Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Structural Engineering
Bond Of Steel Reinforcement With Microwave Cured Concrete Repair Mortars, P. S. Mangat, Shahriar Abubakri, Konstantinos Grigoriadis
Bond Of Steel Reinforcement With Microwave Cured Concrete Repair Mortars, P. S. Mangat, Shahriar Abubakri, Konstantinos Grigoriadis
Henry M. Rowan College of Engineering Faculty Scholarship
This paper investigates the effect of microwave curing on the bond strength of steel reinforcement in concrete repair. Pull-out tests on plain mild steel reinforcement bars embedded in four repair materials in 100 mm cube specimens were performed to determine the interfacial bond strength. The porosity and pore structure of the matrix at the steel interface, which influence the bond strength, were also determined. Test results show that microwave curing significantly reduces the bond strength of plain steel reinforcement. The reduction relative to normally cured (20 °C, 60% RH) specimens is between 21 and 40% with low density repair materials …
Effect Of Austempering Time On The Microstructure And Carbon Partitioning Of Ultrahigh Strength Steel 56nicrmov7, Quanshun Luo, Matthew Kitchen, Shahriar Abubakri
Effect Of Austempering Time On The Microstructure And Carbon Partitioning Of Ultrahigh Strength Steel 56nicrmov7, Quanshun Luo, Matthew Kitchen, Shahriar Abubakri
Henry M. Rowan College of Engineering Faculty Scholarship
Ultrahigh strength steel 56NiCrMoV7 was austempered at 270 °C for different durations in order to investigate the microstructure evolution, carbon partitioning behaviour and hardness property. Detailed microstructure has been characterised using optical microscopy and field emission gun scanning electron microscopy. A newly developed X-ray diffraction method has been employed to dissolve the bainitic/martensitic ferrite phase as two sub-phases of different tetragonal ratios, which provides quantitative analyses of the carbon partitioning between the resultant ferrites and the retained austenite. The results show that, a short-term austempering treatment was in the incubation period of the bainite transformation, which resulted in maximum hardness …
Bond Between Microwave Cured Repair And Concrete Substrate, Konstantinos Grigoriadis, P. S. Mangat, Shahriar Abubakri
Bond Between Microwave Cured Repair And Concrete Substrate, Konstantinos Grigoriadis, P. S. Mangat, Shahriar Abubakri
Henry M. Rowan College of Engineering Faculty Scholarship
The bond strength between a concrete substrate and repair patch is critical to its durability. This paper investigates the effect of microwave curing the freshly applied repair, for 45 min at 132 Watts, on the 28 day bond strength between substrate concrete and different commercial repair materials. The repairs were applied at different ambient temperatures of 20, 10, 2 and −5 °C. Tensile split tests on repaired cube specimens were performed to determine the interfacial bond strength. The ability of microwave curing to prevent the detrimental effects of freezing at early age on the bond and compressive strength of repair …