Programa del congreso

Abstract– This research aimed to optimize the mechanical behavior of concrete made with non-standardized aggregates by partially replacing the fine aggregate with copper slag in proportions of 0.5%, 1%, and 1.5%, and to evaluate the combined effect of this substitution with the addition of 40 g of copper fiber. The study was experimental, with a quantitative approach and a quasi-experimental design. A total of 63 cylindrical specimens measuring 4” × 8” were prepared and tested after 7, 14, and 28 days of curing, according to Peruvian standards NTP 339.033 and NTP 339.034. The results showed that the incorporation of copper slag positively influences the compressive strength of the concrete, especially at low proportions. At 28 days, the control sample reached an average compressive strength of 286.20 kg/cm², while the mixture with 0.5% copper slag achieved 280.91 kg/cm² and the mixture with 1.5% slag reached 290.43 kg/cm². Furthermore, the combination of 0.5% copper slag with 40 g of copper fiber exhibited the best overall performance, achieving an average compressive strength of 293.68 kg/cm² at 28 days, surpassing the control concrete and easily meeting the minimum strength required by Peruvian Technical Standard E.060 (f’c = 210 kg/cm²). In conclusion, the partial substitution of fine aggregate with copper slag, especially in low proportions and in combination with copper fiber, improves the compressive strength of concrete made with non-standardized aggregates. Furthermore, this alternative contributes to the utilization of industrial waste, reducing environmental impact and production costs, making it a technical, economic and sustainable solution for the construction industry.

The use of built-in smartphone sensors has emerged as a low-cost alternative for experimental physics teaching. However, quantitative evidence simultaneously validating the accuracy of these sensors and their impact on university academic performance is scarce. This study experimentally evaluated the reliability of atmospheric pressure and gravitational acceleration sensors using the "Sensors Toolbox" app, comparing measurements with theoretical models. Additionally, a quasi-experimental design was implemented with 40 Physics I students, divided into control and experimental groups. Results showed relative errors below 2% in physical measurements and a significant improvement (p < 0.05, d = 1.05) in academic performance of the experimental group. It is concluded that smartphones constitute reliable and pedagogically effective portable laboratories for university physics teaching, especially in resource-limited contexts.

This article presents a systematic review of gamified learning systems applied to students with Attention Deficit Hyperactivity Disorder (ADHD) within the framework of neurodiversity. Twelve empirical studies, including randomized controlled trials and quasi-experimental designs, were analyzed to evaluate their impact on sustained attention, academic performance, and motivational processes. The findings indicate significant improvements in time-on-task, self-regulation, and engagement when game mechanics are strategically aligned with psychological principles. Immediate feedback, structured progression, and adaptive personalization emerged as key design components associated with positive cognitive outcomes. However, excessive stimulation and poorly calibrated reward systems may increase extraneous cognitive load and compromise meaningful learning. The evidence suggests that gamification effectiveness is contingent upon theoretical coherence and pedagogical intentionality rather than mere entertainment elements. The study proposes a neurocompatible gamification model integrating motivational theory and cognitive load regulation. Overall, gamified systems represent a promising evidence-based strategy to enhance inclusive education for neurodiverse learners

The main objective of this study was to determine the heavy metal (Pb, Zn, Cd) remediation capacity in synthetic aqueous solutions using thermally transformed eggshell residues, and to establish a rigorous technical comparison between the analytical methodologies used for monitoring: complexometric titration (EDTA) and instrumental spectrometry (AAS). For this purpose, poultry biomaterial was collected and processed, undergoing a calcination process at 900°C to obtain activated Calcium Oxide (CaO). A batch factorial experimental design was applied, evaluating critical variables: pH (6.5, 7.5, 8.5), adsorbent dosage (2.0, 4.0, 6.0 g/L), and contact time (30, 90, 150 min). The quantification of residual metal ions was performed using a dual strategy differentiated by concentration and toxicity levels.Through statistical characterization and data analysis, removal schemes and adsorption kinetics were developed, allowing for the identification of maximum efficiencies of 88.1% for Pb, 84.07% for Cd, and 79.2% for Zn under alkaline conditions (pH 8.5), driven by synergistic mechanisms of chemical precipitation and electrostatic attraction on the biosorbent surface. Finally, based on the characteristics observed during the experimental phase and analytical validation, it was concluded that while Atomic Absorption Spectroscopy (AAS) is indispensable for detecting Cadmium traces due to its high sensitivity and selectivity regarding the calcic matrix, Complexometric Titration with EDTA remains a robust and economically viable alternative for controlling processes with high Zinc and Lead loads, provided that interferences are strictly managed through chemical masking protocols.

Heavy metal contamination in agricultural products represents a critical environmental and public health concern worldwide. Lead (Pb) poses severe risks due to its bioaccumulative nature and toxic effects even at low concentrations. In regions near mining activities, such as Junín (Peru), Solanum tuberosum the world’s third most important food crop becomes a potential pathway for Pb exposure in human diets. Conventional analytical techniques (AAS, ICP-MS) provide high precision but require costly infrastructure, specialized personnel, and are unsuitable for decentralized field monitoring. This study presents the design and construction of a portable electrochemical system based on a gold (Au) working electrode for Pb detection in Solanum tuberosum. The device employs a three-electrode configuration (Au working electrode, Ag/AgCl reference, graphite counter-electrode) coupled with Differential Pulse Anodic Stripping Voltammetry (DPASV). Sample preparation involved alkaline digestion with NaOH, and calibration was carried out using Pb standard solutions. Validation was performed by comparison with Atomic Absorption Spectroscopy (AAS). The results demonstrate the feasibility of an accessible, sensitive, and low-cost sensor capable of detecting Pb in potato samples with reproducibility comparable to conventional laboratory methods. The system successfully integrated electrochemical, electronic, and computational components into a functional prototype, ensuring stable data acquisition and visualization. This approach highlights the potential of portable electrochemical platforms to strengthen food safety monitoring and environmental surveillance in vulnerable agricultural communities.

This study evaluated the compressive strength of a rigid wearing course using concrete colored with natural pigments. Three pigments were used: cochineal (red), broom flower (yellow), and blue stalk (blue), incorporated in defined proportions into the concrete. The main objective was to determine the effect of these pigments on mechanical strength, comparing the results with a standard mixture without colorants. Preliminary tests were conducted to characterize the materials and define the optimal dosage. The specimens were molded, cured, and labeled, following technical standards. Compressive strength was evaluated by breaking the specimens after 28 days. In addition, color uniformity and stability, as well as surface durability, were analyzed; these are relevant aspects for wearing courses exposed to traffic. The results obtained will allow for recommending optimal dosages and evaluating the influence of each pigment on the structural and functional performance of colored concrete, promoting ecological and sustainable alternatives for road infrastructure.