Publicacións

@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{Puertas201822,

title = {Alkali-activated slag concrete: Fresh and hardened behaviour},

author = {Francisca Puertas and Belén González-Fonteboa and Iris González-Taboada and María M. Alonso López and Manuel Torres-Carrasco and Gemma Rojo-López and Fernando Martínez-Abella},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85030679824&doi=10.1016%2fj.cemconcomp.2017.10.003&partnerID=40&md5=55e3f2fd798b6078f508e2db2e4c24b7},

doi = {10.1016/j.cemconcomp.2017.10.003},

year  = {2018},

date = {2018-01-01},

urldate = {2018-01-01},

journal = {Cement and Concrete Composites},

volume = {85},

pages = {22 – 31},

publisher = {Elsevier Ltd},

abstract = {The behaviour of fresh and hardened alkali-activated slag (AAS) and OPC concretes was compared and the effect of mixing time assessed. OPC and AAS concrete slump and rheological results proved to differ, particularly when the slag was activated with waterglass (WG). The nature of the alkaline activator was the key determinant in AAS concrete rheology. Bingham models afforded a good fit to all the OPC and AAS concretes. In OPC and NaOH-activated AAS concretes, longer mixing had an adverse effect on rheology while improving hardened performance only slightly. In WG-AAS concrete, longer mixing times, improved mechanical properties and also rheological behaviour was enhanced, in which those conditions were required to break down the microstructure. Longer mixing raised thixotropy in OPC and NaOH-activated AAS concretes, but lowered the value of this parameter in waterglass-activated slag concrete. © 2017 Elsevier Ltd},

note = {Cited by: 201; All Open Access, Green Open Access},

keywords = {Alkali activated slags, Alkali-activated slag concretes, Alkaline activation, Alkaline activators, Atomic absorption spectrometry, Bingham model, Bins, Blast furnaces, Concrete mixing, Concretes, Elasticity, Hardened behaviour, Hardening, Key determinants, Mixing, Rheological behaviour, Rheology, Slags},

pubstate = {published},

tppubtype = {article}

}

@article{González-Taboada20171,

title = {Tools for the study of self-compacting recycled concrete fresh behaviour: Workability and rheology},

author = {Iris González-Taboada and Belén González-Fonteboa and Javier Eiras-López and Gemma Rojo-López},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019157098&doi=10.1016%2fj.jclepro.2017.04.045&partnerID=40&md5=dc483461bc80b8981beee59d6b2ab36b},

doi = {10.1016/j.jclepro.2017.04.045},

year  = {2017},

date = {2017-01-01},

urldate = {2017-01-01},

journal = {Journal of Cleaner Production},

volume = {156},

pages = {1 – 18},

abstract = {This work studies the fresh behaviour of self-compacting recycled concrete (SCRC) with different replacement percentages of recycled concrete coarse aggregate (20, 50 and 100%). To control the high absorption of recycled aggregate, three different mixing methods are also used in each studied concrete: M1 (dry aggregate and extra water), M2 (pre-soaked aggregate) and M3 (aggregate with a 3% of natural moisture and extra water). The fresh-state properties are measured with empirical and rheological tests, both carried out at 15, 45 and 90 min from the water-cement contact. Results obtained lead to conclude that rheology is the best tool to control fresh state behaviour of SCRC mixes and that Bingham 5-lowest is the suitable model to describe their rheological behaviour. Additionally, it has been concluded that the best method to produce SCRC is to compensate the recycled aggregate absorption during mixing using an extra quantity of water. With this method, self-compacting behaviour can be maintained with all replacement percentages until 45 min, and even until 90 min when the replacement ratio does not exceed 50%. Moreover, the use of the recycled coarse aggregate with a previous moisture content involves a greater difficulty to control workability and rheology than its use in dry-state condition. © 2017 Elsevier Ltd},

note = {Cited by: 88},

keywords = {Aggregates, Concrete mixing, Concretes, Elasticity, Fresh behaviour, Mechanical properties, Mixing, Moisture, Recycled aggregates, Recycled coarse aggregate, Recycled concrete coarse aggregate, Recycled concretes, Recycling, Replacement ratio, Rheological behaviour, Rheology, Self compacting concrete, Water absorption, Workability},

pubstate = {published},

tppubtype = {article}

}