Publicacións

@article{francioso_curing_2019,

title = {Curing temperature: A key factor that changes the effect of TiO2 nanoparticles on mechanical properties, calcium hydroxide formation and pore structure of cement mortars},

author = {Vito Francioso and Carlos Moro and Isabel Martínez-Lage and Mirian Velay-Lizancos},

url = {https://www.sciencedirect.com/science/article/pii/S0958946519304494},

doi = {10.1016/j.cemconcomp.2019.103374},

issn = {0958-9465},

year  = {2019},

date = {2019-11-01},

urldate = {2026-08-06},

journal = {Cement and Concrete Composites},

volume = {104},

pages = {103374},

abstract = {There are several studies about the effects of addition of TiO2 nanoparticles in mortar properties, but they were made at a given temperature. However, are the effects of this addition independent of curing temperature? The present research focused on the influence of TiO2 nanoparticles at three curing temperatures: 5 °C, 20 °C and 45 °C. Four different mortar mixtures were investigated: a reference mortar (without nanomaterial) and three mortars with different percentages of TiO2 (0.25%, 0.5% and 1%) by the total amount of cement for the reference mortar. For each curing temperature, the effect of TiO2 on (i) compressive and flexural strength at 7 days, (ii) calcium hydroxide (CH) formation at 1, 3 at 7 days and (iii) pore structure have been studied. The effect of TiO2 on compressive and flexural strength depends strongly on curing temperature: the higher the curing temperature, the lower the positive effect of TiO2. If this fact is not considered when curing temperature is higher than the standard (20 °C), improvements due to TiO2 substitution would not be as considerable as it is expected. TiO2 promotes CH carbonation during sample preparation. Results suggest that promotion of hydration is not the only effect of TiO2, which can contribute to enhance strength. A potential mechanism of these nanoparticles to enhance strength could be the modification of pore structure; according to 3D X-Ray microscope results, at 20 °C, TiO2 makes pores smaller, more homogeneous and spherical.},

keywords = {Calcium hydroxide, Curing temperature, Mortar, Pore structure, Strength, Titanium dioxide nanoparticles},

pubstate = {published},

tppubtype = {article}

}

@article{otero-chans_experimental_2018,

title = {Experimental analysis of glued-in steel plates used as shear connectors in Timber-Concrete-Composites},

author = {Dolores Otero-Chans and Javier Estévez-Cimadevila and Félix Suárez-Riestra and Emilio Martín-Gutiérrez},

url = {https://www.sciencedirect.com/science/article/pii/S0141029617340117},

doi = {10.1016/j.engstruct.2018.05.062},

issn = {0141-0296},

year  = {2018},

date = {2018-09-01},

urldate = {2026-08-04},

journal = {Engineering Structures},

volume = {170},

pages = {1–10},

abstract = {This paper describes experimental research into timber-concrete composite (TCC) connections made with discrete perforated steel plates glued in timber with epoxy adhesive. Continuous steel meshes have proven to be very strong and rigid elements in TCC structural members. This paper studies the strength and stiffness of these connectors when used in a discrete way, alone and in combination with reinforcing bars. Six types of connector were subjected to experimental tests, analysing two connection lengths and three configuration systems of the connector elements (in which bars are added longitudinally or transversally). The experimental results show that the connections made with discrete steel meshes are very strong and rigid, and that it is possible to design them for ductile failure. Comparison of the results for plates of different lengths indicates that failure occurs in the longest connections in the wood at lower average shear stresses. No significant behavioural differences were detected between connectors made only of plate and those that were reinforced with additional bars. The high slip moduli values indicate that it would be possible to design structural elements with a composite action close to 100% using this type of connection.},

keywords = {Discrete connection, Failure test, Fibre reinforced concrete, Glued connection, Glued laminated timber, Slip moduli, Stiffness, Strength, Timber-concrete composite},

pubstate = {published},

tppubtype = {article}

}