Inspection of flatness and levelness of construction surface using terrestrial laser scanner according to ASTM E1155 standard

Abstract

The flatness of the surface is one of the important indicators to access the quality of the concrete surface during and after the construction process. The terrestrial laser scanner with many outstanding advantages in accuracy, high point density and high data rate acquisition has become an effective tool for construction quality inspection. The most advantage of the ground laser scanner for assessment of floor flatness compared to traditional methods is so quickly data acquisition and able to measure when the concrete floor is still wet. This allows the contractor to identify and fix the errors without waiting for the floor to dry so it can reduce both costs and time for construction. However, in Vietnam today, there is still a lack of standards as well as technical guide to apply this technology in evaluating the flatness of the surface construction effectively. The article proposes a four-step procedure to access the flatness using a laser scanner based on the ASTM E1155 standard. The field work is carried out by using GLS 2200 scanner and uses the four-step procedure to evaluate the surface flatness of the construction. From experimental results, it can be confirmed that the above four-step proposed procedure is suitable to evaluate the flatness of the surface construction by laser scanner in Vietnam conditions. The article is an initial study from theoretical analysis, development of procedure and field work. Therefore, the article can be used as a technical guide for geodetic engineers in the quality control constructionas well as a reference for state management agencies in making standard for the assessment of surface flatness using terrestrial laser scanner.