# 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
**Hollow 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-Crack at Partition-Ceiling Junction** & & & & \\ \hline Service life prediction MRCP60\% [years] & 141 & 100 & 72 & 32 \\ Expected service life interval MRCP60\% [years] & 149–135 & 107–93 & 83–64 & 39–24 \\ Component performance interval expected at 20 years & 90–89 & 87–83 & 85–78 & 76–64 \\ Component performance interval expected at 25 years & 89–88 & 85–82 & 83–76 & 72–60 \\
**Failure mechanism** & \multicolumn{5}{c}{**Crack at Partition-Wall Junction**} \\ \hline Service life prediction MRCP60\% [years] & 146 & 104 & 75 & 33 \\ Expected service life interval MRCP60\% [years] & 154–139 & 111–97 & 85–66 & 40–26 \\ Component performance interval expected at 20 years & 91–90 & 88–84 & 86–79 & 78–65 \\ Component performance interval expected at 25 years & 90–89 & 87–83 & 84–77 & 73–61 \\
**Failure mechanism** & \multicolumn{5}{c}{**Crack Around Door Frame**} \\ \hline Service life prediction MRCP60\% [years] & 141 & 100 & 72 & 32 \\ Expected service life interval MRCP60\% [years] & 149–135 & 107–93 & 83–64 & 39–24 \\ Component performance interval expected at 20 years & 90–89 & 87–83 & 85–78 & 76–64 \\ Component performance interval expected at 25 years & 89–88 & 85–82 & 83–76 & 72–60 \\
**Failure mechanism** & \multicolumn{5}{c}{**Cracks on the Surface**} \\ \hline Service life prediction MRCP60\% [years] & 145 & 103 & 74 & 33 \\ Expected service life interval MRCP60\% [years] & 153–139 & 110–96 & 85–66 & 40–26 \\ Component performance interval expected at 20 years & 91–90 & 88–84 & 86–79 & 77–65 \\ Component performance interval expected at 25 years & 90–89 & 86–83 & 84–77 & 73–61 \\
**Failure mechanism** & \multicolumn{5}{c}{**Stability of Electrical Installations**} \\ \hline Service life prediction MRCP60\% [years] & 146 & 104 & 75 & 33 \\ Expected service life interval MRCP60\% [years] & 154–139 & 111–97 & 85–66 & 40–26 \\ Component performance interval expected at 20 years & 91–90 & 88–84 & 86–79 & 78–65 \\ Component performance interval expected at 25 years & 90–89 & 87–83 & 84–77 & 73–61 \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Service Life Predictions at a Minimum Required Component Performance level of 60% (MRCP60%); Component Performance Intervals for Hollow Concrete Blocks in Different Occupancy Conditions. overall average decrease in the performance level of hollow concrete block partitions, as a result of cumulative failure mechanisms, totals 18 performance points. In this condition, these partitions would be expected to reach a 60% performance level in less than 50 years, but only if their standard deterioration processes are subject to the influence of negative occupancy factors at the \(2\geq\mu\) level. It can also be expected that, for a component lifespan of about 25 years, the performance range of this partition type will not drop below the minimum desired performance level of MRCP60%. This analysis emphasizes the importance of considering the combined effect of failure mechanisms when predicting the service life expectancy and performance range of partitions in failure conditions, and stresses that this issue is particularly important in a building design and maintenance context.