Developing Sustainable Concrete Compaction using a Proposed Multi-vibration Technique

Abstract

This study seeks to develop a sustainable construction technique based on the introduction of a specific method for improving concrete compressive strength through a proposed multi-vibration compaction method. An experimental program is performed to evaluate the effect of the proposed compaction technique on fresh silica fume concrete undergoing the initial setting. Multi-vibration intends to minimize concrete production cost because it upgrades the compressive strength of the same materials with better utilization of the vibration energy required for compaction. The collected experimental data presented assign relationships among vibration duration, vibration cycles or phases, and compressive strength upgrading of single vibrated, revibrated, and multi-vibrated specimens for analysis and discussion. This study shows that multi-vibration phases, rather than single vibration or revibration techniques, are powerful techniques for improving concrete compressive strength. The results indicated that the existence of an optimum multi-vibration mode was dominated by phase number and vibration duration and confirm the reliability vibration overall time duration recommended by ACI 309 which relates to a single vibration time limit to be considered in the case of multi vibration technique. Multi-vibration Mode 8 (subjected to three vibration phases 10, 20, and 30 sec ) has the best effect for the considered mixtures among the specific vibration modes. The maximum improvement ratio is 1.25, which is associated with the plastic mixture.

Impact of Mixing Methods and Cement Dosage on Unconfined Compressive Strength of Cement-Stabilized Macadam

“…In recent years, the vibratory mixing method has been applied to improve the mechanical performance of different cement-based materials in China, such as steel fiber-reinforced concrete (SFRC) (Zheng et al, 2018), high-strength lightweight aggregate concrete (HSLWAC) (Luo et al, 2020;Xiong et al, 2019), and high-strength concrete (HSC) (Zhao et al, Zhao, Jiang, et al, 2019), especially cement-stabilized macadam (CSM) (Wang & Tan, 2021). Before this, the application of vibration in cement-based materials has proved its advantages on consolidating mixture (Liu et al, 2016;Zemam, 2020), reducing the internal friction force of fresh concrete (Safawi et al, 2004), and eliminating the voids and entrapped air present in the mixture (Koch et al, 2019). Other vibratory mixing methods, like using an immersion vibrator in the middle stage of mixing when the mixer was stopped, are also studied to improve the properties of cement-based materials., Juradin et al (2014) found that the introduction of vibration in the mixing stage provided an improvement to the workability of fresh concrete without affecting compressive strength, while Jia et al (2019) found an improvement in compressive strength and frost-resistance.…”