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<p>The present study has arranged to investigate the performance of single and group anchor bolt systems embedded in HSC with or without polypropylene fiber (PPF). The relation between pull-out load (<i>P</i><sub><i>u</i></sub>) and non-destructive senses of Schmidt’s rebound number (SH) and ultrasonic pulse velocity (UPV) was also investigated. For this purpose a total of 120 cube specimens for single anchor bolt and 6 block specimens for group anchor bolts were tested. Three anchor bolts (12, 16 and 20&#xa0;mm diameter) with embedded depths of 50&#xa0;mm and 70&#xa0;mm were used. Each embedded anchor was subjected to impact force to measure SH, followed by the UPV assessment and then tested for <i>P</i><sub><i>u</i></sub>. With regard the single anchor system, there was <i>P</i><sub><i>u</i></sub> enhancement because of PPF addition to HSC by an average ratio of 0.2–8.7% and 2.4–5.6% for anchors with embedded depths of 50&#xa0;mm and 70&#xa0;mm respectively. <i>P</i><sub><i>u</i></sub> and SH was found to have a strong correlation with R<sup>2</sup> between 0.811 and 0.917, and in contrast, there is a poor correlation between <i>P</i><sub><i>u</i></sub> and UPV. The use of PPF has a positive impact on group anchor bolts that are embedded in HSC at a shallow depth of 50&#xa0;mm. <i>P</i><sub><i>u</i></sub> could be predicted reasonably using Multi Logistic Regression Model depending on the bolt anchor properties, SH and UPV values for HSC with or without PPF. The proposed equation for the pull-out assessment is a good tool for the structural designer to assess the health of anchor system in HSC with or without PPF. It is recommended to use a reduction factor of 0.69 for the equation proposed to assess <i>P</i><sub><i>u</i></sub> for single anchor to be applied on group anchor system.</p>

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Performance of single and group anchors embedded in polypropylene fiber high strength concrete and relation with non-destructive response

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Azad A. Mohammad,
  • Lawand D. Ahmed

摘要

The present study has arranged to investigate the performance of single and group anchor bolt systems embedded in HSC with or without polypropylene fiber (PPF). The relation between pull-out load (Pu) and non-destructive senses of Schmidt’s rebound number (SH) and ultrasonic pulse velocity (UPV) was also investigated. For this purpose a total of 120 cube specimens for single anchor bolt and 6 block specimens for group anchor bolts were tested. Three anchor bolts (12, 16 and 20 mm diameter) with embedded depths of 50 mm and 70 mm were used. Each embedded anchor was subjected to impact force to measure SH, followed by the UPV assessment and then tested for Pu. With regard the single anchor system, there was Pu enhancement because of PPF addition to HSC by an average ratio of 0.2–8.7% and 2.4–5.6% for anchors with embedded depths of 50 mm and 70 mm respectively. Pu and SH was found to have a strong correlation with R2 between 0.811 and 0.917, and in contrast, there is a poor correlation between Pu and UPV. The use of PPF has a positive impact on group anchor bolts that are embedded in HSC at a shallow depth of 50 mm. Pu could be predicted reasonably using Multi Logistic Regression Model depending on the bolt anchor properties, SH and UPV values for HSC with or without PPF. The proposed equation for the pull-out assessment is a good tool for the structural designer to assess the health of anchor system in HSC with or without PPF. It is recommended to use a reduction factor of 0.69 for the equation proposed to assess Pu for single anchor to be applied on group anchor system.