## 4 Results and Discussion
### Economical Comparison of Materials Used  
In this study, the use of latex was reduced to improve the strength development, roller compaction method and economic efficiency of the materials used with the latex addition of RCLMFRRHCC. The latex was reduced from 15% to 10% by weight of cement. To reduce the durability due to the decrease in the latex usage and to secure the applicable slump of the roller-compacting method, reinforcing fibers were applied. In this study, the cost of input materials was compared and analyzed. The costs of the materials used in this study are shown in Table 7. The cost of the material was provided by the manufacturer. At this time, coarse aggregate, fine aggregate and water were excluded because the same amount was applied. The comparative mix was compared with the addition of 15% of latex. Table 8 shows the comparison results. Figure 13 compares the economics of the cost of latex and reinforcing fibers for the same amount of rapid set  
* As a result of the slump test, the slump of 40 mm or less for applying the roller compaction method could be satisfied by adding the fiber. Therefore, it is difficult to apply the roller compaction method without mixing the fiber. * In compressive strength tests, all mixes showed results satisfying the traffic open standard curing at 4 h of \(\geq\)21 MPa and curing for 28 days of \(\geq\)35 MPa. The mixes using reinforcement fibers showed outstanding compressive strength. The macro synthetic fiber, used as a structural fiber, showed better results than those of natural jute fibers and PVA fibers, which are non-structural fibers. * In flexural strength tests, all mixes satisfied the strength condition of \(\geq\)3.5 MPa after 4 h of curing and \(\geq\)4.5 MPa after 28 days of curing. The macro synthetic fiber, a structural fiber, showed better results than using the natural jute fiber and PVA fiber (non-structural fibers). * In the splitting tensile strength results, all mixes satisfied the target of 4.2 MPa after curing for 28 days. Regarding the influence of the fiber reinforcement materials, the macro synthetic fiber showed better results than using natural jute fibers or PVA fibers. * From chloride ion penetration test results, mixes with reinforcement fibers showed a decreased chloride ion penetration. All mixes satisfied the target standard of \(\leq\)2000 Coulombs after curing for 28 days. However, in the case of a curing period of 4 h, the mix without reinforcing fibers showed a value of 4000 or more and showed high permeability. The mixture with the reinforcing fibers shows moderate permeability. * The resistance of permeability was improved compared to that without fiber reinforcement. * In abrasion test results, mixes with reinforcement fibers showed increased abrasion resistance. The influence of the reinforcement fiber type was not significant. * In the impact test results, mixes with reinforcement fibers showed increased impact resistance. The mix using macro synthetic fibers showed better resistance against impact than mixes with natural jute fiber and PVA fiber. * In this study, considering the strength, permeability and durability, the fiber that was most effective in improving the performance of RCLMFRHCC was the macro synthetic fiber. * Furthermore, as a result of this study, RCLMFRHCC can be applied to emergency repair of concrete pavement, as it can improve the economic efficiency by reducing the amount of latex used in addition to satisfying the target performance and improving the durability of concrete pavement. * Cost analysis of materials, excluding rapid-hardening cement, found that the mixtures with 5% latex and fiber reduce 60-63% of material costs compared with 15% latex. Therefore, it is possible to reduce the use of latex as well as to use a roller-compacting method by using reinforcing fibers. This work was supported by the research grant of the Kongju National University in 2016.