Lightweight Pumice Mortars with Polypropylene Fiber Reinforcement
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RESEARCH ARTICLE-CIVIL ENGINEERING
Lightweight Pumice Mortars with Polypropylene Fiber Reinforcement Niyazi Ugur Kockal1 · Hasan E. Camurlu2 Received: 11 July 2019 / Accepted: 5 May 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract The use of porous particles as aggregates in cementitious mixes presents advantages such as reducing dead load and assisting in thermal insulation of constructions. Pumice aggregates are most commonly used because they are cheap, natural and easily obtainable. However, there are also disadvantages such as brittle behavior and decrease in strength. In this study, 0, 1 and 2 vol% polypropylene fibers (PF) having 40 micrometer diameter were used in the production of mortars containing acidic (AP) and basaltic pumices (BP) in place of calcareous sand (CS), in order to overcome these challenges. In addition to mechanical properties (compressive, flexural and splitting tensile strength), physical properties (bulk density and capillarity) and morphology of mortars (scanning electron and optical microscopy) were also investigated. The results showed that bulk density of BP mortars was about 10% lower and that of AP mortars was about 15% lower than that of CS mortars. Flexural strength of BP and CS mortars were over 7 MPa, whereas that of AP mortars were in 4–6 MPa range. Addition of 1% PF improved the mechanical properties, whereas addition of 2% PF resulted in a decrease in strength in all mortar types. The highest 1-year compressive strength was obtained by the BP sample having 1% PP fiber. Furthermore, there was a strong relationship between the strength and bulk density of mortars. Keywords Lightweight aggregate · Pumice · Lightweight mortar · Polypropylene fiber
1 Introduction Lightweight aggregates used in lightweight concrete and mortar can be of artificial or natural origin. Raw materials for artificial aggregates include ground slag, fly ash and sewage sludge etc., whereas natural ones contain vermiculite, perlite, pumice, scoria and wood sawdust, etc.[1]. Although artificial aggregates give satisfactory responses in most of the desired properties [2–4], they are inherently expensive since their production comprises of successive grinding, forming and heating steps, such as in ground slag. Natural aggregates, such as pumice, are cheaper, and therefore, they bring about the cost reduction for constructions. Utilization of low-cost and lightweight natural aggregates such * Niyazi Ugur Kockal [email protected] Hasan E. Camurlu [email protected] 1
Civil Engineering Department, Akdeniz University, Antalya, Turkey
Mechanical Engineering Department, Akdeniz University, Antalya, Turkey
2
as pumice in concrete attracts scientific and technological attention; therefore, there is an increasing research on pumice aggregate containing concrete and mortar [5–8]. Pumice is a volcanically originated material that forms by incorporation of gas bubbles in solidifying lava. It is an aluminosilicate with a porous structure. It is found naturally in countries of h
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