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

[Full Text]

AUTHOR(S)

Soehardjono A, Widayanto E, Wisnumurti, Zacoeb A

KEYWORDS

CPB, engine pressure, frequency, vibration time, vibropressing

ABSTRACT

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.

REFERENCES

[1] ACI Committee 309, “Report on Behavior of Fresh Concrete During Vibration,” vol. 93, no. Reapproved, p. 22, 2008.

[2] X. Yanjun, L. Rui, S. Haiping, J. Ran, and Z. Jiayu, “The Characteristics of Perlite Sound Absorption Board Formed By Vibration Molding,” Open Mater. Sci. J., vol. 9, no. 1, pp. 39–42, 2015.
[3] S. This and I. Compaction, “DS2006-Compaction-of-Concrete,” no. june, 2006.
[4] C. Wersäll, Frequency Optimization of Vibratory Rollers and Plates for Compaction of Granular Soil. 2016.
[5] H. B. Koh, D. Yeoh, and S. Shahidan, “Effect of re-vibration on the compressive strength and surface hardness of concrete,” IOP Conf. Ser. Mater. Sci. Eng., vol. 271, no. 1, 2017.
[6] M. E. Arslan, E. Yozgat, S. Pul, and M. Husem, “Effects of vibration time on strength of ordinary and high performance concrete,” Recent Res. Geogr. Geol. Energy, Environ. Biomed. - Proc. 4th WSEAS Int. Conf. EMESEG’11, 2nd Int. Conf. WORLD-GEO’11, 5th Int. Conf. EDEB’11, pp. 270–274, 2011.
[7] C. Udawattha, H. Galabada, and R. Halwatura, “Case Studies in Construction Materials Mud concrete paving block for pedestrian pavements,” Case Stud. Constr. Mater., vol. 7, no. March, pp. 249–262, 2017.
[8] B. Arslan and T. Kamas, “Investigation of aggregate size effects on the compressive behavior of concrete by electromechanical and mechanical impedance spectroscopy,” Procedia Struct. Integr., vol. 5, pp. 171–178, 2017.
[9] E. Widayanto, A. Soehardjono, and A. Zacoeb, “The Effect of Vibration Energy Changes on Compressive Strength of Concrete Paving Block ( CPB ) in Concreting Process with Vibropressing System,” vol. 171, no. Icoemis, pp. 416–425, 2019.
[10] D. Shin, D. Kim, B. Madavali, D. Kim, and J. Kim, “Journal of Magnetism and Magnetic Materials Densi fi cation mechanism and its e ff ect on the magnetic properties of Nd-Fe- B bonded magnets through the new high-energy compaction method,” J. Magn. Magn. Mater., vol. 482, no. January, pp. 280–286, 2019.
[11] P. Dybeł and M. Kucharska, “Effect of bottom-up placing on bond properties of high-performance self-compacting concrete,” vol. 243, pp. 1–11, 2020.
[12] A. Kovalska and J. Auzins, “Investigation of vibropressing process technology,” Eng. Rural Dev., pp. 408–412, 2011.
[13] K. Baskaran and K. Gopinath, “Study on Applicability of ACI and DoE Mix Design Methods for Paving Blocks,” pp. 127–134, 2013.
[14] B. Cap, B. Cap, M. Valve, and B. Components, “Standard Practice for Brushmattressing,” vol. 99, no. Reapproved 2010, pp. 1–3, 2015.
[15] Badan Standar Nasional Indonesia, “Bata Beton (Paving Block),” Badan Standar Nas. Indones., pp. 1–9, 1996.