Métodos y Materiales

Use of sargassum and other organic substitutes in the construction industry. A review

Julio Cruz — 2024-01-30

Currently, sargassum, due to the large quantities that have arrived on the coasts of Mexico and other parts of the world, has become an environmental, economic and health problem, which makes its study important to provide value. Sargassum has been used for the production of biofuels and bioremediation, however, to the large amount of this organic material, the construction industry has used it in its raw state as a cementitious substitute. The objective of this article is to know the potential use of sargassum ash as a cementitious substitute, comparing it with various organic biomasses that have been used for the same purpose, for which a bibliographic review of organic biomasses, their characteristics, substitution percentages has been carried out. and its application. The above will provide knowledge of the properties that ash must contain for its application either in mortars or pastes that improve long-term durability, to advance sustainable construction.

Operational modal analysis of a building using commercial computer programs

María Fernanda Padilla Benavides — 2023-12-12

This paper presents the modal parameters of a 17,5 m high building, due to environmental vibrations, obtained using methods in the frequency and time domain available in the ARTeMIS Modal v.5.0 software, with the aim to evaluate its efficiency to conduct Operational Modal Analysis using data of ambient vibration tests in buildings. In the measurement, the roving sensors technique was used for a total of six test setups, with four TitanSMA triaxial accelerographs. The processing was carried out using the softwares: Geopsy and ARTeMIS Modal, with which no difference was found, and in the analysis five vibration modes were identified through spectral analysis, while the results in the time domain were inconsistent. In addition, the Modal Assurance Criterion (MAC) was used for a cross control between the modal shapes obtained with the two different domains (time and frequency).

Influence of the superplasticizing additive in concrete with lateritic aggregate

Andrea Suárez Ferrufino — 2022-12-14

Due to the scarcity and high transportation costs of stone aggregates in the east and northeast of Bolivia, different alternatives have been sought for their partial or complete replacement in the construction industry and, specifically, to produce concrete. The objective of this research is to evaluate the workability, compressive strength, and ultrasonic pulse velocity (UPV) of concrete produced entirely with coarse lateritic aggregates and a commercial superplasticizer additive. Using the IPT/EPUSP method, concrete with coarse lateritic aggregate was dosed for 30 MPa (design compressive strength). Five different percentages of additive (by weight of cement) were considered: 0% (reference), 0.6, 0.8, 1 and 1.2%. Although the superplasticizer additive improves workability at higher percentages, the mixtures with 0.6, 0.8 and 1% presented higher compressive strength and VPU, when compared to the reference (0%). 1.2% of additive presented the lowest values of compressive strength and VPU. The use of additives, in this case superplasticizer, is beneficial for the workability and compressive strength of lateritic concrete, but the most appropriate content for its use must be defined.

Sustainability level index for a simplified comparative analysis of laminated timber and other similar elements for sustainable construction in México.

Mariana López Tenorio — 2023-01-31

In this project, the feasibility of laminated wood beams as a sustainable construction option in comparison to traditional materials is presented. To do this, an evaluation index was developed, wich takes into account the information of content, distance, process, modulation and maintenance of each material; providing a simplified and preliminary result of the sustainability of the materials for decision making in projects. Additionally the laminated beam, solid wood beam, concrete beam and steel beam were evaluated. Confirming that wood is a more environmentally friendly material, wheter presented as a solid wood beam or laminated beam.