Material properties of retested specimens composed of tailings, cement, and blast furnace slag.
Tesarik-DR; Seymour-JB; Lane-WL
Spokane, WA: United States Department of Energy, Spokane Research Center, RI 9636, 1996 Jan; :1-16
The material properties of retested specimens consisting of tailings, cement, and blast furnace slag were examined. The composition of the lead slag, iron slag, and cycloned tailings were determined by inductively coupled plasma analysis. Cycloned tailings were composed mainly of calcium and magnesium. Lead slag was composed mainly of iron, whereas calcium contributed most to iron slag. Four mixes of binder and cycloned tailings were shaped into cylindrical specimen molds: cement and tailings; lead slag and tailings; cement, lead slag, and tailings; and cement, iron slag, and tailings. The cured specimens were tested in a servo-hydraulic loading frame. The addition of iron slag to mixtures containing 2 and 4% cement significantly increased the 28 day unconfined compressive strength. However, specimens containing 6% cement were markedly stronger than specimens containing 2% cement plus 4% iron slag. Upon retesting, the unconfined compressive strength increased with increasing binder concentration. The addition of lead slag to mixtures containing 2 and 4% cement significantly increased the 28 day unconfined compressive strength. Strength increased in most specimens when retested on day 35. Only specimens containing 4% cement increased in strength when retested on day 90. The strengths of specimens tested multiple times were substantially lower than those of specimens tested on day 90 alone. The binder percentage was highly correlated with the unconfined compressive strength, with an overall coefficient of 0.85. The 28 day stiffness was elevated by the addition of either lead or iron slag. Generally, increases in the quantity of binder increased the modulus values of the specimens. Upon retesting, the modulus values of the specimens containing lead slag increased, while those of the specimens containing iron slag decreased. The authors conclude that the addition of blast furnace slag increases both strength and stiffness.
Construction-materials; Materials-testing; Heavy-metals; Physical-properties; Cements; Analytical-methods; Testing-equipment; Blast-furnaces; Chemical-composition; Hydraulic-equipment; Compression-tests
Report of Investigations
NTIS Accession No.
Spokane, WA: United States Department of Energy, Spokane Research Center, RI 9636