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Enhancement in stability of air bubbles in mortar at fresh state with different SCMs
https://orcid.org/http://orcid.org/0000-0001-7458-8407
The stability of air bubbles is a critical factor in determining the performance of concrete. This study investigated the influence of various supplementary cementing materials (SCMs), with a 20% replacement of cement by weight, on the stability of foam in solutions and air bubbles in fresh mortars. Air bubble size distributions were measured using an air void analyzer and X-ray computed tomography at two intervals: from 5 to 60 min and from 60 to 180 min after the mixture was prepared. The results demonstrated that the number of small bubbles decreased while the number of large bubbles increased over time, with the most significant changes occurring within the initial 60 min. The results of the wettability tests were combined with those from the X-ray diffraction (XRD) analysis to identify a correlation between the stability of air bubbles and the wetting angle of the SCMs. It was observed that the contact angle of the SCMs approached 90° in cases where the air bubbles exhibited increased stability. The XRD patterns revealed significant differences in the mineral compositions between the bubble shells and the screened pastes from fresh mortar. The presence of a higher concentration of SCMs and hydration products on the bubble shells, compared to the paste, was identified as a potential reason for the observed differences in bubble stability. The utilization of specific SCMs has the potential to enhance bubble stability, in addition to the use of chemical admixtures.
Enhancement in stability of air bubbles in mortar at fresh state with different SCMs
https://orcid.org/http://orcid.org/0000-0001-7458-8407
The stability of air bubbles is a critical factor in determining the performance of concrete. This study investigated the influence of various supplementary cementing materials (SCMs), with a 20% replacement of cement by weight, on the stability of foam in solutions and air bubbles in fresh mortars. Air bubble size distributions were measured using an air void analyzer and X-ray computed tomography at two intervals: from 5 to 60 min and from 60 to 180 min after the mixture was prepared. The results demonstrated that the number of small bubbles decreased while the number of large bubbles increased over time, with the most significant changes occurring within the initial 60 min. The results of the wettability tests were combined with those from the X-ray diffraction (XRD) analysis to identify a correlation between the stability of air bubbles and the wetting angle of the SCMs. It was observed that the contact angle of the SCMs approached 90° in cases where the air bubbles exhibited increased stability. The XRD patterns revealed significant differences in the mineral compositions between the bubble shells and the screened pastes from fresh mortar. The presence of a higher concentration of SCMs and hydration products on the bubble shells, compared to the paste, was identified as a potential reason for the observed differences in bubble stability. The utilization of specific SCMs has the potential to enhance bubble stability, in addition to the use of chemical admixtures.
Enhancement in stability of air bubbles in mortar at fresh state with different SCMs
https://orcid.org/http://orcid.org/0000-0001-7458-8407
The stability of air bubbles is a critical factor in determining the performance of concrete. This study investigated the influence of various supplementary cementing materials (SCMs), with a 20% replacement of cement by weight, on the stability of foam in solutions and air bubbles in fresh mortars. Air bubble size distributions were measured using an air void analyzer and X-ray computed tomography at two intervals: from 5 to 60 min and from 60 to 180 min after the mixture was prepared. The results demonstrated that the number of small bubbles decreased while the number of large bubbles increased over time, with the most significant changes occurring within the initial 60 min. The results of the wettability tests were combined with those from the X-ray diffraction (XRD) analysis to identify a correlation between the stability of air bubbles and the wetting angle of the SCMs. It was observed that the contact angle of the SCMs approached 90° in cases where the air bubbles exhibited increased stability. The XRD patterns revealed significant differences in the mineral compositions between the bubble shells and the screened pastes from fresh mortar. The presence of a higher concentration of SCMs and hydration products on the bubble shells, compared to the paste, was identified as a potential reason for the observed differences in bubble stability. The utilization of specific SCMs has the potential to enhance bubble stability, in addition to the use of chemical admixtures.
Enhancement in stability of air bubbles in mortar at fresh state with different SCMs
Mater Struct
Jiang, Qian (Autor:in) / Yu, Cheng (Autor:in) / Zhang, Qian (Autor:in)
01.02.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Air bubble , Stability , Fresh mortar , SCMs , Air bubble shell , Mineral compositions Chemical Sciences , Physical Chemistry (incl. Structural) , Engineering , Solid Mechanics , Materials Science, general , Theoretical and Applied Mechanics , Manufacturing, Machines, Tools, Processes , Civil Engineering , Building Materials
Enhancement in stability of air bubbles in mortar at fresh state with different SCMs
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