Suescum-Morales David, Fernández-Ledesma Enrique, González-Caro Ágata, Merino-Lechuga Antonio Manuel, Fernández-Rodríguez José María, Jiménez José Ramón
Área de Ingeniería de la Construcción, Escuela Politécnica Superior de Belmez, Universidad de Córdoba, 14240 Córdoba, Spain.
Área de Química Inorgánica, Escuela Politécnica Superior de Belmez, Universidad de Córdoba, 14240 Córdoba, Spain.
Materials (Basel). 2023 Mar 18;16(6):2436. doi: 10.3390/ma16062436.
The objective of the present study was to explore three types of vibro-compacted precast concrete mixtures replacing fine and coarse gravel with a recycled/mixed concrete aggregate (RCA or MCA). The portlandite phase found in RCA and MCA by XRD is a "potential" CO sink. CO curing improved the compressive strength in all the mixtures studied. One tonne of the mixtures studied could be decarbonised after only 7 days of curing 13,604, 36,077 and 24,635 m of air using natural aggregates, RCA or MCA, respectively. The compressive strength obtained, XRD, TGA/DTA and carbon emission evaluation showed that curing longer than 7 days in CO was pointless. The total CO emissions by a mixture using CO curing at 7 days were 221.26, 204.38 and 210.05 kg CO eq/m air using natural aggregates, RCA or MCA, respectively. The findings of this study provide a valuable contribution to carbon emission evaluation of CO curing in vibro-compacted precast concrete with recycled/mixed concrete aggregates (RCA or MCA). The technology proposed in this research facilitates carbon capture and use and guarantees enhanced compressive strength of the concrete samples.
本研究的目的是探索三种用再生/混合混凝土骨料(RCA或MCA)替代细骨料和粗骨料的振动压实预制混凝土混合物。通过XRD在RCA和MCA中发现的波特兰石相是一个“潜在”的碳汇。二氧化碳养护提高了所有研究混合物的抗压强度。研究的混合物中,使用天然骨料、RCA或MCA分别在养护7天后,每1吨混合物可分别脱除13,604、36,077和24,635立方米空气中的碳。所获得的抗压强度、XRD、TGA/DTA和碳排放评估表明,在二氧化碳中养护超过7天是没有意义的。使用二氧化碳养护7天的混合物的总二氧化碳排放量分别为,使用天然骨料、RCA或MCA时,每立方米空气分别为221.26、204.38和210.05千克二氧化碳当量。本研究结果为使用再生/混合混凝土骨料(RCA或MCA)的振动压实预制混凝土中二氧化碳养护的碳排放评估提供了有价值的贡献。本研究提出的技术有助于碳捕获和利用,并保证提高混凝土样品的抗压强度。