Enhancing performance of recycled aggregate concrete with supplementary cementitious materials
The substitution of natural coarse aggregates (NCA) by recycled coarse aggregates (RCA) is part of the environmental approach aimed at reducing waste and preserve natural resources. Unfortunately, RCA is of poor quality due to the presence of old mortar attached to its surface. It is characterized b...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
|
| Series: | Cleaner Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772397625000073 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1825206888173666304 |
|---|---|
| author | Abba Fatiha Ezziane Karim Adjoudj Mhamed Abed Farid |
| author_facet | Abba Fatiha Ezziane Karim Adjoudj Mhamed Abed Farid |
| author_sort | Abba Fatiha |
| collection | DOAJ |
| description | The substitution of natural coarse aggregates (NCA) by recycled coarse aggregates (RCA) is part of the environmental approach aimed at reducing waste and preserve natural resources. Unfortunately, RCA is of poor quality due to the presence of old mortar attached to its surface. It is characterized by its low density, high absorption, low rigidity and a poor quality interfacial transition zone (ITZ) which results in a lower quality concrete. This experimental study aims to introduce together with RCA aggregates supplementary cementitious materials (SCM) in order to reduce the decrease in mechanical performance, durability and microstructure of concrete. In a concrete based on RCA aggregates, ordinary cement was replaced with 20% natural pozzolan (NP), 10% limestone powder (LP), 20% ground granulated blast furnace slag (GGBFS) or 10% fumed silica (SF). Concrete was studied in terms of workability, superplasticizer requirements, mechanical strength, water absorption and microstructure. The results reveal that SCM significantly improves the performance of RAC concrete by promoting filling effects, nucleation, pozzolanic reactions and hydraulic activity. In the long term, RAC concrete has a 12% lower strength than OAC concrete. This decrease is reduced to only 3% when using LP and even results in 9% and 28% higher strengths when using GGBFS or SF. Similarly, an improvement in structural porosity up to 28% is observed, which led to a significant reduction in shrinkage strain, ranging from 20% to 44%. |
| format | Article |
| id | doaj-art-95524e92af4444c6a22a9bec16c42480 |
| institution | Kabale University |
| issn | 2772-3976 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Cleaner Materials |
| spelling | doaj-art-95524e92af4444c6a22a9bec16c424802025-02-07T04:48:32ZengElsevierCleaner Materials2772-39762025-03-0115100298Enhancing performance of recycled aggregate concrete with supplementary cementitious materialsAbba Fatiha0Ezziane Karim1Adjoudj Mhamed2Abed Farid3Geomaterials Laboratory University of Hassiba Benbouali of Chlef AlgeriaGeomaterials Laboratory University of Hassiba Benbouali of Chlef AlgeriaGeomaterials Laboratory University of Hassiba Benbouali of Chlef AlgeriaDepartment of Civil Engineering College of Engineering American University of Sharjah United Arab Emirates; Corresponding author.The substitution of natural coarse aggregates (NCA) by recycled coarse aggregates (RCA) is part of the environmental approach aimed at reducing waste and preserve natural resources. Unfortunately, RCA is of poor quality due to the presence of old mortar attached to its surface. It is characterized by its low density, high absorption, low rigidity and a poor quality interfacial transition zone (ITZ) which results in a lower quality concrete. This experimental study aims to introduce together with RCA aggregates supplementary cementitious materials (SCM) in order to reduce the decrease in mechanical performance, durability and microstructure of concrete. In a concrete based on RCA aggregates, ordinary cement was replaced with 20% natural pozzolan (NP), 10% limestone powder (LP), 20% ground granulated blast furnace slag (GGBFS) or 10% fumed silica (SF). Concrete was studied in terms of workability, superplasticizer requirements, mechanical strength, water absorption and microstructure. The results reveal that SCM significantly improves the performance of RAC concrete by promoting filling effects, nucleation, pozzolanic reactions and hydraulic activity. In the long term, RAC concrete has a 12% lower strength than OAC concrete. This decrease is reduced to only 3% when using LP and even results in 9% and 28% higher strengths when using GGBFS or SF. Similarly, an improvement in structural porosity up to 28% is observed, which led to a significant reduction in shrinkage strain, ranging from 20% to 44%.http://www.sciencedirect.com/science/article/pii/S2772397625000073Recycled aggregate concreteSupplementary cementitious materialStrengthPorosityMicrostructure |
| spellingShingle | Abba Fatiha Ezziane Karim Adjoudj Mhamed Abed Farid Enhancing performance of recycled aggregate concrete with supplementary cementitious materials Cleaner Materials Recycled aggregate concrete Supplementary cementitious material Strength Porosity Microstructure |
| title | Enhancing performance of recycled aggregate concrete with supplementary cementitious materials |
| title_full | Enhancing performance of recycled aggregate concrete with supplementary cementitious materials |
| title_fullStr | Enhancing performance of recycled aggregate concrete with supplementary cementitious materials |
| title_full_unstemmed | Enhancing performance of recycled aggregate concrete with supplementary cementitious materials |
| title_short | Enhancing performance of recycled aggregate concrete with supplementary cementitious materials |
| title_sort | enhancing performance of recycled aggregate concrete with supplementary cementitious materials |
| topic | Recycled aggregate concrete Supplementary cementitious material Strength Porosity Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2772397625000073 |
| work_keys_str_mv | AT abbafatiha enhancingperformanceofrecycledaggregateconcretewithsupplementarycementitiousmaterials AT ezzianekarim enhancingperformanceofrecycledaggregateconcretewithsupplementarycementitiousmaterials AT adjoudjmhamed enhancingperformanceofrecycledaggregateconcretewithsupplementarycementitiousmaterials AT abedfarid enhancingperformanceofrecycledaggregateconcretewithsupplementarycementitiousmaterials |