concrete crushing is how many decibles

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    This scale is a logarithmic scale meaning the noise level doubles with each 10 dB increase—at a level of 80 dB normal conversation is possible, while at 90 dB you would have to shout to be heard. The National Institute for Occupational Safety and Health (NIOSH) has set a Recommended Exposure Limit of 85 dB for eight hours a day.

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    Noise Levels for Common Equipment The following table can be used to determine if employees should participate in the University of Florida’s Hearing Conservation Program (HCP). If an employee’s use of equipment exceeds the allowable time more than two times per month, that employee needs to be included in the HCP. If an employee uses a

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    Oct 28, 2013· Concrete usually reaches 75% of the 28-day strength at seven days. If your concrete is not reaching the proper 28-day strength, I would troubleshoot each step of the process to determine why. Here are example questions you can ask: Q: Is the mix design correct? A high water-cement ratio will result in a concrete with reduced strength.

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    The compressive strength of concrete is the most common performance measure used by the engineer in designing buildings and other structures. The compressive strength is measured by breaking cylin-drical concrete specimens in a compression-testing machine.

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    sound energy, in dB, of airborne sound as it passes through a wall. In general, the STL of a concrete masonry wall increases with increasing frequency of the sound. Many sound transmission loss tests have been per-formed on various concrete masonry walls. These tests have indicated a direct relationship between wall weight

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    Nov 26, 2014· The problem was that David McAfee was not in the market for another crusher. To convince McAfee, the team demonstrated a QI240 PriSec mobile impact crusher. The demonstration and subsequent analysis showed that while the overhead of a second machine had been added to the crushing process, the cost per ton of crushed concrete decreased.

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  • Common Noise Levels - Foundation

    Common Noise Levels A“decibel” is the unit to measure the loudness of sound. Decibel levels for each item shown in the graph may vary. If you need to raise your voice to be heard an arm’s length away, the noise is probably loud enough to damage your hearing.

  • Concrete Crushing ???? | Heavy Equipment Forums

    Sep 10, 2015· I need some advice, Mobile Jaw or Impact crusher. We recycle concrete/bricks etc for about 6 years, We ran 380 Jaw crushers and it worked well I sold this unit 12months ago.I'm Looking to start crushing again and a few blokes have been saying mobile impact crushers are the go in stead of the jaw,I would like to buy a machine around 30 ton mark any coments.