Lewiński Paweł M, Fedorczyk Zbigniew, Więch Przemysław, Zacharski Łukasz
Building Research Institute (ITB), Filtrowa 1, 00-611 Warsaw, Poland.
Materials (Basel). 2025 Jun 23;18(13):2977. doi: 10.3390/ma18132977.
The aim of this work is to determine the short-term and long-term mechanical properties of lightweight concrete with relatively new sintered aggregate, as knowledge of these parameters is essential to the design of prestressed structures. The problem can be placed in a broader ecological context, because the aggregate comes from recycled power plant ash. This research study was planned based on two concrete mixtures that were already used in previous publications, as the aim of this work was to conduct comparative research by using other methods. In particular, the aim was to investigate the long-term properties of lightweight concrete by using standard methods and appropriate equipment, such as creep-testing machines. As a result of these studies, the secant modulus of elasticity, cylindrical strength, cubic strength, axial tensile strength, splitting tensile strength, bending strength, and shrinkage and creep strain were determined. This study confirmed the short-term properties of concrete obtained in previous studies but did not confirm the results regarding shrinkage and creep. These results turned out to be much higher, which means that these values should not be tested by non-standard methods. An unusual process of development of the elastic modulus and axial tensile strength was observed, and the reasons for these phenomena were described.
这项工作的目的是确定使用相对新型烧结骨料的轻质混凝土的短期和长期力学性能，因为了解这些参数对于预应力结构的设计至关重要。该问题可以置于更广泛的生态背景下，因为这种骨料来自回收的电厂灰烬。本研究基于先前出版物中已使用的两种混凝土混合物进行规划，因为这项工作的目的是通过使用其他方法进行对比研究。具体而言，目的是通过使用标准方法和适当设备（如蠕变试验机）来研究轻质混凝土的长期性能。这些研究的结果包括确定了割线弹性模量、圆柱体强度、立方体强度、轴向抗拉强度、劈裂抗拉强度、抗弯强度以及收缩和徐变应变。本研究证实了先前研究中获得的混凝土短期性能，但未证实关于收缩和徐变的结果。这些结果要高得多，这意味着这些值不应通过非标准方法进行测试。观察到了弹性模量和轴向抗拉强度不同寻常的发展过程，并描述了这些现象的原因。
