# Service Life Prediction and Life Cycle Costs of Light Weight Partitions
## 4 Field Survey Results and Discussion
### Predicting Durability and Performance with Inherent Construction Defects  
Construction failures due to flawed construction significantly reduce the initial performance level of partitions. This foundational data is incorporated into the typical deterioration path of a partition in standard conditions by using Equation (5):  
\[\text{SWCP}=-\alpha\times\text{age}+\beta-\left[\frac{100-\text{ICP}}{\text{n }}\right] \tag{5}\]  
SWCP represents the standard weighted condition performance, combining the initial state and typical deterioration. \(\alpha\) and \(\beta\) are parameters in the regression formula, depicting the typical deterioration path in standard conditions. ICP denotes the average initial component performance. And n is the count of indicators of component deterioration  
Figure 8: Service Life Expectancy (SLE) of Gypsum, Hollow, and Autoclaved Partitions Across Different Occupancy Conditions.  
in standard conditions. This formula is employed to predict the weighted service life expectancy of partitions in various samples, and its results are detailed in Table 5.  
As can be seen, considering the initial state of the partitions reduces the expected lifespan and functional range in various samples, as implied in practice by the survey  
\begin{table}
\begin{tabular}{l c c c c} \hline \hline \multirow{2}{*}{**Occupancy Conditions**} & **Light** & **Moderate** & **Standard** & **Intensive** \\ \cline{2-5}  & \(\mu\) = 0 & **1**\(\leq\mu\) **\textless{} 2** & **2**\(\leq\mu\) **\textless{} 4** & \(\mu\geq\) 4** \\ \hline
**Gypsum board** & & & & \\ \hline Service life prediction MRCP60\% [years] & 89 & 44 & 24 & 10 \\ Expected service life interval MRCP60\% [years] & 94–83 & 48–40 & 27–22 & 15–5 \\ Component performance interval expected at 20 years & 92–87 & 83–76 & 69–62 & 45–15 \\ Component performance interval expected at 25 years & 89–85 & 79–72 & 63–56 & 30–0 \\
**Autoclaved Concrete Blocks** & & & & \\ \hline Service life prediction MRCP60\% [years] & n/a & 68 & 30 & 16 \\ Expected service life interval MRCP60\% [years] & n/a & 74–62 & 34–27 & 12–22 \\ Component performance interval expected at 20 years & n/a & 86–82 & 74–68 & 63–45 \\ Component performance interval expected at 25 years & n/a & 84–79 & 69–63 & 56–36 \\
**Hollow Concrete Blocks** & & & & \\ \hline Service life prediction MRCP60\% [years] & 158 & 113 & 82 & 36 \\ Expected service life interval MRCP60\% [years] & 167–151 & 120–106 & 91–74 & 44–29 \\ Component performance interval expected at 20 years & 94–93 & 91–87 & 89–82 & 80–68 \\ Component performance interval expected at 25 years & 93–92 & 90–86 & 87–80 & 76–64 \\ \hline \hline \end{tabular}
\end{table}
Table 5: Service Life Predictions at a Minimum Required Component Performance level of 60% (MRCP60%) expectancy; Component Performance Intervals for Various Partitions in Different Occupancy Conditions.  
Figure 9: Comparison of Predicted Service Life Expectancy (MRCP 60%) Across Different Partition Types—Gypsum, Hollow, and Autoclaved—In Varying Service Conditions (Light, Moderate, Standard, Intensive). Each bar represents the mean service life expectancy in specific service conditions, highlighting the relative performance and durability of each partition.  
results. The service life expectancy of gypsum board partitions with a performance level of 60% MRCP reaches 89-94% of the value of a well-constructed partition in similar service conditions but does not show functional defects. The reduced service life expectancy of partitions made of autoclaved aerated concrete blocks, when compared to a well-executed component, amounts to 6-11%; hollow concrete blocks are more moderate, and only amount to 3.7-5.26%.