Case 1

Maintenance and Diagnostics

Maintenance

Carry out watertightness tests to check screed performance in terms of dampness, curing and thickness of screed in accordance with SS 637 or equivalent. Check integrity of screed and perimeter divorcement.
Ensure there is no obstruction to flow of water, so that water will drain off along the gradient in accordance with SS 637 or equivalent. Regularly inspect for initial signs of water seepage. If the space is above ground floor, check the space or ceiling directly under for any sign of water damage.

• Use a solution of 1/4-cup low-sudsing detergent, or 1-2 tablespoons of either washing soda or trisodium phosphate or commercial floor cleaning powder in 1-gallon water to scrub with an electric floor washer or polisher-scrubber.
• Glazed tiles should be treated like porcelain enamels, because they are easily scratched if incorrect cleaning method is used.
• Avoid using harsh abrasive powders that will scratch the finish. Use plain water to remove soil.
• Occasionally for heavier soils, use a mild detergent solution, rinse well, and wipe dry for more shine.
• Special cleaning may be needed for ceramic tile if there is a buildup of soap scum, a rough white coating, or mildew.

Diagnostics of Defects (see also NDT)

Visual Inspection

• Water ponding is easily spotted.
• One main concern is slipperiness.
• Routine inspection should be able to identify such staining promptly. Fresh stains can be easily removed compared to old stains.

The dry floor friction tester (FFT) is a portable battery-operated machine commonly referred to as “dry FFT” or “Tortus” (Figure (a)). The dry FFT measures the coefficient of friction of the specimen by determining the dynamic friction between the specimen and a slider moving at a constant speed of 1 ± 0.1 m/min. across the surface. Figure (b) shows a wet pendulum slip tester. This pendulum device is portable and consists of a weighted foot with a test slider that swings down and slides across the specimen surface wetted with water. More of these tests are discussed in the chapter on Common Areas.
Common applications include the monitoring of the friction offered by a floor surface (wet or dry) when a foot comes into contact with it, and is applicable for:
– product assessment for frictional resistance
– maintenance and repair
– inspection and diagnostic
– quality control during formulation and manufacturing
– prediction of service life