|   | 
Details
   web
Records
Author (up) Araya-Letelier, G.; Antico, F.C.; Burbano-Garcia, C.; Concha-Riedeld, J.; Norambuena-Contreras, J.; Concha, J.; Saavedra Flores, E.I.
Title Experimental evaluation of adobe mixtures reinforced with jute fibers Type
Year 2021 Publication Construction and Building Materials Abbreviated Journal Constr. Build. Mater.
Volume 276 Issue 2021 Pages 122127
Keywords Jute fibers; Fiber-reinforced composites; Thermal conductivity; Mechanical characterization; Damage and durability assessment
Abstract Due to their sustainability as well as physical and mechanical performance, different natural fibers, both vegetal and animal fibers, have been successfully used in adobe mixtures (AMs) to enhance properties such as cracking control, flexural toughness and water erosion resistance, among others. However, the use of jute fibers (JFs), one of the most largely produced vegetal fiber worldwide, has not been extensively studied on AMs. Consequently, this study evaluates the effects of the incorporation of varying dosages (0.5 and 2.0 wt%) and lengths (7, 15, and 30 mm) of JFs on the physical/thermal/mechanical/fracture and durability performance of AMs, a specific type of earth-based construction material widely used globally. Experimental results showed that the incorporation of 2.0 wt% dosages of JFs increased the capillary water absorption of AMs, which might affect AM durability. The latter result could be explained by the additional porosity generated by the spaces left between the JFs and the matrix of adobe, as well as the inherent water absorption of the JFs. The incorporation of JFs significantly improved the behavior of AMs in terms of thermal conductivity, drying shrinkage cracking control, flexural toughness and water erosion performance, without affecting their compressive and flexural strength. For example, flexural toughness indices were increased by 297% and crack density ratio as well as water erosion depth values were reduced by 93% and 62%, respectively, when 2.0 wt%-15 mm length JFs were incorporated into AM. Since the latter combination of JF dosage and length provided the overall best results among AMs, it is recommended by this study as JF-reinforcement scheme for AMs for construction applications such as adobe masonry and earth plasters.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0950-0618 ISBN Medium
Area Expedition Conference
Notes Approved
Call Number UAI @ alexi.delcanto @ Serial 1315
Permanent link to this record
 

 
Author (up) Carrasco, M.; Alvarez, F.; Velazquez, R.; Concha, J.; Perez-Cotapos, F.
Title Brush-Holder Integrated Load Sensor Prototype for SAG Grinding Mill Motor Type
Year 2019 Publication Electronics Abbreviated Journal Electronics
Volume 8 Issue 11 Pages 14 pp
Keywords electrical motor sensor; SAG grinding mill motor; inspection protocol; mining industry
Abstract One of the most widely used electro-mechanical systems in large-scale mining is the electric motor. This device is employed in practically every phase of production. For this reason, it needs to be inspected regularly to maintain maximum operability, thus avoiding unplanned stoppages. In order to identify potential faults, regular check-ups are performed to measure the internal parameters of the components, especially the brushes and brush-holders. Both components must be properly aligned and calibrated to avoid electric arcs to the internal insulation of the motor. Although there is an increasing effort to improve inspection tasks, most inspection procedures are manual, leading to unnecessary costs in inspection time, errors in data entry, and, in extreme cases, measurement errors. This research presents the design, development, and assessment of an integrated measurement prototype for measuring spring tension and other key parameters in brush-holders used in electric motors. It aims to provide the mining industry with a new, fully automatic inspection system that will facilitate maintenance and checking. Our development research was carried out specifically on the brush system of a SAG grinding mill motor. These machines commonly use SIEMENS motors; however, the instrument can be easily adapted to any motor by simply changing the physical dimensions of the prototype.
Address [Carrasco, Miguel; Concha, Javier; Perez-Cotapos, Francisco] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Av Diagonal Las Torres 20700, Santiago 7941169, Chile, Email: miguel.carrasco@uai.cl;
Corporate Author Thesis
Publisher Mdpi Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2079-9292 ISBN Medium
Area Expedition Conference
Notes WOS:000502269500023 Approved
Call Number UAI @ eduardo.moreno @ Serial 1066
Permanent link to this record
 

 
Author (up) Carrasco, M.; Alvarez, F.; Velazquez, R.; Concha, J.; Perez-Cotapos, I.
Title Inline Force Sensor Development for Electrical Motors for Mining Operations in Chile: A New Inspection Protocol Type
Year 2018 Publication Ieee Latin America Transactions Abbreviated Journal IEEE Latin Am. Trans.
Volume 16 Issue 1 Pages 66-74
Keywords electrical motor sensor; SAG grinding drill motor; inspection protocol
Abstract Electric motors are among the most widely used electro-mechanical systems in the mining industry in Chile. As they are physically present in virtually all phases of the production process, they must be regularly inspected. In order to maintain a maximum level of operability and to avoid the occurrence of catastrophic failures and unscheduled stoppages, regular, planned reviews to measure the internal parameters of their components are performed manually. This part of the process presents serious shortcomings, such as significant inspection times, information input errors and, in some cases, measurement errors resulting from the technical difficulty of physically taking the measurement. This research presents the design, development and evaluation of a new sensor to support the inspection of brush-holder spring tensions as well as the integration of a digital gauge to control other critical dimensions of the brush-holder mounting. Its purpose is to provide the mining industry with a new system and a fully automated inspection protocol to ease maintenance and control tasks, particularly focusing on reducing inspection times. These products are expected to increase the equipment operating life, as well as delivering a maintenance report of the motor's key parameters which directly benefits the Key Performance Indicators (KPI) of mining management
Address [Carrasco, M.; Concha, J.; Perez-Cotapos, I.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Av Diagonal Torres 2700, Penalolen, Santigo, Chile, Email: miguel.carrasco@uai.cl;
Corporate Author Thesis
Publisher Ieee-Inst Electrical Electronics Engineers Inc Place of Publication Editor
Language Portuguese Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1548-0992 ISBN Medium
Area Expedition Conference
Notes WOS:000425326100012 Approved
Call Number UAI @ eduardo.moreno @ Serial 834
Permanent link to this record