Alkali aggregate reaction in prestressed concrete beams

Kobayashi, Kazuo; Inoue, Shozo; Yamasaki, Takao; Nakano, Kin-ichi

doi:10.1016/0262-5075(88)90053-x

Cited by 9 publications

(1 citation statement)

References 2 publications

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“…The structural performance of the prestressed beams made of concrete affected by ASR-affected by ASR was described by Kobayashi et al (1988) in comparison with those of corresponding healthy beams. Ten 1600 mm PC beams made of two types of concrete with alkali-silica reactivity and sound concrete under an accelerated curing condition of 40 ºC and 100% RH were subjected to long-term monitoring of changes in steel strains and destructive tests with shear span to effective depth ratio of 2.5 and 4.0.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Fukada

Torii

2017

ACT

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Effect of alkali silica reaction on pretensioned concrete bridge girders

Aligolnia,

Yousefpour

2024

Structural Concrete

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Alkali silica reaction (ASR) is an undesirable phenomenon that occurs between alkalis that usually originate from cement and certain types of siliceous aggregates in concrete. The result of this reaction is delayed expansion of hardened concrete in the presence of moisture, which may cause cracking and damage in an existing structure. The present paper investigates the general behavior and shear strength of pretensioned concrete bridge girders affected by ASR. Four identical pretensioned concrete AASHTO Type I girders were fabricated using reactive concrete and subjected to environmental conditioning at a relative humidity of 100% and a temperature of 45 degrees Celsius for up to 296 days to accelerate the development of ASR. During this period, ASR‐induced expansions, changes in surface strains of concrete, transfer lengths, and patterns of damage and cracking were monitored. Each specimen was subjected to shear‐critical loading until failure upon reaching the desired expansion level. The results showed that the existence of prestressing force played a significant role in limiting the ASR‐induced in‐plane expansion and cracking. Progress of ASR caused a reduction in the load corresponding to the first detected flexural crack but an increase by up to 14% in the load corresponding to the first diagonal cracking compared to the control specimen, likely due to the additional prestress caused by restrained ASR‐induced expansions. The ultimate shear strength of ASR‐affected girders was generally within 5% of the control specimens, and all specimens exceeded their nominal shear strengths according to AASHTO LRFD 2020 specifications. Until the unrestrained uniaxial expansion of 0.2%, no significant concerns were identified regarding the shear strength of the ASR‐affected pretensioned concrete specimens.

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