Effect of spiral blade geometry on 3D-printed concrete rheological properties and extrudability using discrete element modeling

Peng, Zhi; Wu, Yue; Yang, Qianfan; Kong, Xiangrui

doi:10.1016/j.autcon.2022.104199

Cited by 24 publications

(1 citation statement)

References 43 publications

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“…Previous studies [ 80 , 81 , 82 ] also gave a similar explanation and introduced the concept of ‘bridges’. As shown in Figure 8 b, ‘liquid bridges’ can be formed due to the presence of the surface water of RFA.…”

Section: Measurement Methods For W Ssd Of Ramentioning

confidence: 87%

Measurement of Water Absorption of Recycled Aggregate

Duan

Zhao

et al. 2022

Materials

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Owing to the high absorption capacity of recycled aggregate (RA), it is crucial to accurately measure its saturated-surface-dried water absorption (WSSD), which largely affects an effective water-to-binder ratio of recycled aggregate concrete. In this study, existing measurement methods for the WSSD of RA are extensively reviewed, including Wiping, Slumping, Centrifugation, Infrared, Evaporation, Airflow drying, Conductivity, Pycnometer, Hydrostatic balance, and Extrapolation. In particular, the physical principles and operability of these methods are emphasized. It was determined that the accuracy of all test results was not satisfactory. For example, the water in pores with an open-ended direction that was opposite to the centrifugal force could largely be retained. In Airflow drying, the temperature change was significantly delayed. In addition, in Hydrostatic balance, RA would pre-absorb water before determining the initial reading. Therefore, several suggestions for optimizing these methods are presented, such as the combination of Evaporation and Airflow drying, the liquid selection in Hydrostatic balance, and the addition of a tiny mixer in each centrifuge tube. In summary, this review facilitates the development of an accurate and convenient method for measuring the WSSD of RA.

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Section: Measurement Methods For W Ssd Of Ramentioning

confidence: 87%