Průša David, Šťastník Stanislav, Šuhajda Karel, Svobodová Kateřina, Žajdlík Tomáš, Hobzová Klára, Novotný Miloslav
Institute of Building Structures, Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 602 00 Brno, Czech Republic.
Gels. 2023 Nov 10;9(11):889. doi: 10.3390/gels9110889.
The present paper deals with the properties of hardened cement mixtures that have been exposed to microwave radiation. Microwaves fall under electromagnetic waves (EMW), and the main reason for using EMW radiation is to accelerate the drying of concrete as well as to reduce the time required to obtain the handling strength after it is removed from the mould. This paper is divided into two main parts. In the first part, three sets of cement samples were made. One set of samples solidified naturally in air and the second and third sets of samples were exposed to EMW radiation, with different exposure times for each. The solidification was then stopped, and the representation of the major minerals was experimentally determined. The second part of the experiment focuses on the properties of the hardened cement mixtures, both in terms of strength and physical properties. The experiment was carried out on two sets of samples. Each mixture was exposed to EMW radiation, the main differences being the exposure time and the position of the samples relative to the EMW generator. The aim of the experiments is to determine the resulting mechanical properties of the samples in comparison with those that were subjected to normal solidification in air. The data from these experiments suggest that microwave radiation can be used to accelerate the curing of concrete specimens, obtaining the handling strength in a relatively short time, but a reduction in the resulting strength can be expected compared to the reference specimens.
本文探讨了暴露于微波辐射下的硬化水泥混合物的性能。微波属于电磁波（EMW），使用电磁波辐射的主要原因是加速混凝土干燥，并减少从模具中取出后达到可处理强度所需的时间。本文分为两个主要部分。在第一部分中，制作了三组水泥样品。一组样品在空气中自然固化，第二组和第三组样品暴露于电磁波辐射下，每组的暴露时间不同。然后停止固化，并通过实验确定主要矿物的表现形式。实验的第二部分着重于硬化水泥混合物在强度和物理性能方面的特性。实验在两组样品上进行。每组混合物都暴露于电磁波辐射下，主要区别在于暴露时间以及样品相对于电磁波发生器的位置。实验目的是将样品的最终力学性能与在空气中正常固化的样品进行比较。这些实验数据表明，微波辐射可用于加速混凝土试件的养护，在相对较短的时间内获得可处理强度，但与参考试件相比，预计最终强度会有所降低。
