Publicacións

@article{rojo-lopez_parametric_2023,

title = {Parametric analysis in sustainable self-compacting mortars using genetic programming},

author = {Gemma Rojo-López and Belén González-Fonteboa and Juan Luis Pérez-Ordóñez and Fernando Martínez-Abella},

url = {https://www.sciencedirect.com/science/article/pii/S0950061823029069},

doi = {10.1016/j.conbuildmat.2023.133189},

issn = {0950-0618},

year  = {2023},

date = {2023-11-01},

urldate = {2023-11-01},

journal = {Construction and Building Materials},

volume = {404},

pages = {133189},

abstract = {This study addresses the capabilities of genetic programming to predict the behaviour of cement-based mixtures by focusing on the influence of quaternary binders (incorporating metakaolin, biomass ash and granite powder as novel powder materials) on the rheological properties of self-compacting mixtures, including spread diameter in mini-cone test and time to flow in mini-funnel test. Using a previous dataset, GP techniques are applied to obtain predicted models and to compare them with those developed throughout analysis of variance. The results demonstrate that the equations obtained by the GP technique showed the best statistical indices for the analysed properties. Afterwards, a parametric analysis was performed to analyse the influence of the composition of quaternary binders on the fresh behaviour of mortar mixtures. The parametric analysis indicated that changes in the binder composition that increased granite powder content damage the fresh behaviour of the mortars (the funnel time increases, and the spread diameter decreases), being this negative effect more significant when the water content is low, and especially noteworthy in the Tfunnel time. It is concluded that genetic programming and design of experiments are powerful tools that can be used to analyse the influence of new raw materials in different mortar properties.},

keywords = {Biomass ash, Genetic programming, Granite powder, Supplementary cementitious materials},

pubstate = {published},

tppubtype = {article}

}

@article{nduka_effect_2021,

title = {Effect of KyAl4(Si8-y) O20(OH)4 Calcined Based-Clay on the Microstructure and Mechanical Performances of High-Performance Concrete},

author = {David O. Nduka and Babatunde J. Olawuyi and Olabosipo I. Fagbenle and Belén González-Fonteboa},

url = {https://www.mdpi.com/2073-4352/11/10/1152},

doi = {10.3390/cryst11101152},

issn = {2073-4352},

year  = {2021},

date = {2021-10-01},

urldate = {2026-08-06},

journal = {Crystals},

volume = {11},

number = {10},

pages = {1152},

publisher = {Multidisciplinary Digital Publishing Institute},

abstract = {The work described in this paper has been performed to determine the potential use of meta-illite (KyAl4(Si8-y) O20(OH)4) calcined clay (MCC) as a supplementary cementitious material (SCM) in a binary Portland cement (PC) for high-performance concrete (HPC) production. To obtain the properties of the cementitious materials, the chemical composition, mineral phases, morphology, calcination efficiency and physical properties were quantitatively analysed using the advanced techniques of X-ray fluorescence (XRF), scanning electron microscopy/energy dispersive X-ray (SEM/EDX), X-ray diffraction (XRD), Fourier transform infrared/attenuated total reflection (FTIR/ATR), thermogravimetric analysis (TGA), laser particle sizing and Brunauer–Emmett–Teller (BET) nitrogen absorption method. The MCC’s effect on the workability and mechanical properties (compressive, splitting tensile and flexural strengths) and microstructure (morphology and crystalline phases) of hardened MCC-based HPCs were determined. The XRF result shows that the oxide composition of MCC confirmed the pozzolanic material requirements with recorded high useful oxides content. At the same time, the SEM image presents particles of broad, solid masses with a wider surface area of irregular shape. The XRD results show that the MCC was majorly an illite-based clay mineral calcined at a maximum temperature of 650 °C, as revealed by the TGA. The MCC addition increases the slump flow of HPCs at 5–15% cement replacement. The MCC incorporation at 10% cement replacement best improved the porosity of HPCs at a later age resulting in increased mechanical and microstructural properties of tested samples. Therefore, it is recommended that MCC addition within 10% cement replacement be adopted for low W/B Class I HPC at no deleterious results on mechanical and microstructural properties of the concrete.},

keywords = {dehydroxylation, high-performance concrete, meta-illite calcined clay, superabsorbent polymers, superplaticiser, Supplementary cementitious materials},

pubstate = {published},

tppubtype = {article}

}