Publicacións

@article{cantero_optimisation_2024,

title = {Optimisation of the performance of alkali-activated mortars using CDW binders from different sources},

author = {Blas Cantero-Chaparro and Renato Neves and Lucas Sequeira and Jorge Brito and Miguel Bravo},

url = {https://www.sciencedirect.com/science/article/pii/S0950061824028198},

doi = {10.1016/j.conbuildmat.2024.137677},

issn = {0950-0618},

year  = {2024},

date = {2024-09-01},

urldate = {2026-04-28},

journal = {Construction and Building Materials},

volume = {442},

pages = {137677},

abstract = {This study investigates the fresh-state properties and the hardened-state physical and mechanical properties of a total of 64 alkali-activated mortars incorporating different wastes as binders, such as fly ash (FA), recycled concrete (RC), recycled brick (RB), and recycled tile (RT). These waste materials were activated using sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). Linear regression analysis was employed to evaluate the impact and significance of Na2O concentration (9 % or 15 %), modulus of silica (0.5 or 1), curing time in the oven (24 or 48 h), and temperature (50 °C or 70 °C) on the properties of the mortars. The results, analysed using ANOVA, indicate that all properties were affected by these parameters, except for the initial curing time in the oven for mortars made with construction and demolition waste (CDW), which showed no significant differences between periods of 24 and 48 h. Compared to mortars produced with RC, the contribution of these parameters to mechanical properties was more prominent in the mixes with RT and RB. The highest compressive strength at 28 days, for the mortars with CDW binders, was obtained by incorporating RT with 12 % of Na2O, modulus of silica of 1 and 70 °C for 48 h of initial curing, reaching 12.5 MPa. This value is 2.1 times higher than the strength obtained in mixes with RB or RC. The results also show that the performance of the mortars is highly related to the reactivity of the waste material (mortars with RT performed better) and prove that each raw material has its own optimum criterion.},

keywords = {Alkali activator, Construction and demolition waste, Geopolymer, Mechanical properties, Physical properties},

pubstate = {published},

tppubtype = {article}

}

@article{ghorbel_effect_2023,

title = {Effect of 10% recycled sands from various storage sites on the mortar’s properties},

author = {Elhem Ghorbel and George Wardeh and Belén González-Fonteboa},

url = {https://doi.org/10.1080/19648189.2023.2169766},

doi = {10.1080/19648189.2023.2169766},

issn = {1964-8189},

year  = {2023},

date = {2023-10-01},

urldate = {2026-08-13},

journal = {European Journal of Environmental and Civil Engineering},

volume = {27},

number = {14},

pages = {4067–4085},

publisher = {Taylor & Francis},

abstract = {This study investigates the effects of using 10% of recycled sand in mortars. Using the concrete equivalent mortar approach, the reference mortar was developed from a flowable natural aggregate concrete with a C35/45 strength class. Five mortars were manufactured by replacing 10% of the natural sand with recycled sand from various recycling platforms while keeping the formulation parameters constant. The fresh state results showed that recycled mortar had an increased air content, which increased yield stress and viscosity. In addition, mortars containing 10% recycled sand showed a faster rate of flow loss over time. There was no difference between the materials in the hardening state with regard to the evolution of the hydration heat or the setting time. The relationship between the qualities of mortars and sands revealed that the air content depends on the sand’s fineness and the presence of fines with a diameter less than 63 µm. A relatively small increase in porosity and water absorption capacity was observed with a decrease in the compressive and flexural strength with no obvious change in the elastic modulus. The total shrinkage was revealed to depend on the fines content and decreases when the fines content increases.},

keywords = {Mechanical properties, Mortar, Physical properties, Recycled sand, Workability},

pubstate = {published},

tppubtype = {article}

}