## 5 Conclusions  
This paper investigated the fresh and mechanical properties of high-strength self-compacting concrete reinforced with twisted-bundle macro-synthetic fibers, and proposed a theoretical model to predict the ultimate flexural strength of synthetic fiber reinforced SCC. The main findings of this work are as follow:  
* The inclusion of fibers up to 6 kg/m\({}^{3}\) did not affect the flowabilty of the self-compacting concrete. The mixture containing 8 kg/m\({}^{3}\) presented reduced flowability and would require further mixture design improvements in order to achieve the desirable self-compacting properties for precast applications;
* The mixture with a dosage of 6 kg/m\({}^{3}\) exhibited the highest compressive and tensile strength. However, when flexural and post-cracking performances were assessed, the mixture with 8 kg/m\({}^{3}\) revealed improved flexural performance compared to lower fiber dosages, evidencing the contribution of higher fiber contents in the post-cracking composite performance;
* Based on the post-cracking behavior, a modified stress-crack opening constitutive law was proposed, including fiber dosage as a model parameter. This model predicts the moment capacity of FRC beams by using the split tensile strength of FRC and a coefficient correlated to fiber content/dosage. The model also corroborates the conclusion that the highest fiber content of 8 kg/m\({}^{3}\) results in a higher moment carrying capacity.
* The model is an initial approach on the development of a theoretical model to predict the ultimate flexural strength of synthetic fiber-reinforced SCC based on split tensile strength only, without relying on notch beam flexural test and is capable of predicting the flexural strength of FRC beam.  
Conceptualization, E.O.G. and A.M.; methodology, E.O.G.; formal analysis, M.I.K., K.G., and M.S.; validation, K.G. and M.S.; investigation, E.O.G. and A.M.; writing--original draft preparation, M.I.K. and M.S.; writing--review and editing, E.O.G.; funding acquisition, E.O.G.  
This research received external funding from the Innovation Connection Scheme, Australian Government, and Holmes Nominees (AUST) PTY LTD.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Mixture** & **Samples** & \begin{tabular}{c} _P\({}_{u,exp}\)_ \\ **(kN)** \\ \end{tabular} & \begin{tabular}{c} _M\({}_{u,exp}\)_ \\ **(kN.m)** \\ \end{tabular} & \begin{tabular}{c} _M\({}_{u,theo,1}\)_ \\ **(kN.m)** \\ \end{tabular} & \begin{tabular}{c} _M\({}_{u,theo,2}\)_ \\ **(kN.m)** \\ \end{tabular} & \
\begin{tabular}{c} _M\({}_{u,theo,2}\)_ \\ **(kN.m)** \\ \end{tabular} &
\begin{tabular}{c} _M\({}_{u,theo,2}\)_ \\ **(kN.m)** \\ \end{tabular} \\ \hline
**FF4** & \begin{tabular}{c} **S1** \\ **S2** \\ **S3** \\ **S4** \\ \end{tabular} & \begin{tabular}{c} 16.12 \\ 16.32 \\ 17.44 \\ 15.59 \\ 18.75 \\ 18.48 \\ 17.52 \\ 17.52 \\ 15.64 \\ 15.60 \\ \end{tabular} & \begin{tabular}{c} 2.02 \\ 2.04 \\ 2.04 \\ 2.04 \\ 1.95 \\ 18.88 \\ 18.88 \\ 17.52 \\ 1.88 \\ 1.96 \\ 1.88 \\ 1.88 \\ 1.87 \\ 1.87 \\ 1.87 \\ 1.74 \\ 1.74 \\ 1.36 \\ \end{tabular} & \begin{tabular}{c} 0.65 \\ **3.12** \\ **1.17** \\ **1.17** \\ **1.25** \\ **1.07** \\ **1.06** \\ **1.15** \\ \end{tabular} & \
\begin{tabular}{c} **3.12** \\ **1.17** \\ **1.25** \\ **1.07** \\ **1.06** \\ **1.15** \\ \end{tabular} &
\begin{tabular}{c} **1.16** \\ **1.17** \\ **1.25** \\ **1.07** \\ **1.06** \\ **1.15** \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}
Table 9: Experimental and theoretical moment capacity of twisted-bundle macro-synthetic fiber reinforced SCC samples.  
**Acknowledgments:** The authors would like to thank [PERSON] for his support during the experimental tests; Local Mixture, Geelong for preparing the mixtures; and Geelong Concrete for preparing the samples.  
**Conflicts of Interest:** The authors declare no conflict of interest.