[quote=jokes]I have noticed the concrete floors in office building and homes done during and immediately after the British colonization and my older uncles homes in shags are still new and in pristine condition while the ones we do now days including mine are developing cracks within a very short period of time.
whats the cause of this? (You are)
what are we doing wrong? (hiring quacks)
are our fundis that bad (no, but skilled ones cost money)

OPC(ordinary portland cement 42. 5N) vs PPC(pozzolana 32. 5N),in yester years the former was used while presently the latter is widely used but ratios of materials or mix design has remained the same e.g 1 cement:2 sand:4 ballast for class 20 concrete

Sasa ukaulizwa, umenisaidia namna gani hapo??