# Service Life Prediction and Life Cycle Costs of Light Weight Partitions
## 4 Field Survey Results and Discussion
### Partition Performance under Standard Deterioration Conditions  
In this chapter, the deterioration patterns of partition in standard conditions are analyzed. Figures 5-7 present the SCP (standard condition performance) value for each type of partition of observational survey data. The SCP is essential in assessing the performance and durability of partitions, thereby informing their quality and structural integrity over time. A further observation was made by classifying the data by occupancy conditions, according to the number of negative occupancy factors. A comparative regression analysis, augmented by an R-squared test, was employed to elucidate the deterioration patterns for each partition type under varied occupancy conditions. A specific regression equation correlates deterioration to partition age for each type and condition. The SCP, modeled as a linear function of age, is given by Equation (4). \[SCP=\alpha*Age+\beta \tag{4}\]  
In this context, \(\alpha\) represents the slope coefficient, indicating the rate of deterioration over time, and \(\beta\) denotes the intercept coefficient, reflecting the partition's initial performance level. Together, these parameters provide a mathematical model for forecasting the deterioration pattern of partitions in standard conditions. A steeper slope indicates a quicker degradation rate, reflecting the speed at which partition performance decreases over time. This slope is instrumental in understanding durability and projecting how various partition types will fare in standard service conditions as they age. Analyzing slope magnitude is essential for gauging the durability of different partition types and planning maintenance and replacement schedules accordingly. Figure 5: Standard Condition Performance (SCP) Patterns of Gypsum Board Partitions: A comparative regression analysis of SCP over time across light, moderate, standard, and intensive occupancy conditions, with R-squared values indicating model fit. \begin{table}
\begin{tabular}{l c c c c c} \hline \hline  & **n** & **Average** & **S.D.** & **Min** & **Max** \\ \hline \multicolumn{6}{l}{**Hollow Concrete Blocks partitions**} \\ \hline Deviation from flatness & 41 & 87.8 & 12.94 & 60 & 100 \\ Deviation from Verticality/Horizontal & 41 & 89.63 & 10.51 & 70 & 100 \\ Tangible Interfaces & 41 & 100 & 0 & 100 & 100 \\ Intersection between the partition and exterior walls & 41 & 86.95 & 11.06 & 60 & 100 \\ Intersection between the partition and ceiling & 41 & 90.61 & 8.67 & 70 & 100 \\ ICP [\%] & 41 & 91.00 & 6.34 & 74 & 100 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: _Cont._The regression lines illustrate each sample's typical deterioration path (TDP). The deterioration paths are linear, indicating the consistent and sustained influence of the deterioration mechanisms across the examined partitions. As expected, it can be concluded that, in all samples, the deterioration process in standard service conditions intensifies with partition age. However, the deterioration rate differs for each sample. It should be noted that it was impossible to fit a regression line to the autoclaved aerated concrete block partition in light occupancy conditions due to a lack of observations (Figure 6). The deterioration rate of partitions made from hollow concrete blocks is found to be the most moderate rate, which reflects the material's durability and experience in constructing such partitions. In contrast, the degradation rate of gypsum board partitions is observed to be significantly higher, surpassing autoclaved aerated concrete block partitions in this respect. Additionally, clear differences can be discerned between the deterioration path characteristic of various levels of negative occupancy factors (\(\mu\)) within each sample; here, as expected, the deterioration rate of the path associated with intensive conditions (\(\mu>4\)) is the most accelerated, reaching up to 2.96 performance points per year in the gypsum board partition.