Abstract
The curing of concrete significantly influences the hydration process and its strength development. Inadequate curing leads to a loss of quality and has a negative effect on the durability of the concrete. Usually, the effects are not noticed until years later, when the first damage to the structure occurs because of the poor concrete quality. This paper presents a non-destructive measurement method for the determination of the curing quality of young concrete. Hyperspectral imaging in the near infrared is a contactless method that provides information about material properties in an electromagnetic wavelength range that cannot be seen with the human eye. Laboratory tests were carried out with samples with three different curing types at the age of 1, 7, and 27 days. The results showed that differences in the near infrared spectral signatures can be determined depending on the age of the concrete and the type of curing. The data was classified and analyzed by evaluating the results using k-means clustering. This method showed a high level of reliability for the differentiation between the different curing types and concrete ages. A recommendation for hyperspectral measurement and the evaluation of the curing quality of concrete could be made.
Highlights
The curing of concrete is largely responsible for the quality of concrete components.To achieve durability, concrete must be treated and protected
The biggest differences could the two classes, A and B, decreased, which means that the spectral signatures of class A
Conclusions andB,Outlook two classes, A and decreased, which means that the spectral signatures of class A and
Summary
The curing of concrete is largely responsible for the quality of concrete components.To achieve durability, concrete must be treated and protected. The hardening process and compaction of concrete starts immediately after its pouring, e.g., in its formwork. During this phase, the chemical hydration generates the cement stone, which ties together the grains of the composite material concrete [1]. The chemical hydration generates the cement stone, which ties together the grains of the composite material concrete [1] At this stage it is of the utmost importance for a proper hydration to have enough moisture available to develop the desired concrete strength. An insufficient moisture range on the concrete surface causes a drying process associated with the development of capillary pores, and in consequence, to an imperfect hydration and reduced strength [2,3]. The structure in the peripheral concrete zone remains porous, which leads to lower surface strength, reduced weather resistance, lower resistance to chemical attack, the development of early shrinkage cracks, etc. [4,5,6]
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