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This paper will be based on a joint Vietnamese-Dutch co-operation program dealing with sustainable developments. This implies optimum use of indigenous raw materials, of mineral by-products, and of waste components. It asks for reducing energy consumption and diminishing environmental pollution. This is of economic interest, of course, but it contributes also significantly to more controlled use of precious raw materials, to waste management, to energy conservation and to environmental protection. The latter, of course, has its impact on health protection. This strategy for sustainable development is also receiving an increasing priority in industrialized countries nowadays. The research programme on which will be reported focuses on the developments in Northern Vietnam, and is concerned with selecting local sand and gravel for mix proportioning, leading to gap-graded mixtures encompassing very fine sand …