Programa del congreso

This study evaluates the feasibility of using reclaimed asphalt pavement (RAP) as a partial replacement of coarse aggregate in concrete for rigid pavements, designed with a characteristic compressive strength of f’c = 210 kg/cm². Concrete mixtures incorporating RAP at replacement levels of 5%, 10%, and 15% were produced and compared with a conventional control mixture. Prior to mixing, natural aggregates and RAP were characterized through particle size distribution, moisture content, specific gravity, absorption, Los Angeles abrasion, and unit weight tests. The workability of fresh concrete was evaluated using the slump test.

In the hardened state, compressive strength tests were performed on cylindrical specimens, while flexural strength (modulus of rupture) was determined using concrete beam specimens. The results indicated that the mixture containing 5% RAP exhibited the best mechanical performance, showing an approximate increase of 29% in compressive strength and 4% in flexural strength compared to the control mixture. In contrast, mixtures with 10% and 15% RAP showed a decreasing trend in mechanical properties.

The findings demonstrate that the controlled use of RAP as a partial replacement of coarse aggregate is technically viable and contributes to environmental sustainability by reducing asphalt waste and the demand for natural aggregates. It is concluded that an optimal RAP content of 5% is suitable for application in concrete for rigid pavements, provided that proper material characterization and quality control are ensured.

This research evaluates the effect of eucalyptus ash as a partial replacement for cement in hydraulic concrete designed for pavement applications with a characteristic compressive strength of f’c = 210 kg/cm². Concrete mixtures were prepared with eucalyptus ash replacement levels of 0%, 5%, 15%, and 20% by weight of cement. The mixtures were evaluated through compressive strength and flexural strength tests at curing ages of 7, 14, and 28 days.

The results at 28 days showed that the control mixture achieved an average compressive strength of 254.84 kg/cm² and a flexural strength of 42.41 kg/cm². In contrast, the mixtures incorporating eucalyptus ash exhibited a progressive reduction in both mechanical properties as the replacement percentage increased, reaching minimum values of 164.30 kg/cm² in compression and 32.93 kg/cm² in flexure for the mixture with 20% ash content.

Despite the observed reduction in mechanical strength, the results indicate that eucalyptus ash can be considered a sustainable alternative material for non-structural concrete applications, contributing to waste valorization and the reduction of Portland cement consumption.

This research analyses the effect of the Soil Nano Stabilisation 360 additive on the bearing capacity of cohesive soils in the subgrade of the Pucará – Pampa Grande section of the road in Chota, Cajamarca. An experimental methodology was used, extracting samples from seven test pits dug along the road section. Three test pits were randomly selected, containing silty and clayey soils, and treated with two dosages of the additive: 0.025% NLF + 0.5% NPF and 0.045% NLF + 1.5% NPF, to evaluate their bearing capacity. Laboratory tests (Modified Proctor and CBR) showed that the application of SNS 360 increased the maximum dry density by 1.46% to 1.951 g/cm³ and reduced the optimum moisture content by 8.77% to 12.27%, improving soil compaction. Furthermore, the bearing capacity increased between 2.5 and 6.34 times in the CBR test, reaching values ​​of 31.40% and 37.40% for the first and second applications, respectively. The results confirm that the additive improves soil properties, with the dosage of 0.045% NLF + 1.5% NPF being the most effective, and its use is recommended in road and foundation projects on low-strength cohesive soils

Informal construction is a persistent phenomenon worldwide, particularly in Latin America, where it is estimated that between 30% and 70% of urban buildings are constructed without technical supervision. In contexts of rapid urban growth and economic inequality, low-income populations access housing through self-construction, without complying with technical standards or structural safety regulations. This research evaluated the mechanical properties of informal concrete used in homes in the Huacariz, Mollepampa, and Nuevo Cajamarca sectors of the city of Cajamarca. Compressive, flexural, and tensile strength were analyzed and compared with the minimum values ​​required by the NTP, ACI, and RNE technical standards. The methodology adopted a quantitative, descriptive, non-experimental, and cross-sectional approach, applying standardized laboratory tests to 450 specimens extracted in situ from 30 homes. The results showed that informal concrete does not meet the minimum strength requirements, registering negative differences of up to 41.28% in compression (the minimum standard value is 210.00 kg/cm²), 52.92% in flexure (the minimum standard value is 38.00 kg/cm²), and 39.31% in tension (the minimum standard value is 19.82 kg/cm²). While the Nuevo Cajamarca sector showed better results than the other sectors, they still fall below the standards established in the regulations. This demonstrates that the informal concrete used in the evaluated homes does not meet the minimum structural strength requirements, posing a significant risk to the safety of their occupants

This study determined the influence of curing methods on the compressive strength of piles constructed with industrial and artisanal clay bricks in the city of Cajamarca, both without curing and with different curing methods. The piles were constructed using King Kong 18H SIPÁN industrial bricks and artisanal bricks from the El Cerrillo community. For this study, 25 piles of each brick type were constructed with 1:4 cement-sand mortar and 1 cm joints. In all cases, the bricks were soaked for 20 minutes before laying. Five piles of each brick type were tested without curing, and five were tested with each curing method (spraying with Sika® Antisol® S, immersion in water, daily spraying, and spraying three times a day). After 28 days of curing, the piles were tested, revealing that the industrial piles showed decreases of 13.17%, 26.21%, and 25.16% compared to the uncured piles. However, the piles sprayed three times a day showed an increase in resistance of 4.85%. The compressive strength of the piles made with handmade bricks showed increases of 12.41%, 35.06%, 14.41%, and 16.73% compared to the uncured but saturated piles before placement. Therefore, it is concluded that curing benefits the strength of brick stacks made with handmade bricks; however, it has a negative influence on most of the curing of stacks made with industrial bricks

The present study evaluates the factor of safety in the cliffs of the Costa Verde, specifically along the Bajada Sucre – Bajada Marbella section in the district of Magdalena del Mar, through the application of the soil nailing technique while varying the location of the bars. In particular, it assesses whether placing bars only in the upper and lower sections of the slope is more effective than installing them along the entire slope. Modeling was performed using Slide software, considering the geotechnical conditions of the ground and the structural properties of the nails. The results show a significant increase in the factor of safety compared to the natural state of the cliff, achieving values that ensure the global stability of the slope. Regarding the comparison with the use of steel soil nails along the entire profile, it was concluded that, since both cases yield similar factors of safety with minimal variation, for the scenario analyzed it is more effective to install nails only in the upper and lower parts of the slope rather than in the center, allowing for economic savings. Furthermore, the importance of selecting the correct nail placement is highlighted, as certain zones have greater relevance than others. It is concluded that the soil nailing system constitutes a technically viable and efficient solution to improve the stability of the Costa Verde cliffs, representing an adequate alternative to other stabilization methods.

Abstract—The study addresses the lack of updated data on the uniaxial compressive strength (UCS) of granite–granodiorite rocks of the Coastal Batholith geographically emplaced in the surroundings of the city of Trujillo, information necessary for geotechnical design and stability evaluation in engineering projects. The research is applied and experimental. Sampling points
were delimited within quadrangles 17-e and 17-f of the National Geological Map, from which five zones were selected and representative samples were extracted. These were prepared as standardized specimens and tested at the Rock Mechanics Laboratory of Universidad Privada del Norte, recording their parameters and determining their UCS. The results show a strength range between 61.72 and 171.23 MPa, evidencing variability among samples due to differences in texture, composition, and degree of weathering. The classification placed two samples in medium strength, two in moderately high strength, and one in high strength. The study concludes that the obtained values provide data on the UCS range of the Coastal Batholith rocks around Trujillo and confirm the mechanical heterogeneity of their lithologies, which is fundamental for geotechnical and mining applications in the region.