## 3 Results
### Assessment of the Extent of the Defects and Relation to Production Aspects  
Two different teams of concrete workers each with their own supervisors, from two different subcontractors, were in charge of the on-site construction work for the gravity-based foundations. The two different teams are hereafter referred to as Team A and Team B. Table 3 summarizes the average time required to build a foundation and the average defect indexes for the foundations built by each team. The average time required for the casting of concrete for a gravity-based foundation was 15.6 h. Team B worked significantly faster than team A, requiring on average 2 h 24 min less. Team B also achieved the best overall  
Figure 8: Concrete cover measures on the inclined surface and crack patterns on the horizontal pedestal surface. Figure 9: Cores vertically drilled from the foundations: (**a**) core drilled on the inclined surface at a plastic settlement crack, and (**b**) core drilled on the pedestal. quality for the foundations with a general defect index of 4.3 on average, i.e., 33% lower than Team A. This trend was observed both for the cracking defects (crack index 22% lower for Team B) and for the reinforcement and casting defects (index 61% lower for Team B). Figure 10 shows the evolution of the casting time for the foundations built by Team A and Team B, respectively. As illustrated on this graph, the works were first conducted by Team A and then by Team B. Three distinct construction groups can be identified: the first two for foundations built by Team A separated in time by an interruption of several months since no work was conducted during the colder winter months, and the third one for foundations built by Team B. Remarkably, the first foundation built in each of these three groups took significantly longer times than the following ones. There is a marked decreasing trend over time for the second group of foundations built by Team A and the third group built by Team B, while it is less clear for the foundations from the first group of Team A. When analysing the evolution of the general defect index over time, as shown in Figure 11, a clear decreasing trend can be observed for the third group built by Team B, while the trend is less clear for the two first groups built by Team A, where both the lowest and highest defect indexes are observed in the first foundations in each of these groups, followed by quite constant indexes for the subsequently built foundations. \begin{table}
\begin{tabular}{c c c c c} \hline \multirow{2}{*}{**Production Team**} & \multirow{2}{*}{**Number of Foundations (-)**} & \multicolumn{2}{c}{**Average Time per**} & \multirow{2}{*}{**General**} & \multirow{2}{*}{**Crack Index (-)**} & \multirow{2}{*}{**Reinforcement**} \\  & & **Foundation for** & & & **and Casting** \\  & & **Concrete Works (h)** & & & **Defect Index (-)** \\ \hline All & 23 & 15.6 & 5.8 & 4.2 & 1.6 \\ Team A & 13 & 16.6 & 6.7 & 4.6 & 2.1 \\ Team B & 10 & 14.2 & 4.5 & 3.6 & 0.9 \\ \hline \end{tabular}
\end{table} 
Table 3: Production time per foundation and defect index for each production team. Figure 10: Relation between the time required for casting the foundation and their production date. The correlations between the weather conditions, and the casting time and extent of defects, respectively, were also investigated. As shown in Table 4, the average time per foundation was 15 h 36 min for all foundations, which was 12 min shorter on average for foundations cast under rainy or snowy conditions. The difference observed in terms of defects is more significant, as it is equal to 4.8 for foundations cast under rain or snowy conditions and 6.1 for foundations cast under conditions without precipitations.