Influence of concrete humidity on the temperature development under fatigue compressive loading

Markert, Martin; Birtel, Veit; Garrecht, Harald

doi:10.1088/1757-899x/615/1/012099

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…It is clear from Figure 2 a that the number of cycles to failure decreases with an increasing moisture content in the concrete. This corresponds well to the results of the very limited number of investigations previously documented in the literature [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] and further ongoing research [ 25 , 26 ].…”

Section: Resultssupporting

confidence: 90%

Influence of Moisture Content and Wet Environment on the Fatigue Behaviour of High-Strength Concrete

et al. 2022

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The influence of a wet environment on the fatigue behaviour of high-strength concrete has become more important in recent years with the expansion of offshore wind energy systems. According to the few investigations documented in the literature, the fatigue resistance of specimens submerged in water is significantly lower compared to that of specimens in dry conditions. However, it is still not clear how the wet environment and the moisture content in concrete influence its fatigue behaviour and which damage mechanisms are involved in the deterioration process. Here the results of a joint project are reported, in which the impact of moisture content in concrete on fatigue deterioration are investigated experimentally and numerically. Aside from the number of cycles to failure, the development of stiffness and acoustic emission (AE) hits are analysed as damage inductors and discussed along with results of microstructural investigations to provide insights into the degradation mechanisms. Subsequently, an efficient numeric modelling approach to water-induced fatigue damage is presented. The results of the fatigue tests show an accelerated degradation behaviour with increasing moisture content of the concrete. Further, it was found that the AE hits of specimens submerged in water occur exclusively close to the minimum stress level in contrast to specimens subjected to dry conditions, which means that additional damage mechanisms are acting with increasing moisture content in the concrete.

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Section: Resultssupporting

confidence: 90%

Influence of Moisture Content and Wet Environment on the Fatigue Behaviour of High-Strength Concrete

et al. 2022

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“…2). A microphone at the other end of the specimen perceived the vibrations so that the sound velocity could be determined [33,34]. The measurement was performed 2 Measuring procedure for the determination of sound velocity with the Lang RA 100 [35] by means of the non-destructive testing equipment ''RA 100 Concrete'' by Lang Sensorik (ASTM C215, BS 1881-209).…”

Section: Complementary Investigationsmentioning

confidence: 99%

Influence of the specimen production and preparation on the compressive strength and the fatigue resistance of HPC and UHPC

2021

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The results of tests under monotonically increasing load and cyclic compression load are often analysed by means of probabilistic methods. Although there is a considerable scattering in the results, especially in the number of cycles to failure, the cause of these cannot be completely explained. The imperfections of the specimens tested are among the causes of this scattering mentioned in the literature. Based on a round robin test the influence of HPC and UHPC production and specimen preparation techniques on the mean values of the compressive strengths, number of cycles to failure and data scattering have been evaluated. The main findings of the study are that the production techniques have an influence on the compressive strength, however, do not affect the mean number of cycles to failure. Moreover, the accurate preparation of the specimens has a positive influence on the compressive strength and the scattering of the results of both compression and cyclic load tests. The mean number of cycles to failure of HPC specimens is not influenced by the preparation techniques, whereas the polishing technique may have a positive influence on the mean number of cycles to failure of UHPC specimens.

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“…The tested samples have a height of 180 mm and a diameter of 60 mm and thus correspond to Refs. [3,7,18]. All HPC samples were produced, stored and tested at MPA Stuttgart, the UHPC research was conducted at TU Dresden.…”

Section: Used Materials Specimen Geometry and Storage Conditionsmentioning

confidence: 99%

“…For HPC, these 90 days were also used in order to create the same boundary conditions, even though, according to Ref. [18] strength development is largely completed after 56 days. Basic information about the two concretes can be taken from Table 2.…”

Section: Specimen and Test Set‐upmentioning

confidence: 99%

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

Deutscher

Markert

Scheerer

2021

Structural Concrete

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The heating up of high-performance concretes under fatigue load in cyclic pressure threshold test raises the question of the mechanisms and influences of this heat development. Of particular interest is how the heating affects the fatigue strength and what the causes of this are. In order to be able to answer this basically, two test series-one with an HPC and one with a UHPC-were carried out in which the temperature influence on the static compressive strength in a range of À25 C to 90 C was determined. In addition, different storage conditions are being considered in order to question previous findings. In this article, the state of the art is briefly presented and the test program based on it. Then, the production and storage of the specimen, their preparation and the used measurement technique are explained. The results obtained are presented with regard to concrete strength, type of storage, moisture content and, in the main part, the influence of temperature. A discussion of the results in relation to the state of knowledge follows. General insights are acquired, which will be very helpful for further work in the field of fatigue research on high performance concretes.

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Influence of concrete humidity on the temperature development under fatigue compressive loading

Cited by 5 publications

References 2 publications

Influence of Moisture Content and Wet Environment on the Fatigue Behaviour of High-Strength Concrete

Influence of Moisture Content and Wet Environment on the Fatigue Behaviour of High-Strength Concrete

Influence of the specimen production and preparation on the compressive strength and the fatigue resistance of HPC and UHPC

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

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