Conference Agenda

The present study is based on the use of crushed fan shell waste (FSW) between the sizes of 0.6 mm and 2.36 mm incorporated in the concrete mix to measure its properties in the fresh and hardened state. This waste product is of great interest for the construction sector, as an additive or as a partial or total replacement of aggregates in the production of concrete or as a soil amendment. The experimental design consists of the preparation of two concrete mixes designed for strengths of f'c=175 kg/cm² (M1) and f'c=210 kg/cm² (M2) and water/cement ratios of 0.61 and 0.55, respectively. The mixes were supplemented with 5, 10, and 15% crushed FSW to replace the fine aggregate, and the mix was evaluated for workability in fresh concrete, compressive strength, and indirect tensile strength in hardened concrete after 14 and 28 days of curing. Flowability and consistency were slightly affected, as were plasticity and workability for M1 and M2, respectively. The design compressive strength was exceeded by both experimental specimens (M1 and M2), reaching 196.99 and 234.86 kg/cm², respectively. Indirect tensile strength showed a slight decrease as the amount of FSW was increased, reaching up to 20.09 kg/cm² for M2. Finally, the results showed that the replacement at 5% guaranteed a higher compressive strength of the concrete at 28 days, although at 10 and 15% also exceeded the design strength.

The research focused on analyzing the effect of fly ash (FA) and polypropylene fibers (PPF) on the mechanical properties of concrete with a compressive strength of f’c = 280 kg/cm². The objective was to determine the influence of adding FA and PPF on the mechanical properties of the concrete. Concretes with FA in proportions of 5%, 10%, and 15%, and PPF in amounts of 350 g/m³, 480 g/m³, and 530 g/m³ were analyzed, evaluating their compressive strength (CS) at 7, 14, and 28 days, and their indirect tensile strength (ITS) at 28 days. Regarding CS, the results showed that at 7 days, the concrete without additives reached 128.05 kg/cm², while with 10% FA and 480 g/m³ of PPF, the strength increased to 256.81 kg/cm². At 14 days, the concrete without additives achieved 155.80 kg/cm², improving to 280.88 kg/cm² with the additives. At 28 days, the concrete without additives reached 281.68 kg/cm², while with 10% FA and 480 g/m³ of PPF, the strength increased to 383.75 kg/cm². Regarding ITS, it was observed that with 10% FA and 480 g/m³ of PPF, the highest strength was obtained, with 49.57 kg/cm². In conclusion, the appropriate proportion of additives to improve the mechanical properties of the concrete is 10% FA and 480 g/m³ of PPF.

In the present investigation, volcanic tuff extracted from the Sexi quarry was used as a new addition to Portland Cement, which allows improving the compressive strength of the mortar. Having as general objective: Determine the compressive strength of the Cement-Sand mortar with the addition of volcanic tuff at 5%, 10% and 15%. This objective was obtained through the execution of a methodology, which consisted of carrying out previous tests to determine the properties of the materials used in the preparation of the mortar, then the analysis of the data obtained was carried out to carry out the mixture design, subsequently , the mortar specimens with a side of 50 mm were made, the next day the formwork was removed, labeled, cured, and then tested after 7, 14, 28 days, finally, the specimens were subjected to compression tests. After 28 days of testing, it was obtained that the average maximum compressive strength was 183.26 kg/cm2 corresponding to the specimens with 15% addition and a minimum of 163.06 kg/cm2 for the standard sample. Concluding, that by adding a greater percentage of volcanic tuff, the compressive strength increases, after 7, 14, 28 days.

Road infrastructure plays a crucial role in economic growth and promoting decent employment by connecting different regions and cities through roads and highways. The use of recycled materials offers an alternative to optimize and reduce resources while improving the physical and mechanical properties of the soil, which in turn reduces costs. The purpose of this study was to evaluate the effect of pine ash (CP) and Donax obesulus dust (PDO) on the natural soil sample with dosages of 10% and 16%. It is a basic type study, with a quantitative approach and according to its explanatory level, with a quasi-experimental design with post-test. The most optimal dosage was 16% CP and 16% PDO, a variation with respect to the natural soil (NS) of MDS of 1,680 gr/cm³ to 1,799 gr/cm³, OCH of 5.87% to 2.00% and CBR of 8.4% was achieved. to 24.17%. According to statistical tests, the parallel dosages of both materials contribute to good compaction, bearing capacity and resistance in low quality soils intended for subgrade.

The present research proposes an improvement to the usual design of a braced tower according to the standards used in Latin America. When carrying out structural reinforcement work on a tower, a structural failure was detected with successive antenna falls and loss in the transmission signal, revealing a notable deficiency in the mast coupling area. However, to carry out structural evaluations, the IDEA StatiCa and Sap2000 software were used, three additional areas with possible failures were also identified, attributed to the inadequate application in 3 types of connections: Union of the base, union between the sections at 3 meters and in the bracing of the tower. In the mentioned areas, they were evaluated with the failure criterion of the Von Mises stress analysis with steel creep of 2277.00 kg/cm2, this being the maximum parameter that can be reached with the ASTM A-36 and A-53 material. The existing tower has the shape of an equilateral triangle where it shows hidden defects, thus proposing a circular design, using the ANSI TIA 222-H standard. The results in the union of the triangular base, union between sections at 3 meters and in the bracing of the tower, do not meet the Von Mises failure criterion, thus surprising in surpassing this. In conclusion, the proposed elements present a correct design in the connections in the braced towers, presenting reliability in their future manufacturing.

In this research, the main objective is to determine the compressive and flexural resistance of traditional adobe by adding 1.5%, 3.0% and 4.5% of cabuya fiber. In order to achieve this objective, different soil tests had to be carried out such as They are: moisture content, dry granulometric analysis, washing granulometric analysis, atterberg limits (liquid limit and plastic limit) and modified poctor. With the sole intention of having the necessary evidence and thus being able to make adobes, a mold or adobera with dimensions indicated in Standard E-080 was used, establishing measurements for the specimens and being able to present them in this investigation. A total of 60 artisanal adobes were made, of which 36 adobes were tested in compression and 24 adobes in flexion. The hypothesis states that the addition of cabuya fiber increases the compression and bending resistance by up to 5%. The results showed that the addition of cabuya fiber in the percentages of 1.5%, 3.0% and 4.5% reached a resistance of 13.71 kg/cm2, 15.37 kg/cm2 and 17.36 kg/cm2 respectively with an increase of 6.33% with respect to The standard sample obtained a resistance of 12.23 kg/cm2. With respect to bending, the results were 1.22 kg/cm2 for the addition of 1.5% of cabuya fiber, 1.72 kg/cm2 for the addition of 3.0% of cabuya fiber and 1.88 kg/cm2 for the addition of 4.5% of cabuya fiber with an increase of 9.82% with respect to the standard sample that was obtained of 0.82 kg/cm2, therefore we say that the hypothesis is fulfilled.