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Abstract

In the latest period hundreds of concrete viaducts were built in Poland within a short time range. The cases of destruction of concrete road viaducts described by the author in the article concern in the construction of such structures in various parts of our country, such as central regions of Poland, Warmia-Masuria, south – east - a total of about 30 objects. The occurring phenomenon is related to the micro cracks of the cement matrix which are not visible on the surface of the elements and become visible only after the cyclic freezing process as a result of the standard F150 frost resistance test, the so-called the standard method according to Annex N to the PN-B-06265: 2018 standard. The destruction took an unprecedented course and aroused much discussion in the scientific community. This article summarizes this discussion and indicates the root cause of the destruction.

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Authors and Affiliations

Józef Jasiczak
ORCID: ORCID
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Abstract

Article presents the results of the effect of humidity on early shrinkage of normal concrete with variable W/C ratio. As known for a long time, shrinkage is dependent of many factors. One of them is the W/C ratio and the quantity of water which is located in the concrete mix. In article there were discussed changes taking place in the concrete mix, the methods of research and the partial results obtained by the authors of the paper. Shrinkage is a phenomenon well known and studied by various research centers. The total amount of shrinkage may depend on various factors such as humidity, temperature, composition of the concrete mix, the W/C ratio, the size of the item. The study was conducted to determine the amount of shrinkage in its early stages. It is very important for concrete floors contractors, precast manufacturers to start at the right time finishing work and prevent the formation of shrinkage cracks.

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Authors and Affiliations

Józef Jasiczak
Paweł Szymański
Piotr Nowotarski
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Abstract

The article presents selected types of phase change materials (PCM) and their properties in terms of applications in construction and concrete technology. The purpose of using PCM is to allow the technological barrier to be exceeded in hot and dry climate conditions, enabling the construction of non-cracking concrete structures. Methodology of the multi-criteria decision-making process with the use of a relatively newdecision-making tool in construction – the Analytical Hierarchical Process (AHP) is presented. Theoretical aspects of the method and an example of its practical use for the selection of the best material variant and concrete care method in the dry Syrian climate are presented. The conclusions resulting from the presented article concern two areas, i.e. the advisability of using phase change materials for temperature regulation in the maturing fresh concrete in dry climate conditions and the attractiveness of the AHP method justifying the advisability of choosing the maintenance methods in such conditions.
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Authors and Affiliations

Mahmoud Hsino
1
ORCID: ORCID
Józef Jasiczak
2
ORCID: ORCID

  1. State University of Stanislaw Staszica in Pila, Department of Civil Engineering, 64-920 Pila, Podchorazych 10, Poland
  2. Poznan University of Technology, Institute of Building Engineering, Piotrowo 5, 60-965 Poznan
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Abstract

Modern construction standards, both from the ACI, EN, ISO, as well as EC group, introduced numerous statistical procedures for the interpretation of concrete compressive strength results obtained on an ongoing basis (in the course of structure implementation), the values of which are subject to various impacts, e.g., arising from climatic conditions, manufacturing variability and component property variability, which are also described by specific random variables. Such an approach is a consequence of introducing the method of limit states in the calculations of building structures, which takes into account a set of various factors influencing structural safety. The term “concrete family” was also introduced, however, the principle of distributing the result or, even more so, the statistically significant size of results within a family was not specified. Deficiencies in the procedures were partially supplemented by the authors of the article, who published papers in the field of distributing results of strength test time series using the Pearson, ��-Student, and Mann–Whitney U tests. However, the publications of the authors define neither the size of obtained subset and their distribution nor the probability of their occurrence. This study fills this gap by showing the size of a statistically determined concrete family, with a defined distribution of the probability of its isolation.
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Bibliography

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[6] J. Jasiczak, “Probabilistic Criteria for the Control of Compressive Strength Stabiilization in Concrete”, Foundations of Civil and Environmental Engineering, 2011, no. 14, pp. 47–61.
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Authors and Affiliations

Józef Jasiczak
1
ORCID: ORCID
Marcin Kanoniczak
1
ORCID: ORCID
Łukasz Smaga
2
ORCID: ORCID

  1. Poznan University of Technology, Faculty of Civil and Transport Engineering, Piotrowo 5, 60-965 Poznan, Poland
  2. Adam Mickiewicz University, Faculty of Mathematics and Computer Science, 61-614 Poznan, Poland

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