Predicting ASR aggregate reactivity in terms of its activation energy

Ghanem, Hassan; Zollinger, Dan G; Lytton, Robert L.

doi:10.1016/j.conbuildmat.2009.12.033

Cited by 24 publications

(9 citation statements)

References 4 publications

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“…The expansion data at the extended testing period of at least 56 days would better predict the UME of aggregates, and hence, the ASR classifications of the aggregates can be improved. ASTM C 1260ASTM C (2007 b Failure limit recommended by Islam (2010); c Failure limit suggested by Ghanem et al (2010)…”

Section: Figure 1 Progression Of Mortar Expansions Obtained the Studmentioning

confidence: 99%

“…Since ASR is a kinetic type reaction, Mukhopadhyay et al (2005) and Ghanem et al (2010) demonstrated that a kinetic model can be implemented to predict the characteristic of ASR-induced expansion. Most recently, concrete at the nuclear power plants has been shown to be decayed resulting a great concern for nuclear safety authorities (MacLeod 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Most recently, concrete at the nuclear power plants has been shown to be decayed resulting a great concern for nuclear safety authorities (MacLeod 2012). Ghanem et al (2010) also proposed the ASR decay model (ADM), shown in Eq. (1), to determine the ultimate mortar expansion (UME) and time to reach at the UME.…”

Section: Introductionmentioning

confidence: 99%

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Decay Model for Alkali-Silica Reaction

Islam¹,

Ghafoori²,

Al-Rufaydah³

2016

Sustainable Construction Materials and Technologies (SCMT)

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This study predicts the ultimate expansion of mortar bars (UME) due to alkali-silica reactivity (ASR). The experimental expansión data utilized in this study were obtained from two previous studies. The experimental expansion data over the test duration of 28 days was fitted with the existing proposed decay model to predict the UME and time required to reach at 50%, 75% and 90% of UME. Finally, aggregates susceptible to alkali-silica reactivity were determined based on the existing proposed limit of UME, and were compared with the results obtained by the aggregate geology and expansion limits at the test durations of 14 and 28 days. The study showed that the ultimate mortar expansion and time required reaching various percentages of UME varied on aggregate mineralogy.

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Section: Figure 1 Progression Of Mortar Expansions Obtained the Studmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decay Model for Alkali-Silica Reaction

Islam¹,

Ghafoori²,

Al-Rufaydah³

2016

Sustainable Construction Materials and Technologies (SCMT)

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“…The more the gel absorbs moisture the more the internal pressure increases, inducing, thus, the development of microcracks. In extreme situations, this process can lead to concrete rupture [5][6][7][8]. The characteristic pattern and extension of the cracking process provide information about the mechanism of internal expansion reactions and about the magnitude of the microscopic damage to the concrete structure, as explained in [3,5].…”

Section: Introductionmentioning

confidence: 99%

“…The characteristic pattern and extension of the cracking process provide information about the mechanism of internal expansion reactions and about the magnitude of the microscopic damage to the concrete structure, as explained in [3,5]. Many concrete design codes establish tests to assess the potential reactivity of aggregates used in concrete production with a focus on mortar or concrete specimens [8][9][10]. However, the great challenge to be overcome in the use of these methods is the reliability of the results provided and their ability to reproduce real situations found in the daily practice of constructing concrete structures [7,9].…”

Section: Introductionmentioning

confidence: 99%

Diagnosis and Assessment of Deep Pile Cap Foundation of a Tall Building Affected by Internal Expansion Reactions

et al. 2021

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Early deterioration of reinforced concrete foundations has been often reported in recent years. This process is usually characterized by an extensive mapping cracking process on concrete surfaces that results from several types of Internal Swelling Reaction (ISR). In this paper, a real case study of a tall reinforced concrete building with a severe deterioration process installed in its deep foundations is discussed. Laboratory tests were performed in concrete drilled cores extracted from a deep pile cap block 19 years after the beginning of construction. Tests to assess the compressive strength, the static and the dynamic modulus of elasticity, the gas permeability, and electron microscopy scanning to find out the primary mechanism responsible for the deterioration observed during in situ inspections. Chemical alterations of materials were observed in concrete cores, mainly due to Delayed Ettringite Formation (DEF), which significantly affected the integrity and durability of the structure. Dynamic modulus of elasticity showed to be a better indicator of damage induced by ISR in concrete than compressive strength. Procedures to strengthen the deteriorated elements using prestressing proved to be an efficient strategy to recover the structural integrity of pile caps deteriorated due to expansions due to ISR.

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