In the era of the Fourth Industrial Revolution, artificial intelligence (AI) is a core technology, and AI-based applications are expanding in various fields. This research explored the influencing factors on end-user’s intentions and acceptance of AI-based technology in construction companies using the technology acceptance model (TAM) and technology–organisation–environment (TOE) framework. The analysis of end-users’ intentions for accepting AI-based technology was verified by applying the structure equation model. According to the research results, the technological factors along with external variables and an individual’s personality had a positive influence (+) on the perceived usefulness and the perceived ease of use of end-users of AI-based technology. Conversely, environmental factors such as suggestions from others appeared to be disruptive to users’ technology acceptance. In order to effectively utilise AI-based technology, organisational factors such as the support, culture, and participation of the company as a whole were indicated as important factors for AI-based technology implementation.

Additive manufacturing enables innovative structural design for industrial applications, which allows the fabrication of lattice structures with enhanced mechanical properties, including a high strength-to-relative-density ratio. However, to commercialize lattice structures, it is necessary to define the designability of lattice geometries and characterize the associated mechanical responses, including the compressive strength. The objective of this study was to provide an optimized design process for lattice structures and develop a lattice structure characterization database that can be used to differentiate unit cell topologies and guide the unit cell selection for compression-dominated structures. Linear static finite element analysis (FEA), nonlinear FEA, and experimental tests were performed on 11 types of unit cell-based lattice structures with dimensions of 20 mm × 20 mm × 20 mm. Consequently, under the same relative density conditions, simple cubic, octahedron, truncated cube, and truncated octahedron-based lattice structures with a 3 × 3 × 3 array pattern showed the best axial compressive strength properties. Correlations among the unit cell types, lattice structure topologies, relative densities, unit cell array patterns, and mechanical properties were identified, indicating their influence in describing and predicting the behaviors of lattice structures.

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This investigation studied the strength and performance of cementitious materials, such as concrete and mortar, with multi-walled carbon nanotubes (MWNTs). One hundred cylindrical specimens 10 cm in diameter and 20 cm in height were used to investigate strength variation and changes in the durability of concrete and mortar as a function of the weight percent (0,1 . 5 wt%) of MWNTs and the effectiveness of a dispersion method that used a sodium naphthalene sulfonate formaldehyde solution. Industrial-grade MWNTs (purity: >90%, diameter: >50 nm) were used for the test. Ball milling with 1 . 5 wt% MWNT was processed for 7 h, followed by a dilution process with 0 . 25, 0 . 5, 0 . 75, 1 . 0, 1 . 25 and 1 . 5 wt% dispersive solutions. Ultrasonication treatments were then applied to each diluted solution for 20 min. Compressive strength, splitting tensile strength, permeability, electrical conductivity and the relative dynamic modulus of the concrete cylinders were tested under a 24 MPa mix design by increasing the wt% MWNT using standard ASTM guidelines. In parallel, MWNT mortar tests were performed for compressive strength, flexural bending and shrinkage with 50 prismatic specimens (4 3 4 3 16 cm in size).

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