Publicacións

@article{rodriguez-alvaro_wood_2022,

title = {Wood ash versus expanded clay aggregate as internal curing water reservoirs in high performance concrete},

author = {Roberto Rodríguez-Álvaro and Belén González-Fonteboa and Sindy Seara-Paz and Antonio José Tenza-Abril},

url = {https://doi.org/10.1617/s11527-022-01963-3},

doi = {10.1617/s11527-022-01963-3},

issn = {1871-6873},

year  = {2022},

date = {2022-04-01},

urldate = {2026-08-10},

journal = {Materials and Structures},

volume = {55},

number = {4},

pages = {118},

abstract = {The performances of expanded clay aggregate and wood ash as internal curing water reservoirs were studied in the mortar phase of a hypothetical high performance concrete with a low water-to-binder ratio. The two materials substituted the 15 and 30% of the sand volume. Two different binders, Portland cement and high-volume fly ash blended cement, were used. The compressive strength and the volume stability of the mortars in sealed and air-drying conditions were studied. Furthermore, the desorption capacity of the internal curing water reservoirs and the internal humidity inside the mortars during the first days after casting were analysed. The results shown that the reduction in the self-desiccation shrinkage was higher when the expanded clay aggregate was used, even in air-drying curing conditions, due to its higher desorption capacity in low-relative-humidity environments in comparison to that of the wood ash. However, wood ash had a stronger beneficial effect on early age autogenous shrinkage without significantly increasing the drying shrinkage. The two alternative aggregates influenced the strength moderately. Considering the technical, economic, and environmental implications of using the two lightweight aggregates, wood ash is recommended.},

keywords = {By-product, Circular economy, Curing sensitivity, Internal curing agent, Residues},

pubstate = {published},

tppubtype = {article}

}

@article{Rojo-López2020,

title = {Quaternary blends of portland cement, metakaolin, biomass ash and granite powder for production of self-compacting concrete},

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

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084552139&doi=10.1016%2fj.jclepro.2020.121666&partnerID=40&md5=432f2c1cfd49358288f98b4f03788f9d},

doi = {10.1016/j.jclepro.2020.121666},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

journal = {Journal of Cleaner Production},

volume = {266},

publisher = {Elsevier Ltd},

abstract = {Given the rising societal pressure towards sustainable waste management and resource efficiency, in a more circular economy, an increased use and diversification of supplementary cementitious materials (SCM) will be necessary to achieve the CO2 mitigation goals. The current study addresses the development of self-compacting concrete, replacing part of the cement (the primary source of CO2 emissions) by metakaolin and wastes derived from two industrial sectors operating in the “Galicia–North of Portugal Euroregion”: wood manufacturing and natural stone quarrying. A study was carried out at the mortar level to investigate the effect of the mix design variables on several engineering properties of the self-compacting concrete. Statistically designed experiments reveal that an increase in water/powder volume ratio has a dominant effect on the fresh state properties, whereas the water/cement weight ratio has a dominant effect on the hardened state properties. A like-for-like comparison of the proposed quaternary blends and previously studied binary/ternary blends indicates that these mixtures exhibit improved self-compacting ability, greater compressive strength, and can offer interesting opportunities to reduce the unit cost and environmental impact of self-compacting concrete per m3. Four different mortar mixtures were optimised to achieve excellent self-compacting ability yet with distinct compressive strength levels at 28 days (65, 70, 75, and 80 MPa). A single measure of the material efficiency is proposed herein to reflect the engineering properties improvement (workability, compressive strength, and durability) over its economic (unit cost) and environmental impact. © 2020 Elsevier Ltd},

note = {Cited by: 47; All Open Access, Green Open Access},

keywords = {Binary mixtures, Carbon dioxide, Cement industry, Circular economy, Compressive strength, Concrete industry, Concrete mixtures, Concrete products, Cost engineering, Designed experiments, Efficiency, Engineering properties, Industrial emissions, Industrial sector, Material efficiency, Mortar, Portland cement, Resource efficiencies, Self compacting concrete, Supplementary cementitious material, Sustainable waste management, Waste management},

pubstate = {published},

tppubtype = {article}

}