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Short- and Long-term Performance of Fibre-Reinforced Cement Proffi ififi le Sheets Containing Asbestos and Non-asbestos Materials 92 The Journal of the Royal Institute of Thailand Vol. 37 No. 4 Oct-Dec 2012 Mean (M) 85.7 74.4 70.4 81.1 43.1 35.9 31.3 24.3 Std* (Sd) 5.8 18.2 4.4 6.0 5.2 4.8 6.1 4.2 L1 =M+0.58×Sd 89.0 - 73.0 - 46.1 - 34.8 - Ls =M-0.58×Sd - 63.8 - 77.6 - 33.1 - 21.9 L =Ls/L1 0.72 1.06 0.72 0.63 * Standard deviation Table 1 Classification of moisture appearing on the underface of the sheet Table 2 Comparison of mean bending moment at rupture for control and warm-water sets Quantities, Types of Tiles Appearance Blue Brown Green Red No moisture 2 8 6 5 Partially damp 4 0 2 2 Severely damp 2 0 0 1 Blue Bending Moment at Rupture, N-m/m Types of Tiles Control Set Control Set Control Set Control Set Warm water Warm water Warm water Warm water Brown Red Green