Papers

@article{bastias_sustainable_2024,

title = {Sustainable Cement Paste Development Using Wheat Straw Ash and Silica Fume Replacement Model},

author = {Bryan Bastías and Marcelo González and Juan Rey-Rey and Guillermo Valerio and Pablo Guindos-Bretones},

url = {https://www.mdpi.com/2071-1050/16/24/11226},

doi = {10.3390/su162411226},

issn = {2071-1050},

year  = {2024},

date = {2024-01-01},

urldate = {2026-08-03},

journal = {Sustainability},

volume = {16},

number = {24},

pages = {11226},

publisher = {Multidisciplinary Digital Publishing Institute},

abstract = {Conventional cement production is a major source of carbon dioxide emissions, which creates a significant environmental challenge. This research addresses the problem of how to reduce the carbon footprint of cement paste production using agricultural and industrial waste by-products, namely wheat straw ash (WSA) and silica fume (SF). Currently, accurate models that can predict the mechanical properties of cement pastes incorporating these waste materials are lacking. To fill this gap, our study proposes a model based on response surface methodology and Box-Behnken design, designed to predict the strength of cement pastes with partial substitutions of WSA and SF. Through mechanical and characterization tests, the model demonstrated high accuracy in predicting the strength of the pastes, validated with three mixes, which showed maximum errors of less than 6% at different ages (7, 28, and 56 days). Response surface analysis revealed that replacing cement with 0–20% WSA and more than 5% SF can effectively reduce the carbon footprint by maximizing waste incorporation. This model allows for the calculation of optimal cement substitution levels based on the required strength, thus promoting sustainability in the construction industry through the use of local waste/resources.},

keywords = {Box-Behnken Design, Cement paste, design of experiment, low carbon, silica fume, Supplementary cementitious material, sustainable concrete, wheat straw ash},

pubstate = {published},

tppubtype = {article}

}

@article{velay-lizancos_effect_2019,

title = {The effect of recycled aggregates on the accuracy of the maturity method on vibrated and self-compacting concretes},

author = {M. Velay-Lizancos and Isabel Martínez-Lage and P. Vazquez-Burgo},

url = {https://www.sciencedirect.com/science/article/pii/S1644966518301316},

doi = {10.1016/j.acme.2018.11.004},

issn = {1644-9665},

year  = {2019},

date = {2019-03-01},

urldate = {2026-08-06},

journal = {Archives of Civil and Mechanical Engineering},

volume = {19},

number = {2},

pages = {311–321},

abstract = {Fine and coarse recycled aggregate used jointly as partial replacement of natural aggregate is not allowed for structural concrete in many international standards. More studies about it are needed toward more ecofriendly standards. This research studies one important aspect for structural concrete: the influence of recycled aggregate on the accuracy of the maturity method. A total of 7 mixes were studied with two types of reference concretes: vibrated (VC) and self-compacting concrete (SSC). For vibrated concrete, we studied 4 mixes with different partial replacements of recycled aggregates: 0%, 8%, 20% and 31%. For self-compacting concrete, the partial replacements were 0%, 20% and 50% of the total amount of aggregates. We found that, for percentages equal or higher than 20%, the higher is the percentage of recycled aggregate, the higher the activation energy. It was observed that a unique curve “Maturity–Relative strength (S/S∞)” can be used for each type of concrete (SSC or VC) independent of the percentage of recycled aggregate. In addition, we found higher accuracy of the estimations using the hyperbolic equation for the curve “Maturity–S/S∞” than using the exponential equation; applying the hyperbolic approach, less than 3% of the estimations had an error higher than 10%.},

keywords = {Activation energy, Maturity method, Recycled aggregate, sustainable concrete, Time–temperature factor},

pubstate = {published},

tppubtype = {article}

}