Shrinkage and Expansion Strains in Self-compacting Concrete: Comparison of Methods of Measurements

Zdanowicz, Katarzyna; Marx, Steffen

doi:10.1007/978-3-319-59471-2_63

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…Weitere Einflussfaktoren sind die Art des Zements, der w / z ‐Wert, der Elastizitätsmodul der Gesteinskörnung und die Betonbestandteile im Allgemeinen [15] sowie die Umgebungsbedingungen. Die seit 2015 an der Leibniz Universität Hannover durchgeführten Untersuchungen zeigen zudem einen sichtbaren Einfluss von eventuell vorhandenen Fließmitteln (in selbstverdichtenden Betonen) [16].…”

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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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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“…Prestressing of such reinforcement can enhance the structural performance of concrete members considerably. [20][21][22] However, it is extremely challenging to prestress textile FRP reinforcement using the conventional mechanical prestressing. Because such reinforcement is very sensitive to the transverse force resulting from the mechanical anchorage.…”

Section: Introductionmentioning

confidence: 99%

“…The reinforcement is known as textile carbon fiber reinforced polymer (CFRP) reinforcement, and it consists of a flexible two‐dimensional grid made of CFRP fibers. Prestressing of such reinforcement can enhance the structural performance of concrete members considerably 20–22 . However, it is extremely challenging to prestress textile FRP reinforcement using the conventional mechanical prestressing.…”

Section: Introductionmentioning

confidence: 99%

Chemical prestressing of concrete structures; state of the art review

Dhahir,

Marx,

Zdanowicz

2023

Structural Concrete

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Chemical prestressing was developed during the 1960s; however, and due to technical difficulties at that time, the technology was not considered as an alternative to conventional prestressing; instead, it was only used as a shrinkage compensating method. Still, recent development in concrete technology encouraged several researchers to revisit this technology, where significant achievements were made. This paper aims to present a state‐of‐the‐art review about the recent development in the chemical prestressing technology. This includes reviewing existing field applications, existing types of expansive additives, influence of different expansive additives, influence of curing methods, mix proportioning, mechanical properties, and structural behavior. Furthermore, a thorough discussion was performed and suggestions were made for future researchers to help further contribute to the development of this prestressing technology. It was concluded that although the chemical prestressing technology seems very promising, more research is required before using it in practical applications.

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“…Although the corrugated tube test is not applicable for concrete, because of the presence of aggregates, this was not a problem in this study due to the relatively small aggregate size used. The advantages of using fiber In the literature, different tests are described to measure (autogenous) shrinkage in mortar or concrete: The restrained ring test according to the American Society of Testing and Materials ASTM C 1581-04 [17], the corrugated tube test according to ASTM C 1698-09 [18], the use of embedded sensors [19][20][21], the use of demountable mechanical strain gauge (DEMEC) measurements [22,23]. The corrugated tube combines the advantages of linear and volumetric methods while avoiding most of the disadvantages in other methods like loss of moisture, longitudinal restraints, difficulty to start the measurements before hardening, practical difficulties in handling the specimens.…”

Section: Introductionmentioning

confidence: 99%

The Use of Superabsorbent Polymers in High Performance Concrete to Mitigate Autogenous Shrinkage in a Large-Scale Demonstrator

et al. 2020

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High performance concrete (HPC) is a high strength concrete that undergoes a lot of early-age autogenous shrinkage (AS). If shrinkage is restrained, then micro-cracks arise and threaten the durability of the structure. Superabsorbent polymers (SAPs) can reduce/mitigate the autogenous shrinkage, due to their promising application as internal curing agents. In this paper, large-scale demonstrators were built to investigate the efficiency of SAPs to mitigate autogenous shrinkage in HPC. For this purpose, different measurement techniques were used like embedded fiber optic sensors and demountable mechanical strain gauges, complemented by AS measurements in corrugated tubes and restrained ring tests. The SAP wall showed an AS reduction of 22%, 54%, and 60% at the bottom, middle, and top, respectively, as recorded by the sensors (in comparison with the reference wall (REF)). In the corrugated tubes, mitigation of AS was shown in the SAP mixture, and under restrained conditions, in the ring test, the reference mixture cracked after two days, while the SAP mixture had not cracked at the end of the measurement period (20 days). Cracks were shown on REF wall after one day, while the SAP wall was crack-free. Water flow tests performed on the main crack of the REF wall confirmed that the flow rate is related to the third power of the crack width. All tests showed that SAPs could highly reduce AS in HPC and avoid cracking.

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Shrinkage and Expansion Strains in Self-compacting Concrete: Comparison of Methods of Measurements

Cited by 7 publications

References 2 publications

Biege‐ und Verbundverhalten von chemisch vorgespannten textilbewehrten Betonelementen

Biege‐ und Verbundverhalten von chemisch vorgespannten textilbewehrten Betonelementen

Chemical prestressing of concrete structures; state of the art review

The Use of Superabsorbent Polymers in High Performance Concrete to Mitigate Autogenous Shrinkage in a Large-Scale Demonstrator

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