Conference Agenda

The present research work is based on analyzing the results of the influence of sugarcane bagasse ash (CBCA), a natural polymer ash, on concrete with f'c=210 kg/cm2, made with aggregates. from the Pampa Azul quarry, in order to analyze and compare the results of compressive strength in different percentages of CBCA addition (2%, 4% and 7%). Likewise, the physical characteristics of the aggregates were determined according to the ASTM C 136 / NTP 400.012 standard, to then carry out the mix design according to the ACI Committee 211.1.

The mixture design of the pattern concrete and concrete was carried out, adding the percentages of CBCA (2%, 4% and 7%), of which 36 specimens of 100 mm x 200 mm were prepared (ASTM C 192 / NTP 339.183). , prepared in the laboratory of the Universidad Privada del Norte, which were compression tests (ASTM C 39 - 18 / NTP 339.034) at 7, 14 and 28 days of curing, obtaining with 2% CBCA a resistance of 233.5 kg/cm2, representing an increase of 1.83%; with 4% CBCA a resistance of 245.9 kg/cm2, representing an increase of 4.03% and with 7% CBCA a resistance of 264.5 kg/cm2, representing an increase of 12.02% compared to the standard concrete.

From the results obtained, it is concluded that the addition of CBCA in the concrete is very favorable in the percentages of 4% and 7%, obtaining greater results compared to the standard concrete.

This study analyzes the effects of incorporating microsilica and synthetic macrofibers into concrete with a characteristic strength of f’c=280 kg/cm², intended for rigid pavements. Proportions of microsilica (2%, 4%, and 6%) and synthetic macrofibers (4, 6, and 8 kg/m³) were considered to evaluate physical and mechanical properties such as slump, temperature, unit weight, compressive strength, and flexural strength, following ASTM and NTP standards. The results show that 6% microsilica and 6 kg/m³ of macrofibers are optimal. Knowing this, in situ tests were conducted, including the diamond test, by preparing three panels: a standard panel, another with 6 kg of macrofibers, and another with 6% microsilica. This study contributes to the design of durable and efficient pavements to improve urban infrastructure.

This study evaluated the properties of concrete with maguey fibers, comparing mixtures with 2% and 4% fiber against conventional concrete with resistance f'c: 210 kg/cm². 27 specimens were worked, 9 of which were the standard specimens, 9 with 2% and 9 with 4%. Tests were carried out on the temperature of fresh concrete, compressive strength and sclerometry. The results showed that the maguey fiber did not affect the temperature of the concrete but reduced its workability. The concrete with 2% fiber reached a compressive strength of 177.20 kg/cm² at 28 days, while the concrete with 4% fiber presented a resistance of 54.62 kg/cm². The pattern concrete, without the addition of fibers, reached a resistance of 270.57 kg/cm². Sclerometry indicated better results for concrete with 2% fiber compared to 4%. It is recommended to use up to 2% of maguey fiber in low resistance applications, such as pedestrian pavements and non-structural elements, ensuring a homogeneous mixture and using plasticizing additives to improve workability.

Demolition of deteriorated pavements generates large volumes of waste that contaminate the environment. The use of Reclaimed Asphalt Pavement (RAP) in the production of Hot Asphalt Mixtures (HMA) presents a sustainable alternative that turns waste into an integral component of new pavements. The objective of the research is to analyze the properties of dense HMA mixtures incorporating RAP with 30% and 40% contributions in order to identify the benefits that its production can offer. Using the control mix from a predecessor study as a comparative base, the research aims to identify the influence that RAP contributions will have on the stability and flow of the HMA through the Marshall method and on the tensile strength in relation to the change in moisture resistance. For the HMA with a 30% RAP contribution, an optimal asphalt content of 5.3%, a Marshall stability of 3564lbs, a flow of 11.64/100”, and a tensile strength ratio of 82.6% were determined. For the HMA with a 40% RAP contribution, an optimal asphalt content of 5.23%, a Marshall stability of 3502lbs, a flow of 10.97/100”, and a tensile strength ratio of 80.4% were determined. It is concluded that with the increase of RAP, the optimal asphalt content decreases and the susceptibility to moisture damage increases. All determined results are within the standards, so the use of RAP represents a good alternative to HMA made with 100% virgin aggregates.

The research focused on the remaining spaces in the city of Tumbes, Peru, which are forgotten and problematic areas and can become an opportunity to transform them into places that are pleasant for the population. The general objective was to determine the public perception of pollution in these areas and their attitude towards a proposal for recovery, whose main strategy was to articulate the shores and give recreational use to the population. A quantitative and descriptive research was carried out, using the survey of population over 15 years old as an instrument. The results show that most are aware of the high level of pollution and agree to maintain and care for the new public space.

This study seeks to address the challenges posed by hydraulic head management in diversion dams, focusing especially on reducing scour and improving riverbed stability. To achieve this, mechanisms such as stilling basins, designed to reduce the kinetic energy of water flow and thus minimize downstream erosion risks, were evaluated. Using the "Tres Molinos" dam in Cajamarca, Peru, as a reference, a 1:25 scale physical model was built at the Water Resources Laboratory of the National University of Cajamarca, taking into account hydraulic similarity principles. Through experimental tests carried out on this model, the flow characteristics at different depths of the stilling basin could be analyzed. The results demonstrated a considerable reduction in flow velocity and scour downstream of the mitigation structure, with velocities ranging from 0.276 m/s to 0.667 m/s and scour depths varying from 1.5 cm to 6.9 cm, confirming the effectiveness of an appropriate design of energy dissipation structures not only to control flow velocity but also to reduce scour and improve the stability of hydraulic infrastructures. Furthermore, the results showed a remarkable efficiency in energy dissipation, reaching up to 56% in flow velocity reduction and up to 60% decrease in scour compared to a diversion dam without a stilling basin.