Which of the following factors determines the frequency of a concrete vibrator?
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A.
The ambient temperature
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B.
The type of cement used
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C.
The water-cement ratio
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D.
The size of the aggregate in the mix
Correct Answer:
C. The water-cement ratio
Explanation:
The correct answer is The water-cement ratio.
The frequency of a concrete vibrator is primarily determined by the water-cement ratio of the concrete mixture. In concrete technology, the workability and consistency of the mix dictate the required vibration parameters to ensure proper compaction and the removal of entrapped air. A lower water-cement ratio typically results in a stiffer mix that requires a higher frequency and greater amplitude of vibration to achieve full consolidation. Conversely, more fluid mixes with higher water-cement ratios respond more easily to lower frequencies. While factors like aggregate size and cement type influence the overall mix design, the water-to-cement proportion is the fundamental factor that governs the internal friction and flow characteristics, directly impacting the necessary vibration frequency for effective placement.
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