlocks the potential of producing sustainable and cost-effective products thus opening doors for newer innovative options. For lightweight material, autoclaved aerated concrete (AAC) block technique gained attraction due to its good mechanical properties and thermal insulation [1]. Manufacturing of AAC blocks and geopolymer products at high curing temperature, pressure, curing duration and alkaline concentration required high embodied energy and cost [2]. Multiple studies have been carried out in the past in order to determine and characterize the behaviour of geopolymer material and AAC individually. Not much of literature is available on aerated geopolymer material [3, 4].
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Rupali B. Kejkar [email protected] Department of Civil Engineering, Visvesvaraya National Institute of Technology, Nagpur 440010, India
From previous studies on geopolymer material, compressive strength of 20.3 MPa was observed at a curing temperature of 70 °C for 24 h with alkali concentration of 12 M [5], and up to 45 MPa was observed by addition of 5% silica fumes at curing temperature of 800 °C for 2 h [6]. Also compressive strength of 40 MPa to 58 MPa was observed with higher concentration (i.e. 10–14 M) at 60–100 °C curing temperature [7]. Furthermore, previous studies on aerated block, i.e. AAC specimen produced 13.3 MPa compr
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