1. Introduction:
Silica fume admixture, also called as micro silica, silica dust, which is a by-product of producing silicon metal or ferrosilicon alloys.
Silica fume consists primarily of amorphous (non-crystalline) silicon dioxide (SiO2). Because of its fine particles, large surface area,
and the high SiO2 content,
silica fume is a very reactive pozzolan when used as concrete admixture. The quality of silica fume is specified by ASTM C 1240 and AASHTO M 307.
2. Silica Fume admixture Main Features:
* High early strength
* Greater impermeability
* High ultimate compressive strengths
* Substantially greater resistance to corrosion
3. Specifications:
SiO2 : 92% min
LOI : 3% max
Moisture : 2.5% max
SO3 : 2% max
MgO : 5% max
Alkali content (Na2O + 0.658K2O) : 1.5% max
Chloride content : 0.1% max
Free CaO : 1% max
Free SiO2 : 0.4% max
Density : 600 – 700 Kg/m3
+45 Microns : 5% max
1)Standards : as per ASTMC 1240 2)
2) Quantity: 1000 Mt +/- 10% per month in partial shipments
3) Payment: 100% Irrevocable LC at sight
4) Inspection: SGS company
5) Delivery: within 30 days from the receipt of L/C or T/T50% advance and rest payment paid before shipment
6) Packing: in jumbo bags in 20feet containers with pallets
4. Silica Fume admixture application:
silica fume as an admixture for readymix plant, seaport, high building, reservoir dam, Railway, driver road, bridge, metro, tunnel, airport runway, coal lane and etc
