How can I write research problem for this research proposal calcium carbide waste and guinea corn husk ash as partial replacement for cement

Probably help if you had data to present your case. Do the work and present the FACTS you have found.

This is why buildings and bridges in 3rd world countries are always collapsing. Substituting or diluting REAL building materials for garbage to the extent they fall down for no reason at all, or in situations no damage should have occurred.