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IJSTR >> Volume 9 - Issue 9, September 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Effect Of Frequency On Compressive Strength Under Various Presses In Making Concrete Paving Blocks (CPB)

[Full Text]



Soehardjono A, Widayanto E, Wisnumurti, Zacoeb A



CPB, engine pressure, frequency, vibration time, vibropressing



The vibration method is the beginning of the use of vibropressing in the concrete compaction process. It is very different from the CPB compaction process. The most significant difference is in the practical volume. In concrete, 2m3 is compacted at the same place and time, while CPB at 15 liters volume is compacted at the same location at the same time, whereas more than 15 liters is compacted at the same place and at different times. With a compressive strength of about 25 MPa, it was using a composition of material with per m3 of 100 kg of cement, 380 kg of sand and 560 kg of stone ash, and using a water-cement ratio of 0,6. This research only changes three-parameter limited. They are vibration time between 7 and 8 seconds with the frequency at 30-50 Hz, engine pressure at 25 and 90 kg/cm2. The reason 7 and 8 second for the vibration time in this research is the maximum vibration time in CPB production. All specimens are made with the same mixture composition. There are 3 main parameters in the vibropressing process namely vibration frequency, engine pressure and vibration time, explained that the vibration frequency has the most influence in the process of increasing the compressive strength of CPB. By limiting the electric motor energy of 7 Hp, vibration time (7-8) seconds on engine pressure (25-90) Kg/cm2, this machine produces CPB optimum compressive strength (22-31) MPa at frequency (43-47) Hz.



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