Alkali Silica Reaction (ASR) as a root cause of distress in a concrete made from Alkali Carbonate Reaction (ACR) potentially susceptible aggregates

Beyene, Mengesha; Snyder, April; Lee, R.J.; Blaszkiewicz, Michael

doi:10.1016/j.cemconres.2013.04.014

Cited by 31 publications

(13 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Brucite has been considered as one of the main factors responsible for the loss of concrete durability [35]. However, in other cases, the highest expansion and loss of durability was attributed to the alkali-silica reaction (ASR) produced by the reactions due to the presence of quartz in the concrete matrix, which can accompany the dolomitic aggregates [36,37].…”

Section: Discussionmentioning

confidence: 99%

Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain)

2020

View full text Add to dashboard Cite

The Camarasa Dam was built in 1920 using dolomitic aggregate and Portland cement with two different compositions: type A (dolomite and Portland cement) and type B (dolomite and sand-cement). The sand cement was a finely powdered mixture of dolomite particles and clinker of Portland cement. The mineralogy of concrete was studied by optical microscopy, scanning electron microscopy, and x-ray powder diffraction. Reaction of dedolomitization occurred in the two types of concrete of the Camarasa Dam, as demonstrated by the occurrence of calcite, brucite, and/or absence of portlandite. In the type A concrete, calcite, brucite, and a serpentine-group mineral precipitated as a rim around the dolomite grains and in the paste. The rims, a product of the dedolomitization reaction, protected the surface of dolomite from the dissolution process. In type B concrete, in addition to dolomite and calcite, quartz and K-feldspar were present. Brucite occurred in lower amounts than in the type A concrete as fibrous crystals randomly distributed in the sand-cement paste. Although brucite content was higher in the type A concrete, type B showed more signs of loss of durability. This can be attributed to the further development of the alkali-silica reaction in this concrete type.

show abstract

Section: Discussionmentioning

confidence: 99%

Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain)

2020

View full text Add to dashboard Cite

show abstract

“…The silica in solution state contained in the pores reacts with Na + and K + (having positive ions) to form alkaline silica gelatin (alkali-silica gel) which is unstable in volume. The gel absorbs water and expands, and the hydration reaction is accelerated by rain or melted snow [14,15]. Since the gel is restrained by the surrounding mortar, osmotic pressure is generated by the swelling.…”

Section: Mechanism Of Asr and Degradation Of Properties Of Cement In mentioning

confidence: 99%

Analysis of Long-Term Deterioration Characteristics of High Voltage Insulators

et al. 2019

View full text Add to dashboard Cite

The deterioration of the cement that bonds the cap, pin, and porcelain shell of the porcelain insulators can be observed by three-dimensional computed tomography (3D-CT), a non-destructive test. When porcelain insulators are used for a long duration, the size of the pores existing in the cement increase as the cement expands due to the alkali-silica reaction (ASR). It is possible to visually confirm the corrosion of caps and pins. The degree of corrosion is divided into four noticeable stages (I-IV), and deterioration of cement includes one of the four stages of corrosion. The standard time of replacement of insulator vs. continued use is presented. As a result of X-ray diffraction (XRD) analysis, Fe is oxidized to Fe 2 O 3 at 36, 43, 54, and 70 degrees. The corrosion in cement is caused by factors including the value of pH, oxygen content, and temperature. For the caps and pins, although a zinc coating is applied to prevent the corrosion of iron, corrosion of zinc is caused by substances present in the external environment. When the zinc coating begins to corrode, the corrosion of the Fe component of the cap and pin accelerates, causing mechanical/electrical problems.

show abstract

“…The first stage of the alkali-silica reaction (ASR) is the reaction between the hydroxyl ions (OH -) present in the pore solution, and the reactive silica of the aggregate. Initially the alkalis increase the concentration of hydroxyl ions in the solution, and the expansive gel production (Thomas, 2011; Evaluation of the aggregates used in the metropolitan region of Salvador regarding the occurrence of alkali-aggregate reactions (AAR) D. V. Ribeiro, R. O. Rey 187 Beyene et al, 2013). ASR can be represented in a simplified form by equations ( 1) and ( 2) (West, 1996apud Campos, 2015.…”

Section: Introductionmentioning

confidence: 99%

“…This pH represents a strongly alkaline liquid in which some acid rocks (aggregates composed of silica and siliceous minerals) do not remain stable (Giordano, 2007). In other words, the presence of alkalis influences the reactivity of the aggregate because the more alkalis available, the higher the concentration of OHin the solution of the pores and, consequently, the more silica will dissolve (Beyene et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Avaliação dos agregados utilizados na região metropolitana de Salvador quanto à ocorrência de Reatividade Álcalis-Agregado (RAA)

Ribeiro

Rey

2019

Revista de la Asociación Latinoamericana de Control de Calidad,

View full text Add to dashboard Cite

O presente artigo avaliou a RAA dos agregados utilizados na região metropolitana de Salvador e o uso de adições minerais, a fim de mitigar essa reação. Empregou-se o método acelerado de barras de argamassa, preconizado pela NBR 15577-4: 2008. Os resultados indicam que os agregados miúdos da região metropolitana de Salvador apresentam baixa reatividade, entretanto, os agregados graúdos apresentaram elevada reatividade e que adições minerais com características pozolânicas podem mitigar a RAA. Este estudo, apesar de se limitar às condições utilizadas, é inédito no Estado da Bahia e apresenta elevado índice de originalidade por utilizar teores de adições superiores às convencionais. Concluiu-se neste estudo que a microssílica, se utilizada em teores muito elevados, pode, inclusive, acelerar a reação.

show abstract

Alkali Silica Reaction (ASR) as a root cause of distress in a concrete made from Alkali Carbonate Reaction (ACR) potentially susceptible aggregates

Cited by 31 publications

References 4 publications

Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain)

Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain)

Analysis of Long-Term Deterioration Characteristics of High Voltage Insulators

Avaliação dos agregados utilizados na região metropolitana de Salvador quanto à ocorrência de Reatividade Álcalis-Agregado (RAA)

Contact Info

Product

Resources

About