COMBINATION OF PALM KERNEL HUSK ASH (PKHA) AND FREE LIME (CaO) AS AN ADMIXTURE IN CONCRETE PRODUCTION Am. Nigerian Journal of Technology, [S. l.], v. 30, n. 1, p. 64–71, 2009. DOI: 10.4314/njt.301.51. Disponível em: https://nijotech.com/index.php/nijotech/article/view/51. Acesso em: 15 apr. 2026.