Influence of temperature on the compressive strength of high performance and ultra‐high performance concretes

Deutscher, Melchior; Markert, Martin; Scheerer, Silke

doi:10.1002/suco.202100153

Cited by 6 publications

(9 citation statements)

References 16 publications

(49 reference statements)

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“…It also became clear that the temperature of dried concrete (HPC8-D) rose much less than the temperature of concrete with moisture (HPC8-C and HPC8-UW). Due to the strong heating of the samples, the influence on the static compressive strength must be considered in more detail [ 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Influence of Moisture Content on Fatigue Behaviour of HPC by Using DMA and XRCT

et al. 2021

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High-performance concrete (HPC) is a topic of current research and construction projects, due to its outstanding compressive strength and durability. In particular, its behaviour under high-cycle fatigue loading is the focus of current investigations, to further pave the way to highly challenging long-lasting constructions; e.g., bridges or offshore buildings. In order to investigate the behaviour of HPC with different moisture contents in more detail, a mixture of silica sand and basalt aggregate with a maximum grain size of 8 mm was investigated with three different moisture contents. For this purpose, cyclic compressive fatigue tests at a loading frequency of 10 Hz and different maximum stress levels were performed. The main focus was the moisture influence on the number of cycles to failure and the development of concrete temperature and strain. In a further step, only the mortar matrix was investigated. For this purpose, the mixture was produced without basalt, and the moisture influence was investigated on smaller-sized test specimens using dynamic mechanical analysis (DMA) and X-ray computed tomography (XRCT). It was shown that the moisture content of HPC had a significant influence on the fatigue damage behaviour due to the number of cycles to failure decreasing significantly with increased moisture. In addition, there was also an influence on the temperature development, as well as on the strain development. It was shown that increasing moisture content was associated with an increase in strain development. XRCT scans, in the course of the damage phases, showed an increase in internal cracks, and made their size visible. With the help of DMA as a new research method in the field of concrete research, we were also able to measure damage development related to a decrease in sample stiffness. Both methods, XRCT and DMA, can be listed as nondestructive methods, and thus can complement the known destructive test methods, such as light microscopy.

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Section: Resultsmentioning

confidence: 99%

Investigation of the Influence of Moisture Content on Fatigue Behaviour of HPC by Using DMA and XRCT

et al. 2021

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“…In [22], a substantial study on the effect of temperature T on the compressive strength of the investigated UHPC was presented. Specimen geometry, sample age, and test setup were basically the same.…”

Section: Temperature Effect On Static Compressive Strengthmentioning

confidence: 99%

“…In [13,16,21], the main parameters influencing the material heating were already discussed. Based on the investigation of the influence of specimen temperature on the static compressive strength [22], the change in the applied load level over the course of a cyclic trial was derived; an influence that cannot be neglected and that reaches into the two-digit percentage range. The thesis was that this is the main reason for the sometimes significant drop below the Wöhler curve according to fib Model Code 2010 [10].…”

Section: Summary Conclusion and Outlookmentioning

confidence: 99%

“…In the future, it will therefore be possible to efficiently test high-performance concretes at high test speeds and, subsequently, to mathematically extract the associated influence of heating. The only thing required is about a measurement of the temperature-dependent change in the static compressive strength, which is specified in fib Model Code 2010 [10] up to HPC and which was determined separately for the examined UHPC [22]. Based on the maximum temperature measured at half the specimen height, after failure the test result can be entered in the Wöhler curve diagram with the corrected upper stress level Sc,max,cor(T).…”

Section: Summary Conclusion and Outlookmentioning

confidence: 99%

“…At temperatures of up to 90 °C observed so far under fatigue loading [13,21], heating led to a reduction in the static compressive strength. In [22] this influence on the static compressive strength was shown in addition to the fib Model Code 2010 [10] for the analysed UHPC. It was also evident that the observed effect was particularly strong for specimens stored in a typical laboratory climate chamber (20 °C and 65% RH) until testing.…”

Section: Introductionmentioning

confidence: 99%

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Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results

Deutscher

2021

Applied Mechanics

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Material-efficient, highly load-bearing members made of high-performance compressive concretes are often exposed to cyclical loads because of their slender construction, which can be relevant to the design. When investigating the fatigue behaviour of high-performance concretes in pressure swell tests, however, the specimen temperature rises strongly owing to the elevated loading rate at frequencies higher than 3 Hz. This leads to a negative influence on the achieved number of load cycles compared to tests carried out at slow speeds and calculated values, for example, according to fib Model Code 2010. This phenomenon, which was already observed, must be considered when generating design formulae or Wöhler lines for component design, as the test conditions with high constant load frequencies as well as sample storage in a climate chamber at constant conditions are prerequisites that cannot be expected in real material applications. Therefore, laboratory testing influences must be eliminated in order to avoid underestimating the material. Instead of adjusting the test conditions to prevent or control temperature development, as was the case in previous approaches, this article shows how the temperature effects can be corrected when analysing the results, considering both the applied stress and the maximum temperature reached. For this purpose, a calculation method was developed that was validated on the basis of a large number of fatigue tests. Thus, in the future, the application of one temperature sensor to the test specimen can effectively advance the extraction of values for Wöhler curves, even with high test frequencies.

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Bruchlastwechselzahlen von druckschwellbeanspruchtem Beton unter Berücksichtigung der Streuung der Druckfestigkeit

Voß,

Schmidt,

Oettel

2024

Beton und Stahlbetonbau

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Die aktuellen Nachweisformate für die Bemessung von ermüdungsbeanspruchtem Beton sehen hohe Sicherheiten insbesondere für hohe Betondruckfestigkeiten vor, die eine wirtschaftliche Anwendung dieser Betone und Materialeinsparungen erschweren. Für eine sichere, aber auch wirtschaftliche und nachhaltige Bemessung von ermüdungsbeanspruchten Betonbauwerken wäre eine Weiterentwicklung des Sicherheitskonzepts zweckdienlich, was eine genaue Kenntnis der streuungsverursachenden Parameter voraussetzt. In verschiedenen experimentellen Untersuchungen wurde bereits die Streuung der Betondruckfestigkeit als primärer Einflussparameter auf die Streuung der Bruchlastwechselzahlen identifiziert. In diesem Beitrag werden zunächst aktuelle Nachweise gegen Betonermüdung vorgestellt, Ergebnisse von Druckschwellversuchen an Betonprobekörpern unterschiedlicher Festigkeiten, Geometrien und Versuchsrandbedingungen in einer Datenbank zusammengefasst und die Streuung der experimentell ermittelten Bruchlastwechselzahlen statistisch ausgewertet. In einem weiteren Schritt werden die Spannungsniveaus der Ermüdungsversuche mit einem stochastischen Ansatz angepasst, sodass die Streuung der Betondruckfestigkeit inklusive der Nacherhärtung Berücksichtigung findet. Es wird gezeigt, dass sich durch den Ansatz der Betondruckfestigkeitsstreuung in Anlehnung an DIN EN 1992‐1‐1 und DIN EN 12390‐3 eine deutliche Reduzierung des Streubands der Bruchlastwechselzahlen im Wöhlerdiagramm erreichen lässt.

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Influence of temperature on the compressive strength of high performance and ultra‐high performance concretes

Cited by 6 publications

References 16 publications

Investigation of the Influence of Moisture Content on Fatigue Behaviour of HPC by Using DMA and XRCT

Investigation of the Influence of Moisture Content on Fatigue Behaviour of HPC by Using DMA and XRCT

Consideration of the Heating of High-Performance Concretes during Cyclic Tests in the Evaluation of Results

Bruchlastwechselzahlen von druckschwellbeanspruchtem Beton unter Berücksichtigung der Streuung der Druckfestigkeit

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