Conference Agenda

Abstract- In situations where water resources are scarce, the optimization of internal curing in concrete has drawn more attention as a sustainable substitute for traditional external water curing. In order to assess the efficacy of polyethylene glycol (PEG-400) as an internal curing agent and identify the ideal dosage, this study presents a systematic review of the scientific literature published between 2017 and 2025. Using Scopus, Web of Science, ScienceDirect, and Google Scholar as the main databases, the review was carried out in accordance with the PRISMA methodology. Based on concrete grade, PEG-400 dosage, curing age, and mechanical performance, a total of 24 experimental investigations that satisfied the inclusion criteria were examined. The findings show that for M20, M30, and M40 concretes, a dose of 1% by weight of cement is the most frequently recorded and offers the highest overall performance in terms of compressive strength, reaching compressive strengths of up to 57.8 N/mm² at 28 days. Higher dosages (1.5%–2%) may provide localized increases in tensile and flexural strength, but they may have a detrimental impact on workability and may not always improve compressive strength. All things considered, a 1% PEG-400 dosage is found to be the ideal worldwide ratio for efficient internal curing, guaranteeing ongoing hydration, enhanced mechanical performance, and decreased dependence on external curing water.

This study evaluates the flexural behavior of concrete beams reinforced with Guadua angustifolia bamboo and grade 60 corrugated steel, using three-point bending tests performed according to ASTM standards and the E.060 regulation. After 28 days of curing, the bamboo-reinforced beams reached an average flexural strength of 9.59 MPa, a flexural modulus of 614.43 MPa, and a maximum deflection of 5 mm, while the steel-reinforced beams reached 10.06 MPa, 643.69 MPa, and 5 mm, respectively. ANOVA analysis showed significant differences between the two reinforcements at 7 days (p < 0.001) and 14 days (p = 0.008), but not significant differences at 28 days (p = 0.105). Although steel showed less dispersion (SD = 0.23 MPa) compared to bamboo (SD = 0.63 MPa), the results indicate that bamboo can be considered a viable alternative structural reinforcement, provided that aspects of adhesion and variability are controlled.

The challenges related to the durability and mechanical performance of rigid pavements in the city of Arequipa require innovative and sustainable solutions. Therefore, this experimental and quantitative study aims to determine the optimal mixture among four proposed dosages that improves compressive strength. The methodology involved the design of a reference concrete mix using the ACI 211.1 method to achieve a target compressive strength of 280 kg/cm², along with the prior characterization of fine and coarse aggregates. Based on the reference mix, three modified dosages were prepared: 1.5% FbA, 5% CCA + 1.5% FbA, and 10% CCA + 1.5% FbA. A total of 16 cylindrical specimens (100 mm × 200 mm), four per dosage, were molded and cured for 28 days before conducting compressive strength tests. The results showed that the aggregate properties complied with the requirements of the ACI 211.1 method. Moreover, the mixture containing 1.5% FbA and 5% CCA exhibited the highest average compressive strength, reaching 300.325 kg/cm², which represents an increase of 7.31% compared to the reference mix. Consequently, it is concluded that the ACI 211.1 method is suitable for pavement concrete design, and that the incorporation of 1.5% FbA and 5% CCA constitutes a viable alternative for enhancing the durability and compressive performance of rigid pavements in the city of Arequipa.

The objective of this research was to analyze the architectural semiotics of the Chimú Hotel and its relationship with collective memory for its re-signification as the articulating axis of the Chimbote boardwalk, Peru 2025. The study adopted a qualitative approach, of a basic type and descriptive level, with a phenomenological and cross-sectional design, oriented towards the symbolic understanding of architectural space. Observation, interview, and documentary analysis techniques were applied, using as instruments the architectural observation form, the semi-structured interview guide, and the historical-documentary file, validated by expert judgment and verified through methodological and source triangulation. The results showed that most participants associate the Chimú Hotel with Chimbote’s urban identity and collective memory, highlighting its modern heritage value and its potential to reactivate citizens’ sense of belonging. In conclusion, architectural semiotics made it possible to understand that the recovery of the building not only revitalizes its urban function but also strengthens cultural identity and the emotional bond of the community with its coastal environment.

The study examines the urban liminality of Sector 7 in Chimbote, where unplanned urban expansion has generated liminal spaces that alter pedestrians’ sensory perception, causing disorientation and insecurity. The general objective was to analyze the liminality of pedestrian environments through the sensory perception of the urban landscape, aiming to identify levels of liminality, their relationship with spatial configuration, and their influence on pedestrian comfort. The methodology was basic, qualitative, descriptive, non-experimental, and cross-sectional. Direct observation, semi-structured interviews, and surveys were conducted using observation forms, interview guides, and five-point Likert scale questionnaires. Validity was established through expert judgment and Aiken’s V (1.0), and reliability through Cronbach’s Alpha (0.907). The sample consisted of 90 intentionally selected pedestrians. The results showed a medium level of liminality: spatial discontinuity, lack of hierarchy, and environmental degradation in Sector 7 generate negative perceptions of the environment, with 47% of respondents reporting excessive noise and visual disconnection, while 48% reported thermal discomfort. It is concluded that these conditions reinforce urban liminality, revealing a fragmented, uninviting, and sensorially incoherent space.

Slope stability in tailings dams represents a critical challenge in the mining industry due to the potential impacts of failure. This research evaluates the effectiveness of the soil-cement technique with the addition of Duraflex for slope stabilization in dams constructed with borrow material. Geotechnical parameters were determined for representative tailings mixtures (fine sand and clay in 50/50 and 75/25 ratios), treated with 10 % Type I Portland cement by soil weight and the addition of Duraflex at 2 % by cement weight. Grain size analysis, Standard Proctor, direct shear, and unconfined compressive strength tests were conducted at 7 and 28 days. Stability analyses were performed on a realistic dam section using the limit equilibrium methodology (Spencer's method) under static and pseudo-static conditions. Results showed that the natural soil presented a static Factor of Safety (FoS) of 1.48, while soil-cement improvement increased FoS values above 2.00. The addition of Duraflex improved initial strength, particularly at 7 days. A brittle behavior was observed in the cemented mixtures; however, pseudo-static FoS values exceeded 3.00, confirming the technical effectiveness of the proposal.