Effects of Redispersible Polymer Powder on Mechanical and Durability Properties of Preplaced Aggregate Concrete with Recycled Railway Ballast
Abstract The rapid-hardening method employing the injection of calcium sulfoaluminate (CSA) cement mortar into voids between preplaced ballast aggregates has recently emerged as a promising approach for the renovation of existing ballasted railway tracks to concrete tracks. This method typically inv...
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doaj-6227b11a660f43f6a27d7e0a75a6db642020-11-25T01:50:10ZengSpringerOpenInternational Journal of Concrete Structures and Materials1976-04852234-13152018-11-0112111710.1186/s40069-018-0304-1Effects of Redispersible Polymer Powder on Mechanical and Durability Properties of Preplaced Aggregate Concrete with Recycled Railway BallastSahyeon Lee0Seung Yup Jang1Chan Young Kim2Eun Jong Ahn3Seung Pil Kim4Seongwoo Gwon5Myoungsu Shin6School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)Korea National University of TransportationSchool of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST)Abstract The rapid-hardening method employing the injection of calcium sulfoaluminate (CSA) cement mortar into voids between preplaced ballast aggregates has recently emerged as a promising approach for the renovation of existing ballasted railway tracks to concrete tracks. This method typically involves the use of a redispersible polymer powder to enhance the durability of the resulting recycled aggregate concrete. However, the effects of the amount of polymer on the mechanical and durability properties of recycled ballast aggregate concrete were not clearly understood. In addition, the effects of the cleanness condition of ballast aggregates were never examined. This study aimed at investigating these two aspects through compression and flexure tests, shrinkage tests, freezing–thawing resistance tests, and optical microscopy. The results revealed that an increase in the amount of polymer generally decreased the compressive strength at the curing age of 28 days. However, the use of a higher polymer ratio enhanced the modulus of rupture, freezing–thawing resistance, and shrinkage resistance, likely because it improved the microstructure of the interfacial transition zones between recycled ballast aggregates and injected mortar. In addition, a higher cleanness level of ballast aggregates generally improved the mechanical and durability qualities of concrete.http://link.springer.com/article/10.1186/s40069-018-0304-1railway ballastconcrete trackcalcium sulfoaluminate (CSA) cementredispersible polymer powderpreplaced aggregate concreteinterfacial transition zone (ITZ) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sahyeon Lee Seung Yup Jang Chan Young Kim Eun Jong Ahn Seung Pil Kim Seongwoo Gwon Myoungsu Shin |
spellingShingle |
Sahyeon Lee Seung Yup Jang Chan Young Kim Eun Jong Ahn Seung Pil Kim Seongwoo Gwon Myoungsu Shin Effects of Redispersible Polymer Powder on Mechanical and Durability Properties of Preplaced Aggregate Concrete with Recycled Railway Ballast International Journal of Concrete Structures and Materials railway ballast concrete track calcium sulfoaluminate (CSA) cement redispersible polymer powder preplaced aggregate concrete interfacial transition zone (ITZ) |
author_facet |
Sahyeon Lee Seung Yup Jang Chan Young Kim Eun Jong Ahn Seung Pil Kim Seongwoo Gwon Myoungsu Shin |
author_sort |
Sahyeon Lee |
title |
Effects of Redispersible Polymer Powder on Mechanical and Durability Properties of Preplaced Aggregate Concrete with Recycled Railway Ballast |
title_short |
Effects of Redispersible Polymer Powder on Mechanical and Durability Properties of Preplaced Aggregate Concrete with Recycled Railway Ballast |
title_full |
Effects of Redispersible Polymer Powder on Mechanical and Durability Properties of Preplaced Aggregate Concrete with Recycled Railway Ballast |
title_fullStr |
Effects of Redispersible Polymer Powder on Mechanical and Durability Properties of Preplaced Aggregate Concrete with Recycled Railway Ballast |
title_full_unstemmed |
Effects of Redispersible Polymer Powder on Mechanical and Durability Properties of Preplaced Aggregate Concrete with Recycled Railway Ballast |
title_sort |
effects of redispersible polymer powder on mechanical and durability properties of preplaced aggregate concrete with recycled railway ballast |
publisher |
SpringerOpen |
series |
International Journal of Concrete Structures and Materials |
issn |
1976-0485 2234-1315 |
publishDate |
2018-11-01 |
description |
Abstract The rapid-hardening method employing the injection of calcium sulfoaluminate (CSA) cement mortar into voids between preplaced ballast aggregates has recently emerged as a promising approach for the renovation of existing ballasted railway tracks to concrete tracks. This method typically involves the use of a redispersible polymer powder to enhance the durability of the resulting recycled aggregate concrete. However, the effects of the amount of polymer on the mechanical and durability properties of recycled ballast aggregate concrete were not clearly understood. In addition, the effects of the cleanness condition of ballast aggregates were never examined. This study aimed at investigating these two aspects through compression and flexure tests, shrinkage tests, freezing–thawing resistance tests, and optical microscopy. The results revealed that an increase in the amount of polymer generally decreased the compressive strength at the curing age of 28 days. However, the use of a higher polymer ratio enhanced the modulus of rupture, freezing–thawing resistance, and shrinkage resistance, likely because it improved the microstructure of the interfacial transition zones between recycled ballast aggregates and injected mortar. In addition, a higher cleanness level of ballast aggregates generally improved the mechanical and durability qualities of concrete. |
topic |
railway ballast concrete track calcium sulfoaluminate (CSA) cement redispersible polymer powder preplaced aggregate concrete interfacial transition zone (ITZ) |
url |
http://link.springer.com/article/10.1186/s40069-018-0304-1 |
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