micro silica fume

Yu Lin® micro silica fume Description The American Concrete Institute (ACI) defines Microsilica (also known as Silica Fume) as “very fine noncrystalline silica produced in electric arc furnaces as a by-product of the production of elemental silicon or alloys containing silicon” Microsilica consists of very fine vitreous particles with a surface area ranging from 15 to 30 m2/g, with particle approximately 100 times smaller than the average cement particle. Because of its extreme fineness and high silica content, Microsilica is a highly effective pozzolanic material. Microsilica is used in concrete to improve its properties. It has been found that Microsilica greatly improves compressive strength, bond strength, and abrasion resistance; reduces permeability; and therefore helps in protecting reinforcing steel from corrosion. National Silica Fume Standard Mandatory Chemical &Physical Requirement Unit USA ASTM C1240 European EN 13263 Japan JIS A6207 China GB/T 18736 Korean KS F2567 Vietnam TCXDVN 311 SiO2 % >85 >85 >85 >85 >85 >85 SiO3 % <2.0 <3.0 <3.0 Cl- % <0.3 <0.1 <0.2 <0.3 Free CaO % <1.0 <1.0 MgO % <5.0 <5.0 Free Si % <0.4 Moisture % <3.0 <3.0 <3.0 <3.0 <3.0 <3.0 Loss On Ignition (L.O.I) % <6.0 <4.0 <5.0 <6.0 <5.0 <6.0 Specific Surface Area (B.E.T) % >15 15-35 >15 >15 >15 >12 Pozzolanic Activity % >105 at 7 days accel. curing >95 at 7 days >105 at 28 days standard curing >85 at 28 days Standard curing >85 at 7 days standard curing Retained on 45u % <10 <5.0 <10 Variation From Average on 45u % <5 Packaging Microsilica is supplied in a range of packagings: 800 900kg jumbo PP bag with PE liner The Jumbo bag conforms to GB/T10454 and EN ISO 21898 with UV-proof function and anti-aging character. 25kg woven bags with PE liner; 25kg paper bags or plastic woven bag 10kg paper bags; Storage and Transportation Yu Lin set up own factory and own warehouse which lies thousands of squares. Containerized Shipment Break-Bulk shipment