Tenders are invited for Supply of
fine aggregate sieve shaker (motorized with digital timer) with brass sieves of 4.
reclaimer is geared for extracting coarse and
fine aggregate to be resold for fill material, or washed, separated, and stockpiled for recycling.
Two different sources of internal water supply are compared: 1) replacement of a portion sand by partially saturated lightweight
fine aggregate 2) the addition of superabsorbent polymer particles (PEG).
In view of the fact that their properties are more or less the same as that of the sand, the marble sludge powder and the quarry dust are effectively employed as
fine aggregate in the cement concrete [15].
Moreover depleting sources of sand in Pakistan triggered the dire need of replacement of
fine aggregate of the concrete.
On the other hand, researchers (Ugurlu, Topcu 2003) stressed out that the addition of 7-10% of mineral filler to
fine aggregate (0-2 mm) improved the properties of concrete such as: compressive strength and flexural strength.
The method determines coarse aggregate as those particles that create voids and
fine aggregate as those particles that fit into the voids created by the coarse aggregates.
In this study performance of mortar incorporating 10%, 20% and 30% polymers as volume replacement of
fine aggregate was investigated.
The particle size distribution of the aggregates was according to AHSTO classification (Hogentogler and Terzaghi, 1929) with
fine aggregate belonging to zone 5 of the classification, whereas the maximum diameter of the coarse aggregate was 20 mm, the average specific gravity of the
fine aggregate was 2.
This very
fine aggregate gives the best appearance when cured.
In this study, it is planned to replace some percentage of
fine aggregate with copper slag and some percentage of cement with GGBS to develop the high performance concrete.
The assets include 100 hard rock or
fine aggregate extraction sites producing annually 30 million tonnes.
