Sustainable use of ﬂy ash and waste marble slurry powder in concrete Vishal Singhal ⇑ , Ravindra Nagar, Vinay Agrawal Malaviya National Institute of Technology, Jaipur 302017, India article info Article history: Received 15 December 2019 Received in revised form 21 May 2020 Accepted 25 May 2020 Available online xxxx Keywords: Fly ash concrete Marble slurry powder Fresh properties DIN water permeability Sustainable concrete abstract The waste marble slurry generated from cutting and processing units becomes airborne after drying due to its ﬁne particle size. This ﬁne marble slurry Powder (MSP) causes environmental problems in nearby areas. Also, a huge quantity of ﬂy ash (FA) is being generated from thermal power plants as a by-product. In this study, FA and waste MSP was used as partial replacement of cement and river sand in concrete respectively. One control and four replacement mixes were cast. In the replacement mixes, 30% cement was partially substituted by FA and natural sand was partially (0, 10, 20 and 30%) substituted by MSP. Water to binder ratio (w/b) of 0.35 was opted for mix design. All ﬁve mixes were tested for fresh and hardened properties of concrete and results were compared. The result indicates that incorporation of FA improves the workability however MSP decreases the workability of concrete. Also, it may be con- cluded that 30% incorporation of FA reduces the strength although up to 20% replacement of natural sand with waste MSP improves the mechanical properties of concrete. Durability property of replacement con- crete was improved as compared to control concrete for all mixes. Ó 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientiﬁc committee of the 3rd International Con- ference on Innovative Technologies for Clean and Sustainable Development. 1. Introduction Nature has provided various types of dimensional stones like marble, granite, sandstone, Kota stone, slate, quartzite, etc. These stones are used for construction, sculpturing and decoration pur- poses. Marble is one of the popular stone used to fulﬁl these pur- poses. In 2007, 71% of marble was produced by China, India, Turkey, Italy, Iran, Spain and Brazil. The stone industry of Rajasthan has around 85% production capacity of total marble produced in India [1]. The demand for marble is increasing gradually. An increase in the demand for marble stone led to increase in the pro- duction of marble, which on one hand supports the economy on other hand waste produced from this industry causes many envi- ronmental, ecological and health issues [2]. This waste can be clas- siﬁed into two categories that is mining or quarrying waste and processing waste. Around 50% of the mined marble becomes waste during the process of mining to ﬁnishing marble. These wastes are in the form of boulders, grits, ﬁnes, and slurry. Management of these wastes is a serious problem for the stone industry. These wastes require a large area of land for disposal. Slurry becomes airborne after drying and causes respiratory and eye problems to living beings in the surrounding areas. Another side, concrete pro- duction is also facing a lack of availability of sand as Government of India has banned sand extraction from river beds [3]. Cement man- ufacturing process emits a huge quantity of greenhouse gases in the environment. Hence pozzolanic materials like ﬂy ash, are being suggested to use in concrete as partial replacement of cement. Fly ash is produced from the combustion of coal as a by-product. Ther- mal power plants are the major source of ﬂy ash production. To overcome the above mentioned issues related to cement and stone industry, many researchers have tried to use marble wastes and ﬂy ash in building construction materials. 1.1. Literature review Kore and Vyas [4] studied the effect of natural coarse aggregate replacement by crushed marble waste coarse aggregate. Results indicate that 75% of conventional coarse aggregate replacement by crushed marble waste coarse aggregate shows a reduction in the mechanical strength of the concrete produced as compared to controlled concrete. Water permeability was reduced by 8.22% and abrasion resistance was improved with the use of crushed marble aggregate. Rodriguesa et al. [5] observed the inﬂuence of the use of very ﬁne marble sludge as a cement substitute. The result shows a reduction in the workability. Also, Mechanical https://doi.org/10.1016/j.matpr.2020.05.650 2214-7853/Ó 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientiﬁc committee of the 3rd International Conference on Innovative Technologies for Clean and Sustainable Development. ⇑ Corresponding author. E-mail addresses: 2016rce9028@mnit.ac.in, svsinghal@gmail.com (V. Singhal). Materials Today: Proceedings xxx (xxxx) xxx Contents lists available at ScienceDirect Materials Today: Proceedings journal homepage: www.elsevier.com/locate/matpr Please cite this article as: V. Singhal, R. Nagar and V. Agrawal, Sustainable use of ﬂy ash and waste marble slurry powder in concrete, Materials Today: Proceedings, https://doi.org/10.1016/j.matpr.2020.05.650