Alkali-Silica Reaction Mitigation: State-of-the-Art

Malvar, L. J.; Cline, G D; Burke, Doug F.; Rollings, Raymond S.; Greene, Joey; Sherman, Tom

doi:10.21236/ada526563

Cited by 36 publications

(46 citation statements)

References 15 publications

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“…Selain itu, beberapa keunggulan dari campuran beton yang mengandung material pozolan adalah antara lain, memiliki permeabilitas rendah, mengurangi panas selama proses hidrasi, mengurangi kemungkinan adanya reaksi alkali silika, kekuatan yang meningkat setelah bertambahnya umur beton dan meningkatkan ketahanan terhadap pengaruh sulfat yang berasal dari air laut (Ferraris, 1995;Malvar, et al, 2002).…”

Section: Sifat Fisik Dan Kimia Materials Pozolanunclassified

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Waani

Elisabeth

2017

jts.

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Section: Sifat Fisik Dan Kimia Materials Pozolanunclassified

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Waani

Elisabeth

2017

jts.

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“…Malvar et al (2002) estimated that replacing 25% of all cement used in concrete with SCMs could save the U.S.…”

Section: Sustainability Of Concrete Productionmentioning

confidence: 99%

Survey of the current status of sustainable concrete production in the U.S.

Jin

Chang

Soboyejo

2015

Resources, Conservation and Recycling

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Abstract:The wide use of concrete in construction has significantly impacted energy use and environmental quality. Fortunately, the emergence of sustainable concrete, made with alternative or recycled waste materials, offers great opportunities to improve concrete sustainability. This paper studies the current status of sustainable concrete production in the U.S. through a questionnaire survey. It revealed that the surveyed companies varied largely in their recognition and adoption of supplementary cementitious materials (SCMs) and alternative aggregates (AAs). Of the various alternative materials available, the most widely used by survey participants were limited to the three SCMs (fly ash, slag cement, and silica fume) and two types of aggregates (lightweight and recycled concrete aggregates). Multiple benefits and barriers to the adoption of SCMs and AAs, e.g., concrete properties, cost, and local availability, were also disclosed by survey participants. Statistical comparisons identified differences in sustainable concrete production between ready mixed concrete suppliers and concrete prefabricators, as well as in its applications in structural and nonstructural concrete components. The findings provide a better understanding of the U.S. sustainable concrete production and offer insights into how researchers can help address industry concerns about the implementation of sustainable concrete.

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“…With respect to FA with a higher CaO and alkali content, the low replacement activates the ASR and the "pessimum effect" is present, i.e., the expansion becomes lower instead [1,22]. For FA with 10 % CaO (the limit value for FA when used for CEM II cement) the pessimum effect often occurs for the replacements around 15 % [25]. Obviously, the effect of the SCMs of CEM II will not necessarily be positive in terms of the ASR.…”

Section: Introductionmentioning

confidence: 99%

Alkali-Silica Reactivity of Portland-Composite Cements and Gravel Aggregates

Žvironaitė¹

2018

Ceramics - Silikaty

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The potential alkali-silica reactivity (ASR) of various combinations of Portland-composite cements CEM II/A, and Lithuanian aggregates from three gravel deposits are investigated in this work. These aggregates which contain about (2-4 %) reactive siliceous rocks (mostly rapid reacting opal and slower reacting flint) could possibly be assigned to Class II-S (potentially alkali-reactive). Two indicators were used to assess the effectiveness of the supplementary cementing materials (SCMs)slag (S), fly ash (FA) and burnt shale, which are present up to 20 % in the cement: the expansion of the mortar specimens in a hot alkali solution and the intensity of the ASR-caused surface damage in the warm humid environment (60 °C and 100 % RH). The presence of S (~15 %) and FA (10 %, 15 %, 20 %) in the cements decreases the expansion, but no mitigating effect (in the case of S) or even a stimulating effect (in the case of 10 % and 15 % FA) was observed for the ASR-caused surface damage, the effect only occurred in the case of the threshold content (20 %) of FA in the cement. The stimulating effect of burnt shale (~ 18 %) was observed on both the expansion and surface damage. A strong linear correlation (R = 0.95) between the changes in the flexural strength and expansion was observed in the 28-day specimens when tested according to AAR-2.2.

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Alkali-Silica Reaction Mitigation: State-of-the-Art

Cited by 36 publications

References 15 publications

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Survey of the current status of sustainable concrete production in the U.S.

Alkali-Silica Reactivity of Portland-Composite Cements and Gravel Aggregates

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