A Study of Strength Development and Carbonation of Concrete Incorporating High Volume Blast Furnace Slag


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Title: A Study of Strength Development and Carbonation of Concrete Incorporating High Volume Blast Furnace Slag

Author(s): J. Nakamoto and K. Togawa

Publication: Special Publication

Volume: 153


Appears on pages(s): 1121-1140

Keywords: accelerated tests; adiabatic conditions; blast furnace slag; carbonation; compressive strength; curing; field tests; heat of hydration; strength; temperature; temperature rise; Materials Research

Date: 6/1/1995

Describes the results of an experimental study carried out on concretes incorporating high volume of ground granulated blast furnace slag. The slag content in cement ranged from 50 to 95 percent by weight of the total cementitious materials; the fineness of slag ranged from 4000 to 8000 cm 2/g. A large number of test specimens were subjected to the determination of heat of hydration and amount of chemically combined water in cement paste, adiabatic temperature rise, compressive strength, static modulus of elasticity, and rate of carbonation in concrete. The following results were obtained. 1. The strength development of high blast furnace slag content concrete is more highly influenced by the curing temperature than that of slag free concrete. 2. For compressive strengths below 5 MPa, the compressive strength developed quickly with increasing slag content in the range of 70 to 95 percent, regardless of fineness of slag. 3. The strength of high blast furnace slag content concrete is strongly related to the amount of effective combined water, especially at the early ages. 4. The correlation between the compressive strength and the maturity is higher on the maturity of the basic temperature of 0 C than that of -10 C. 5. The maximum adiabatic temperature rise (K) of concrete mixture decreased with increasing ground blast furnace slag content, especially in the range of more than 70 percent. 6. It is very useful to utilize the high fineness slag (such as 8000 cm 2/g), because the adiabatic temperature rise per unit compressive strength decreases with increasing fineness of slag. 7. The depth of carbonation of high blast furnace content concrete is proportional to the square root of age similar to that of ordinary portland cement concrete. Using this relationship, the progress of carbonation in field exposure can also be predicted.