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http://dx.doi.org/10.7843/kgs.2015.31.3.5

Tensile Strength Characteristics of Cement Paste Mixed with Fibers  

Park, Sung-Sik (Dept. of Civil Engrg., Kyungpook National Univ.)
Hou, Yaolong (Dept. of Civil Engrg., Kyungpook National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.31, no.3, 2015 , pp. 5-16 More about this Journal
Abstract
The characteristics of tensile strength of fiber-reinforced grouting (cement paste) injected into rocks or soils were studied. A tensile strength of such materials utilized in civil engineering has been commonly tested by an indirect splitting tensile test (Brazilian test). In this study, a direct tensile testing method was developed with built-in cylinder inside a cylindrical specimen with 15 cm in diameter and 30 cm in height. The testing specimen was prepared with 0%, 0.5%, or 1% (by weight) of a PVA or steel fiber reinforced mortar. A specimen with 5 cm in diameter and 10 cm in height was also prepared and tested for the splitting tensile test. Each specimen was air cured for 7 days or 28 days before testing. The tensile strength of built-in cylinder test showed 96%-290% higher than that of splitting tensile test. The 3D finite element analyses on these tensile tests showed that the tensile strength from built-in cylinder test had was 3 times higher than that of splitting tensile test. It is similar to experimental result. As an amount of fiber increased from 0% to 1%, its tensile strength increased by 119%-190% or 23%-131% for 7 days or 28 days-cured specimens, respectively. As a curing period increased from 7 days to 28 days, its strength decreased. Most specimens reinforced with PVA fiber showed tensile strength 14%-38% higher than that of steel fiber reinforced specimens.
Keywords
Tensile strength; Built-in cylinder; Split tensile test; Grouting; Fiber;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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