Laboratory Evaluation of the Response of Reinforced Concrete to Internal Vibration.

摘要

The objectives of this first phase of a proposed two-phase study were (1) to evaluate the effectiveness of various vibratory efforts on several reinforced concrete specimens,and (2) to determine which parameters most affect the compaction of reinforced concrete in slipform paving. To achieve these objectives, a statistically designed experiment was performed. In this experiment,three different mix designs and nine different combinations of frequency and duration of vibration (treatments) were examined. The factors measured included the frequency and amplitude of vibration,particle acceleration in the concrete,pulse velocity,nuclear density and several pertinent concrete parameters. The data obtained were statistically analyzed by computer and the results indicated that the 13,200, 12,000and 10,800cycles per minute (cpm) frequencies were at 5% level of significance equally effective in compacting concrete and that all the three frequencies were significantly more effective than the 9,600and the 7,300 cpm frequencies. (Modified author abstract)