Publicacións

@article{Rojo-López2024,

title = {Genetic programming to understand the influence of new sustainable powder materials in the fresh performance of cement pastes},

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

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189693470&doi=10.1016%2fj.jobe.2024.109186&partnerID=40&md5=82b0d972a8049ef5dccd64581bae8dd4},

doi = {10.1016/j.jobe.2024.109186},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {Journal of Building Engineering},

volume = {88},

abstract = {This study focused on pastes that incorporate metakaolin, biomass ash, and granite powder as supplementary cementitious materials to obtain specific expressions to predict rheological properties in pastes and to define the most appropriate dosage parameters using genetic programming. For this purpose, a dataset was developed following a central composite design, and some fresh properties were measured: Marsh cone and rheological properties, such as yield stress and plastic viscosity. The models generated by genetic programming presented robust statistical indices for the properties studied. The influence of supplementary cementitious materials on rheological properties was also analysed through a parametric analysis. After analysing the factors affecting paste rheology, it was concluded that the most important aspects affecting fresh behaviour were water demand and particle interaction, as well as the relation between both effects. © 2024 The Author(s)},

note = {Cited by: 0; All Open Access, Green Open Access, Hybrid Gold Open Access},

keywords = {Biomass ashes, Cement paste, Cements, Fresh performance, Genetic algorithms, Genetic programming, Granite, Granite powder, Metakaolins, Parametric analysis, Performance of cement, Powder material, Rheological property, Rheology, Supplementary cementitious material, Yield stress},

pubstate = {published},

tppubtype = {article}

}

@article{Rojo-López2022,

title = {Rheology, durability, and mechanical performance of sustainable self-compacting concrete with metakaolin and limestone filler},

author = {Gemma Rojo-López and Belén González-Fonteboa and Fernando Martínez-Abella and Iris González-Taboada},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85134035376&doi=10.1016%2fj.cscm.2022.e01143&partnerID=40&md5=0f8f839bbe6aa5f1c5456f95d4cae965},

doi = {10.1016/j.cscm.2022.e01143},

year  = {2022},

date = {2022-01-01},

urldate = {2022-01-01},

journal = {Case Studies in Construction Materials},

volume = {17},

publisher = {Elsevier Ltd},

abstract = {This study analyzed the performance of self-compacting concrete with a paste composition that includes limestone filler and metakaolin replacing cement to design binary (75% cement and 25% limestone filler) and ternary binders (60% cement, 25% limestone filler and 15% metakaolin). Furthermore, to analyze the effect of the solid volume fraction (volume of sand and coarse aggregate) on concrete rheology, the concretes were designed using four volumes of paste (350 l, 400 l, 450 l and 500 l). Rheological tests were performed at three resting times to measure the viscosity and yield stress over time. The results indicated that the viscosity decreased by 43.3% when the cement was replaced by limestone filler and increased by 73.1% when the cement was replaced by 15% metakaolin while maintaining the limestone filler. These values were obtained as 27.6% and 62.2%, respectively, when the yield stress was analyzed. In addition, the hardened properties (mechanical behavior and durability) were studied by measuring the strengths at 28 days, as well as the electrical resistivity and ultrasonic pulse velocity over time. In this case, at 28 days the use of binary binder reduces the strength and resistivity (about 20%) and the employment of ternary binder reduces strength (15%) while increases the resistivity up to the double (when compared to the 100 C concrete). Moreover, to measure the efficiency of the concrete, a material index was designed that considers the fresh behavior, mechanical performance, durability, cost, and environmental impact. Self-compacting concretes with ternary binders provided the highest indices. The use of alternative materials, particularly metakaolin has been proven to be a good option to enhance concrete sustainable performance. © 2022 The Authors},

note = {Cited by: 40; All Open Access, Gold Open Access, Green Open Access},

keywords = {Aggregates, Binders, Biocompatibility, Cements, Durability, Durability performance, Efficiency, Elasticity, Environmental impact, Fillers, Life cycle, Light velocity, Lime, Limestone, Limestone filler, Material efficiency, Mechanical performance, Metakaolins, Plastic viscosity, Resistivity, Self compacting concrete, Supplementary cementitious material, Ultrasonic pulse velocity, Viscosity, Yield stress},

pubstate = {published},

tppubtype = {article}

}

@article{González-Fonteboa2017,

title = {Comparison of ground bottom ash and limestone as additions in blended cements},

author = {Belén González-Fonteboa and Diego Carro-López and Jorge de Brito and Fernando Martínez-Abella and Sindy Seara-Paz and Salvador Gutiérrez-Mainar},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84990841344&doi=10.1617%2fs11527-016-0954-x&partnerID=40&md5=1b9e199ee47e4b97dad2874f8db6282f},

doi = {10.1617/s11527-016-0954-x},

issn = {13595997},

year  = {2017},

date = {2017-01-01},

urldate = {2017-01-01},

journal = {Materials and Structures/Materiaux et Constructions},

volume = {50},

number = {1},

publisher = {Kluwer Academic Publishers},

abstract = {The number of fluidized bed power plants is growing rapidly due to economic and environmental benefits. These facilities produce larger quantities of bottom ash than conventional boilers. This ash exhibits pozzolanic activity once ground, but due to regulation limitations this by-product is nowadays destined to landfill. Blended cements are the most common cements in Europe and their consumption is continuously growing due to the reduction of environmental impact they allow. In this work, ground bottom ash (GBA) is characterized to determine whether it is suitable for blended cements’ production. This GBA was used in ratios of 10, 20 and 40 % as cement replacement. At the same time, it was compared with type I cement without additions and also with the second most used addition in blended cements: limestone. The cements with GBA showed acceptable performance to produce general purpose cements in the frame of present regulations, reaching 52.5 MPa at 28 days for 10 % of substitution. When compared with limestone, the cements with GBA presented higher compressive strength, better durability and a slight reduction in workability. At the same time, GBA led to higher clinker reductions, thus directly causing lower environmental impacts, and also indirect benefits from the prevention of the disposal in landfill of this bottom ash from fluidized-bed boilers. © 2016, RILEM.},

note = {cited By 14},

keywords = {Acceptable performance; Blended cement; Bottom ash; Disposal in landfills; Economic and environmental benefits; Fluidized bed boilers; Pozzolanic activity; Water penetration depths, Ash handling; Ashes; Boilers; Compressive strength; Environmental impact; Fluidized bed combustion; Fluidized beds; Land fill; Limestone, Cements},

pubstate = {published},

tppubtype = {article}

}