ORCID Profile
0000-0003-1120-5047
Current Organisation
Ara Institute of Canterbury
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Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2020
Publisher: ISEC Press
Date: 11-2020
DOI: 10.14455/ISEC.2020.7(2).INF-07
Abstract: Foamed Bitumen Stabilization (FBS) is a treatment for strengthening pavements and improving road performance, either on newly constructed or existing roads. The FBS within pavements is typically used in the basecourse layer, where the basecourse material is mixed with cement, bitumen, and water through a milling operation on site. The performance of the Foamed Bitumen Stabilized basecourse can be highly affected by various parameters such as the cement content, bitumen content, the quality of the operation as well as the basecourse aggregate characteristics. In this research, a collection of existing historical FBS mix design data from New Zealand roads are analyzed. The Indirect Tensile Strength (ITS) of the FBS material made of aggregate sourced from two different regions are compared. The results show that the aggregate percentage of fine particles and the plasticity index contributes to the final strength of FBS material. The obtained results are valuable towards optimizing the FBS mix design based on the basecourse aggregate properties.
Publisher: SAGE Publications
Date: 15-04-2009
Abstract: Track geometry, consisting of several parameters, is the main factor influencing the ride quality and track performance. Railway authorities are spending considerably to maintain track geometry conditions within acceptable tolerance. Optimization of this expenditure requires a thorough investigation into the track structural factors influencing the conditions of track geometry. The current methods of track inspection are based on automated inspection of track geometry conditions, using track-recording cars. These methods have their limitations in identifying track structural defects, and in turn, lack the recognition of the causes of track geometry problems. There is a need to develop a track structural inspection and to investigate the relationship between track structural defects and track geometry problems. This research is an attempt to response to this need. The most dominant observable track structural distresses were studied, a track structural inspection method was proposed, and track structural conditions were quantified. A technique was developed to correlate track structural defects to track geometry problems. This technique was applied to tracks with various conditions, carrying out a comprehensive field investigation. The results obtained were analysed to identify the role of each track component on track geometry deviations, and in turn, develop correlations between track structural quality and track geometry conditions.
Publisher: Informa UK Limited
Date: 12-2011
Publisher: Springer Singapore
Date: 23-12-2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2010
Publisher: IEEE
Date: 12-2018
Publisher: Informa UK Limited
Date: 07-03-2018
Publisher: Informa UK Limited
Date: 08-07-2010
Publisher: SAGE Publications
Date: 13-09-2013
Abstract: Manufacturers of insulated rail joints (IRJs) have to follow the quality assurance regime stipulated in the national design standards unfortunately, IRJs still exhibit a very low and highly variable service life. It is widely believed that the service life of IRJs is affected by the track input under the passage of loaded wheels however, there is a paucity of literature with regard to the actual mechanical behaviour of IRJs in the track. An extensive field test was, therefore, conducted on an in-service heavy haul corridor in Australia with the specific aim of understanding the effect of the track input on the response of the IRJs. Data on the wheel–rail force, rail/joint-bar strain, sleeper acceleration and ballast pressure signatures in the time domain were determined from the experiment. This data was subsequently systematically analysed to compare the relative structural merits of two IRJs resting on different sleeper spaces and a reference continuous rail subjected to similar real-life coal traffic loading.
Publisher: ASTM International
Date: 24-07-2020
DOI: 10.1520/GTJ20190249
Publisher: Informa UK Limited
Date: 02-2012
Publisher: Springer Science and Business Media LLC
Date: 15-10-2012
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2013
Publisher: World Scientific Pub Co Pte Lt
Date: 11-2016
DOI: 10.1142/S0219455415500583
Abstract: Rail discontinuities are one of the main sources of wheel impact causing high levels of noise, vibration and stresses in railway track. Even though various multi-body train–track interaction models have been developed in the past decade, accurate modeling and analysis of the track dynamic behavior in the vicinity of rail discontinuities is rare in the literature. In this paper, formulation of a new explicit multi-body dynamic (MBD) model incorporating detailed wagon, wheel–rail subsystems and track containing a rail discontinuity (rail joint) is reported. The predictions of the localized track responses are validated using the data from two gapped rail joints in the field test. The validated model accurately determines the impact forces and dynamic responses. The simulation results provide valuable insight on the behavior of track in vicinity of a rail discontinuity, the sensitivity of the design parameters to the impact forces and the track dynamic responses currently unavailable in the literature.
Publisher: Global Science & Technology Forum ( GSTF )
Date: 25-04-2016
Publisher: ISEC Press
Date: 12-2018
DOI: 10.14455/ISEC.RES.2018.74
Abstract: Continuous vertical force on sleepers gradually degrades the bonding between the concrete and the prestressing strands. In particular, the vertical wheel loads can be significantly lified due to irregularities on the wheel or on the track. This can eventually result in cracking or splitting of concrete along the strands leading to the structural failure of concrete sleepers. The bond between strand and concrete is an important factor which can directly or indirectly influence the cracking and splitting failure of the sleeper. This paper reports a series of pullout tests undertaken on specimens with 85 MPa concrete (nominal strength) and 7-wire prestressing strands replicating typical prestressed concrete sleepers produced in New Zealand. The results are discussed and compared in terms of the loads causing the first strand slip and also the bond stress-slip relationship. The results show that longer water curing time does not necessarily increase the bond between strand and concrete in prestressed concrete sleepers. This behaviour can be attributed to the effect of shrinkage and the trade-off between strength and shrinkage influenced by water curing. The obtained results can contribute to determining optimum sleeper curing time to achieve required strength and bonding and is valuable for concrete sleeper manufacturers where curing process is associated with considerable cost and logistical issues.
Publisher: Springer Science and Business Media LLC
Date: 2012
No related grants have been discovered for Hossein Askarinejad.