D. Okpala

Palm kernel shell as a lightweight aggregate in concrete

D. C. Okpala, D. Okpala, 1990 .

Evaluation and selection of construction projects in Nigeria

D. Okpala, 1991 .

Pore structure of hardened cement paste and mortar

D. Okpala, 1989 .

Effects of microwave power and slice thickness on fiber and ash contents of dried sweet potato (Ipomoea batata)

D. Okpala, C. Nwajinka, D. Amaefule, 2020 .

Strength characteristics of medium workability ordinary Portland cement-rice husk ash concrete

D. Okpala, A. Ikpong, 1992 .

Causes of High Costs of Construction in Nigeria

Daniel C. Okpala, Anny N. Aniekwu, D. Okpala, 1988 .