A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
High-strength, rapid-setting concrete with blended cement
This report documents the preliminary investigation of a newly developed blended-hydraulic cement for producing high-early strength, rapid-setting concrete. The blended cement is composed primarily of Class C f1y ash recovered from the burning of powdered subbituminous coal. The Class C fly ash generally makes up 77 to 95 percent by mass of the total material. The remaining part can he slag or portland cement or both. Four readily available chemical admixtures are used in small quantities to control the workability and setting time of the cementitious material, to enhance the strength, and improve the durability. These chemical admixtures are a set-suspending agent, an activator, a modifying retarder, and an accelerator. The objective of this research was to conduct a preliminary investigation of the blended cement-admixture system to determine its viability for use in producing workable, durable, high-early strength concrete. Two blended cements were used in the investigation, each being produced from a different source of Class C f1y ash. Concrete produced with Type III portland cement, including a water-reducing admixture and a high-range water-reducing admixture, were tested for a comparison. Fresh concrete properties measured included slump, air content, unit weight, temperature, and time of setting. Hardened properties measured included compressive strength, resistance to freezing and thawing, electrical indication of
High-strength, rapid-setting concrete with blended cement
This report documents the preliminary investigation of a newly developed blended-hydraulic cement for producing high-early strength, rapid-setting concrete. The blended cement is composed primarily of Class C f1y ash recovered from the burning of powdered subbituminous coal. The Class C fly ash generally makes up 77 to 95 percent by mass of the total material. The remaining part can he slag or portland cement or both. Four readily available chemical admixtures are used in small quantities to control the workability and setting time of the cementitious material, to enhance the strength, and improve the durability. These chemical admixtures are a set-suspending agent, an activator, a modifying retarder, and an accelerator. The objective of this research was to conduct a preliminary investigation of the blended cement-admixture system to determine its viability for use in producing workable, durable, high-early strength concrete. Two blended cements were used in the investigation, each being produced from a different source of Class C f1y ash. Concrete produced with Type III portland cement, including a water-reducing admixture and a high-range water-reducing admixture, were tested for a comparison. Fresh concrete properties measured included slump, air content, unit weight, temperature, and time of setting. Hardened properties measured included compressive strength, resistance to freezing and thawing, electrical indication of
High-strength, rapid-setting concrete with blended cement
Hochfester, schnell ansteifender, mit Zement vermischter Beton
Neeley, B.D. (author)
Materials for the New Millennium, Materials Engineering Conf, 4 ; 2 ; 1627-1636
1996
10 Seiten, 4 Bilder, 3 Tabellen
Conference paper
English
High Strength, Rapid-Setting Concrete with Blended Cement
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