Conference Agenda

Structural reinforcement encompasses many challenges. If a structural element is damaged by some external factor and is not reinforced, failure can be immediate. The research presents a method of repairing and reinforcing structures by applying carbon fiber, to determine the increase in resistance to shear force. As elements that do not have twist at the node are required to evaluate their shear resistance, six reinforced concrete frames were made, incorporating three steel fibers. After the shear test and reaching their ultimate failure, they were repaired with SikaRep 500 and reinforced with carbon fiber; For the shear test, the load was applied at a distance equal to the effective superelevation. It is concluded that the average resistance in beams with simple reinforcement without the addition of steel fiber, when repaired and reinforced with carbon fiber, was 8.56 MPa, in the initial stage it was 3.91 MPa and in the beams with fiber addition of steel was 9.19 MPa and in the initial stage it was 5.18 MPa. The average deformation in beams with simple reinforcement without the addition of steel fiber, when repaired and reinforced with carbon fiber, was 6.62 mm and in the initial stage it was 2.40 mm, while, in the beams with fiber addition of steel was 9.26 mm and in the initial stage it was 3.00 mm. Demonstrating that the use of carbon fiber as reinforcement increases the initial shear resistance by up to 2.19 times.

The county of Vázquez de Coronado in the province of San José, Costa Rica, is made up of five districts, Patalillo, San Isidro, San Rafael, Dulce Nombre de Jesús and Cascajal, where there is great economic activity in each of its districts. In several areas, the activities that are most dominant are farming and tourism, which are carried out mostly in the upper part of the districts of Dulce Nombre de Jesús and Cascajal, being in the latter where the street called Platanares is located. The street does not currently allow transit because of the damaged state it is in. However, said route would be an important connection between National Route 216 and National Route 307 allowing greater efficiency to movement of goods. That is why in this research the data obtained from materials, climate and traffic of the area is being processed and analyzed based on an empirical mechanistic pavement design methodology using a linear elastic multilayer software to determine the stresses, deflections and especially unit deformations required by transfer equations in the mechanistic models to calculate fatigue compliance by cracked area, longitudinal cracks, and total deformation and rutting. With the data obtained, a base design was made that was iterated twice, optimizing the design in cost as structural capacity, complying with a specific design for the area analyzed for the analysis time established according to the hierarchical level chosen based on the roads’ characteristics and demonstrating the efficiency of mechanistic empirical methods over current empirical methodologies.

Plastic is one of the main contributors to environmental pollution, which prompted this research aimed at evaluating the influence of adding recycled PET plastic on the density, absorption, and compressive strength of concrete blocks intended for structural use. An experimental design was employed, producing blocks with a control sample and incorporating recycled PET in proportions of 5%, 10%, and 15%. The blocks were subjected to standardized tests according to NTP 399.602, 2017, including compressive strength, dry density, and maximum absorption. The results showed compressive strengths of 15.51, 13.57, and 12.57 MPa, absorption values of 73, 80, and 84 kg/m³, and densities of 2074, 2050, and 1989 kg/m³, respectively, for the different PET proportions. It is concluded that adding 5% recycled PET plastic meets the minimum requirements established by the standard, positioning it as a sustainable alternative for manufacturing concrete blocks.

The present study, conducted in Trujillo, Perú, addresses issues related to the workability of concrete, a key factor influencing pathologies such as honeycombing. The main objective was to evaluate the impact of adding SikaCem plasticizer on the physical and mechanical properties of conventional concrete with f’c = 210 kg/cm². The research followed a quantitative, applied, and explanatory approach. The results demonstrated that the incorporation of SikaCem significantly improves the workability of concrete. Additionally, it increases compressive strength by 44.09% and flexural strength by 14%, with the optimal design being the one using 500 ml of the additive. In conclusion, the addition of SikaCem plasticizer, in dosages of 250, 375, and 500 ml, optimizes both physical properties (workability) and mechanical properties (compressive and flexural strength), offering practical solutions to improve the quality of concrete in construction.

The main purpose of the present investigation was to analyze the axial compression resistance of a concrete F'c = 210 Kg/cm² incorporating glass as an ecological material and determine the appropriate percentage as evaluated. To achieve this, a partial replacement of the cement was carried out with the following percentages (9%, 11% and 22%) of ground glass, in order to compare conventional or standard concrete with an ecological concrete explained above. The study began with the analysis of the physical-mechanical properties of the coarse and fine aggregates, which concluded with the determination of their granulometry, unit weight, moisture content, specific weight and their absorption. Based on the data from the aggregate tests, the concrete mix was designed according to the cement replacement percentages, in which a slump of 3-4” (inches) was used to guarantee adequate workability of the material. . Subsequently, a total of 72 6” x 12” cylindrical tests or witnesses were prepared between conventional concrete and the replacement of the three mentioned percentages. The objective was to determine what was the optimal replacement percentage for ground glass for a f'c = 210 Kg/cm². The concrete core breakage tests were carried out 7, 14 and 28 days after entering the curing pond. The appropriate percentage for the mix design resulted in 11% cement replacement since at the age of 28 days of curing, 312.64 kg/cm² was recorded, which means an increase in resistance of 48.88%.

In the construction industry, concrete is the most widely used material because of its versatility, strength, and durability, playing a crucial role in infrastructure and building projects. Its quality depends on multiple factors, including the curing method, which ensures proper hydration of the cement and optimizes its structural performance. Curing is essential to ensure the formation of a homogeneous internal microstructure, which improves compressive strength and minimizes internal defects. The research aimed to compare the compressive strength of concrete subjected to four curing methods: immersion, irrigation, waterproofing admixture (Sika Antisol S) and plastic coating, under the climatic conditions of Cajamarca. This analysis provides valuable data that improve curing techniques, optimizing concrete strength in similar contexts. An experimental design with a quantitative approach was used, employing 36 cylindrical concrete specimens, evaluated at intervals of 7, 14 and 28 days. The results at 28 days indicated that immersion curing presented the highest strength with 27,27 MPa, followed by admixture curing with 27,12 MPa, irrigation curing with 25,20 MPa and plastic coating with 22,58 MPa. It is concluded that immersion curing stood out as the most effective method, demonstrating superior performance with respect to the other methods evaluated. However, this method cannot be used in real structures; therefore, the use of curing additives is suggested as a curing method.