Fresh Properties of Fiber Reinforced Cement-Based Foam with Pozzolans
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RESEARCH PAPER
Fresh Properties of Fiber Reinforced Cement‑Based Foam with Pozzolans Farnaz Batool1 · Vivek Bindiganavile2 Received: 30 July 2019 / Accepted: 24 January 2020 © Shiraz University 2020
Abstract This paper investigates the fresh properties of cement-based foam reinforced with fibers and examines the influence on density, pozzolan, spreadability, and flowability. Here, marsh and flow cone testing were employed for measuring the flowability and spreadability. This testing was conducted on seven series of cement-based foam mixtures prepared by adding polypropylene (PP) microfibers at the volume fraction of 0.2% in 800, 600, and 400 kg/m3 cast densities. In six series, the 10% and 20% of cement were replaced by fly ash, silica fume, and metakaolin, respectively. The results showed that the slurry flow time increases in the presence of polypropylene fibers and pozzolans, with metakaolin blended mixtures, recorded the longest time. Similarly, an increase in the foam volume was noticed in all mixtures except for the metakaolin series with higher substitution. Also, it was observed that the spread diameter reduces in fiber reinforced cement-based foam mixtures, but for fly ash series increase was noticed. Based on these results, models were developed for predicting the foam volume and spreadability for mixtures with pozzolan and polypropylene fibers. Keywords Cement-based foams · Spreadability · Flowability · Polypropylene fibers
1 Introduction Cement-based foam is mainly cement paste or mortar in which an air-void network is introduced deliberately by adding a preformed foam. This composite is attractive for semi-structural purposes, primarily due to low density and insulating properties, as cement-based foam inherently is brittle in nature with low tensile and compressive strength. Therefore, different studies have attempted (Zollo and Hays 1998; Ramamurthy et al. 2009; Amran et al. 2015; Bindiganavile and Hoseini 2008) to improve the hardened properties of foamed concrete with the addition of polypropylene fibers. These investigations have reported significant enhancement in the mechanical, physical, and fresh properties. Recently, Amran et al. (2015) reported a change in the behavior of foamed concrete from brittle to ductile (elastic–plastic) with the addition of fibers. Moreover, significant * Farnaz Batool [email protected] 1
Department of Civil Engineering, NED University of Engineering & Technology, Karachi, Pakistan
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada
2
improvement in the crack width was reported by Papayianni and Milud (2005) with the inclusion of polypropylene fiber and fly ash in foamed concrete. Though Ramamurthy et al. (2009) have reported a reduction in flowability of foamed concrete mixtures with the addition of fibers. The polypropylene fibers had proven to be most compatible with the cement-based foam matrix (Bindiganavile and Hoseini 2008; Li et al. 2018; Karahan and Atiş 2011) in comparison with other fibers. Achieving
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