Abstract
The study aims at examining the effect of covering sheet on surface quality of concrete. The study uses a concrete-form simulating tunnel sidewall of negative angle and various sheets covering the form, and investigates bugholes and color irregularity of the concrete made in the form covered with the sheet. The primary parameters in the comparative test are water-pressure resistance and air-permeability of the covering sheet. The experimental study shows that water-proofing material sheet contribute decrease color-irregularity as well as bugholes. Based on the laboratory test, this paper presents appropriate properties of sheet to improve concrete surface quality.
