Effectiveness of a Simplified Pullout Test Using a Post-Installable Break-Off Bolt

The pullout test is known to be more reliable for estimating the strength of concrete structures under construction than other nondestructive testing methods such as the Schmidt rebound hammer test, penetration resistance test, and ultrasonic pulse velocity method. However, existing pullout tests re...

Full description

Saved in:
Bibliographic Details
Published in:Research in nondestructive evaluation 2013-01, Vol.24 (1), p.1-17
Main Authors: Lee, Ghang, Ko, Hunebum, Won, Jongsung
Format: Article
Language:English
Subjects:
Accuracy
Bolting
Bolts
Concrete construction
Concretes
Estimating techniques
Grooves
Mathematical analysis
Mathematical models
nondestructive test
Nondestructive testing
post-installable break-off bolt
pullout test
Regression analysis
Strength
Velocity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The pullout test is known to be more reliable for estimating the strength of concrete structures under construction than other nondestructive testing methods such as the Schmidt rebound hammer test, penetration resistance test, and ultrasonic pulse velocity method. However, existing pullout tests require several complex installation steps. Loading equipment that contains load cells is expensive. We propose a simplified pullout test using a post-installable break-off bolt, a standard bolt with a groove on the shaft, as an insert. The specific groove diameters of break-off bolts are designed to indicate concrete strength. However, the appropriate groove diameters for certain concrete strengths are not necessarily known. Regression models of groove diameter and the concrete strength were derived through a series of 188 experiments. The resulting equation showed 70.2% prediction accuracy for predicting concrete strength. The average difference between incorrect estimates and actual strengths was 0.13 mm, a magnitude that can easily be overcome if appropriate safety factors are studied and added to the prediction equations.
ISSN:0934-9847
1432-2110
DOI:10.1080/09349847.2012.675117