Consequently, there are numerous approaches proposed in the literature to minimize cracking in reinforced concrete structures.Ĭoncrete is a quasi-brittle material that cracks at low strain levels.
Pcmscan crack cracked#
However, they may create durability issues: both chloride ingress and carbonation have been shown to advance much faster in cracked concrete, thereby leading to rapid steel depassivation and corrosion. Most of these cracks do not pose a threat for the structural integrity of a structure. Reinforced concrete structures are, however, always cracked, due to a variety of reasons: mechanical loads, (restrained) shrinkage, thermal deformations, and freezing and thawing, among others. These guidelines are, however, derived assuming that the concrete cover is uncracked. As a consequence, service life design guidelines require that the concrete cover to the reinforcement is of a certain dimension and quality. Since steel corrosion is an expansive reaction, it will then lead to cracking and spalling of the concrete cover. Reinforcement corrosion can be caused by concrete carbonation which leads to a drop in the pH value (below 9) and breaks down the passivation layer or chloride ingress which can locally break down the passive layer leading to pitting corrosion. Under certain conditions, however, this passive film can break down, leading to reinforcement corrosion.
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When steel is embedded in concrete in order to take over tensile stresses, it is typically protected from corrosion by a passive film formed on its surface due to the high alkalinity of the concrete pore solution. Concrete is a highly durable building material and can have a long service life with little or no maintenance. Reinforced concrete is a building material of choice for structures in challenging environments. This overview aims to assure the researchers and asset owners of the potential of this maturing technology and bring it one step closer to practical application. Finally, a summary and the possible research directions for future work are given. This is followed by a discussion of modelling techniques for PCM-concrete composites and their performance. Further, the influences of PCMs on concrete properties (fresh, hardened, durability) are discussed in detail. Then, possible uses of PCMs in concrete technology are discussed. First, types of PCMs and ways of incorporation in concrete are discussed. This paper presents a comprehensive overview of the literature devoted to using PCMs to control temperature related cracking in concrete. Nevertheless, they can also influence concrete properties. Through their ability to capture heat, PCMs can offset temperature changes and reduce gradients in concrete structures. In recent years, a new approach has been proposed for controlling temperature related cracking-utilization of phase change materials (PCMs) in concrete. Therefore, numerous research studies have been devoted to reducing concrete cracking.
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Cracks in concrete structures present a threat to their durability.