Chemically Prestressed Concrete

Aroni, Samuel; Bertero,; Polivka, Milos

doi:10.15554/pcij.10011968.22.35

Cited by 11 publications

(15 citation statements)

References 4 publications

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“…The technology of chemical prestressing, proposed and developed between the 1940s and 1960s for steel‐reinforced concrete, is based on the use of expansive admixture provided in the concrete mixture in a proper amount 5,6 . In order to achieve prestressing, and not free expansion, restraint in form of, for example, internal reinforcement is required.…”

Section: Chemical Prestressing With Expansive Concretementioning

confidence: 99%

Distributed strain measurements in thin expansive concrete slabs with biaxial textile reinforcement

Zdanowicz

Beckmann

Marx

2022

Civil Engineering Design

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The objective of the paper is to analyze the shrinkage and expansion strain development in thin slabs made of expansive concrete and reinforced with carbon textile reinforcement. The symmetrical textile reinforcement grid provided a biaxial restraint for the concrete shrinkage and expansion. Strains of the slabs were measured with distributed fiber optic sensors (DFOS) in both directions so that a 2D visualization of their distribution can be presented and analyzed. Parallel, standard restrained expansion tests (RET) were conducted to assess the expansive concrete mixture and large‐scale beam specimens with uniaxial steel reinforcement were also equipped with DFOS and analyzed. This study aimed to compare the strains in uniaxially restrained elements with steel reinforcement and biaxially restrained textile reinforced concrete elements, in order to assess to what extent the results of the standard RET can be used for evaluation of textile reinforced concrete members.

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Section: Chemical Prestressing With Expansive Concretementioning

confidence: 99%

Distributed strain measurements in thin expansive concrete slabs with biaxial textile reinforcement

Zdanowicz

Beckmann

Marx

2022

Civil Engineering Design

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“…As is known [5][6][7][8], self-stress of concrete on NC, which occurs when its free expansion is limited, does not obey the laws of elastic bodies. Determination of the magnitude of selfstress, which ensures the waterproofing properties of a bridge deck made of concrete on stress cement, the study of the process of its occurrence, the identification of those factors on which its value depends, is necessary for a correct understanding of the physics of the self-stress process.…”

Section: The Purpose Of the Construction Of A Concrete Layer On The Stress Cement Of The Bridge Deckmentioning

confidence: 99%

Determination of deformations and self-stress in concrete on stress cement

et al. 2021

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The article considers using a single-layer reinforced ten-centimeter layer of concrete on stress cement instead of the traditional multilayer construction of waterproofing bridges. The proposed design will ensure the water tightness of the bridge deck due to the self-stress in the concrete on the stressing cement, the value of which is proportional to the deformations of concrete and reinforcement. Concrete deformations are uneven over the layer height, and the resulting stress in concrete depends on the reinforcement coefficient. Experiments were carried out to determine the deformations of concrete and the magnitude of self-stress, which provides the waterproofing properties of a bridge deck made of concrete on stress cement. The study of the self-tension process, identifying those factors on which its value depends, is necessary for a correct understanding of the physics of the self-tension process. In addition, it is necessary to check the applicability of various proposed empirical dependences for concrete on stress cement of the composition under consideration.

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“…dieses Vorspannverfahren identifiziert, da es für übliche Betonstahlbewehrung keine großen Vorteile liefert [6][7][8][9]. Bei der chemischen Vorspannung werden die Spannungen ohne mechanische Vorrichtungen allein durch kontrollierte Ausdehnung des Betons in die Bewehrung eingeleitet [10].…”

Section: Aufsatz Articleunclassified

“…Das Konzept der chemischen Vorspannung wurde in den 1940er Jahren in Frankreich erstmalig angewendet und in den 1960er Jahren in Japan weiterentwickelt. Dabei wurde jedoch kein bestimmtes Anwendungsgebiet für dieses Vorspannverfahren identifiziert, da es für übliche Betonstahlbewehrung keine großen Vorteile liefert [6–9]. Bei der chemischen Vorspannung werden die Spannungen ohne mechanische Vorrichtungen allein durch kontrollierte Ausdehnung des Betons in die Bewehrung eingeleitet [10].…”

Section: Prinzip Der Chemischen Vorspannungunclassified

Biege‐ und Verbundverhalten von chemisch vorgespannten textilbewehrten Betonelementen

Zdanowicz

Schmidt

Hansén

et al. 2020

Beton und Stahlbetonbau

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Die chemische Vorspannung ist ein alternatives Verfahren zur Spannungseinleitung in Beton, das ohne mechanische Spannvorrichtungen auskommt. In diesem Beitrag werden die Ergebnisse von experimentellen Untersuchungen zum Trag-und Verformungsverhalten von dünnen textilbewehrten Quellbetonelementen vorgestellt. Hierzu wurden Verformungsmessungen zum freien und behinderten Quellen an Probekörpern unterschiedlicher Quellbetonmischungen sowie experimentelle Untersuchungen zum Biege-und Verbundverhalten von dünnen, mit Carbontextilgittern bewehrten Probekörpern durchgeführt. Die Versuchsergebnisse bestätigen, dass die Verwendung von Quellzusatzmitteln das Verhalten des Textilbetons beeinflusst. Die Beanspruchung bei Erstrissbildung sowie die Durchbiegung bei Erstrissbildung können mit zunehmendem Anteil von Quellzusatzmitteln erhöht werden. Zudem erreichen die Probekörper aus Quellbeton höhere maximale Verbundspannungen als entsprechende Probekörper ohne Quellzusatzmittel.

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Chemically Prestressed Concrete

Cited by 11 publications

References 4 publications

Distributed strain measurements in thin expansive concrete slabs with biaxial textile reinforcement

Distributed strain measurements in thin expansive concrete slabs with biaxial textile reinforcement

Determination of deformations and self-stress in concrete on stress cement

Biege‐ und Verbundverhalten von chemisch vorgespannten textilbewehrten Betonelementen

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