This paper discusses the comparison between national contract standards (Presidential decree, the Minister of PUPR Regulation) and international standards that refer to FIDIC. In this study, an analysis carried out on the rights and obligations of service users and service providers, the legal aspects of contracts that refer to national and international standards (FIDIC). The method used is a literature study consists of three documents (Presidential decree, Ministry of Public Works, and FIDIC). The analysis shows that national contract standards (Presidential decree) and FIDIC international standards have similar regulations in many items. Finally, compared to the ministry of the public works contract document, the FIDIC document standard is more effective to use because the contractor has fair and balanced requirements, and accommodates the possibility of unwanted disputes in the future.

Concrete is a material that is widely used in construction. Concrete research efforts are ongoing and through a series of experimental tests. On the other hand, experimental tests require a lot of money, take a long time, and create waste. Several studies have revealed that numerical testing can accurately test concrete to fractures. However, modeling for the four-point load flexure test pattern is still not widely discussed. This study aimed to model the four-point flexural test of concrete using the discrete element method (DEM) approach. Sieve gradation was performed to determine particle size, and flexure testing was performed to calibrate the DEM model. DEM flexure testing was made using Yet Another Dynamic Engine (YADE) software with ASTM D6272 reference and beam dimensions 105 x 105 x 535 mm. The cohesive contact model with spherical particles is used, and the algorithm developed modifies the faceted sphere of interaction. The study results revealed that DEM can simulate crack behavior in flexural testing of unreinforced concrete. The DEM results show only a 2.13% difference in the experimental results of the flexural strength test. Meanwhile, crack behavior can be observed directly in the DEM simulation. The results of this study can be used to predict the failure pattern of the flexural test structure and to design the right proportion of the mixture to match the desired flexural strength. So that material efficiency and concrete flexure testing time can be achieved.