Use of post-installed screws in the compressive strength assessment of in-situ concrete

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Title: Use of post-installed screws in the compressive strength assessment of in-situ concrete
Authors: Sourav, Shah Nur AlamAl-Sabah, SalamMcNally, Ciaran
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Date: 1-Jan-2019
Online since: 2019-08-21T09:15:59Z
Abstract: In the structural evaluation of existing concrete structures, concrete strength is an important parameter that influences the quality of the overall assessment. Non-destructive tests (NDTs) allows the inspection of larger areas of concrete at lesser cost and time than coring and provides more reliable information than visual inspection. The low reliability of common NDTs in the assessment of compressive strength of concrete limits the use of NDTs in the practical field. A new technique, post-installed screw pullout (PSP) test, based on the modified pullout of post-installed screw, is presented in this paper. The screw transfers the load to the concrete through bearing on the threads. During the complete pullout failure mode, the failure pattern involves local crushing of concrete under the threads. The PSP test was investigated in mortar and concrete to study different factors; compressive strength, presence of aggregates, and the types of aggregate. Mortar was considered to be a homogenous material and thus taken as a baseline for comparing the effect of aggregate type. Experimental studies showed that aggregates play a significant role in the assessment of compressive strength by PSP test, and a better correlation with compressive strength was observed when concretes with different aggregates were analysed separately. In the strength assessment, the degree of variability of the PSP test in terms of R-squared value, standard deviation, coefficient of variation, and RMSE for mortar and concrete with brick chips and lightweight aggregates was found to be low; however concrete with limestone aggregate showed higher variability in the test results. The study confirms that the PSP test is a viable test method with the potential to be reliable and reasonably accurate, yet cost effective; it can also contribute to the reduction of the uncertainty in the assessment of compressive strength of in-situ concrete.
Funding Details: European Commission Horizon 2020
Type of material: Conference Publication
Publisher: Taylor & Francis
Start page: 1923
End page: 1930
Copyright (published version): 2019 Taylor & Francis
Keywords: Concrete structuresNon-destructive tests (NDTs)Post-installed screw pullout (PSP)
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Language: en
Status of Item: Not peer reviewed
Is part of: Caspeele, R., Taerwe, L., Frangopol, D.M. (eds.). Life Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision: Proceedings of the Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE 2018), 28-31 October 2018, Ghent, Belgium
Conference Details: IALCCE2018, Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE2018), Ghent, Belgium, 28-31 October 2018
ISBN: 9781138626331
Appears in Collections:Civil Engineering Research Collection

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