# Service Life Prediction and Life Cycle Costs of Light Weight Partitions
## 4 Field Survey Results and Discussion
### Service Life Expectancy and Performance Level under Failure Conditions
\begin{table}
\begin{tabular}{l c c c c} \hline \hline
**Autoclaved Concrete Blocks** & \multicolumn{1}{c}{**Light**} & **Moderate** & **Standard** & **Intensive** \\ \cline{2-5}
**Occupancy Conditions** & \multicolumn{1}{c}{\(\mu\) = 0} & \multicolumn{1}{c}{\(1\leq\mu\) < 2} & \multicolumn{1}{c}{\(2\leq\mu\) < 4} & \multicolumn{1}{c}{\(\mu\geq\) 4} \\ \hline
**Failure mechanism** & \multicolumn{4}{c}{**Crack at Partition-Ceiling Junction**} \\ \hline Service life prediction MRCP60\% [years] & n/a & 59 & 26 & 14 \\ Expected service life interval MRCP60\% [years] & n/a & 65–53 & 29–23 & 9–19 \\ Component performance interval expected at 20 years & n/a & 82–77 & 70–63 & 58–41 \\ Component performance interval expected at 25 years & n/a & 79–75 & 64–58 & 51–32 \\
**Failure mechanism** & \multicolumn{4}{c}{**Crack at Partition-Wall Junction**} \\ \hline Service life prediction MRCP60\% [years] & n/a & 60 & 27 & 14 \\ Expected service life interval MRCP60\% [years] & n/a & 66–54 & 30–23 & 9–19 \\ Component performance interval expected at 20 years & n/a & 82–78 & 70–64 & 59–41 \\ Component performance interval expected at 25 years & n/a & 80–75 & 65–58 & 51–32 \\
**Failure mechanism** & \multicolumn{4}{c}{**Crack Around Door Frame**} \\ \hline Service life prediction MRCP60\% [years] & n/a & 58 & 26 & 13 \\ Expected service life interval MRCP60\% [years] & n/a & 64–53 & 29–23 & 9–19 \\ Component performance interval expected at 20 years & n/a & 81–77 & 69–63 & 58–40 \\ Component performance interval expected at 25 years & n/a & 79–74 & 64–58 & 51–31 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Service Life Predictions at a Minimum Required Component Performance level of 60% (MRCP60%); Component Performance Intervals for Autoclaved Concrete Blocks in Different Occupancy Conditions. The average total decrease in performance level as a result of the combined influence of failure mechanisms reaches 23 performance points in the gypsum board partition and 21 performance points in the autoclaved aerated concrete block partition sample. Table 10 presents the service life prediction in cumulative failure conditions. In this case, light-weight partitions are expected to reach a 60% performance level in less than 50 years. The \begin{table}
\begin{tabular}{l c c c c} \hline \hline
**Autoclaved Concrete Blocks** & **Light** & **Moderate** & **Standard** & **Intensive** \\ \cline{2-5}
**Occupancy Conditions** & **\(\mu\) = 0** & **1 \(\leq\)\# < 2** & **2 \(\leq\)\# < 4** & \(\mu\geq\) 4** \\ \hline
**Failure mechanism** & \multicolumn{5}{c}{**Cracks on the Surface**} \\ \hline Service life prediction MRCP60\% [years] & n/a & 59 & 26 & 14 \\ Expected service life interval MRCP60\% [years] & n/a & 65–54 & 29–23 & 9–19 \\ Component performance interval expected at 20 years & n/a & 82–77 & 70–63 & 58–41 \\ Component performance interval expected at 25 years & n/a & 80–75 & 65–58 & 51–32 \\
**Failure mechanism** & \multicolumn{5}{c}{**Stability of Electrical Installations**} \\ \hline Service life prediction MRCP60\% [years] & n/a & 62 & 28 & 15 \\ Expected service life interval MRCP60\% [years] & n/a & 68–57 & 31–25 & 10–20 \\ Component performance interval expected at 20 years & n/a & 83–79 & 71–65 & 60–42 \\ Component performance interval expected at 25 years & n/a & 81–76 & 66–60 & 53–33 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: _Cont._