The main objective of this study is to evaluate the workability of fresh portland cement concrete while it is still in the mixing truck by determining fundamental rheological parameters (plastic viscosity and yield stress). Nine concrete mixtures with different values of yield stress and plastic viscosity were tested in a concrete truck. The measurements made with the truck were based on the ty...

The potential for monitoring the construction of post-tensioned concrete beams and detecting damage to the beams under loading conditions was investigated through an experimental program. First, embedded sensors were investigated that could measure pre-stress from the fabrication process to a failure condition. Four types of sensors were installed on a steel frame, and the applicability and the...

Railway lines typically use traditional sloping embankments as the principal means of track support. However, Geosynthetically Reinforced Soil (GRS) systems have gained popularity alternatives to conventional embankments, particularly for high-speed in Japan. This system requires less ground stabilization/improvement and land take than due its smaller base area. research investigates immediate ...

As prestressed concrete sleepers are continuously exposed to various environmental and loading conditions, it is increasingly crucial analyse their current future serviceability performance. In practice, the main cause of cracking in usually induced by impact loads. The most heavily influenced sections midspan rail-seat area sleepers. This paper investigates effects time-dependent strength degr...

Pipes (2003) has proposed a checklist for law enforcement to use in identifying possible members of sleeper cells. The purpose of this research was to evaluate Pipes’ checklist through the judgment of Muslim “insiders.” Thirty-three Muslim insiders responded to Pipes’ checklist by indicating the degree of concern that they believed each item should trigger about a possible sleeper. The sample o...

Recent work suggests that concurrent excitation and inhibition originating in central pattern generators (CPGs) may be used to control rhythmic motoneuronal activity. The specific roles that the inhibition plays in such cases are not well understood, however, in part because of the lack of identification of presynaptic inhibitory neurons. Here we demonstrate that, in the Aplysia feeding CPG, in...

Unsupported sleepers or void zones in ballasted tracks are one of the most recent and frequent track failures. The failures have property intensive development that, without timely maintenance measures, can cause appearance cost-expensive local instabilities such as subgrade damages. reason for lies mechanics sleeper ballast bed interaction. particularity interaction is a dynamic impact that oc...