South African Conference on Polymers in Concrete, Berg-en-Dal, Kruger National Park Jun 20-23, 2000

1. Introduction

Industrial floors are required to resist extreme environmental stresses. The planning and the installation are therefore not easy tasks. Unnecessary damage is an all too common result. A properly dimensioned and fitted concrete slab is not expensive, and is sufficient for many loads (Gebhardt and Holland). If the strength of the surface needs to be improved, and/or if it needs protection from chemical attack, a protective layer of reaction polymers is essential. The surface is first impregnated in order to create a chemically defined surface (Hewlett). The following protective layer may consist of either (1) a thin layer of sealant, 0.1…0.3 mm thick, (2) a coating 0.3…5.0 mm thick, or (3) a screed of 5.0 mm. This layer is often given additional sealing for special effects.

This article considers the question of whether sealant is necessary. In general, the application of another layer is only worthwhile if this layer brings significant advantages. The cost-benefit analysis indicates that a system consisting of fewer elements is better when the costs and properties are the same. An unsealed coating is therefore preferable unless additional benefits are involved. Five properties should be investigated for possible additional benefits:

1. Durability (wear)
2. Scratch resistance
3. Skid resistance
4. Colour
5. Aesthetics and other visual aspects

This article also considers the conditions under which sealant can be omitted, and what savings in material and work then result. Reference is made to future developments under consideration by the RILEM Technical Committee for "Industrial Floors".