## 4 Conclusions  
In this study, we examine the effects of flexible PVA fiber reinforcement on low-strength hydraulic lime concrete under both quasi-static and dynamic conditions. The research involves prismatic specimens with varying polyvinyl alcohol fiber contents, subjected to three-point bending tests. In both hydraulic lime concretes (with and without PVA fibers), the fresh state characterization revealed a soft consistency in the Abrams cone test, aligning with the design goal. Relatively low fresh state density values were observed, possibly attributed to a high content of entrapped air.  
Concerning the quasi-static mechanical characterization, the expected compressive strength value was achieved in all cases, aligned with the initially established \(w/\ell\) ratio in the mix design. The compressive strength increased with the rise in fiber content, showcasing a substantial enhancement in low-strength concrete. The modulus of elasticity exhibited variability, generally decreasing with fiber inclusion, except for \(\phi_{f}\) = 0.9%. An optimal fiber volume fraction (\(\phi_{f}\) = 0.9%) was identified for maximum flexural strengths in the quasi-static regime, beyond which a reduction occurred.  
Dynamic fracture tests demonstrated increased flexural strength parameters as fiber volume fraction increased. Residual flexural strengths (\(\sigma_{R1}\), \(\sigma_{R2}\), \(\sigma_{R3}\), \(\sigma_{R4}\)) in the dynamic regime consistently grew with augmented \(\phi_{f}\), with constant growth rates. The stress-crack opening curves in three-point bending tests revealed enhanced energy absorption capacity and ductility in the dynamic regime, emphasizing the effectiveness of fiber-matrix interaction.  
An increase in flexural strength, residual flexural strengths, and work of fracture is observed with higher fiber content in both regimes. Transitioning between regimes significantly enhances these mechanical properties. Post-mortem analysis confirmed intergranular fracture and effective fiber-matrix interaction, primarily through fiber pullout failure. This interaction facilitated the development of energy absorption capacity and ductility in the post-peak load range.  
The study highlights the suitability of discontinuous PVA fiber reinforcement in lime concretes under specific dynamic loading conditions. The results offer valuable insights for optimizing fiber content to improve mechanical properties and fracture strength in lime concretes. The composite material exhibits significant ductility and energy absorption capacity, rendering it a promising alternative for various applications including restoration, rehabilitation, and new construction projects.  
A.D.L.R.: Conceptualization, writing--original draft preparation and review and editing, methodology, experimental results and validation. L.G.: Conceptualization, writing--review and editing, methodology, validation. V.W.M.: Writing--review and editing, experimental results. G.R.: Conceptualization, writing--review and editing, methodology, validation, resources. All authors have read and agreed to the published version of the manuscript.  
This research received funding from the Universidad de Castilla-La Mancha, Spain, jointly with the Fondo Europeo de Desarrollo Regional through grant 2022-GRIN-34124, and from the Ministerio de Ciencia e Innovacion, Spain, through grants PID2019-110928 RB-C31 and PID20201-124521 OB-I00.  
Not applicable.  
Data Availability Statement: Data will be made available on request.  
The authors acknowledge the free supply of raw materials provided by Master Builders Solutions.  
The authors declare no conflicts of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.