Superslag
NEW PRODUCT SPECIFICATION BULLETIN
SUPERSLAG : A mineral additive; Ground Granulated Blast Furnace Slag finely ground to specification to be used in conjunction with Ordinary Portland Cement.NOTE TO SPECIFIERS: This document has been prepared as a suggested specification geared towards assisting Civil Engineers, Architects and other specifiers in developing specifications for the use of Superslag produced by Harricrete Limited in project specifications. This is not intended to be a stand-alone specification. Nor is it intended that this document be re-created directly into projects specifications. At all times, proper concreting practices should be utilized and encouraged in the development of specifications as described in the American Concrete Institute Documents.
SPECIFICATION ITEMS:
(1) GROUND GRANULATED BLAST FURNACE SLAG (GGBFS) -This material conforms to the requirements of ASTM C989 for a grade 100 GGBFS.
(2) SUPERSLAG -this material is a grade 100 GGBFS and is available from Harricrete Limited, Jankie Trace, Las Lomas #2 Trinidad, West Indies. MIX RATIOS -GGBFS shall be used in a 1 : 1 ratio (50/50) with Ordinary Portland Cement. This ratio shall be determined as a percentage by means of total cementitious materials.
MIX RATIO FOR SPECIFIC APPLICATIONS -The ratio in which GGBFS is used in relation to Ordinary Portland Cement (OPC) is determined by the specific application or performance property desired by the specifier. As such, deviation from the 1: 1 ratio may be undertaken at the discretion of the specifier.
(a) General Purpose Use -50% GGBFs
(b) High Early Strength -30 -50 % GGBFS
(c) High Sulphate Resistance -50% minimum \ NOTE: these ratios are geared specifically towards the use of GGBFS with Type I OPC in achieving desired performance characteristics. Ratios would vary depending on the type of OPC used.
(d) Mass Concrete -60 -70% NOTE: increased levels of GGBFS results in increased setting times and reduced heat of hydration making these levels ideal for mass concreting purpose.
(e) Alkali Silicate Reaction (ASR) -35% and over GGBFS NOTE: At percentage ranges in excess of35% resistance to Alkali Silicate Reactions is increased. Air Content -The use of GGBFS does not cause any further entrainment of air into the concrete.
(f) Density -The specific gravity of GGBFS is approximately 2.9 compared to 3.1 of Ordinary Portland Cement. As such, specifications relating to the bulk unit density of GGBFS/OPC concrete should be adjusted to take this into account. The bulk unit density is also thus affected.
(g) Fineness -The particle size of GGBFS is significantly smaller than that of OPC and shall be taken to be 3,000- 5,000 blaine per m3 per gram.
(h) Yield- Because of the lower bulk unit density of GGBFS, the volume per cubic foot is greater than that of Portland Cement. Hence, adjustments should be made to take this into account when specifying yield, volume and mix quantities.
(i) Finishing- Because of it's finer particle size GGBFS will give superior finishability, however, all good concreting practices associated with proper finishing shall be followed and encouraged in finishing concrete utilizing GGBFS 0) Curing -Concrete comprising GGBFS shall be cured by any generally acceptable curing method. This may include powdering, the use of fog, sprays, steam curing, the use of wet burlap, use of polyethylene sheets, curing membranes, and evaporation reducers among others.
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