Abstract
New self-sensing cementitious composites embedded in the highway pavement for vehicle detection and weigh during motion is fabricated. Smart carbon fiber (CF) reinforced cement-based materials with high sensitive property are used as sensors. These smart composites may be able to detect the traffic and sense the weight in motion, thanks to their piezoresistive property. Cement-based sensors capability to vehicle detection was investigated in a real field at the University of Technology campus. Findings clarify that the CF-Based cementitious composites provide have a great potential to use as sensors for detect traffic and its composition also it possibly identifies different vehicular axle loadings (weigh during motion).
Highlights
Traffic detection and weighing in motion are essential parts in management of traffic, design and maintenance
The mixtures that were fabricated in this work consist of common ingredients such as ordinary Portland cement (PC), which is manufactured in Iraq and complies the I.Q.S (5), 1984 [17]; to increase the compressive, tensile and flexural strengths of the specimens, fly ash (FA)/ Class-F was used [18], which is us composites[20] ; silica sand used as fine aggregate with a maximum particle size 300 μm and its specific gravity ofcompatible with ASTM-C618 (2005) requirements [19] it is used to disperse conductive materials within the cementitio 2.6
The sensing mechanism of the cementitious composite sensors as explained by (Han et al, 2012) is the occurrence of changes in the electrical resistance of the sensors when exposed to vehicle loads that followed by changes in the length of the conductive fibers, which leads to changes in the electrical resistance
Summary
Traffic detection and weighing in motion are essential parts in management of traffic, design and maintenance. The feasibility of self-sensing carbon nanotubes (CNT) filled cement-based materials was investigated by Han et al [1] they embedded these sensors into the pavement Their findings indicate that these composites present high accurately to detect passing vehicles. Laboratory work was carried out by Ghadhban et al.[16] to investigate the piezoresistive behaviors of cementitious materials based on measuring the changes in electrical resistivity (ER) with two types of electrically conductive materials CF and steel fiber (SF) to use it for traffic detection where three types of cement-based sensors were evaluated, with CF, SF, or a hybrid of CF and SF, by applying quasi-static and dynamic load cycles after seven days of curing in different load directions reflecting the electrodes and different circuit type connections of the specimens. These smart cementitious-based sensors are embedded into the pathway of the vehicles to set up a self-sensing pavement to examine the feasibility of using it for speed measurement, traffic flow and composition and weighing in motion
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