Minangkabau traditional house is part of Indonesia's rich cultural asset with its historical and normative values. Beside custom homes, Minangkabau traditional building also serves as a place to stay in the context of human habitat but has slowly endangered its sustainability. The purpose of this study was to analyze the current physic conditions of this type of building by area. The study also aims to analyze the community participation in preserving this building in West Sumatra Indonesia. This is a quantitative study. Primary data was collected through a questionnaire survey. The total of this type of building amounts to 1,122. The study found that nearly 19.37% of traditional buildings are not occupied because of damages. In addition, there are influences of urbanization impact in urban community on the sustainability of the buildings. This research, suggested that the government should emphasize both maintenance and protection of traditional buildings by establishing policies in view of sustainable development planning.

The quality of an aggregate in a concrete mixture is one of the factors that affect the quality of the concrete. Geographically, Payakumbuh City and District 50 cities are passed by several rivers where the river's products are used by the local community as building material. This research uses a quantitative approach, the research method uses experiment. The results of this study found that the average compressive strength of normal fc concrete was 19.3 Mpa at the age of 14 days using coarse aggregate from Halaban river, the compressive strength value was 21.68 Mpa. The average compressive strength of normal concrete using the coarse aggregate mixture of Halaban and Bukik Limbuku river is 20.98 MPa and the average compressive strength of normal concrete using a mixture of coarse aggregate Halaban and Batang Agam river is 20.35 Mpa. The conclusion of this study is that coarse aggregate from Bukik Limbuku and Batang Agam river, although the quality of the gradation not include in the SNI standart, but after mixing the coarse aggregate from Halaban - Limbuku and Halaban - Batang Agam, the compressive strength more than fc. '19.3 Mpa.Keywords: Material, Concrete Quality, Compressive Strength, Gradation.