Vibration of fresh concrete understood through the paradigm of granular physics

Koch, Jeremy; Castaneda, Daniel I.; Ewoldt, Randy H.; Lange, David A.

doi:10.1016/j.cemconres.2018.09.005

Cited by 49 publications

(16 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is clear that the fluidity of OPC is significantly improved by external vibration. One way to explain this phenomenon is to treat the OPC under vibration no longer as Bingham fluid but as granular system, just like the experiment recently put forward by Koch (Koch et al 2019), which is consistent with the granular constitutive model of Hanotin (Hanotin et al 2015). According to this model, the granular system has Bingham-like behavior when it is not under vibration, and has quasi-Newtonian behavior at low shear rates during vibration.…”

Section: Opc Slump Flow Test Under External Vibrationmentioning

confidence: 53%

Pilot Study on Vibrated Rock-filled Concrete

Wang

Feng

Zhou

et al. 2019

ACT

View full text Add to dashboard Cite

This exploratory study investigated a new type of rock-filled concrete (RFC) named vibrated rock-filled concrete (VRFC). Different from the self-compacting concrete (SCC) used in traditional type of RFC, VRFC was built with ordinary pumping concrete (OPC) with the help of external vibration. The application of OPC further reduced the cement dosage and hydration heat of RFC, making it more widely applicable and environment-friendly without cost increase. It was proved that the fluidity of OPC could be significantly improved by external vibration, and the relationship between the flowing process and the mix proportion of OPC was also analyzed in the laboratory experiment. After verifying the feasibility of filling the rock voids with OPC in the laboratory, more than 700 m 3 VRFC was constructed in the on-site experiment with roller compactors as the vibration source. Panoramic borehole color TV system and ultrasonic testing method were used to evaluate the quality of VRFC, and the influences of different parameters on the compactness as well as mechanical performance of VRFC were also analyzed.

show abstract

Section: Opc Slump Flow Test Under External Vibrationmentioning

confidence: 53%

Pilot Study on Vibrated Rock-filled Concrete

Wang

Feng

Zhou

et al. 2019

ACT

View full text Add to dashboard Cite

show abstract

“…In Section 4.2 we did not observe any significant displacement of bubbles driven into oscillations at location A, where they are subject only to the buoyancy force. Next we test the effect of acoustic radiation forces [eqn (11)] on bubble displacement, by looking at bubbles positioned at location B where they are subject also to acoustic pressure gradients. Fig.…”

Section: Response To Acoustic Radiation Forcesmentioning

confidence: 99%

“…Removing bubbles below the critical size can be achieved by centrifuging, 10 applying a vacuum, or by using low-frequency (B100 Hz) vibrations to suppress the yield stress in fragile granular networks. 11 These techniques alter the physical parameters at play in the definition of Y c À1 rather than fundamentally altering this criterion. Bubbles are however not passive under the application of vibrations and acoustic excitations, as the dynamic pressure field drives them into volumetric oscillations.…”

Section: Introductionmentioning

confidence: 99%

Acoustic bubble dynamics in a yield-stress fluid

Saint-Michel

Garbin

2020

Soft Matter

View full text Add to dashboard Cite

show abstract

“…Petrou et al [22] introduced a radioactive element labelling method that utilized nuclear medicine technology to monitor the deposition of CAs in vibrated concrete. Koch et al [23] and Tian et al [24] used carbomer gel to prepare a transparent paste, and visually observed the settlement and segregation of fresh concrete. After concrete hardening, Barbosa et al [25], Navarrete and Lopez [26], and Nili et al [27] cut the specimen and analysed the CA distribution through image processing.…”

Section: Introductionmentioning

confidence: 99%