Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/222594
Title: A PERFORMANCE ASSESSMENT OF ECC APPLICATIONS ON SEVERELY DEGRADED STRUCTURAL CONCRETE AND AS A BUILDING REINFORCEMENT MATERIAL
Authors: TAY KEI WEE
Keywords: Building
Project and Facilities Management
PFM
Lim Guan Tiong
2012/2013 PFM
Concrete degradation
Concrete repair
ECC
Engineered Cementitious Composites
Performance assessment of building materials
Issue Date: 21-Dec-2012
Citation: TAY KEI WEE (2012-12-21). A PERFORMANCE ASSESSMENT OF ECC APPLICATIONS ON SEVERELY DEGRADED STRUCTURAL CONCRETE AND AS A BUILDING REINFORCEMENT MATERIAL. ScholarBank@NUS Repository.
Abstract: This study addresses the suitability of Engineered Cementitious Composites (ECC) application as a concrete repair, as well as a reinforcement substitute under the Singapore climate in an attempt to address to the rising issues of construction sustainability, which could be addressed via structural repair and retrofitting works. A major determinant underlying the degradation of concrete is identified to be spalling, which is a common problem with existing buildings, especially those with a longer history. It was found out that ECC possess unparalleled physical properties that made it an ideal choice for repair and retrofitting works. It is therefore hypothesized that original structural integrity of the beams can be achieved when ECC is applied as a repair material, and will restore and enhance physical properties of the targeted repair specimen beyond its original intended strength threshold. The hypotheses tested in this study will be verified at the subsequent section. Ordinary Portland Cement (OPC) beams and columns of identical mix ratios were cast and cured under controlled conditions with pre-defined artificial cracks of 10, 20 and 30 millimeters introduced into them during casting situated at the beam soffit, over a length of 1/3rd of the span of the column and the beam. Similarly, columns of 300mm high were fabricated with intentional scaled down cross sectional areas through the creation of a recess of 5, 10 and 15 millimeters on each side of the column. Upon gaining 28 days of strength, the designated concrete beams are repaired using both ECC mortar mix and conventional OPC mortar prior to a further curing period of 28 days. The study has successfully proven that the application of ECC to severely deteriorated structures was able to restore the concrete members to its original structural condition. As for retrofitting works, ECC has shown an improvement in strengths better than its original state in terms of its tensile and compressive strength.
URI: https://scholarbank.nus.edu.sg/handle/10635/222594
Appears in Collections:Bachelor's Theses

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