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This research aims to analyze the compatibility of the sea sand export policy, as outlined in Government Regulation No. 26 of 2023 and its implementing regulations in Minister of Trade Regulations No. 20 and 21, with the principles of ecological justice. The research is driven by concerns over the ecological impacts of sea sand exploitation and the potential conflict between economic interests and environmental protection. Using a normative juridical approach and analysis of prevailing laws and regulations, the study finds that the current regulatory framework does not fully reflect the principles of ecological justice. The policy fails to ensure equitable protection for coastal communities and the marine environment. Government Regulation No. 26/2023 does not explicitly mandate Environmental Impact Assessments (AMDAL), does not emphasize conservation as a fundamental principle, and allows room for exploitation in vulnerable coastal and small island areas. Moreover, historical data reveals that similar policies in the past have led to coastal erosion, the loss of outermost islands, and state losses due to illegal practices. Therefore, without proper reassessment and alignment with environmental justice principles, this policy risks exacerbating ecological inequalities.

The United Nations and the World Meteorological Organisation predict that around 5 billion people will lack clean water and even drinking water (Source: Conference on Our World in Concrete and Structure in Singapore). Based on the aforementioned phenomenon, given the abundant potential of seawater resources, there is an idea to use seawater as a concrete admixture, especially in building locations that often interact with seawater. Research is carried out in an effort to find alternatives to improve the mechanical properties of concrete such as compressive strength values, split tensile strength, namely by using additives as self-compacting concrete technology and making seawater and sea sand as a substitute for fresh water and river sand

East Nusa Tenggara Province in managing the Coastal area in East Nusa Tenggara in Community participation in environmental protection and management efforts in East Lembur Village, Lembur District is still relatively low because not all communities play a role in the planning, implementation, utilization and evaluation stages in the context of environmental protection and management efforts. that the management of coastal areas must have permission from the local government and if carried out illegally, it can be subject to strict sanctions. The research method used in this study is empirical juridic research. Empirical legal research that focuses on behaviors that are embraced or developed in society. This behavior is accepted and appreciated by the community because it is not prohibited by statute law, does not contradict the morals of the community (social ethics). The results of this study show that the Criminal Law Regulation Related to Sea Sand Mining Based on Law No. 32 of 2024 Jo. Law No. 5 of 1990 Law Number 32 of 2024 concerning Amendments to Law Number 5 of 1990 provides a stronger legal framework for the management and protection of natural resources, including sea sand mining. The Coastal Rights Law refers to regulations and policies that regulate the utilization, management, and protection of coastal areas and the rights of the people living around them.  that the people in East Lembur Village have several factors that cause why they are still doing illegal sand mining. One of the negative aspects is the implementation of mining activities that are not in accordance with existing regulations, such as illegal or unlicensed mining. Both on a large and small scale, mining activities require official permits, because their implementation without a permit can result in legal consequences that need to be accounted for.

Indonesia is an area rich in sea sand. The aim of this research is to determine the comparison of the compressive strength of mortar derived from sea sand and river sand, as well as the feasibility of using sea sand as a material in construction in coastal areas. The results of the research showed that the compressive strength of the mortar from the two materials tested at 28 days had a difference in compressive strength of up to 37.45%, the mortar made from sea sand aggregate produced a mortar compressive strength of 14.13 Mpa which can be categorized as type S mortar with minimum value 12.5 MPa, meanwhile, mortar made from fine river sand aggregate produces a mortar compressive strength of 22.59 MPa and is included in the type M mortar category which has a minimum value of 17.2 Mpa.  

The availability of sea sand on the beach of Ujung Tape Pinrang is in very large quantities that can be used as materials in making concrete. The purpose of the study is to analyze the characteristics of beach sand, compressive strength and tensile strength produced. An experimental research method in the Civil Engineering Laboratory, University of Muhammadiyah Parepare with a treatment system for ordinary water immersion and analysis of the characteristics of concrete mechanical properties using a compression machine test. The results of the study at the maintenance age of 28 days with a planned compressive strength of 20 MPa produced a compressive strength of 28.29 MPa and a tensile strength of 7.78 MPa, a planned compressive strength of 24 MPa resulted in a compressive strength of 29.98 MPa and a tensile strength of 8.22 MPa, and a planned compressive strength of 28 MPa produces a compressive strength of 31.40 MPa and a tensile strength of 8.44 MPa. The results of the study on compressive strength and tensile strength showed an increase in each increase in planned compressive strength.

The use of sea sand in construction work from an economic point of view does have advantages. One of them is increasing the income of the sea sand collectors who are spread throughout the area in Fakfak Regency. In addition, the potential availability of sea sand is quite large and is able to accommodate all types of concrete construction work in this area. This study aims to determine and analyze the use of sea sand in the AC-WC mixture of course by doing the Marshall test. This study uses variations in asphalt content of 5.0%, 5.5%, 6.0%, 6.5% and 7.0%, this study was carried out using Marshall testing in accordance with the general specifications of Bina Marga 2018. The results of the research conducted showed a relationship asphalt content and Marshall parameters such as stability value, VMA, density, MQ at an asphalt content of 5.0%-7.0%, meet the specifications of 1932 kg, 19.84%, 2.26 gr/cm3 and 1031 kg/mm. Values of VIM, VFWA and flow at 5.5% asphalt content are known to not meet the mix spasticity, namely 8.07%, 59.71% and 1.67 mm. Based on the Marshall parameter data, the Optimum Asphalt Content value is 6.5%.