Waterproofing Slurry Treatment on Coarse Recycled Aggregates.

Saved in:

Bibliographic Details
Title:	Waterproofing Slurry Treatment on Coarse Recycled Aggregates.
Authors:	Rampit-Greaves, Rekha¹ rekha.rampit-greaves@uwi.edu, Smith, Jovanca¹ jovanca.smith@uwi.edu
Source:	West Indian Journal of Engineering. Jan2026, Vol. 48 Issue 2, p46-53. 8p.
Subjects:	Waterproofing, Slurry, Mineral aggregates, Sustainability, Compressive strength, Circular economy, Solidification, Mechanical behavior of materials
Abstract:	For every pound of cement manufactured, approximately 0.9 pounds of carbon dioxide (CO2) is emitted into the atmosphere. Hence, recycling this waste concrete to produce a circular economy will be beneficial. Recycled concrete aggregates (RCAs) contain residual mortar or hardened cementitious paste made up of fine aggregates, hydrated and unhydrated cement particles. This residual mortar is more porous than natural aggregates. The RCAs can also have multiple interfacial transition zones between the residual mortar and the cement matrix, which can decrease the mechanical and durability strengths of the hardened concrete. This study investigated the treatment of RCAs with a solid waterproofing agent and determined whether this could improve the response of the material through densification of the attached RCA mortar. Positive changes were observed in absorption, bulk density, crushing, and impact strengths of treated RCAs, as well as the compressive strength of the concrete. The crystallinity of the treated RCA sample was higher than the untreated RCA sample, suggesting new hydration products. Investigation of the chemical composition of the waterproofing agent showed a high similarity to Ordinary Portland Cement (OPC), limiting its sustainability benefits. The slurry treatment improved the densification and mechanical properties of RCA, but due to its similarity to OPC, it will not be a good sustainable treatment approach for RCAs. [ABSTRACT FROM AUTHOR]
	Copyright of West Indian Journal of Engineering is the property of University of the West Indies, Faculty of Engineering and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Engineering Source

Description
Abstract:	For every pound of cement manufactured, approximately 0.9 pounds of carbon dioxide (CO2) is emitted into the atmosphere. Hence, recycling this waste concrete to produce a circular economy will be beneficial. Recycled concrete aggregates (RCAs) contain residual mortar or hardened cementitious paste made up of fine aggregates, hydrated and unhydrated cement particles. This residual mortar is more porous than natural aggregates. The RCAs can also have multiple interfacial transition zones between the residual mortar and the cement matrix, which can decrease the mechanical and durability strengths of the hardened concrete. This study investigated the treatment of RCAs with a solid waterproofing agent and determined whether this could improve the response of the material through densification of the attached RCA mortar. Positive changes were observed in absorption, bulk density, crushing, and impact strengths of treated RCAs, as well as the compressive strength of the concrete. The crystallinity of the treated RCA sample was higher than the untreated RCA sample, suggesting new hydration products. Investigation of the chemical composition of the waterproofing agent showed a high similarity to Ordinary Portland Cement (OPC), limiting its sustainability benefits. The slurry treatment improved the densification and mechanical properties of RCA, but due to its similarity to OPC, it will not be a good sustainable treatment approach for RCAs. [ABSTRACT FROM AUTHOR]
ISSN:	05115728
DOI:	10.47412/YKUN9203