## 4 Conclusions  
In this experimental investigation, the behavior of single-bonded anchors with inorganic adhesive mortar subjected to a monotonic tensile loading under ambient and high-temperature conditions was studied considering two embedment depths: 75 mm and 125 mm. In addition to the ISO 834-1 fire, slow-rate heating was also considered to analyze the effect of different temperature conditions. One main specificity of this investigation is that the test setup allowed performing the tests at high temperature without a cooling phase. Four of the seven tests performed at high temperature resulted in a clear concrete cone failure. The ultimate load obtained in those tests broadens the existing database for the concrete cone capacity of anchors at high temperature, which does not currently include the capacity of bonded anchors. The following main findings can be reported based on the experimental results:  
* With the slow-rate heating, the temperature of the mortar was higher than that of concrete at a similar depth, but the thermal gradient along the whole depth was more pronounced in the concrete than in the mortar. For a similar exposure time, the 75 mm anchors experienced concrete cone failure, while the 125 mm anchors experienced a combined failure. Moreover, the loss of capacity due to the thermal load was more important for the 125 mm anchors, as it combined a loss of concrete cone capacity and a loss of bond strength of the mortar. * With the ISO 834-1 fire conditions, considerably higher temperatures were reached in concrete at the exposed surface compared to the case with the slow-rate heating, but the thermal gradient was also more pronounced, hence the temperature of concrete at embedment depth was lower than with the slow-rate heating. When increasing exposure time, the failure mode of the 125 mm anchors changed from clear concrete cone failure to a combined failure. * The analysis of temperature distributions suggests that not only the temperature of the mortar controls the change of failure mode between a clear concrete cone failure and a combined failure, but also the temperature of concrete over the entire embedment depth. * In all tests, the slope of the cone-shaped failure surface varied along the crack path and around the circumference of the cone and flattened when reaching the surface of the slab. The temperature did not have a significant influence on this slope before the \begin{table}
\begin{tabular}{c c c c c c} \hline
**Test Condition** & **Test ID** & **Failure Mode** & **F\({}_{\text{val}}\) (RN)** & **Loss of Capacity** & **Equation (1)** \\ \hline \hline \multirow{8}{*}{**Ambient temperature**} & 75-1 & Concrete cone & 43.4 & \multirow{8}{*}{**Loss of Capacity**} & \multirow{8}{*}{**Equation (1)**} \\  & 75-2 & Concrete cone & 44.0 & & \\  & 75-3 & Concrete cone & 41.4 & & \\  & 75-4 & Concrete cone & 44.0 & & \\  & 125-1 & Concrete cone + pull-out & 111.0 & & \\  & 125-2 & Concrete cone + pull-out & 126.5 & & \\  & 125-3 & Concrete cone + pull-out & 96.9 & & \\  & 125-4 & Concrete cone + pull-out & 108.8 & & \\  & 125-5 & Concrete cone + pull-out & 100.3 & & \\ \hline \multirow{2}{*}{**Slow-rate heating**} & 75-1 & Concrete cone & 31.1 & 28\% & \\  & 175-2 & Concrete cone & 28.4 & 34\% & \\  & 125-1 & Concrete cone + pull-out & 40.3 & 62\% & \\  & 125-2 & Concrete layer + pull-out & 38.3 & 65\% & \\ \hline \multirow{2}{*}{**Fire ISO 834-1**} & 125-ISO-30 & Concrete cone & 54.7 & 50\% & 30.08 \\  & 125-ISO-60 & Concrete cone & 46.2 & 57\% & 30.08 \\ \cline{1-1}  & 125-ISO-75 & Concrete cone + pull-out & 44.9 & 59\% & 30.08 \\ \hline \end{tabular}
\end{table} 
Table 4: Ultimate loads and loss of capacity due to fire. flattening. However, in the tests with ISO 834-1 fire conditions, the base radius of the cone at the exposed surface reached up to 5.5:h\({}_{\rm ef}\). * The displacement of an anchor after thermal exposure is not predictable based on the present results because each anchor behaved differently after a linear load-displacement relationship at the beginning of the loading.