Proceedings e report - Firenze University Press
Proceedings e report - Firenze University Press
Proceedings e report - Firenze University Press
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DEFIBRING OF HISTORICAL ROOF BEAM CAUSED BY AMMONIUM BASED FIRE RETARDANTS<br />
Fig. 7 and 8 - Fine fibres present on the wood surface due to the defibring. Fig. 9 - Coarser (longer) fibres<br />
present on the defibred wood surface.<br />
Table 1: Loss of lignin as determined by FTIR I1510/I1372 band intensity ratios. Each value used is average of<br />
triplicate measurements. Band assignment: 1510 cm -1 – stretching vibration of the double bond in aromatic ring<br />
of lignin, 1372 cm -1 – out-of-plane bending vibration of CH bond at the cellulose glycoside ring.<br />
Sample I1372 I1510 I1710 I1510/I1372 I1710/I1510<br />
Undamaged wood<br />
Fir<br />
Pine<br />
0,169<br />
0,086<br />
0,235<br />
0,123<br />
0,036<br />
0,028<br />
1,391<br />
1,434<br />
0,153<br />
0,224<br />
Wood chip 2 0,127 0,083 0,121 0,658 1,449<br />
8 0,111 0,100 0,088 0,898 0,881<br />
10 0,061 0,066 0,235 1,089 3,567<br />
Coarser fibres 1 0,081 0,046 0,151 0,574 3,244<br />
The Český Krumlov Castle<br />
4 0,079 0,041 0,100 0,516 2,449<br />
5 0,083 0,027 0,206 0,329 7,534<br />
Fine fibres 2 0,092 0,023 0,159 0,247 6,997<br />
7 0,133 0,015 0,124 0,114 8,136<br />
13 0,125 0,036 0,088 0,285 2,462<br />
Wood chip 10 0,111 0,220 0,072 1,985 0,327<br />
11 0,089 0,134 0,147 1,510 1,097<br />
13 0,112 0,139 0,213 1,241 1,528<br />
The Old Royal Palace,<br />
Prague Castle<br />
Coarser fibres 8<br />
10<br />
11<br />
0,246<br />
0,062<br />
0,114<br />
0,432<br />
0,091<br />
0,060<br />
0,229<br />
0,189<br />
0,125<br />
1,759<br />
1,482<br />
0,522<br />
0,530<br />
2,073<br />
2,101<br />
Fine fibres 9 0,155 0,046 0,138 0,295 3,007<br />
12 0,261 0,149 0,162 0,569 1,091<br />
21 0,288 0,087 0,378 0,303 4,338<br />
Wood chip 5 0,132 0,324 0,135 2,453 0,417<br />
7 0,049 0,142 0,112 2,894 0,790<br />
11 0,058 0,136 0,141 2,338 1,032<br />
Coarser fibres 1 0,080 0,058 0,188 0,727 3,241<br />
House in street U Půjčovny<br />
4 0,063 0,081 0,412 1,286 5,122<br />
8 0,077 0,107 0,147 1,386 1,374<br />
Fine fibres 2 0,070 0,045 0,060 0,641 1,330<br />
3 0,129 0,105 0,124 0,813 1,177<br />
6 0,076 0,096 0,198 1,262 2,052<br />
The relative increase in the carbonyl group content of the wood matter was evaluated based in the I1710/<br />
I1510 band intensity ratio where the band at 1710 cm -1 is due to stretching vibrations of the carboxyl<br />
C=O bond and the band at 1510 cm -1 is due to stretching vibrations of the double bond in the lignin<br />
aromatic ring (Table 1). This relative carboxyl group content in the wood was found to increase with<br />
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