US 11,662,284 B2Granted

Method for evaluating anchor bolt embedment in concrete

AssigneeImam Abdulrahman Bin Faisal University

InventorMuhammad Saleem

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Abstract

A tester for evaluating pullout load capacity and bond quality of anchor bolts embedded in concrete includes a Schmidt hammer for measuring a rebound number and an ultrasonic pulse velocity tester for measuring the transit time of a pulse transmitted through concrete surrounding an anchor bolt. The rebound number and the transit time are combined and matched against a database record which identifies the pullout load capacity and the bond quality. The transit time is matched to thresholds of transit times associated with porosity, internal cracking, air voids, and water pockets located around the embedded anchor bolt. The Schmidt hammer is further modified by the incorporation of a digital level for measuring the vertical and horizontal angles of inclination of the plunger with the concrete surface, a guide tube for supporting the plunger, and by using a convex plunger tip for improved registration with anchor bolt head.

Claims7

Dependent claims

A non-destructive testing method for evaluating the pullout load capacity and bond quality for an anchor bolt embedded in concrete, comprising:

centering a plunger of a Schmidt hammer on the anchor bolt;
impacting the anchor bolt with the plunger of the Schmidt hammer;
measuring a rebound number of the anchor bolt embedded in the concrete with the Schmidt hammer;
transmitting the rebound number to a controller connected to the Schmidt hammer;
measuring an ultrasonic pulse transit time in the concrete surrounding the anchor bolt by using an ultrasonic pulse velocity tester;
measuring an angle of inclination of the plunger with a digital level connected to Schmidt hammer;
correcting the rebound number based on the angle of inclination of the plunger;
transmitting the corrected rebound number to the controller;
estimating the pull out load carrying capacity of the installed anchor bolt by correlating the rebound number with the ultrasonic transit time;
and
evaluating the bond quality of the embedded anchor bolt with the concrete.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/569,094Filed 5 Jan 2022 · continuation
Priority: 12 Dec 2017
Published: US 2022/0136945 A15 May 2022
Granted: 30 May 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

G01N 3/14
By applying steady tensile or compressive forces: generated by dead weight, e.g. pendulum; generated by springs tension
G01M 1/00
Testing static or dynamic balance of machines or structures
G01N 29/07
Analysing solids: by measuring propagation velocity or propagation time of acoustic waves
G01N 33/383
Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass: concrete or cement

Family

Application62/597,801Us provisional application · filed 12 Dec 2017
Application16/198,078Parent of this continuation · filed 21 Nov 2018
Application17/197,178Parent of this continuation · filed 10 Mar 2021
US 10,969,315 B2Parent of this continuation · filed 6 Apr 2021
US 2022/0136945 A1Pre-grant publication · published 5 May 2022
US 11,293,845 B2Parent of this continuation
US 2019/0178765 A1Published application
US 2021/0190654 A1Published application
US 11,662,284 B2This patent

From the US filing history. Foreign family members aren’t listed.