## Compaction of concrete## Compaction of concrete is the process adopted for expelling the entrapped air from the concrete. Method for compacting concrete, Hand compaction Compaction by vibrator Compaction by pressure and jolting Compaction by spinning. # Hand compaction# Adopted in case of unimportant concrete This can be adopted when mechanical mean cannot be used It consist of Roding Ramming Tamping Roding : Poking the concrete with about 2m long 16 mm dia rod to poke the concrete reinforcement Ramming; Should be done with care Permitted in unreinforced foundation concrete in ground floor construction Tamping: The thickness of conc should be comparatively less Consist of beating the op surface by wooden cross beam The section of wooden beam is about 10x10 cm # Compaction by vibrators # We can place the concrete economically when compared to hand compaction The use of vibrators may be essential for the production of good concrete . Type of vibrators:: Internal vibrator Formwork vibrator Table vibrator Platform vibrator Surface vibrator Vibratory rollers # Compaction by pressure and jolting # This is one of the effective method of compacting dry concrete Often used for compacting hollow block ,cavity blocks concrete blocks The stiff concrete is vibrated pressed and also given jolts With the combined action of the three the stiff conc gets compacted to an dense form to give good strength and volume # Compaction by spinning# This is one of the recent method of the compacting concrete This is adopted for fabrication of concrete pipes The plastic concrete when at every high speed get well compacted by centrifugal force Potential products such as spun pipes are compacted by spinning process Vibratory rollers: One of the recent methods of compacting very lean or dry concrete The concrete compacted by rollers can be called as roller concrete.
Posted on: Mon, 01 Sep 2014 07:23:04 +0000
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