Pokorný Jaroslav, Ševčík Radek, Šál Jiří, Zárybnická Lucie, Žák Jaroslav
Department of Civil Engineering, Faculty of Technology, Institute of Technology and Business, Okružní 517/10, 370 01 České Budějovice, Czech Republic.
Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 809/76, 190 00 Praha, Czech Republic.
Materials (Basel). 2021 Oct 8;14(19):5902. doi: 10.3390/ma14195902.
Most of the historical and old building stock in Europe are constructed from masonry, when brick, stones, or their combination are bound with traditional mortars. Rising damp, due to accompanying effects, is the main factor influencing the quality of indoor climate as well as having an important impact on the durability of masonry structures. In this study, new types of lightweight concrete with waste aggregate content as a suitable material for remediation of damp damaged masonries were designed and tested. Alternative aggregate served as silica sand substitution in the range of 0-100 vol.%. Basic structural properties, mechanical resistance, water, and water vapor transport properties were measured after 28 days of water curing and were compared with dense reference concrete and with traditional masonry materials as well. Moreover, the porous structure of produced concretes and changes caused by usage of alternative aggregate usage were evaluated with the mercury intrusion porosimetry (MIP) technique. Obtained experimental data showed the suitability of modified concretes with 25-50 vol.% of waste aggregate content to ensure acceptable strength and hydric properties, and these properties were found to be comparable with masonry structures and materials used in the past.
欧洲大部分历史建筑和旧建筑存量都是用砖石建造的，砖、石或它们的组合用传统灰浆粘结在一起。由于伴随的影响，上升潮气是影响室内气候质量的主要因素，同时对砖石结构的耐久性也有重要影响。在本研究中，设计并测试了新型轻质混凝土，其含有废骨料，作为修复受潮损坏砖石的合适材料。替代骨料在0-100体积%范围内用作硅砂替代品。在水养护28天后测量了基本结构性能、力学抗性、水和水蒸气传输性能，并与密实参考混凝土以及传统砖石材料进行了比较。此外，用压汞法（MIP）技术评估了所制备混凝土的多孔结构以及因使用替代骨料而引起的变化。获得的实验数据表明，废骨料含量为25-50体积%的改性混凝土适合确保可接受的强度和含水性能，并且发现这些性能与过去使用的砖石结构和材料相当。
