(Reuse of algaroba wood ash as an alternative limestone filler in the development of LC ³ cement)

Abstract

The incorporation of alternative materials in partial replacement of clinker is studied to reduce the CO₂ emissions that occur in the production of Portland cement. The influence of using mesquite ash as an alternative filler in LC³ cement pastes was analyzed. The alkali content of the system was adjusted by washing the ash, thus reducing the potassium content. The filler was replaced at 0, 25%, 50%, 75%, and 100% washed ash, and the same for unwashed ash. Subsulfation was corrected by adding an extra gypsum percentage. Paste performance was assessed by rheology and compressive strength, supported by hydration kinetics and microstructural development. Mesquite ash is a potential alternative filler for application in LC³. Washed ash makes the system purer, contributing to hydration and mechanical performance, however, natural ash also brings promising results.

Keywords:
algaroba; calcined clay and limestone cement; limestone filler; residue