Portland cement is generally made of clay, lime, iron sand, silica sand and alumina sand, In this research, the
manufacture of cement by using the material in the form of Sidoarjo mud because it has a clay content that resembles
that of 2,34% CaO, 6,52% Al2O3, SiO2 Fe2O3 67,63% and 4,88%, making it possible to make an manufacture of
Portland cement with addition of CaO and through the combustion process, Research done by mixing mud in Sidoarjo
in chalk in some variation ratio of 40:60; 37,5:62,5; 35:65; 32,5:67,5 and 30:70, After a homogeneous mixture and
then baked in the furnace at a temperature variation 1200o
C with the time allowed is 60, 90, 120, 150 and 180 minutes,
Cement is then the compressive strength test and analyzed levels of the chemical, Retrieved best conditions on a
comparison between proportion of Sidoarjo mud and lime 30:70, 3 hours burning time and compressive strength value
of 13,00 kg / cm2
for ages 3 days and 15,08 kg / cm2
to age 7 days
