Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mechanical behaviour of high strength concretes with high-volume fly ash
Eight concrete mixes were prepared using the same Portland cement (OPC) and the same type of low-lime ground fly ash, in which the aggregate grading of concrete, water-binder ratio, and the maximum particle size of aggregate were kept constant, but the partial replacement of cement by fly ash was varied from 0% (OPC concrete) to 70 %, in steps of 10 %. The replacement was on one to one weight basis. At 28 days, however, there was little reduction in compressive strength up to 40 % cement replacement by ground fly ash; then significant decrease was recorded for the further fly ash dosages. The 56-day compressive strength up to 40% cement replacement by fly ash is almost identical to that of the no fly ash concrete. Beyond this level, the compressive strength decreases significantly. It is also shown that the brittleness index increases substantially with increasing compressive strength of concrete. The mortar phases of these concretes were also prepared. The results obtained show that, for the mortar phases, when the dosage of fly ash increases, 2-, 7-, and 28-day compressive strengths decrease. The 56-day compressive strength of mortar, however, up to 40 % cement replacement by ground fly ash was nearly equal to that of no fly ash mortar.
Mechanical behaviour of high strength concretes with high-volume fly ash
Eight concrete mixes were prepared using the same Portland cement (OPC) and the same type of low-lime ground fly ash, in which the aggregate grading of concrete, water-binder ratio, and the maximum particle size of aggregate were kept constant, but the partial replacement of cement by fly ash was varied from 0% (OPC concrete) to 70 %, in steps of 10 %. The replacement was on one to one weight basis. At 28 days, however, there was little reduction in compressive strength up to 40 % cement replacement by ground fly ash; then significant decrease was recorded for the further fly ash dosages. The 56-day compressive strength up to 40% cement replacement by fly ash is almost identical to that of the no fly ash concrete. Beyond this level, the compressive strength decreases significantly. It is also shown that the brittleness index increases substantially with increasing compressive strength of concrete. The mortar phases of these concretes were also prepared. The results obtained show that, for the mortar phases, when the dosage of fly ash increases, 2-, 7-, and 28-day compressive strengths decrease. The 56-day compressive strength of mortar, however, up to 40 % cement replacement by ground fly ash was nearly equal to that of no fly ash mortar.
Mechanical behaviour of high strength concretes with high-volume fly ash
Mechanisches Verhalten hochfester Betone mit Zusätzen von hochvoluminöser Flugasche
Sengul, O. (Autor:in) / Tasdemir, C. (Autor:in) / Yüceer, Z. (Autor:in) / Erbaydar, M. (Autor:in) / Tasdemir, M.A. (Autor:in)
2002
14 Seiten, 6 Bilder, 8 Tabellen, 25 Quellen
Aufsatz (Konferenz)
Englisch
Mechanical Behaviour of High Strength Concretes with High - Volume Fly Ash
| British Library Conference Proceedings | 2002
Mechanical Properties of High-Volume SCM Concretes
| NTIS | 2011