Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thixotropy and interlayer bond strength of self-compacting recycled concrete
Versión aceptada de https://doi.org/10.1016/j.conbuildmat.2017.11.157 ; [Abstract:] This work is focused on assessing the thixotropy of self-compacting recycled concrete (SCRC) and on evaluating the interlayer bond strength. To do so, four SCRC mixes with 0%, 20%, 50%, and 100% of recycled coarse aggregate (by volume) were studied. This aggregate was used in dry-state conditions and an extra quantity of water was added during mixing in order to compensate its absorption. Three testing methods were used to assess the degree of thixotropy of SCRC: structural breakdown curves at various rotational speeds, hysteresis loop flow curves and yield stress at rest. To evaluate the effect of the structural build-up at rest on SCRC interlayer bond strength, two methods were used: flexural tests and water permeability tests. The results indicate that the increase of thixotropy and interlayer bond strength with the replacement percentage is due to the difference in the effective w/c ratio, result of the non–compensated water absorption, to the higher amount of fines in the recycled aggregates and generated from the old adhered mortar and also to the higher internal friction of recycled aggregates. Moreover, as water absorption is compensated in the mixing protocol, changes over time in the effective w/c ratio are negligible. Therefore, the thixotropic changing rate is similar in all studied mixes. ; The study is part of three projects entitled: (a) “Robust self-compacting recycled concretes: rheology in fresh state and mechanical properties” (Ref: BIA2014-58063-R)” funded by MINECO; (b) “Valorisation of thermal coal ashes throughout the development of materials and products in the field of the civil engineering and building eco-construction (CENICIENTA)”; (c) “Design of Eco-products made with cement-base materials. Application to inside building furniture (DECOCEM)”. This work was also possible by the financial support of a pre-doctoral grant of Xunta de Galicia (Spain), including the INDITEX-UDC 2015 grant for international ...
Thixotropy and interlayer bond strength of self-compacting recycled concrete
Versión aceptada de https://doi.org/10.1016/j.conbuildmat.2017.11.157 ; [Abstract:] This work is focused on assessing the thixotropy of self-compacting recycled concrete (SCRC) and on evaluating the interlayer bond strength. To do so, four SCRC mixes with 0%, 20%, 50%, and 100% of recycled coarse aggregate (by volume) were studied. This aggregate was used in dry-state conditions and an extra quantity of water was added during mixing in order to compensate its absorption. Three testing methods were used to assess the degree of thixotropy of SCRC: structural breakdown curves at various rotational speeds, hysteresis loop flow curves and yield stress at rest. To evaluate the effect of the structural build-up at rest on SCRC interlayer bond strength, two methods were used: flexural tests and water permeability tests. The results indicate that the increase of thixotropy and interlayer bond strength with the replacement percentage is due to the difference in the effective w/c ratio, result of the non–compensated water absorption, to the higher amount of fines in the recycled aggregates and generated from the old adhered mortar and also to the higher internal friction of recycled aggregates. Moreover, as water absorption is compensated in the mixing protocol, changes over time in the effective w/c ratio are negligible. Therefore, the thixotropic changing rate is similar in all studied mixes. ; The study is part of three projects entitled: (a) “Robust self-compacting recycled concretes: rheology in fresh state and mechanical properties” (Ref: BIA2014-58063-R)” funded by MINECO; (b) “Valorisation of thermal coal ashes throughout the development of materials and products in the field of the civil engineering and building eco-construction (CENICIENTA)”; (c) “Design of Eco-products made with cement-base materials. Application to inside building furniture (DECOCEM)”. This work was also possible by the financial support of a pre-doctoral grant of Xunta de Galicia (Spain), including the INDITEX-UDC 2015 grant for international ...
Thixotropy and interlayer bond strength of self-compacting recycled concrete
González-Taboada, Iris (Autor:in) / González-Fonteboa, Belén (Autor:in) / Martínez-Abella, Fernando (Autor:in) / Seara Paz, Sindy (Autor:in)
01.01.2018
doi:10.1016/j.conbuildmat.2017.11.157
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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