Post-installed screws for in-situ assessment of mortar strength

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Title: Post-installed screws for in-situ assessment of mortar strength
Authors: Sourav, Shah Nur Alam
Al-Sabah, Salam
McNally, Ciaran
Permanent link: http://hdl.handle.net/10197/9037
Date: 18-Jun-2017
Abstract: For capacity evaluation, the structural assessment of existing structures is necessary. Concrete strength is an important parameter for such assessment. Non-destructive tests (NDTs) are used along with the traditional approach of core testing for strength assessment of concrete in existing structures. The low reliability of NDT results leads to uncertainty in assessing concrete strength. A new method of non-destructive testing is presented in this paper with the aim of achieving better reliability and reducing uncertainty in the assessment of mortar strength. This approach is based on a modified pullout of post-installed screw anchors. The technique involves a pushin mechanism for a steel screw inside the mortar where a void underneath the screw is left to allow for the uninterrupted movement of the screw inside the concrete. The failure pattern involves local crushing of concrete between the threads of the screw. This paper investigates the load bearing behaviour of threaded screws installed in cement mortar under compressive loading. The results supports the application of the technique in the assessment of compressive strength of mortar. The main parameters affecting the pushin behaviour are presented and their effects are discussed. It is planned to extend the test program to concrete in the future.
Funding Details: European Commission Horizon 2020
Type of material: Conference Publication
Keywords: Non-destructive testsConcrete screws
Other versions: http://esrel2017.org/
Language: en
Status of Item: Peer reviewed
Conference Details: European Safety and Reliability Conference ESREL, 2017, June 18-22, Portoroz, Slovenia
Appears in Collections:Civil Engineering Research Collection
TRUSS-ITN Research Collection

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