Cement production contributes significantly to CO₂ emissions, which can be mitigated using supplementary cementitious materials (SCMs). Agro-industrial byproducts can serve as SCMs to reduce CO₂ emissions. One such material is sugarcane bagasse ash (SCBA), known for its high silica content. The efficiency of SCBA can be further improved by combining it with alccofine (AF), but their interactions in cement paste are not fully understood. This research investigates the physical and mechanical characteristics of cement paste containing various proportions of unmodified SCBA (USBA) and AF. The study examined 28 mixtures using two chemical admixture dosages. USBA was refined by sieving through a No. 30 sieve. Paste formulations included binary mixtures with partial cement substitution by USBA or AF, and ternary blends with both materials. Higher chemical admixture content improved compressive strength, especially in ternary pastes with 20% and 30% USBA. Mixtures with 0.6% admixture exhibited lower consistency values than those with 0.4% dosage. USBA mixtures benefited more from 0.4% admixture dosage.