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Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times
Experimental investigations on 12 push-off specimens with dimensions of 600 × 300 × 180 mm (200 × 180 mm shear plane) were presented. Models reflected the connection between ordinary concrete (NWC) substrate and lightweight aggregate concrete (LWAC) overlay. The main purpose of the study was to inve...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8036439/ https://www.ncbi.nlm.nih.gov/pubmed/33800692 http://dx.doi.org/10.3390/ma14071664 |
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author | Gołdyn, Michał Urban, Tadeusz |
author_facet | Gołdyn, Michał Urban, Tadeusz |
author_sort | Gołdyn, Michał |
collection | PubMed |
description | Experimental investigations on 12 push-off specimens with dimensions of 600 × 300 × 180 mm (200 × 180 mm shear plane) were presented. Models reflected the connection between ordinary concrete (NWC) substrate and lightweight aggregate concrete (LWAC) overlay. The main purpose of the study was to investigate behaviour of the interface between concretes cast at different times. Two different interface conditions were considered: Smooth and rough (obtained by graining). In the selected elements, additional reinforcement consisting of one ∅8 bar was injected. The elements were tested under load control. The failure of the specimens without interface reinforcement was violent and resulted from breaking of the adhesive bond. Specimens with shear reinforcement failed in a ductile manner, however, due to the low reinforcement area, the residual load capacity was much lower than the load recorded just before cracking. It was found that mechanical roughening of the surface can lead to degradation of the concrete structure. As a result, the load-carrying capacities of elements with smooth interface proved to be higher than the ultimate loads of elements with deliberately roughened contacts. Comparative analysis showed that the existing design procedures ACI 318-19, Eurocode 2, Model Code 2010, and AASHTO can lead to safe but conservative estimation of the actual resistance of the concrete interface. |
format | Online Article Text |
id | pubmed-8036439 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-80364392021-04-12 Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times Gołdyn, Michał Urban, Tadeusz Materials (Basel) Article Experimental investigations on 12 push-off specimens with dimensions of 600 × 300 × 180 mm (200 × 180 mm shear plane) were presented. Models reflected the connection between ordinary concrete (NWC) substrate and lightweight aggregate concrete (LWAC) overlay. The main purpose of the study was to investigate behaviour of the interface between concretes cast at different times. Two different interface conditions were considered: Smooth and rough (obtained by graining). In the selected elements, additional reinforcement consisting of one ∅8 bar was injected. The elements were tested under load control. The failure of the specimens without interface reinforcement was violent and resulted from breaking of the adhesive bond. Specimens with shear reinforcement failed in a ductile manner, however, due to the low reinforcement area, the residual load capacity was much lower than the load recorded just before cracking. It was found that mechanical roughening of the surface can lead to degradation of the concrete structure. As a result, the load-carrying capacities of elements with smooth interface proved to be higher than the ultimate loads of elements with deliberately roughened contacts. Comparative analysis showed that the existing design procedures ACI 318-19, Eurocode 2, Model Code 2010, and AASHTO can lead to safe but conservative estimation of the actual resistance of the concrete interface. MDPI 2021-03-28 /pmc/articles/PMC8036439/ /pubmed/33800692 http://dx.doi.org/10.3390/ma14071664 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ). |
spellingShingle | Article Gołdyn, Michał Urban, Tadeusz Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times |
title | Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times |
title_full | Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times |
title_fullStr | Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times |
title_full_unstemmed | Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times |
title_short | Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times |
title_sort | experimental investigations on interface between ordinary and lightweight aggregate concretes cast at different times |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8036439/ https://www.ncbi.nlm.nih.gov/pubmed/33800692 http://dx.doi.org/10.3390/ma14071664 |
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