Title: Properties of Flowable Self-Compacting Slurry Using Quarry By-Products and Ponded CCPs
Author(s): I R. Naik, R. N. Kraus, Y. Chun, R. Siddique, and E D. Botha
Publication: Symposium Paper
Appears on pages(s): 523-538
Keywords: compressive strength; fine crushed sand; flowable slurry; ponded CCP; quarry by-products; settlement; water permeability
This paper reports the properties of two series of flowable self-compacting slurry. In Series 1, five mixtures of flowable slurry were made using ponded coal-combustion fly ash and quarry screenings (fine crushed sand). In Series 2, six mixtures of flowable slurry were made, the first five mixtures using the ponded coal-ash and natural sand, and the final one mixture using Class C fly ash and natural sand. Ash and quarry-screenings contents of the mixtures are expressed as percentages of the sum of the quantities of the ash and aggregate. For Series 1 flowable-slurry mixtures, ponded-ash content was 100, 67, 53, 35, and 0 percent, and quarry-screenings content was 0, 33, 47, 65, and 100 per-cent, respectively. In Series 2 flowable-slurry mixtures, ash content was 100, 81, 60, 40, 20, and 4 percent, and sand content was 0, 19, 40, 60, 80, and 96 percent, respectively. For both series of flowable-slurry mixtures, tests were performed for flow, density, settlement, compressive strength, and permeability. Ambient air and slurry temperatures were also recorded. Compressive strength of both Series 1 and Series 2 mixtures increased with age. Compressive strength of Series I mixture was higher than Series 2 mixtures. It was also observed that the permeability of flowable-slurry mixtures decreased with increase in age due to improvement in microstructure and increase in strength of the flowable-slurry mixtures. Mixtures containing quarry screenings were also less permeable.