PSI - Issue 11

Gabriela Lotufo Oliveira et al. / Procedia Structural Integrity 11 (2018) 242–249 Gabriela Lotufo Oliveira, Fabiana Lopes de Oliveira, Sérgio Brazolin / Structural Integrity Procedia 00 (2018) 000–000 7

248

Table 3. Results of the penetration and retention tests.

Sample

Retention (kg/m³)

Penetration

1338 1339 1340 1341 1342 1343 1387 1389 1394 1395 1396 1397 1399 1402 1403 1405 1406 1407 1408 1412 1423

2,8 1,5 2,7 2,9 3,0 3,0 4,5 3,8 3,4 5,4 2,7 4,3 2,3 4,3 2,6 4,5 4,7 5,2 4,1 4,8 4,4

TP

IP IP

TP TP TP TP TP TP TP TP IP

IP IP IP

TP TP

IP IP IP IP

Fig. 4. Example of samples with (a) total penetration of the preservative and (b) irregular penetration of the preservative.

The ABNT NBR 16143 (ABNT, 2013c) standard sets forth that minimum retention for wood used above ground, but exposed to wetting, must be 4 kg/m³. However, 12 (57%) out of the 21 tested samples achieved results bellow that value. Consequently, in case those boards were used for CLT production, the panels could have lower performance than the expected in the prevention of building pathologies originated from biodeterioration processes, thus not achieving the estimated project life. According to the Brazilian standard ABNT NBR 15575 (ABNT, 2013b), the life of building or structural components must be at least 50 years. As for the penetration results, 10 samples (47%) didn’t obtain total penetration. The analyzed standard (ABNT, 2013c) sets forth that the preservative must reach all permeable portion of wood. Pinewood is considered completely permeable, and therefore, able to be treated, since there is no heartwood, which is the portion of wood inaccessible to preservation treatments, even those under pressure. However, despite the irregular penetration of the preservative, in those 10 samples, there was a great amount of treated wood that could protect the structural components against decay. Therefore, the analysis of the tested parameters implies the importance of implementing a quality control system of the CCB-treated wood used for CLT production.