Ambroziak Andrzej, Haustein Elżbieta, Niedostatkiewicz Maciej
Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 11/12 Gabriela Narutowicza Street, 80-233 Gdańsk, Poland.
Materials (Basel). 2020 Dec 23;14(1):20. doi: 10.3390/ma14010020.
This research aimed to determine the durability and strength of an old concrete built-in arch bridge based on selected mechanical, physical, and chemical properties of the concrete. The bridge was erected in 1925 and is located in Jagodnik (northern Poland). Cylindrical specimens were taken from the side ribs connected to the top plate using a concrete core borehole diamond drill machine. The properties of the old concrete were compared with the present and previous standard requirements and guidelines. The laboratory testing program consisted of the following set of tests: measurements of the depth of carbonated zone and dry density, water absorption tests, determination of concrete compressive strength and frost resistance, determination of modulus of elasticity, measurement of the pH value, determination of water-soluble chloride salt and sulfate ion content, and X-ray diffraction analyses. Large variations in the cylindrical compressive strength (14.9 to 22.0 MPa), modulus of elasticity (17,900 to 26,483 MPa), density (2064 to 2231 kg/m), and water absorption (3.88 to 6.58%) were observed. In addition to the experiments, a brief literature survey relating to old concrete properties was also conducted. This paper can provide scientists, engineers, and designers an experimental basis in the field of old concrete built-in bridge construction.
本研究旨在基于混凝土选定的力学、物理和化学性能，确定一座老旧混凝土内置拱桥的耐久性和强度。该桥建于1925年，位于亚戈德尼克（波兰北部）。使用混凝土取芯金刚石钻孔机从连接顶板的侧肋中取出圆柱形试件。将老旧混凝土的性能与现行和先前的标准要求及指南进行了比较。实验室测试项目包括以下一组测试：碳化层深度和干密度测量、吸水性测试、混凝土抗压强度和抗冻性测定、弹性模量测定、pH值测量、水溶性氯化物盐和硫酸根离子含量测定以及X射线衍射分析。观察到圆柱形抗压强度（14.9至22.0兆帕）、弹性模量（17900至26483兆帕）、密度（2064至2231千克/立方米）和吸水率（3.88至6.58%）存在较大差异。除了实验之外，还对与老旧混凝土性能相关的文献进行了简要调研。本文可为科学家、工程师和设计师在老旧混凝土内置桥梁建设领域提供实验依据。
