Case Studies in Construction Materials

An extensive data-set framework including various parameters, which alters the structural performance of CNT-reinforced cement-based composites is constructed for Machine learning models training purposes. Here, numerous mechanical attributes were collected via experimental tests conducted in previous literature. The properties which influence the mechanical behavior of NCT-reinforced materials were Cement type, Water-to-cement ratio (WC), Content of carbon nanotubes, External Diameter, Length, Functionalization method, Curing days, Curing temperature, and Dispersion method. References G. Y. Li, P. M. Wang, X. Zhao, Mechanical behavior and microstructure of cement composites incorporating surface-treated multi-walled carbon nanotubes, Carbon 43 (6) (2005) 1239–1245. X. Cui, B. Han, Q. Zheng, X. Yu, S. Dong, L. Zhang, J. Ou, Mechanical properties and reinforcing mechanisms ofcementitious composites with different types of multiwalled carbon nanotubes, Composites Part A: Applied Scienceand Manufacturing 103 (2017) 131–147. S. Xu, J. Liu, Q. Li, Mechanical properties and microstructure of multi-walled carbon nanotube-reinforced cementpaste, Construction and Building Materials 76 (2015) 16–23. B. Wang, Y. Han, B. Pan, T. Zhang, Mechanical and morphological properties of highly dispersed carbon nanotubesreinforced cement based materials, Journal of Wuhan University of Technology-Mater. Sci. Ed. 28 (1) (2013) 82–87. G. Y. Li, P. M. Wang, X. Zhao, Pressure-sensitive properties and microstructure of carbon nanotube reinforced cementcomposites, Cement and Concrete Composites 29 (5) (2007) 377–382. M. O. Mohsen, R. Taha, A. Abu Taqa, N. Al-Nuaimi, R. A. Al-Rub, K. A. Bani-Hani, Effect of nanotube geometryon the strength and dispersion of cnt-cement composites, Journal of Nanomaterials 2017 (2017). M. del Carmen Camacho, O. Galao, F. J. Baeza, E. Zornoza, P. Garc ́es, Mechanical properties and durability of cntcement composites, Materials 7 (3) (2014) 1640–1651. F. T. Isfahani, W. Li, E. Redaelli, Dispersion of multi-walled carbon nanotubes and its effects on the properties ofcement composites, Cement and Concrete Composites 74 (2016) 154–163. M. O. Mohsen, R. Taha, A. A. Taqa, A. Shaat, Optimum carbon nanotubes’ content for improving flexural andcompressive strength of cement paste, Construction and Building Materials 150 (2017) 395–403.

A composite cement-asbestos samples were placed in a corundum crucible and heated for 1 hour in an electric furnace. After the heating process the samples were subjected to microstructural investigations using scanning electron microscopy. These tests were carried out using a JEOL JSM-6610LV microscope after covering the samples earlier with a conductive layer of gold. X-ray examinations were also carried out to identify the asbestos form and evaluate the phase changes caused by the thermal treatment. XRD tests were carried out using the powder method on a Philips X'Pert Pro diffractometer. The measurement step was 0.008° and count time -50 s. Phase identification was performed based on data from the ICDD PDF-4 database. In the case of the selected samples, spectroscopic tests in the mid-infrared range - 4000 - 400 cm-1 (MIR) were also carried out. These tests were performed using a Bruker 70V spectrometer. Spectroscopic samples were prepared in the form of KBr pellets. The measurements were made by the transmission technique, and spectra were recorded on the scale of absorbance at 256 scans and 4 cm-1 resolution. The chemical composition of the samples was determined using an Axios Max WD-XRF X-ray fluorescence spectrometer with wavelength dispersion using a 4kW Rh lamp.

Open dataset for publication Sikora P., Techman M., Federowicz K., El-Khayatt A.M., Saudi H.A., Abd Elrahman M., Hoffmann M., Stephan D., Chung S.-Y. Insight into the microstructural and durability characteristics of 3D printed concrete: Cast versus printed specimens. Case Studies in Construction Materials (2022), 17, e01320. https://doi.org/10.1016/j.cscm.2022.e01320 File 1 - Mechanical characteristics - *.opju (Origin) File 2 - Particle size distributions of used materials - *.opju (Origin) File 3 - Sorptivity measurement data - *.opju (Origin) File 4 - G-code for printing of 1 layered specimen - *txt File 5 - G-code for printing of 3 layered specimens - *txt

An understanding of the potential for fibres to corrode in aggressive environments is essential to the long-term design of fibre reinforced concretes. Given a significant number of individual tests that have been conducted using a range of different specimen types (variations in specimen dimension and material properties) and accelerating conditions (variation in corrosion technique and exposure time), existing tests are summarized to provide an overview of the field and to help inform future experimental design. This dataset consists of 342 individual tests from 20 existing research studies. The parameters in the database include concrete strength, fiber geometry, fiber pre-damage (with/without pre-corrosion), the technique used to accelerate corrosion, corrosion measurement techniques, and number of specimens for any specific scenario.