Analysis of the strain-rate behavior of a basalt fiber reinforced natural hydraulic mortar |
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| Affiliation: | 1. Dept. of Structures for Engineering and Architecture, University “Federico II”, Naples, Italy;2. Dept. of Chemical, Materials and Production Engineering, University “Federico II”, Naples, Italy;3. University of Applied Sciences of Southern Switzerland, Lugano, Switzerland;1. Department of Civil Engineering, Electronic Branch, Islamic Azad University, Tehran, Iran;2. Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;3. Department of Civil Engineering, University Technology Malaysia, Johor Bahru, Malaysia;1. Materials Science Institute of Madrid (ICMM), CSIC, Sor Juana Inés de la Cruz 3, Cantoblanco, 28049 Madrid, Spain;2. National Centre for Metallurgical Research (CENIM), CSIC, Avda. Gregorio del Amo 8, 28040 Madrid, Spain;3. Corrosion and Metallurgy Study Centre “A Daccò”, University of Ferrara, Via Saragat 1, 44122 Ferrara, Italy;1. Department of Structural Engineering, Hefei University of Technology, Hefei 230009, China;2. Department of Civil and Environmental Engineering, University of California, Irvine, CA 92697, USA;3. Key Laboratory of Performance Evolution and Control for Engineering Structures, Tongji University, 1239 Siping Road, Shanghai 200092, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, PR China;2. Guizhou Linmei Materials Co., Ltd., Guiyang 550023, PR China |
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| Abstract: | Fiber reinforced inorganic materials, such as concrete or mortars are expected to present good mechanical properties under high dynamic loading conditions, such as those induced by earthquakes. Furthermore, basalt fibers, which are being increasingly investigated in structural applications, are also expected to present good performance under high strain-rate conditions.This paper presents the results of a dynamic characterization of a basalt fiber reinforced natural hydraulic mortar, in order to verify its capability to withstand high dynamic loading conditions. In particular, the reinforced mortar was morphologically characterized by SEM and mercury intrusion porosimetry; then, quasi-static flexural and tensile tests were conducted. Finally, dynamic tensile failure tests were carried out at medium and high strain-rates, using a Hydropneumatic machine and a Modified Hopkinson bar apparatus, respectively. The results were elaborated to derive Dynamic Increase Factors for the tensile strength.The fiber addition leads to a bridge action effect, and consequently to a more ductile behavior and higher toughness of the fiber reinforced mortar compared to a plain mortar. In addition, the fiber reinforced mortar appears to be highly strain-rate sensitive, as the tensile strength DIF increased up to 5.1, for a high strain-rate of about 102 s−1. |
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| Keywords: | Basalt fiber Restoration mortar Dynamic Increase Factor Hopkinson bar Strain-rate |
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