Abstract
This dataset represents an addendum and contains relevant data on the development and testing of a mineral-based composite duct for the placement of unbonded tendons in functionally graded concrete components. The composite duct possesses a tube profile, was produced in a pultrusion process and constists of basalt reinforcing fibers, embedded in a matrix of chemically bonded phosphate ceramics (CBPC).The dataset is structured in the following topics:dimensions/To examine the manufacturing quality, the following geometric dimensions of the individual test specimens were taken using a caliper gauge (precision 0.01 mm) and compared with a target value: Inner diameter and wall thickness at the two end points as well as outer diameter in the middle and end area. Based on those values, the respective cross-section was derived. For better comparability, the measured values are illustrated in a spider diagram. To account and check for manufacturing consistency, the test specimens were picked from different areas of the pultrusion process - namely Start, Mid and End.experimental_results/The experimental results from uniaxial tensile tests (DIN EN ISO 527-4 and -5) and three-point-bending tests (DIN EN ISO 14125) allow an assessment of the material behavior during loading and up to fracture. The test setups and relevant geometric dimensions of the test specimens are provided in the enclosed figures. Each test series consisted of six specimens. This enabled a statistical evaluation based on mean values, standard deviations and coeffients of variation (COV). The dataset comprises information on the distance [mm] and force [N] measured by the testing machine (Zwick Type 1474) as well as the calculated stresses [N/mm²] and strains [%].The associated pictures and scanning electron microscope (SEM) images of fractured specimens facilitate a detailed analysis of the failure modes.material_properties/To further examine the manufacturing quality of the pultruded composite duct the dataset comprises: 1) SEM images with annotations of specimens from the three pultrusion areas (Start, Mid and End) prior to loading, and 2) pictures after a casting test with a highly flowable concrete to account for the impermeability of the duct.To analyze the processability and curing behavior of the CBPC matrix, rheological investigations were performed with a plate-plate rheometer (Physica MCR 401). The collected data includes the shear rate [1/s] and stress [Pa], as well as the time [min], temperature [°C] and viscosity [Pa*s] for the test samples RS1 and RS2.production_setup/In addition to the metrological studies, the experimental tests and the investigations into manufacturing quality and processability, the dataset also contains relevant information on the design of the pultrusion line and the modifications to the impregnation setup based on schematic illustrations.
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