Microscopic assessment of recycled concrete aggregate (RCA) mixtures affected by alkali-silica reaction (ASR)

Trottier, Cassandra; Zahedi, Andisheh; Ziapour, Rouzbeh; Sanchez, Leandro; Locati, Francisco

doi:10.1016/j.conbuildmat.2020.121250

Cited by 24 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the RCAs used here and in [4] were not from the same source or of the same composition. The findings of this paper, on the other hand, are in agreement with the other research work [7]. The reason for the independence of the RCA reactivity on the level of deterioration of the source concrete could be that when processing RCA from the barriers or old elements, fresh faces of the original stone are being exposed, leading to similar expansion regardless of the original level of deterioration [2].…”

Section: Expansion Of Lab-prepared Concretes and Efficacy Of Silanesupporting

confidence: 91%

“…The original aggregate used in the demolished structure has a major impact on the RCA usability, and different precautions may need to be taken. For instance, an RCA produced from a structure that has suffered alkali-silica reaction (ASR) may continue to cause expansion if used in a new structure without preventive measures [1][2][3][4][5][6][7][8][9]. In reality, more than one deterioration mechanism is likely co-occurring.…”

Section: Introductionmentioning

confidence: 99%

“…RCA produced from concrete suffering ASR was found to cause significant expansion when used as aggregate in lab-prepared concrete prisms [1][2][3][4][5][6][7][8][9]. The expansion of concrete prisms with a natural reactive limestone (Spratt) from Ottawa, Ontario, was slightly lower than new concrete prisms made with RCA containing the same reactive aggregate [2].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A study into the alkali-silica reactivity of recycled concrete aggregates and the role of the extent of damage in the source structures: Evaluation, accelerated testing, and preventive measures

Piersanti

Shehata

2022

Cement and Concrete Composites

View full text Add to dashboard Cite

Section: Expansion Of Lab-prepared Concretes and Efficacy Of Silanesupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A study into the alkali-silica reactivity of recycled concrete aggregates and the role of the extent of damage in the source structures: Evaluation, accelerated testing, and preventive measures

Piersanti

Shehata

2022

Cement and Concrete Composites

View full text Add to dashboard Cite

“…Petrographic analysis is important to identify the presence or not of minerals responsible for the alkali–silica reaction [ 38 , 39 ]. It is generally associated with the presence of alkali (sodium and potassium) in the cement and of amorphous or poorly crystalline silica in some aggregates.…”

Section: Methodsmentioning

confidence: 99%

Petrographic and Physical-Mechanical Investigation of Natural Aggregates for Concrete Mixtures

2021

View full text Add to dashboard Cite

The availability of different lithology with which concrete can be packaged could create substantial questions on the differences that they can provide to the same mixture. Different kinds of aggregates were analyzed individually to investigate their main characteristics, which allowed us to package five types of concrete mixtures. These five mixtures were compared to each other through compressive strength values. Furthermore, it was considered microscopically what possible differences could exist between these different mixtures, for example, differences in the cement/aggregate reaction. The chemical characterization of the aggregates, used as the skeleton of the cement mixes, was proposed as an important investigative phase in order to better understand the differences in the geotechnical and physical-mechanical characteristics and to verify the presence of any harmful phases for the durability of the concrete.

show abstract

“…Using a stereomicroscope at 16× magnification, distress features (i.e., cracks) are counted in 1 cm × 1 cm squares drawn on the surface of a polished concrete section after which weighting factors [71] are applied to those features to balance their relative importance towards the distress mechanism and normalized to 100 cm 2 for comparative purposes. Moreover, the extended version of the DRI (i.e., without applying weighting factors) can be used to evaluate the crack propagation and distribution within a CC [66,68] as well as recycled concrete [72][73][74].…”

Section: The Damage Rating Index (Dri)mentioning

confidence: 99%

Freezing and Thawing Resistance of Fine Recycled Concrete Aggregate (FRCA) Mixtures Designed with Distinct Techniques

et al. 2022

Self Cite

View full text Add to dashboard Cite

The pressure to use sustainable materials and adopt practices reducing the carbon footprint of the construction industry has risen. Such materials include recycled concrete aggregates (RCA) made from waste concrete. However, concrete made with RCA often presents poor fresh and hardened properties along with a decrease in its durability performance, especially when using its fine fraction (i.e., FRCA). Most studies involving FRCA use direct replacement methods (DRM) to proportion concrete although other techniques are available such as the Equivalent Volume (EV) and Particle Packing Models (PPMs); yet their impact on the durability performance, especially its performance against freezing and thawing (F/T), remains unknown. This work, therefore, appraises the F/T resistance of FRCA mixtures proportioned through various mix proportioning techniques (i.e., DRM, EV and PPMs), produced with distinct crushing processes (i.e., crusher’s fines vs. finely ground). The results show that the mix design technique has a significant influence on the FRCA mixture’s F/T resistance where PPM-proportioned mixtures demonstrate the best overall performance, exceeding the specified requirements while DRM-proportioned mixtures failed F/T resistance requirements. Moreover, the crushing process plays an important role in the recycled mixtures’ cracking behavior under F/T cycles, where less processing leads to fewer cracks while remaining the most sustainable option overall.

show abstract

Microscopic assessment of recycled concrete aggregate (RCA) mixtures affected by alkali-silica reaction (ASR)

Cited by 24 publications

References 31 publications

A study into the alkali-silica reactivity of recycled concrete aggregates and the role of the extent of damage in the source structures: Evaluation, accelerated testing, and preventive measures

A study into the alkali-silica reactivity of recycled concrete aggregates and the role of the extent of damage in the source structures: Evaluation, accelerated testing, and preventive measures

Petrographic and Physical-Mechanical Investigation of Natural Aggregates for Concrete Mixtures

Freezing and Thawing Resistance of Fine Recycled Concrete Aggregate (FRCA) Mixtures Designed with Distinct Techniques

Contact Info

Product

Resources

About