Abstract
Multifunctional Cementitious Composite (MCC) characteristics are directly related to the type and dosage of the Electrically Conductive Materials (ECMs) reinforcing the relevant concrete matrices. This study investigated the electro-mechanical capacities of fiber reinforced concrete pavement (FRCP) with and without the addition of micro scale-carbon fiber (CF). The impact energy of FRCP under compacted load was evaluated initially; then, the effects of 0.5% and 1% content by volume of CF on the piezoresistivity capacities of FRCP were investigated under applied impact load. This type of load is the most common force causing long-term rigid pavement deterioration. Obtained results showed that the use of a hybrid fiber (micro-scale carbon fiber 0.5% and macro-scale steel fiber 1% by volume) enhanced the impact strength (impact energy) due to CF’s resistance to micro-cracks. The developed FRCP showed good results in terms of self-sensing under compact load with both 0.5 and 1.0% by volume of CF.
Highlights
Many constructional structures are likely to be exposed to impact forces over time
When the carbon fibers (CF) was added beyond 0.5%vol, it was observed a slight reduction in impact energy, which can be attributed to the increased air voids content in the concrete matrix at a high dosage of CF that led to the weak bond strength of fiber-matrix [57]
This study examined the comparative impact energy behaviors among macro-end hook steel fiber, microscale carbon fiber, and hybrid fiber of fiber reinforced concrete pavement (FRCP) under impact load
Summary
Many constructional structures are likely to be exposed to impact forces over time. Impact forces may be of many shapes and for various reasons. Self-sensing materials, sometimes called multifunctional or smart materials [16] come in various forms, with additions including carbon fiber, steel fiber, carbon nanotubes (CNTs), carbon black, nickel powder, graphite powder, and steel slag having been used to increase electrical conductivity and piezoelectricity in cement-based construction materials [9,10,11,12,13,14,15, 17,18,19,20,21,22] The main objectives of the study were to evaluate the effects of different fibers utilization on the impact energy and the effects of CF content on the self-sensing capabilities of FRCP under impact load
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