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    Experimental and numerical evaluation of a stackable compressed earth block masonry system: Characterization at cyclic shear loads
    (Elsevier Ltd, 2022-11-15)
    Soil is a traditional construction material that is currently experiencing a new boom as an eco-sustainable alternative for housing. In this article, a structural system made up of compressed earth blocks is analyzed as a construction alternative for seismic countries. This study evaluated the physical properties of base soil as well as an optimization process for the chemical stabilization of the mixture using cement and lime. The mechanical characterization of the blocks and of a masonry system designed to be stackable and dry joint was also performed, including the evaluation of its seismic response to cyclic shear wall tests. Results indicate that it is possible to improve the workability of the stabilized soil mixtures and the mechanical behavior of blocks in compression and tension, by using cement-lime additives in a ratio of 1:3 with respect to the dry weight of the materials. In addition, it was found that it is feasible to produce a stackable masonry system that has the capacity to dissipate energy due to friction between blocks. The parametric analysis and the calibration process of numerical models performed for the cyclic shear tests highlight the importance of using a micro-modeling approach to obtain representative models that correctly predict the experimental capacity curve in both maximum load and ductility. The use of those models in the present study allowed to adequately replicate the concentration of damage in the joints between blocks, corroborating what was observed through experimental testing.
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    Rapid and cost-effective fabrication of microfluidic chips with resin 3D printing
    (Springer Science+Business Media, 2026-01-01)
    The fabrication of microfluidic chips has traditionally relied on photolithographic techniques. Although highly precise, these methods require specialized cleanroom facilities and involve multiple complex steps. In recent years, additive manufacturing—particularly resin-based 3D printing—has emerged as a promising alternative, offering more accessible, cost-effective, and rapid prototyping. In this study, we present a protocol for fabricating high-resolution microfluidic templates using an LCD-based resin 3D printer, followed by replication of microchannels in polydimethylsiloxane (PDMS). Our results show that while LCD 3D printing enables fast prototyping, it has limitations in accurately reproducing fine features (especially channel widths below 100 μm) due to overexpansion of cured resin. Morphological and dimensional analyses by scanning electron microscopy (SEM) revealed discrepancies between the designed and actual channel dimensions, primarily attributed to the printer’s pixel size constraints and light diffusion during polymerization. Despite these challenges, the ability to reuse a printed template for multiple PDMS replications significantly enhances fabrication scalability and cost efficiency. This study underscores the potential of resin-based 3D printing for microfluidic applications and provides optimization strategies to improve dimensional accuracy in future development.
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