Preview

Author(s):
Title:
Abstract:	Vier Straßenbetone wurden mit der am F.A. Finger-Institut für Baustoffkunde der Bauhaus-Universität Weimar entwickelten FIB-Klimawechsellagerung einer AKR-provozierenden Lagerung unterzogen. Es wurden Dehnungen, Druckfestigkeit, Elastizitätsmodul, Kriechen und Schwinden bestimmt. Die Ergebnisse zeigen, dass der AKR-bedingte Schädigungsprozess wie folgt beschrieben werden kann: AKR-verursachte Mikrorissbildung in der Zementmatrix ist für die Druckfestigkeit des Betons eher nebensächlich. Löseprozesse und Rissbildungen in der Gesteinskörnung setzen die Steifigkeit des Betons (E-Modul) herab, nicht jedoch die Druckfestigkeit. Die Risse, die bei langsam reagierenden Gesteinskörnungen ihren Ursprung im Gesteinskorn haben, setzen sich in die Matrix fort. Bei größerem Matrixvolumen und vermehrter Rissbildung wird das Kriechen vergrößert. Ungeschädigter Beton zeigt, wenn auch nur marginal, unter Einfluss einer Natriumchloridlösung (NaCl-Lösung) ein erhöhtes Kriechen, was auf einen chemischen Einfluss der Matrix hinweist. Creep and mechanical properties of pavement concretes after ASR-provocative storage Four pavement concretes were subjected to ASR-provoking storage with the FIB climate simulation concrete prism test which has been developed on F.A. Finger-Institute for Building Materials Science of Bauhaus University Weimar. Strains, compressive strength, elastic modulus, creep and shrinkage have been determined. The results show, that the ASR-induced damage process can be described as follows: ASR-induced micro-cracking in the cement matrix is rather negligible for compressive strength of concrete. Dissolution processes and cracking in the aggregate reduce the stiffness of the concrete (modulus of elasticity), but not the compressive strength of concrete. The cracks that originate in the rock grain of slow-reacting aggregates continue into the matrix. With a larger matrix volume and thus increased crack formation, creep is increased. Undamaged concrete shows marginally larger creep under the influence of salt solution (NaCl solution). This indicates a chemical influence of the matrix.
Source:	Beton- und Stahlbetonbau 114 (2019), No. 6
Page/s:	419-429
Language of Publication:	German

I would like to buy the article

You can download this article for 25 € as a PDF file (1.42 MB).
The PDF file can be read, printed and saved.
Duplication and forwarding to third parties is not allowed.

Please enter your email address now to start the order process.
The link for the download will be sent to the email address stated after the
order process has been completed.

Your email address

I am an online subscriber

As an online subscriber of the journal "Beton- und Stahlbetonbau" you can access this article via Wiley Online Library.

I would like to order "Beton- und Stahlbetonbau"

This article has been published in the journal "Beton- und Stahlbetonbau". If you would like to learn more about the journal, you can order a free sample copy or find out more information on our website.

Prices include VAT and postage. Prices for 2017/2018.
€ Prices apply to Germany only. Subject to alterations, errors excepted.