is study assessed the mechanical properties and durability of latex-modified fiber-reinforced segment concrete (polyolefinbased macrosynthetic fibers and hybrid fiber-macrosynthetic fiber and polypropylene fiber) for a tunnel liner application. e tested macrosynthetic fiber-reinforced concrete has a better strength than steel fiber-reinforced concrete. e tested concrete with blast furnace slag has a higher chloride ion penetration resistance (less permeable), but its compressive and flexural strengths can be reduced with blast furnace slag content increase. Also, the hybrid fiber-reinforced concrete has higher compressive strength, flexural strength, chloride ion water permeability resistance, impact resistance, and abrasion resistance than the macrosynthetic fiber-reinforced concrete. e modified fiber improved the performance of concrete, and the hybrid fiber was found to control the formation of micro-and macrocracks more effectively. erefore, overall performance of the hybrid fiber-reinforced concrete was found superior to the other fiber-reinforced concrete mixes tested for this study. e test results also indicated that macrosynthetic fiber could replace the steel fiber as a concrete reinforcement.

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For agricultural water management to be successfully achieved, flow analysis of irrigation canal network flows is essential to determine the proper distribution of crop water requirements and to contribute to an optimized irrigation operation and water allocation. This study developed a hydraulic analysis model for irrigation canal flow by using the Storm Water Management Model (SWMM) module by adding the network modelling and paddy water balance model. This model was applied to a rice paddy field rehabilitation project area in the Daesan District located in the western part of South Korea. Results obtained from the calibrated simulation model were compared with the actual measurement data from water-level gauges at the irrigation canals. The irrigation hydraulic analysis model for canal network flow indicates the significance of using irrigation management tools in improving the analysis for accurate irrigation scheduling based on its simulation results, such as flow travel time, water level and flow amount. ABSTRACTPour la réalisation réussie de la gestion de l'eau agricole, il est essentiel d'analyser les écoulements dans les canaux d'irrigation, afin d'optimiser le fonctionnement du système d'irrigation et d'améliorer l'allocation de l'eau en fonction de la répartition des cultures. Cette étude a élaboré un modèle d'analyse hydraulique de l'écoulement des canaux d'irrigation en ajoutant la modélisation en réseau et un modèle de bilan hydrique du riz à un module du modèle de gestion des eaux pluviales (SWMM). Ce modèle a été appliqué à une rizière en réhabilitation dans le district de Daesan (ouest de la Corée du Sud). Les résultats obtenus après calibrage du modèle ont été comparés pour validation avec les données de jaugeage dans les canaux d'irrigation. Le modèle d'analyse hydraulique des flux de réseau de canaux d'irrigation montre l'importance d'utiliser des outils de gestion de l'irrigation pour améliorer la planification de l'irrigation en se basant sur des résultats de simulation, tels que le temps de transit, le niveau de l'eau et le flux.mots clés: gestion de l'eau agricole; modèle hydraulique; canal d'irrigation; modélisation du réseau; SWMM (modèle de gestion des eaux pluviales)

is study evaluated the influence of reinforcement fiber type and microsilica content on the performance of latex-modified fiberreinforced roller-compacted rapid-hardening cement concrete (LMFRCRSC) for a concrete pavement emergency repair. Experimental variables were the microsilica substitution ratio (1, 2, 3, and 4%), and the reinforcement fiber (jute versus macrosynthetic fiber). In the tests, compressive, flexural, and splitting tensile strength; chloride ion penetration resistance; and abrasion resistance were assessed. From the compressive and flexural strength tests with microsilica substitution, the 4-hour curing strength decreased as the microsilica substitution ratio increased. From the chloride ion penetration test, as the microsilica substitution ratio increased, chloride ion penetration decreased. e abrasion resistances increased with the substitution ratio of microsilica increase. Based on these test results, microsilica at a substitution ratio of 3% or less and macrosynthetic fiber as the reinforcement improved the performance of LMFRCRSC for a concrete pavement emergency repair and satisfied all of the target strength requirements.

Saemangeum development project is the world's largest tidal flat reclamation project. It is currently under construction, and proceeding with phased developments. The construction of agricultural areas within the Saemangeum reclamed lands is also a part of this project. These areas will have multi-functional complexes aiming to produce mainly eco-friendly horticultural crops and livestock products for the purpose of export. The major concern is to obtain sufficient water with appropriate quality to supply to those areas. The objective of this study is therefore to provide available water supply plans for agricultural purpose, especially for horticulture and livestock complexes. Alternative methods for water supply are purifying water from the Saemangenm lake or using water supply services providing by K-water or local governments. This study investigates to find an economical water supply plan through comparisons of these methods. As a result, the water purification method with Saemangeum lake water could be advantageous for given water supply conditions to horticulture and livestock complexes.