Evaluation of a new bond-type anchorage system with expansive grout
\nfor a single FRP rod
\nYasir M. Saeed a,\u21d1, Salam M. Al-Obaidi b,c, Ehab G. Al-hasany d, Franz N. Rad e
\na Department of Civil and Environmental Engineering, Portland State University, P. O. Box 751, Portland, OR 97207, United States
\nb Roads and Transportations Engineering Department, University of Al-Qadisiyah, Diwaniyah, Iraq
\nc Department of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy
\nd World Bank Financed Projects, Ministry of Education, Baghdad, Iraq
\ne Civil and Environmental Engineering, Arthur M. James Professor of Structural Engineering, Department of Civil and Environmental Engineering, Portland State University, OR,
\nUnited States
\nh i g h l i g h t s
\n Pullout tests were conducted on twelve CFRP bond-type anchors and eight specimens with built-in anchors.
\n The effects of bond length, rod-to-anchor diameter ratio, and curing time were investigated.
\n The anchor length must not be less than 32- and 30-times rod diameter for #3 (10 mm) and #4 (13 mm) CFRP rods.
\n Results obtained from numerical analysis are in good agreement with the experimental results.
\na r t i c l e i n f o
\nArticle history:
\nReceived 2 February 2020
\nReceived in revised form 14 June 2020
\nAccepted 17 June 2020
\nAvailable online 2 July 2020
\nKeywords:
\nAnchors
\nBond-type anchorage
\nCFRP
\nConcrete
\nExpansive grout
\nPrestressed concrete
\na b s t r a c t
\nPrestressed concrete applications require a high strength prestressing material that could apply and
\nmaintain effective compressive force to concrete members. Although fiber reinforced polymer (FRP)
\nmaterials, especially carbon FRP (CFRP), have the desired strength, no efficient system for its anchorage
\nto concrete has been devised yet. This paper presents an experimental evaluation on a new bond-type
\nanchorage system using an expansive grout as a filling material to anchor CFRP rods. A total of twelve
\nspecimens were fabricated and tested. Short-term and long-term pullout tests were performed. The
\nCFRP rods were 0.375 in. (10 mm) and 0.50 in. (13 mm) in diameter. The parameters investigated were
\nthe bond length, rod diameter, and curing time of the expansive grout. The experimental results showed
\nthat 12 in. (305 mm) and 15 in. (381 mm) were adequate bond lengths to effectively anchor the 0.375 in.
\n(10 mm) and 0.50 in. (13 mm) CFRP rods, respectively. The results also indicated that the anchor strength
\nand stiffness were directly proportional to the bond length, and cross-sectional area ratio of CFRP rods to
\nanchor borehole affected the stiffness and bonding capacity of the proposed anchor. Finally, a numerical
\nanalysis was carried out to predict the tensile behavior of FRP anchors. The numerical results had good
\nagreement with the experimental results.
\n 2020 Elsevier Ltd. All rights reserved.<\/p>\n","protected":false},"excerpt":{"rendered":"