A5054649058- Geotechnical Engineering and Underground Structures
- Geotechnical Engineering and Soil Mechanics
- Geotechnical Engineering and Soil Stabilization
- Seismic Waves and Analysis
- Concrete and Cement Materials Research
- Geophysical Methods and Applications
- Ultrasonics and Acoustic Wave Propagation
- Grouting, Rheology, and Soil Mechanics
- Seismic Imaging and Inversion Techniques
- Landslides and related hazards
- Soil Management and Crop Yield
- Geotechnical Engineering and Analysis
- Geotechnical and construction materials studies
- Structural Health Monitoring Techniques
- Vibration and Dynamic Analysis
- Geophysical and Geoelectrical Methods
- Railway Engineering and Dynamics
- Innovative concrete reinforcement materials
- Catalysis and Hydrodesulfurization Studies
- Thermochemical Biomass Conversion Processes
- Seismic Performance and Analysis
- Petroleum Processing and Analysis
- Concrete Properties and Behavior
- Landfill Environmental Impact Studies
- Structural Load-Bearing Analysis
Universidade do Porto
2015-2024
University of Minho
2011-2022
Instituto de Desenvolvimento Sustentável Mamirauá
2021
Centro Hospitalar de Vila Nova de Gaia
2020
ASM International
2020
Instituto de Catálisis y Petroleoquímica
2018
University of Lisbon
2014
IFP Énergies nouvelles
2014
Instituto Superior Técnico
2009
Instituto de Biologia Experimental e Tecnológica
2009
Abstract Bender element (BE) testing is a powerful and increasingly common laboratory technique for determining the shear S-wave velocity of geomaterials. There are several advantages BE testing, but there no standard developed procedures or interpretation results. This leads to high degree uncertainty subjectivity in interpretation. In this paper, authors review most methods tests, discuss some important technical requirements minimize errors, propose practical framework based on comparison...
Alkaline activation of fly ash (FA) was used to improve the mechanical performance a silty sand, considering this new material as replacement for soil-cement applications, namely, bases and subbases, transportation infrastructures. For that purpose, specimens were molded from mixtures soil, FA, an alkaline activator made sodium hydroxide silicate. Uniaxial compression tests showed strength is highly increased by addition binder. The results described high stiffness material, with initial...
Alkaline activation of fly ash creates a geopolymeric cement that can replace ordinary portland in several applications such as soil improvement, with the advantage much lower carbon dioxide emissions and reusing an industrial by-product otherwise landfilled, which averts environmental problems. In this paper, behavior silty sand improved by alkaline is analyzed from small to large strains presenting uniaxial drained triaxial compression test results seismic wave velocities measured...
Methods to estimate the liquefaction resistance in sandy soils have been proposed literature, involving correlations between cyclic ratio and seismic wave velocities measured by situ laboratory tests. However, applicability of these has not validated sands improved with induction partial saturation. This study addresses assessment improvement induced saturation using wave-based approaches. For this purpose, an experimental plan comprising triaxial bender elements was carried out a Portuguese...
Soil stiffness can be estimated by geophysical and dynamic testing methods. In the laboratory, most common methods to measure small-strain are bender elements (BE) resonant-column (RC) tests. This paper focuses on comparison between results of sands BE RC For this purpose, an experimental program involving three liquefiable sandy soils (i.e., NB, TP-Lisbon Toyoura sands) was carried out. Such covered measurement these in triaxial apparatuses for different mean effective stress conditions....
Recently, an innovative technique based on continuous modal identification of the first flexural resonant frequency a simply supported composite beam has been proposed for evaluation E modulus concrete from instant casting (termed EMM-ARM: elasticity measurement through ambient response method), and successfully compared with other existing techniques. In view its potential applications laboratory in situ characterisation cement-stabilised soils, extension using EMM-ARM these materials...
This paper tries to characterize volcanic rocks through the development and application of an empirical geomechanical system. Geotechnical information was collected from samples several Atlantic Ocean islands including Madeira, Azores Canarias archipelagos. An rock classification system termed as (VRS) is developed presented in detail. Results using VRS are compared with those obtained traditional mass rating (RMR) Data mining (DM) techniques applied a database islands. Different algorithms...
Earthquake-induced liquefaction is one of the major causes building damage as it decreases strength and stiffness soil. The resistance soils increases significantly degree saturation decreases, making soil desaturation an effective measure for mitigation this phenomenon. This paper presents a comparative analysis alluvial sand from Aveiro (Portugal) under fully partially saturated conditions. For purpose, in situ characterisation based on CPTu laboratory series cyclic triaxial tests were...
In 2009, a new methodology for the continuous monitoring of E-modulus cement-based materials since casting was proposed, under designation EMM-ARM (E-modulus Measurement through Ambient Response Method). This is variant to classic resonant frequency methods that allows stiffness from instant casting. After encouraging results obtained in first applications cement pastes, present paper gives continuity previous developments, validations with additional experimental methodologies and extension...
Dam B1 was approximately 85 m high and 700 long along the crown when it suddenly failed in 25th of January, after 41 years operations deposition tailings at Paraopeba mining complex (Côrrego de Feijão), Minas Gerais, Brazil. More than 250 people died vast economic, social environmental damages resulted from collapse. Given need to geotechnically characterise within dam for a credible computational model failure, an extensive sampling laboratory testing campaign took place. The geotechnical...
Abstract This paper presents the results of an experimental program carried out in laboratory aimed at assessing liquefaction resistance by correlations between longitudinal wave (P-wave) and shear (S-wave) velocities (VP VS) cyclic stress ratio from triaxial testing (CSRCTx) for different degrees saturation (Sr). The was assessed using a apparatus equipped with Hall-effect transducers bender elements, combining stress-based (large-strain level) wave-based (small-strain approaches. These...