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Title:	Self-flowing high-strength cementitious composites for ferrocement strengthening of concrete elements
Authors:	Shamir Sakir (P81216)
Supervisor:	Sudharshan N. Raman, Dr.
Keywords:	Reinforced concrete Concrete mixers Concrete -- Additives Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia
Issue Date:	1-Mar-2019
Description:	The necessity for strengthening structures is increasing every day because of deterioration of structures due to loading, aging and environmental factors. An effective retrofitting system can help to improve the structural condition of deteriorated structures, consuming fewer resources and generating a little waste compared to demolition and reconstruction. Ferrocement is a popular choice for strengthening and retrofitting of the concrete structures, for its inherent toughness and crack resisting capacity. However, its labour-intensive nature of construction makes it undesirable for rapid works. This study focuses on developing high-performance ferrocement for the strengthening application. The study is divided into two parts. The first part is focused on the development of a high-strength self-flowing mortar, with a minimum compressive strength of 60 MPa. Lower water-cement ratio and superplasticizing admixture were used to achieve this target. In order to conform to the self-flowing requirement, the cementitious composite mixes were required to achieve a flow diameter of 240 - 260 mm and a mini V-funnel flow time of 7 - 11 secs according to EFNARC guideline. To enhance the strength and durability properties of the mortar, 8-12% of silica fume was added as a replacement of cement. The second part deals with testing the performance of the ferrocement jacket for strengthening. The developed mortar was used as the rendering material of the ferrocement. Fibreglass mesh and wire mesh were used for performance comparison. Concrete specimens of 150 mm diameter and 300 mm height were chosen for this test. Multiple layers and different combinations of fibreglass and wire mesh were applied to check the performance. The same test was repeated using specimens of 100 mm diameter and 200 mm height to check the size effect of the specimens. Previous studies showed that the performance of ferrocement jacket was determined by the mesh strength. The mortar part had a very little contribution to the strength. However, high-strength mortar can provide better confinement alongside the mesh. The self-flowing nature of the fresh mortar mixture eliminates the basic difficulties of placement and ensures good compaction. The strength and ductility were increased by both types of ferrocement jackets. Grade 100 mortar with 4-layer wire mesh was the best performing combination. This jacket combination achieved 62% higher ultimate strain and 29% higher strength than the control sample for 300 mm sample size. Increased mortar strength showed its potential to reduce reinforcement. Besides enhanced capacity, it takes little time and space, which makes it suitable for congested regions. Therefore, it can be considered as an efficient retrofitting method that reduces resource consumption and waste generation; and thus, a progress to the green construction practice.,Master of Science
Pages:	100
Call Number:	TA435.S235 2019 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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