Mechanical and Rheological Properties of Self-Compacting Concrete Containing Al 2 O 3 Nanoparticles and Silica Fume
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RESEARCH PAPER
Mechanical and Rheological Properties of Self‑Compacting Concrete Containing Al2O3 Nanoparticles and Silica Fume Azad Faez1 · Arash Sayari1 · Salar Manie1 Received: 27 July 2019 / Accepted: 27 December 2019 © Shiraz University 2020
Abstract In this paper, an experimental study of the mechanical and rheological properties of self-compacting concrete (SCC) containing Al2O3 nanoparticles (AL2O3 NPs) and silica fume (SF) has been investigated. In order to evaluate the fresh properties of concrete, Slump flow, V-funnel, and L-box tests have been conducted. The hardened concrete properties have been investigated using compressive and tensile strength tests. Also, water absorption of specimens has been evaluated using the water absorption test. Thirteen different amounts of AL2O3 NPs (0, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.25, 2.5, 2.75, and 3%) as a substitute of cement were used. The amount of SF in all specimens is considered constant. According to the tests, the compressive strength of specimens containing 2.5% AL2O3 NPs as partial cement replacement after 7, 28, and 90 days is increased by 47, 88, and 86%, respectively. The reason for this enhancement is the reactivity of the AL2O3 NPs with Portland cement during the hydration process of cement. Also, the splitting tensile strength of specimens containing 2.5% AL2O3 NPs and 10% SF as partial cement replacement after 7, 28, and 90 days is increased by 29, 55, and 47%, respectively. On the other hand, the use of 1 and 2% of aluminum nanoparticles also reduced water absorption by 10% and 45%, respectively. In other words, the use of SCC in SCC containing silica fume has a positive effect and can be effective in cases where low water absorption is required. Keywords Self-compacting concrete · Aluminum oxide nanoparticles · Silica fume · Compressive strength · SEM
1 Introduction In projects where the congested reinforcement is high and the dimensions of the concrete section are small, selfcompacting concrete (SCC) can be used as an appropriate method which provides flowability, stability, and concrete ability to pass between reinforcements (Tichko et al. 2015; Kamal et al. 2018; Ghasemi et al. 2019). In recent years, with the development of nanotechnology, numerous studies have been carried out on the effects of nanoparticles in improving concrete properties. (Li et al. 2017; Langaroudi and Mohammadi 2018; Grzeszczyk et al. 2019; Calvo * Arash Sayari [email protected] Azad Faez [email protected] Salar Manie [email protected] 1
Department of Civil Engineering, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran
et al. 2019; Diab et al. 2019; Zhang et al. 2019). Moreover, improving the technical properties of concrete by the use of nanoparticles reduces the negative environmental effects of concrete production. This is due to increasing strength and reducing demand for cement production and consumption. Nanoparticles with conventional mineral additives can significantly improve the properties of SCC. Therefore, it is
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