Asr Diagnosis by Petrographic Investigation and Evaluation of Mechanical Performance of Asr Deteriorated Pretensioned Pc Beam

Tomiyama, Jun; Yamada, Kazuo; Kaneda, Kazuo; Iraha, Shigeo; Oshiro, Takeshi

doi:10.2208/jscejmcs.67.578

Cited by 1 publication

(1 citation statement)

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“…Compared to the specimen mixed with fly ash, the toughness of H girder was deteriorated by the influence of ASR. This 5% reduction in the loading capacity is consistent with results of previous studies conducted in actual bridges (Tomiyama et al 2011;Takebe et al 2013). However, a prior research of Onozato et al (2006) proved that the flexural strength did not decrease because the expansion of ASR was restrained by prestressing force.…”

Section: Testing Methodssupporting

confidence: 91%

Effects of Fly Ash on Mechanical Properties of PC Girder Using Reac-tive Andesite Aggregates

Fukada

Torii

2017

ACT

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In the Hokuriku region, alkali-silica reaction (ASR) caused severe degradations in many concrete bridges. However, criteria for repair and replacement works of these structures are still unclear. For the development of damage evaluation procedure, it is necessary to investigate the load-carrying capacity of prestressed concrete (PC) girders affected by ASR-induced deterioration in actuality. This study constructed two full-size PC specimens from the high-early-strength Portland cement and reactive aggregates, and then exposed them to outdoor environmental conditions. One of them was specially mixed with a controlled amount of fly ash. After one and a half years of outdoor exposure, destructive loading tests were carried out to investigate the difference in loading capacity of the girders. From results of the long-term exposure and the tests, the flexural strength and the rigidity of the specimen with fly ash were not degraded while ASR was also effectively suppressed. In addition, cylindrical concrete cores were taken at different positions of both girders to analyze the relationship between mechanical properties of concrete such as compressive strength, static elastic modulus, and ultrasonic wave propagation speed. Results of the coring test showed that the mechanical properties of concrete cores varied according to their collecting positions and directions.

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Section: Testing Methodssupporting

confidence: 91%