The Experts below are selected from a list of 44022 Experts worldwide ranked by ideXlab platform

K Imamoto - One of the best experts on this subject based on the ideXlab platform.

  • residual service life of carbonated structures based on site non Destructive Tests
    Cement and Concrete Research, 2018
    Co-Authors: R Neves, R Torrent, K Imamoto
    Abstract:

    Abstract Assessing the residual service life of carbonated reinforced concrete structures is typically conducted by measuring cover depths and carbonation of drilled cores, assuming the “square root law” for the progress of the carbonation front. Given the large spatial variability of carbonation depths, the required number of cores becomes prohibitive. A model is presented, based on numerous experimental data, by which the carbonation rate can be estimated by means of non-Destructive site measurements of the air-permeability kT. A Weibull distribution of the carbonation rate Kc is fitted to the results, which is a function of kT. Hence, for each kT value measured on site coupled with the cover depth xd, expected, optimistic and pessimistic values of the corrosion initiation time can be obtained without the need of drilling cores. The method is validated on 111 paired results of kT and xd, obtained on the emblematic Tokyo's Museum of Western Art.

J Norambuenacontreras - One of the best experts on this subject based on the ideXlab platform.

  • mechanical characterization of rubble stone masonry walls using non and minor Destructive Tests
    Construction and Building Materials, 2013
    Co-Authors: I Lombillo, C Thomas, L Villegas, J P Fernandezalvarez, J Norambuenacontreras
    Abstract:

    Abstract As is well known, the diagnostic analysis of ancient buildings supposes important challenges from the point of view of its evaluation under field conditions. In this context, Non and Minor Destructive Techniques (N&MDTs) can be used for the mechanical characterization of ancient buildings. However, there are not many examples of application of the techniques in rubble stone masonry. Therefore, this paper presents a preliminary experimental study by using N&MDTs applied in a particular construction: the Riva–Herrera palace located in Santander, Northern Spain. In this way, different non and minor Destructive techniques as flat jack, hole-drilling and sonic Tests have been used in order to evaluate the mechanical and morphological characteristics of different rubble stone masonry walls, under field conditions. The results of this study show that the N&MDTs used in this study can be potentially used for providing valuable information about the mechanical and morphological characteristics of rubble stone masonry walls. In addition, this knowledge of great important in the intervention process has been obtained with a minimal effect on the structural component analyzed.

Marco Savoia - One of the best experts on this subject based on the ideXlab platform.

  • Destructive and minor Destructive Tests on masonry buildings experimental results and comparison between shear failure criteria
    Construction and Building Materials, 2019
    Co-Authors: Francesca Ferretti, Barbara Ferracuti, Claudio Mazzotti, Marco Savoia
    Abstract:

    Abstract In this paper, an extensive experimental campaign conducted on existing masonry buildings is presented. The main objective of this activity was to study the shear behaviour of masonries constituted by clay bricks and lime-based mortar evaluating the most suitable techniques applicable to get reliable information on the material mechanical properties. Minor Destructive Tests (MDT) and Destructive Tests (DT) were performed on eight masonry buildings, damaged by the 2012 Emilia earthquake (Italy). The Tests results are here presented and discussed, focusing on the strength parameters obtainable from each test type and on the definition of appropriate failure domains. The strength predictions are finally compared with the outcomes of full-scale Destructive Tests.

R Neves - One of the best experts on this subject based on the ideXlab platform.

  • residual service life of carbonated structures based on site non Destructive Tests
    Cement and Concrete Research, 2018
    Co-Authors: R Neves, R Torrent, K Imamoto
    Abstract:

    Abstract Assessing the residual service life of carbonated reinforced concrete structures is typically conducted by measuring cover depths and carbonation of drilled cores, assuming the “square root law” for the progress of the carbonation front. Given the large spatial variability of carbonation depths, the required number of cores becomes prohibitive. A model is presented, based on numerous experimental data, by which the carbonation rate can be estimated by means of non-Destructive site measurements of the air-permeability kT. A Weibull distribution of the carbonation rate Kc is fitted to the results, which is a function of kT. Hence, for each kT value measured on site coupled with the cover depth xd, expected, optimistic and pessimistic values of the corrosion initiation time can be obtained without the need of drilling cores. The method is validated on 111 paired results of kT and xd, obtained on the emblematic Tokyo's Museum of Western Art.

Anibal Costa - One of the best experts on this subject based on the ideXlab platform.

  • assessment of mechanical properties of full scale masonry panels through sonic methods comparison with mechanical Destructive Tests
    Structural Control & Health Monitoring, 2016
    Co-Authors: Luis Miranda, L Cantini, Joao Miranda Guedes, Anibal Costa
    Abstract:

    Summary Sonic Tests are a valid and useful non-Destructive method for qualitative characterization of masonry elements. If sonic Tests are applied with the right configuration, the results can identify discontinuities in masonry sections and provide the morphology of a construction typology, contributing to the assessment of built heritage as demanded by the international recommendations on this domain. The elaboration of data from sonic Tests applied to masonry structures has been essentially based on the evaluation of the P waves' propagation through the masonry thickness, that is, by using the direct sonic method, a procedure that has been calibrated for many years by different authors. However, recent studies have shown that indirect configurations through the indirect sonic impact method may be used to estimate the mechanical properties of stones masonry samples. This procedure allows assessing not only P but also R wave propagation, permitting to estimate the deformability characteristics of masonry panels. Under this research, a set of stone masonry specimens was tested using both direct and indirect sonic impact methods and later assessed through laboratory mechanical compression Tests, a procedure's sequence that allow validating the sonic Tests capabilities. Copyright © 2015 John Wiley & Sons, Ltd.