single and mixed sized aggregates in sandcrete block . - CI Premier10mm, 15mm and mixed coarse aggregate in varying proportions can be used for load bearing . Blocks made from a mixture of river sand, cement and water are called “sandcrete” blocks. They are used . The situation in. Nigeria has since changed as the Standards Organization of Nigeria now has specifications for both.standard ratio of cement and sand mixture for block moulding in ghana,sandcrete block and brick production in nigeria - Covenant Universityuse of a vibrating machine for large scale production and hand mold for small scale production. Baiden and Tuuli (2004) added that the type of hollow sandcrete blocks commonly produced and used for construction of buildings in Nigeria are made of a standard mix proportion of 1:6 cement-sand ratio; that is, one part by.