In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effect of Slag Fineness on the Development of Concrete Strength and Microstructure
Author(s): N. Nakamura, M. Saki, and R. N. Swamy
Publication: Special Publication
Appears on pages(s): 1343-1366
Keywords: blast furnace slag; compressive strength; heat of hydration; high-strength concretes; microstructure; scanning electron microscope; permeability; slags; Materials Research
Abstract:Presents the test data on the development of the microstructural properties of concrete containing 50 percent replacement of cement by ground granulated blast furnace slag of varying fineness. The concrete mixtures were proportioned for a 28-day compressive strength of 60 to 120 MPa; the ground granulated blast furnace slag was obtained by pulverizing and classifying ordinary ground slag of 453 m¦/kg of surface area by air permeability. Three degrees of fineness, namely, 453, 786, and 1160 m¦/kg, were used to replace portland cement. The water-binder ratio was kept low at 0.30 and 0.40, and a high-range water-reducing admixture (HRWR) was used to give concrete slumps of 160 to 200 mm. The following microstructural characteristics and properties were investigated: pore structure by mercury intrusion, hydration and rate of heat evolution, microstructure by scanning electron microscopy, and water permeability. The data obtained from these tests are analyzed and correlated, where appropriate, to strength development. It is shown that the use of very fine slag of about 1200 m¦/kg specific surface area results in accelerated hydration, high early strength of 30 to 50 MPa at 3 days, high 28-day cylinder compressive strength of 100 to 110 MPa, very low total pore volume and fine pore sizes, a highly densified microstructure, and very low water permeability diffusion coefficient.
Click here to become an online Journal subscriber