MIX DESIGN PROPOSAL FOR STRUCTURAL CONCRETE USING MESSOBO ORDINARY PORTLAND CEMENT

Abstract

Mix design is a process in which one determines
the relative quantities of the ingredients prior to
mixing to produce the desired quality of concrete.
By varying the mix proportions of the ingredients,
d{[ferent strength grades of concrete can be
obtained. Several factors, which include water
cement ratio, workability, curing type and
duration, sizes of coarse aggregate, and sand silt
content are among the several factors attributing to
the quality of concrete.
/n this paper, attempts have been made to provide
mix design proposals considering the most
important factors contributing to the quality of
concrete. Fxtensive concrete mix preparations
were made to obtain concrete strength grades up to
C-.J5 using .Hessebo Ordinary Portland Cement
(OPe;. Realizing the various factors contributing
to the quali~v of concrete, .J3 trial batches of
different mix designs were investigated. Based on
the test results, equations were derived to relate
compressive strength to wle and to predict the 28
days compressive strength from the 7 days
compressive strength. /n all cases, Messebo ope
was used and the results show that it can be used to
produce concrete grades of higher quality (up to
C-.J5) .fiJr the construction industry of normal
practices.