Study on Consolidation of Concrete with Vibration

Date, Shigeyuki; Goryozono, Yuji; Hashimoto, Shinichiro

doi:10.1016/j.phpro.2012.03.091

Cited by 6 publications

(7 citation statements)

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“…On the other hand, many researches have showed that the rheological properties of concrete change under vibration [9][10][11][12]. Tattersall used a vertical tube method to study fresh concrete under vibration.…”

Section: Introductionmentioning

confidence: 99%

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The extension of thixotropy of cement paste under vibration: a shear-vibration equivalent theory

Gao

Zhang

et al. 2020

Science and Engineering of Composite Materials

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The rheology of cement paste under vibration follows the transformation from Bingham model to Hershel-Bulkly model to Power-Law model. Most of the existing research is obtained through a large number of experiments in the data fitting process, and cannot express the time-varying characteristics of viscosity. Furthermore, thixotropy of cement paste is based on static experiment and cannot be applied under vibration. In this paper a shear-vibration equivalent theory is proposed, which consider the effect of vibration is the same as the shear effect on the viscosity change of cement paste. Combining vibrational shear equivalent theory and HI theory, the rheological changes of cement paste under vibration are obtained through numerical simulation. This theory has been verified by a series of experiments with numerical simulations, and can be used to study the rheology of concrete under vibration.

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Section: Introductionmentioning

confidence: 99%

“…However, there is still something to modify in the calculation. First, the memory modules Γ and coagulation rate H are calculated by the total shear rate, which are shown in formula (11) and (12):…”

Section: Introduction Of Shear-vibration Equivalent Theorymentioning

confidence: 99%

The extension of thixotropy of cement paste under vibration: a shear-vibration equivalent theory

Gao

Zhang

et al. 2020

Science and Engineering of Composite Materials

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“…In the mechanical method, a vibration is introduced during concrete casting to ensure proper concrete consolidation. Generally, using vibration for compaction is the standard practice both for cast in place concrete and for precast concrete [3,4]. The manual compacting method is widely used in molding test specimens on the construction that are latter sent to laboratory in order to evaluate the quality of the concrete.…”

Section: Introductionmentioning

confidence: 99%

“…An increase by about 1.23 times in chloride content (% weight of cement) was observed. DATE et al [3] detected that the productivity of concrete with vibration consolidation increases as the sand percentage and the content of fly ash also increase. There are a few techniques that can be used for monitoring the transmission process of the vibration effort for fresh concrete during compacting.…”

Section: Introductionmentioning

confidence: 99%

“…One of this paper discussions is the fact the Brazilian standards for compressive strength testing [9] allows using the manual or mechanical procedures for molding the test specimens. However, according to what is discussed in literature [3,4,7], each one of the methods has its own characteristics; in order to verify if those characteristics interfere with the results of compressive strength testing, this paper has the objective of investigating the influence of the two main compacting methods (manual and mechanical) over this parameter of concrete, by means of monitoring the compressive strength of tests specimens during a period of 2 years.…”

Section: Introductionmentioning

confidence: 99%

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Influence of different compacting methods on concrete compressive strength

Medeiros-Junior

Lima²,

Oliveira

2018

Matéria (Rio J.)

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Adequate compacting is an important stage contributing for the durability and final quality of concrete structures. The two main ways of compacting concrete are: manual and mechanical (immersion vibrator). This paper has the goal of verifying the influence of those two compacting methods on the compressive strength of concrete from long term data. In order to do that, cylindrical test specimens of a same concrete were molded with different compacting methods and the compressive strength was investigated at 1, 3 , 7, 14, 21, 28, 63, 91, 180, 365 and 730 days. Concrete used was casted in plant. Manual compacting was performed using a metallic and cylindrical rod. Mechanical compacting was performed using a rigid immersion vibrator driven by an electric motor. This study confirmed greater compressive strength in test specimens compacted with immersion vibrator, when compared with results in manually compacted test specimens. However, the novelty of this article is that variance analysis test demonstrated that only from 63 days the difference between compressive strengths is significant. Long term data also made it possible to generate a trend equation with good coefficient of determination for estimating the difference between compressive strengths for the two compacting methods investigated over time.

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Effect of loss water during vibrations on the compressive strength of concrete fc’ 21.7 Mpa

Roding

Candra

Karisma

et al. 2021

IOP Conf. Ser.: Mater. Sci. Eng.

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Concrete is an important material in construction because it is necessary to improve the quality of concrete. One of the quality of concrete is influenced by the presence of air cavities in the concrete. The air cavity in concrete can be reduced by vibrating. The vibrating air cavity in the concrete will rise to the surface in the form of water. The purpose of this study was to determine the effect of the amount of water that rises to the surface as a result of vibrations on the concrete compressive strength of fc’21.7 MPa. The method used in this research is the experimental method and the study of previous research theories. Vibration uses an external vibration method with the acceleration of 180 m/s2, variation velocity 160 mm/s, and displacement of 1000 mm. The time variations used are 1 minute, 2 minutes, and 3 minutes. The specimen is cylindrical, with a diameter of 15 cm and a height of 30 cm. The results showed the highest amount of water that was on the surface contained in the vibration with a time of 3 minutes with a compressive strength of 23.35 MPa and water content 0.78 gr.

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Study on Consolidation of Concrete with Vibration

Cited by 6 publications

References 0 publications

The extension of thixotropy of cement paste under vibration: a shear-vibration equivalent theory

The extension of thixotropy of cement paste under vibration: a shear-vibration equivalent theory

Influence of different compacting methods on concrete compressive strength

Effect of loss water during vibrations on the compressive strength of concrete fc’ 21.7 Mpa

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