The effect of vibropressing compaction process on the compressive strength based concrete paving blocks

Abstract

Concrete paving blocks are a mixture of cement and aggregates, which using compressive energy blocks. Paving concrete is a dry concrete category, so it requires block energy in the compaction process. Block energy consists of manual blocks, block presses, and vibropressing blocks. They are pressing blocks to use hydraulics with a strong push of 75 kg/cm² with a 1, 2, and 3 s durations. Then the blocky vibropressing method, namely by making variations on the vibrating length between 4-8 seconds and a frequency of 25-50 Hz and pressing 75 kg/cm². All test specimens with the same volume ratio composition of 1 cement:4 sand:4 crushed stone ash 0-5 mm, and the water and cement ratio are 0.6. The results showed that the manual block and the pressing block did not have a sharp increase in compressive strength even though more blows in the manual bock and increased time in the bock pressing method. The vibropressing process shows a significant and linear growth in compressive strength with increase vibrations and frequencies. The conclusion is that the compressive strength of paving block concrete is very dependent on blocked in terms of the frequency and duration of vibrations.