18 research outputs found
Experimental investigation on the bond behavior of a compatible TRM-based solution for rammed earth heritage
Despite the current awareness of the high seismic risk of earthen structures, little has been done so far to develop proper strengthening solutions for the rammed earth heritage. Based on the effectiveness of TRM for masonry buildings, the strengthening of rammed earth walls with externally bonded fibers using earth-based mortar is being proposed as a compatible solution. In this context, the investigation of bond behavior was conducted by means of direct tensile tests, pull-out tests and single lap-shear tests. The specimens were prepared using earth-based mortars and two different types of meshes (glass and nylon) while considering different-bonded lengths. The direct tensile tests on TRM coupons showed the high capacity of the nylon mesh in transferring stresses after cracking of the mortar. The pull-out tests highlighted that in the case of glass fiber mesh, the bond was granted by friction, while the mechanical anchorage promoted by the transversal yarns granted the bond of the nylon mesh. Finally, the single lap-shear tests showed that the adopted earth-based mortar seems to limit the performance of the strengthening.This work was supported by the Fundacao para a Ciencia e a Tecnologia [PTDC/ECM-EST/2777/2014, SFRH/BD/131006/2017, SFRH/BPD/97082/2013]
Durability properties of structural concrete containing very fine aggregates of marble sludge
Carbonation of concrete made with high amount of fly ash and recycled concrete aggregates for utilization of CO2
Re-cycling of construction and demolition waste and steel slag: characterization of the durability
Experimental study of the mechanical properties and shrinkage of self-compacting concrete with binary and ternary mixes of fly ash and limestone filler
Influence of chloride contamination on carbonation of cement-based materials
An experimental investigation was conducted to understand the effect of the presence of chloride on the carbonation front. Microstructural analysis was conducted to verify the carbonation development in material previously contaminated by chlorides. Accelerated tests were combined to understand how the presence of chlorides influences carbonation front and how chloride test method influences in these results. The results indicate that the presence of chloride decreases the carbonation front in cementbased
materials. This behaviour is related to the pore refinement and humidity retention caused by chloride. The impact on carbonation reduction occurs at different levels, according to the testing method used
The SHARE European Earthquake Catalogue (SHEEC) 1000–1899
In the frame of the European Commission
project “Seismic Hazard Harmonization in Europe”
(SHARE), aiming at harmonizing seismic hazard at a
European scale, the compilation of a homogeneous,
European parametric earthquake catalogue was planned.
The goal was to be achieved by considering the most
updated historical dataset and assessing homogenous
magnitudes, with support from several institutions. This
paper describes the SHARE European Earthquake
Catalogue (SHEEC), which covers the time window
1000–1899. It strongly relies on the experience of the
European Commission project “Network of Research
Infrastructures for European Seismology” (NERIES), a
module of which was dedicated to create the European
“Archive of Historical Earthquake Data” (AHEAD) and
to establish methodologies to homogenously derive earthquake
parameters from macroseismic data. AHEAD has
supplied the final earthquake list, obtained after sorting duplications out and eliminating many fake events; in
addition, it supplied the most updated historical dataset.
Macroseismic data points (MDPs) provided by AHEAD
have been processed with updated, repeatable procedures,
regionally calibrated against a set of recent, instrumental
earthquakes, to obtain earthquake parameters. From the
same data, a set of epicentral intensity-to-magnitude relations
has been derived,with the aimof providing another set
of homogeneous Mw estimates. Then, a strategy focussed
on maximizing the homogeneity of the final epicentral
location and Mw, has been adopted. Special care has been
devoted also to supply location and Mw uncertainty. The
paper focuses on the procedure adopted for the compilation
of SHEEC and briefly comments on the achieved results