The types of wood in Banda Aceh used was seumantok, meranti, and sembarang wood. The process of wood leaves sawdust. The sawdust becames rubbish and could pollute the environment. There was five quality of woods, namely quality I - quality V. The purpose of this study is to optimize the sawdust of seumantok (quality I), meranti (quality II), and sembarang wood (quality III) to be processed into wood ash as a substitute for a part of cement in concrete with its percentage were 5% and 10%. The research method was experimentally in a laboratory-based on ASTM (American Society for Testing and Materials) and ACI (American Concrete Institute). The maximum diameter of the aggregate was 25.4 mm, and the compressive strength of concrete was 14.5 MPa with 21 specimens of cylindrical concrete. Concrete compressive strength results at 28 days with 5% wood ash variation and 10% respectively for quality I were 15.83 MPa and 14.20 MPa, quality II was 13.56 MPa and 12.75 MPa, and quality III were 13.79 MPa and 10.75 MPa. While the normal compressive strength of concrete was 15.86 MPa.

Waste collecting point is a communal waste management system with systematic sorting of waste at the source recommended by the Banda Aceh City Government to be applied to schools, namely the State Middle School 1 in Banda Aceh City. This study aims to determine the implementation of waste collecting points in an effort to overcome the problem of waste in schools. The method used in this study is the study of interviews, observations, research results, technical guidelines, journals, books, and government documents by analyzing data in a qualitative descriptive manner. The waste collecting point system is expected to be a system that will continue to be tested and developed through expert validation and limited testing. This system is useful for providing recommendations to schools in efforts to manage waste. Based on the results of the study that the implementation of waste collecting points as a waste management system has been running effectively but there are still several problems, namely the allocation of funds for the provision of facilities and infrastructure, garbage transport schedules, transportation officer errors, and lack of socialization by the city government.