Properties and flexural performance of iron ore tailings concrete

Oritola, Sikiru Folahan

Properties and flexural performance of iron ore tailings concrete

dc.contributor.author	Oritola, Sikiru Folahan
dc.date.accessioned	2024-12-17T03:45:16Z
dc.date.available	2024-12-17T03:45:16Z
dc.date.issued	2017
dc.description	Thesis (PhD (Civil Engineering))
dc.description.abstract	The wide usage of concrete in construction has led to the depletion of natural aggregate resources. Thus, it is vital to search for alternative materials for aggregate replacement. Iron ore tailing (IOTs) is an industrial waste material which is generated worldwide during the iron ore production process. IOTs has the potential to become replacement material for natural aggregate in concrete production. Therefore, this research focuses on assessing the possibility of IOTs to be used as sand replacement and its effects on structural application of concrete. The IOTs materials examined in this study were taken from five different sources and used to replace sand to determine the optimum replacement for concrete grade 30. Fresh and hardened properties of IOTs concrete including its workability, compressive, flexural and tensile strengths, microstructure, expansion and shrinkage, and water resistance characteristics were evaluated. Furthermore, five singly reinforced IOTs concrete beams and one control beam were cast and tested to assess the IOTs effect on the flexural behaviour of the beams. The experimental results show that IOTs composed mainly of silica is an inert material with more fine particles than normal sand. Although the inclusion of IOTs decreased the workability of the concrete because of the much greater surface area of its particles, IOTs improved the cohesiveness of concrete. The best IOTs concrete consisted of 30% sand replacement which recorded higher compressive, flexural and splitting tensile strength than normal concrete by 27%, 20% and 11.4% respectively. In addition, IOTs performed better than the control sample in field emission scanning electron microscopy test which indicated denser interface between the IOTs and the cement paste. IOTs concrete also recorded less drying shrinkage, and higher ultrasonic pulse velocity when compared with the control sample. On the flexural performance, IOTs reinforced concrete beams were found to be better than the control beam with higher stiffness and ultimate load.
dc.description.sponsorship	Universiti Teknologi Malaysia
dc.identifier.uri	https://openscience.utm.my/handle/123456789/1470
dc.publisher	Universiti Teknologi Malaysia
dc.subject	Iron ores
dc.subject	Waste products as building materials
dc.subject	Aggregates (Building materials)—Environmental aspects
dc.title	Properties and flexural performance of iron ore tailings concrete