TY - GEN
T1 - Development of a Framework to Provide Concrete with a Low Carbon Footprint and Enhanced Resistance Against ASR-Induced Development
AU - De Souza, Diego Jesus
AU - Heisig, Anne
AU - Machner, Alisa
AU - Kunther, Wolfgang
AU - Sanchez, Leandro
PY - 2023
Y1 - 2023
N2 - The concrete industry needs to find cost-effective technologies to reduce the carbon footprint of its products. At the same time, these technologies should not reduce the concrete performance, including long-term durability. The great demand for concrete and the expected shortages of high-quality aggregates (e.g., ASR resistant) in the coming years will enhance the probability of using inferior raw materials that will reduce the lifespan of concrete infrastructures. This study aims to develop a new approach taking the chemical composition of the binder into account for the concrete mix-design toward the mitigation of ASR, while reducing the carbon footprint and cost of concrete. In this work, blended cements that fall into the “safe” combination of CaO, SiO2, and Al2O3 (main oxides in cementitious materials) with regard to ASR were tested for their mechanical properties and resistance to expansion upon ASR. The data gathered demonstrate promising results on using the proposed ternary oxides approach: by comparing the effect of the different portions of Al2O3, SiO2, and CaO it was demonstrated that the higher the content of either Al2O3, SiO2, or both, the lower ASR-induced expansion development. Yet, keeping the amount of CaO constant, the results suggest that mixtures with a higher amount of SiO2 than Al2O3 tend to be more efficient in mitigating ASR. The results provide interesting data to help in the decision making to select the best options (i.e., the combination of different SCMs and their quantities) to apply in concrete structures exposed to ASR development.
AB - The concrete industry needs to find cost-effective technologies to reduce the carbon footprint of its products. At the same time, these technologies should not reduce the concrete performance, including long-term durability. The great demand for concrete and the expected shortages of high-quality aggregates (e.g., ASR resistant) in the coming years will enhance the probability of using inferior raw materials that will reduce the lifespan of concrete infrastructures. This study aims to develop a new approach taking the chemical composition of the binder into account for the concrete mix-design toward the mitigation of ASR, while reducing the carbon footprint and cost of concrete. In this work, blended cements that fall into the “safe” combination of CaO, SiO2, and Al2O3 (main oxides in cementitious materials) with regard to ASR were tested for their mechanical properties and resistance to expansion upon ASR. The data gathered demonstrate promising results on using the proposed ternary oxides approach: by comparing the effect of the different portions of Al2O3, SiO2, and CaO it was demonstrated that the higher the content of either Al2O3, SiO2, or both, the lower ASR-induced expansion development. Yet, keeping the amount of CaO constant, the results suggest that mixtures with a higher amount of SiO2 than Al2O3 tend to be more efficient in mitigating ASR. The results provide interesting data to help in the decision making to select the best options (i.e., the combination of different SCMs and their quantities) to apply in concrete structures exposed to ASR development.
KW - Alkali-silica reaction
KW - Durability of concrete
KW - Assessment of ASR-induced expansion
KW - Preventive measures
U2 - 10.1007/978-3-031-33187-9_72
DO - 10.1007/978-3-031-33187-9_72
M3 - Article in proceedings
VL - 2
T3 - RILEM Bookseries
SP - 784
EP - 795
BT - Proceedings of SynerCrete’23
A2 - Jędrzejewska, A.
A2 - Kanavaris, F.
A2 - Azenha, M.
A2 - Benboudjema, F.
A2 - Schlicke, D.
PB - Springer
T2 - SynerCrete 2023
Y2 - 14 June 2023 through 16 June 2023
ER -