Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Self-healing of self-compacting concrete
There are many attractive properties of self-compacting concrete in the fresh state as well as in the hardened state. The use of this newly developed concrete technology is growing extensively in construction industry all over the world. One of the main advantages of self-compacting concrete is the reduction in construction time, which may results in situations where the concrete is subjected to early overloading. In this paper the results of an experimental investigation on the effect of early overloading of self-compacting concrete on its hardened properties at later ages is reported. Concrete specimens from three self-compacting concrete mixes with different w/c ratios (0.45, 0.50 and 0.55) was prepared and loaded to different stress levels, namely 40%, 60% and 80% of its strength at time of loading, at ages of one-day and three days. These specimens were wet-cured along with companion control specimens up to 28 days. At 28 days, the previously loaded specimens, along with the control specimens, were tested by measuring the ultrasonic pulse velocity through the concrete specimens and obtaining the compressive strength. The results show that loading self-compacting concrete at an age up to three days and up to a stress level of 80% of concrete strength will not harm the concrete hardened properties at later ages and all cracks resulted from early loading were self-healed during the curing period.
Self-healing of self-compacting concrete
There are many attractive properties of self-compacting concrete in the fresh state as well as in the hardened state. The use of this newly developed concrete technology is growing extensively in construction industry all over the world. One of the main advantages of self-compacting concrete is the reduction in construction time, which may results in situations where the concrete is subjected to early overloading. In this paper the results of an experimental investigation on the effect of early overloading of self-compacting concrete on its hardened properties at later ages is reported. Concrete specimens from three self-compacting concrete mixes with different w/c ratios (0.45, 0.50 and 0.55) was prepared and loaded to different stress levels, namely 40%, 60% and 80% of its strength at time of loading, at ages of one-day and three days. These specimens were wet-cured along with companion control specimens up to 28 days. At 28 days, the previously loaded specimens, along with the control specimens, were tested by measuring the ultrasonic pulse velocity through the concrete specimens and obtaining the compressive strength. The results show that loading self-compacting concrete at an age up to three days and up to a stress level of 80% of concrete strength will not harm the concrete hardened properties at later ages and all cracks resulted from early loading were self-healed during the curing period.
Self-healing of self-compacting concrete
Abdel-Jawad, Yahia (Autor:in) / Dehn, Frank (Autor:in)
2005
7 Seiten, 4 Bilder, 3 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Englisch
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