Kuat tekan beton awal tinggi saat ini dibutuhkan untuk mempercepat pekerjaan, namun komposisi yang optimal dan bahan yang tepat belum ditemukan. Selain itu limbah beton hasil uji yang melimpah dapat digunakan sebagai substitusi agregat kasar, namun dapat mengurangi kuat tekan, maka digunakan silica fume yang dapat meningkatkan nilai kuat tekan. Penggunaan superplasticizer mengurangi workability beton segar, maka ditambahkan bahan admixtures seperti superplasticizer. Tujuan penelitian ini yakni guna memahami nilai slump, kuat tekan beton, absorpsi, dan persentase peningkatan kuat tekan awal dengan penggunaan silica fume (0%, 5%, 10%, 15%) sebagai substitusi semen dan limbah beton yang menjadi bahan pengganti agregat kasar sejumlah 25%, serta superplasticizer sebesar 1% dari berat semen. Pada beton normal dan variasi 1 hingga 4, nilai kuat tekan di umur 28 hari berurutan yaitu 25,370 MPa; 26,125 MPa; 26,597 MPa; 27,634 MPa; dan 29,520 MPa. Hasil maksimum diperoleh pada variasi 4 dengan komposisi 15% silica fume, 1% superplasticizer, dan 25% limbah beton, mencapai kuat tekan 29,520 MPa, absorpsi 4,192%, slump 5,58 cm, serta peningkatan kuat tekan awal sebesar 47,110% pada umur 3 hari.

High early compressive strength of concrete is currently needed to accelerate construction work. However, the optimal composition and appropriate materials have not yet been determined. Additionally, the abundant waste concrete from testing could be used as a substitution for coarse aggregates, but it may reduce compressive strength. To counteract this, addition of silica fume was done to increase compressive strength. The use of superplasticizers reduces the workability of fresh concrete, so admixtures like superplasticizers are added. The aim of this research is to determine the slump value, compressive strength of concrete, absorption, and the percentage increase in early compressive strength with the use of silica fume (0%, 5%, 10%, 15%) as a substitute for cement and waste concrete as a replacement for coarse aggregate at 25%, along with a superplasticizer at 1% of the cement weight. In normal concrete and variations 1 to 4, the compressive strengths at 28 days were 25.370 MPa, 26.125 MPa, 26.597 MPa, 27.634 MPa, and 29.520 MPa, respectively. The maximum result was obtained in variation 4, with a composition of 15% silica fume, 1% superplasticizer, and 25% waste concrete, achieving a compressive strength of 29.520 MPa, absorption of 4.192%, slump of 5.58 cm, and an increase in early compressive strength of 47.110% at 3 days.