The current chapter $3$ is too weak. The main content of this chapter should talk about research philosophy, how to get data$/$information and how to analyse the data$/$information$.$ As you can't do test, so the method you used to collect data$/$information will be desk study. so$,$ you need to find experimental data from references and then analyse that data$/$information$.$ The ethics section should talk about how use$/$protect data$/$information$,$ research integrity$/$honestness etc. You can google search to find useful information to learn and to strengthen this chapter. About DEVELOPMENT OF SUSTAINABLE CONCRETE BY USING REUSED$/$RECLYCLED AGGREGATES. Concentrate more in reclycled aggregates than concrete itself.