EFFECT OF VIBRATION TIME ON THE MECHANICAL AND DURABILITY PROPERTIES OF PREVIOUS CONCRETE

Abstract

Pervious concrete is specially designed to allow water to flow through it. The mechanical and durability properties of pervious concrete can be affected by several factors, such as the mix design, compaction, and curing. One of the factors that can affect pervious concrete properties is the vibration time compaction. Therefore, this research aims to investigate the effect of vibration time on the mechanical and durability property of pervious concrete by performing experimental investigation with an incremental vibration time of 0 sec, 2 sec, 4 sec, 6 sec, 8 sec, 10 sec, and 12 sec by using table vibrator on 7th and 28th days of curing age. The water cement ratio (0.4) was kept constant. By using a crushed coarse aggregate of single size 14 sieve size pass and 12 sieve size retain. The result of this research indicates that increasing the vibration time will improve the mechanical and durability properties of pervious concrete. Vibration duration beyond the optimum period of 8 sec of vibration causes the separation of coarse aggregates which affects the mechanical properties and durability properties of concrete negatively. The permeability property of pervious concrete was when vibration increases concrete become dense because of the removal of air bubbles and pore inside the concrete but beyond 8 sec of vibration duration concrete coarse aggregate separates and the concrete becomes porous so permeability increases. For durability properties of pervious concrete vibration duration increases the flow of acid into concrete decreases due to the denseness of concrete but after optimum vibration duration of concrete coarse aggregate separates and the cement slurry moves up to the surface of the concrete. Due to these, the acid can flow into concrete easily and the weight of the concrete decreased. The finding of this research study will be useful for engineers and designers working with previous concrete, to have proper compaction because both under and over-vibration affect the properties of previous concrete.