Sugarcane bagasse ash as supplementary cementitious material in cement composites: strength, durability, and microstruct
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ORIGINAL ARTICLE
Sugarcane bagasse ash as supplementary cementitious material in cement composites: strength, durability, and microstructural analysis Yogitha Bayapureddy1 · Karthikeyan Muniraj1 · Muni Reddy Gangireddy Mutukuru2 Received: 6 March 2020 / Revised: 11 April 2020 / Accepted: 3 May 2020 © The Korean Ceramic Society 2020
Abstract Agricultural wastes like sugarcane bagasse ash and rice husk ash can be reused as supplementary cement materials to produce eco-friendly buildings as plants of grass family contain more silica, which enhances the pozzolanic reactivity of the plant ashes. Researches so far were limited to evaluate the strength and few durability properties. This paper focuses on the reactivity among cement particles, a microstructural approach towards analyzing the material, and its performance. Compressive, splitting tensile strength tests, durability tests like water absorption and RCPT have been performed for 5%, 10%, 15%, and 20% replacement of sugarcane bagasse ash in cement. An increase in strength, less absorption, and low permeability were observed from 0 to 15% replacement. 15% replacement of SCBA in concrete cured for 56 days has shown maximum durable compared to other samples that are cured for 28 and 56 days. The enhanced performance of PPC owes to thick lattice formed due to compounds formed, which lead to the densification of concrete. Keywords Cement · Sugarcane bagasse ash · Pozzolanic activity · Rcpt · Micro structure
1 Introduction Cement composites consist of binder, water, aggregates, and other materials partially or fully possessing binding properties. The utilization of wastes helps in reducing the collection, transportation, and manufacturing costs of cement. In the recent Basel convention, the United Nations Environment Programme suggested using alternative raw materials containing Ca, Si, Al, and Fe to substitute clay, shale, and limestone [1]. Researches carried out to find alternatives for cement came forward with supplementation cement materials that possess similar properties of cement without compromising strength and durability. Industrial by-products like fly ash, red mud, silica fume, and metakaolin [2–8] and also agricultural wastes like rice husk ash, bagasse ash, * Yogitha Bayapureddy [email protected] 1
Department of Civil Engineering, Vignan’s Foundation for Science, Technology, and Research (Deemed to be University), Guntur, Andhra Pradesh 522213, India
Department of Civil Engineering, Andhra University, Visakhapatnam, Andhra Pradesh 530003, India
2
and palm oil fuel ash [9–12] were tested as replacements of concrete. Sometimes two or more materials are blended and tested as binary, tertiary composites [13, 14]. Sugarcane bagasse ash is waste material from the sugar factory has high calorific value, and so is used in boilers and for power generation in countries like Brazil, Philippines [15–17]. The high content of quartz is revealed in XRD analysis of sugarcane bagasse ash and rice husk ash by Cardeiro [18]. Effective reuse of bagasse ash
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