DEVELOPMENT OF MIX DESIGN FOR HIGH STRENGTH
31st Our World in Concrete and Structures (OWICs) - 2006
M. Yaqub*, University of Engineering and Technology Taxila, Pakistan
Imran Bukhari, University of Engineering and Technology Taxila, Pakistan
High strength concrete, Compressive strength, Aggregates, Mix design.
This paper present the result of mix design developed for high strength
concrete. Development of mix design method plays a key not in concrete technology.
It involves the process of determining experimentally the most suitable concrete
mixes in order to achieve maximum strength with at least economic expenditures. In
this research work the locally available constituents of concrete were selected for the
purpose of determining their relative quantities and proportions for best results. As
the trend of high strength increase in all over the world it is strong need to investigate
the factor enhancing the compressive strength of concrete at least economical
expenditure. To make economical use of high strength concrete in Pakistan a mix
design for high strength concrete was developed. In this research work four mix were
selected to achieve a compressive strength up to 162 Mpa. The variables were
aggregate sizes and mix ratio. Four mix ratios by weight were selected with 0.3
water cement ratio. Ultra 727 super plasticizer was used to improve the workability of
concrete mix. Locally available coarse and fine aggregates were used with ordinary
Portland cement. It was concluded that the compressive strength depends on mix
ratio, size and texture of aggregates and method of compaction. It is further
concluded that 1:0.75:1.5 showed higher strength than other three mix ratios.