Mechanical properties of lime-treated clay reinforced with different types of randomly distributed fibers
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ICCESEN 2017
Mechanical properties of lime-treated clay reinforced with different types of randomly distributed fibers Aslı Boz 1 & Alper Sezer 1
&
Tuba Özdemir 1 & Gül Ece Hızal 1 & Özlem Azdeniz Dolmacı 1
Received: 16 November 2017 / Accepted: 28 February 2018 # Saudi Society for Geosciences 2018
Abstract In this paper, a comparative experimental study was carried out to evaluate the effect of inclusion of different fiber types on strength of lime-stabilized clay. In this scope, a series of unconfined compressive strength tests were carried out on specimens including basalt and polypropylene fiber compacted under Standard Proctor effort (i.e., 35% by weight of soil). The effects of curing period (1, 7, 28, and 90 days), fiber type (basalt and polypropylene), fiber content (0, 0.25, 0.5, 0.75, 1%), fiber length (6, 12, and 19 mm), and lime content (0 and 9%) on strength properties were investigated. The results revealed that both basalt and polypropylene fibers increased the strength without inclusion of lime. For specimens including lime, strength of polypropylene fiber-reinforced specimens was remarkably higher than that reinforced with basalt fiber for lime-stabilized clay. However, greatest strength improvement was obtained by use of 0.75% basalt fiber of 19 mm length with 9% lime content after 90-day curing. Additionally, results of strength tests on specimens including 3 and 6% lime and 12-mm basalt fiber after 1, 7, 28, and 90day curing were presented. It is evident that the use of 6-mm basalt fiber and 12-mm polypropylene fiber were the best options; however, efficiency of fiber inclusion is subject to change by varying lime contents. It was also observed that the secant modulus was increased by use of lime; however, strength of the correlations among secant modulus and unconfined compressive strength values was decreased by increasing amount of lime for specimens including both basalt and polypropylene fibers. Keywords Basalt fiber . Polypropylene fiber . Lime stabilization . Unconfined compressive strength . Clay stabilization . Reinforcement
Introduction Due to its low bearing capacity and high compressibility, generally, clay is not preferred as a foundation soil. Particularly, the bearing capacity of subbase of a layered pavement system should be sufficiently large to transfer the traffic loads to deeper layers, and probable settlements will affect the engineering behavior and service life of base course, subbase, and wearing courses. To date, various improvement techniques have been utilized to provide developments in engineering properties of clays. Utilization of waste materials in soil improvement is an environmental-friendly option (Yilmaz et al. This article is part of the Topical Collection on Geo-Resources-EarthEnvironmental Sciences. * Alper Sezer [email protected] 1
Department of Civil Engineering, Ege University, Izmir, Turkey
2015; Yilmaz and Yurdakul 2017); however, soil reinforcement by use of fiber is one of the most preferred and beneficial ground improvement methods since
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