Rectification of a large vertical wall surface for flatness

Abstract

This paper describes the efforts made in rectifying a large prestressed, L-shaped, vertical reaction wall with circular cavities and the lessons learnt. The wall was to be constructed with a certain flatness requirement, which it later turned out was not met. Though various studies have been undertaken in the past describing rectification of horizontal concrete floors, the present study discusses a novel approach to determine the extent of non-compliance and then re-surfacing of the vertical wall to achieve required flatness. The paper discusses in detail the applicability of various instruments like profilometers, water level manometers, and laser-based tools in determining the extent of undulations. It was found that the rotating laser-based tool best served the purpose for defect identification and that placing a layer of micro concrete along with a bonding agent using a novel construction method helped to achieve the desired level of flatness.