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Harahap, Mukti Hamjah and Ritonga, Winsyahputra and Irfandi and Zubir, Moondra (2022) OPTIMIZATION OF RED SAND PARTICLE SIZE AND COMPOSITION IN MIXTURE WITH ORDINARY SAND TO ENHANCE CONCRETE QUALITY. Sciendo : Civil and Environmental Engineering, 18 (2). pp. 424-429. ISSN 2199-6512