Wpływ technologii układania betonu samozagęszczalnego na nośność połączenia beton-beton oraz stal-beton w elementach wykonywanych warstwowo

Dybeł, Piotr

doi:10.32047/CWB.2023.28.4.1

Artykuł - szczegóły

Tytuł artykułu

Wpływ technologii układania betonu samozagęszczalnego na nośność połączenia beton-beton oraz stal-beton w elementach wykonywanych warstwowo

Autorzy

Dybeł Piotr

Wybrane pełne teksty z tego czasopisma

http://www.cementwapnobeton.pl/

Identyfikatory

DOI

10.32047/CWB.2023.28.4.1

Warianty tytułu

Effect of self-compacting concrete placement technology on the load-bearing capacity of the concrete-concrete and steel-concrete bond in layered elements

Języki publikacji

PL EN

Abstrakty

Artykuł przedstawia badania dotyczące technologii warstwowego wykonywania konstrukcji z betonu samozagęszczalnego. Badania przeprowadzono na elementach panelowych o wymiarach 800×480×160 mm, betonowanych w dwóch warstwach z jednego punktu podawania mieszanki. Założono trzy różne czasy opóźnienia podawania drugiej warstwy mieszanki: 15, 30 oraz 60 minut. Przeanalizowano dwa warianty technologiczne podawania mieszanki: od góry i od dołu formy. Analizowano wpływ technologii układania mieszanki na nośność połączenia warstw betonu oraz pręta zbrojeniowego z betonem. Nośność połączenia warstw betonu określono za pomocą badania wytrzymałości na rozciąganie przy rozłupywaniu, na próbkach rdzeniowych pobranych z elementów panelowych. W dotychczasowej literaturze badanie nośności połączenia warstw było badane na znacznie mniejszych elementach i nie uwzględniały one innej technologii podawania mieszanki niż tradycyjna. Badanie przyczepności pręt zbrojeniowy-beton na styku warstw wykonano metodą pull-out. Wykazano duże różnice w sposobie mieszania się warstw betonu, w zależności od zastosowanej technologii jego podawania. Betonowanie od góry formy powodowało spadek nośności zespolenia warstw jak i zmniejszenie sztywności i nośności połączenia pręt zbrojeniowy-beton wraz ze zwiększeniem czasu opóźnienia podawania drugiej warstwy. Z kolei betonowanie od dołu formy zapewniło uzyskanie nośności zespolenia warstw betonu na poziomie 90% wytrzymałości próbki monolitycznej w całym zakresie badań. Technologia betonowania od dołu została polecona do wykonywania elementów w technologii wielowarstwowej z betonu samozagęszczalnego.

The article presents a study on the technology of layered execution in self-compacting concrete structures. The research focused on 800×480×160 mm panel elements, cast in two layers from a single mix casting point. Three different delay times for delivering the second layer of mix were considered: 15, 30 and 60 minutes. Two technological variants of mix application were analysed: from the top and from the bottom of the mould. The study investigated the influence of the placement technology on the load bearing capacity of the concrete layer-to-layer joint and the rebar-to-concrete joint. The load-bearing capacity of the concrete layer-to-layer joint was determined through a splitting tensile strength test on core specimens extracted from panel elements. Notably, existing literature has primarily explored the load-bearing capacity of the concrete layer-to-layer joint on smaller elements and has not accounted for mix placing technologies diverging from the traditional one. A test of the rebar-to-concrete bond at the layer interface was conducted using the pull-out method. Substantial differences were identified in the mixing pattern of concrete layers, contingent on the placing technology employed. Top-down casting led to a reduction in the load-bearing capacity of the concrete layer-to-layer interface, coupled with decreased stiffness and bond strength of the rebar-to-concrete connection as the delay time of the second layer increased. Conversely, bottom-up concreting maintained the load-bearing capacity of the combined concrete layers at 90% of the strength of the monolithic specimen throughout the entire test range. The article recommends the utilization of bottom-up placing technology for executing elements in the multilayer casting of self-compacting concrete.

Słowa kluczowe

beton samozagęszczalny technologia układania połączenie warstw połączenie beton-stal kierunek betonowania betonowanie oddolne

self-compacting concrete bond multilayer casting casting direction bottom-up placing

Wydawca

Fundacja Cement, Wapno, Beton

Czasopismo

Cement Wapno Beton

Rocznik

2023

Tom

R. 28, nr 4

Strony

210--224

Opis fizyczny

Bibliogr. 39 poz., il., tab.

Twórcy

autor

Dybeł Piotr

dybel@agh.edu.pl

AGH University of Krakow

https://orcid.org/0000-0001-7991-1576

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-73812b74-678a-4f1a-8898-baac27024aec