scholarly journals Experimental Evaluation of Engineered Cementitious Composites as Reflective Crack Control Interlayer for Composite Pavements

2019 ◽  
Vol 271 ◽  
pp. 07002 ◽  
Author(s):  
Mohammad Bhuyan ◽  
Mohammad Khattak ◽  
Qian Zhang ◽  
Emilee Schlader
Keyword(s):  
High Performance ◽  
Image Correlation ◽  
Reflective Cracking ◽  
Test Protocol ◽  
Crack Control ◽  
Traffic Loads ◽  
High Performance Fiber ◽  
Composite Pavements ◽  
Strength And Ductility ◽  
Dic Technique

Reflective cracking at transverse joints is considered as a predominant distress in composite pavements. Various interlayers have been used previously to prevent or retard reflective cracking. Engineered cementitious composite (ECC) is a special type of high-performance fiber-reinforced cementitious material that is expected to perform better as an interlayer due to its higher tensile strength and ductility. This study aims to evaluate the effectiveness of ECC as an interlayer system experimentally. A laboratory test protocol was designed to simulate repeated traffic loads to measure the fatigue performance of ECC interlayer system using digital image correlation (DIC) technique. It was found that the composite pavement specimens with ECC interlayer provided significantly higher fatigue life as compared to the control specimens without interlayer. This result indicates that ECC could be used as a potential effective interlayer system to retard or mitigate reflective cracking.

Fostering a Cast-in-Place Steel-UHPFRC Connector for Ductile Timber-Concrete Composite Structures: Parametric Study of the Shear Behaviour and Design Considerations

2019 ◽  
Author(s):  
Nicolas Naud ◽  
Luca Sorelli ◽  
Alexander A Salenikovich ◽  
Samuel Cuerrier-Auclair
Keyword(s):  
Composite Structures ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Shear Behaviour ◽  
Structural Failure ◽  
Design Considerations ◽  
Winkler Model ◽  
Connection System ◽  
High Performance Fiber ◽  
Strength And Ductility

Timber-concrete composite (TCC) structures provide a breakthrough solution for multi-storey buildings. Besides the importance of the connection stiffness, recent research has focused on ductile connectors. This work aims at developing an economic new cast-in-place connector to guarantee the suitable stiffness and structural ductility. A new composite connector has been developed by combining an Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) shell with an embedded inner steel rod. The former governs the connection stiffness, while the latter governs the connection strength and ductility. In order to realize a cast-in-place construction method, a wide experimental investigation on the connection shear behaviour with different geometry was carried out. Secondly, the results were analysed by Winkler model which allowed to define a simplified formula. Finally, a design example of the ductile connectors is presented with emphasis on the importance of a smart design of the connection system for avoiding a brittle structural failure.

scholarly journals Detection and Measurement of Matrix Discontinuities in UHPFRC by Means of Distributed Fiber Optics Sensing

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3883
Author(s):  
Bartłomiej Sawicki ◽  
Antoine Bassil ◽  
Eugen Brühwiler ◽  
Xavier Chapeleau ◽  
Dominique Leduc
Keyword(s):  
Fiber Optics ◽  
Health Monitoring ◽  
High Performance ◽  
Crack Detection ◽  
Measurement Techniques ◽  
Image Correlation ◽  
High Performance Fiber ◽  
Industrial Use ◽  
Opening And Closing ◽  
Detection And Localization

Following the significant improvement in their properties during the last decade, Distributed Fiber Optics sensing (DFOs) techniques are nowadays implemented for industrial use in the context of Structural Health Monitoring (SHM). While these techniques have formed an undeniable asset for the health monitoring of concrete structures, their performance should be validated for novel structural materials including Ultra High Performance Fiber Reinforced Cementitious composites (UHPFRC). In this study, a full scale UHPFRC beam was instrumented with DFOs, Digital Image Correlation (DIC) and extensometers. The performances of these three measurement techniques in terms of strain measurement as well as crack detection and localization are compared. A method for the measurement of opening and closing of localized fictitious cracks in UHPFRC using the Optical Backscattering Reflectometry (OBR) technique is verified. Moreover, the use of correct combination of DFO sensors allows precise detection of microcracks as well as monitoring of fictitious cracks’ opening. The recommendations regarding use of various SHM methods for UHPFRC structures are given.

Retrofit Using Increased Section Area Method of Artificially Perforated Shear Wall in Existing Wall Dominant Structure

2006 ◽  
Vol 324-325 ◽  
pp. 639-642
Author(s):  
Chang Sik Choi ◽  
Yun Cheul Choi ◽  
Hyun Do Yun
Keyword(s):  
High Performance ◽  
Axial Stress ◽  
Shear Wall ◽  
High Pressure Pump ◽  
Section Area ◽  
Different Types ◽  
High Performance Fiber ◽  
Dominant Structure ◽  
Fiber Reinforced Cementitious Composites ◽  
Strength And Ductility

The characteristics relating to high tensile ductility, High Performance Fiber Reinforced Cementitious Composites (HPFRCC) are being so that studied it’ll be adopted in repair and retrofit of buildings. A series of three shear wall specimens were tested under constant axial stress and reversed cyclical lateral loading in order to evaluate the seismic retrofit that had been proposed for the shear wall with the opening. The retrofit involved the use of ECC and MDF, both of which are sprayed through the high pressure pump, over the entire face of the wall. The results indicate that two different types of retrofitting strategies cause the different effects on the strength and ductility of each specimen.

Mechanical Properties of Fiber Reinforced Lime-Based Mortars Evaluated from Four-Point Bending Test

2016 ◽  
Vol 821 ◽  
pp. 526-531
Author(s):  
Michal Přinosil ◽  
Petr Kabele
Keyword(s):  
Thermal Effects ◽  
High Performance ◽  
Correlation Method ◽  
Image Correlation ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Four Point Bending ◽  
High Performance Fiber ◽  
Bending Behavior ◽  
Four Point Bending Test

In the study, the bending behavior of high-performance fiber reinforced lime-based mortars is experimentally investigated using four-point bending test. From the experimental data, the influence of the mortar’s composition on its stiffness, cracking strength and ultimate strength are investigated. It is also studied, whether the response has strain-softening or strain-hardening character and whether the material exhibits multiple cracking. Such behavior is very important for the durability of the material, because it allows carrying load during imposed deformations (due to thermal effects, movements of foundations, seismicity, etc.). The number of formed cracks is examined using digital image correlation method. The mortar composition is considered with two types of binder (pure lime, lime-metakaolin), with two types of polyvinyl alcohol fibers in four volume fractions (0.5÷2.0%). As the reference, we consider two sets of specimens made of plain mortar without fiber reinforcement.

Influence of technological factors on the properties of ultra-high-performance fiber reinforced concrete

2020 ◽  
pp. 135-147
Author(s):  
Igor Chilin ◽  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Technological Factors ◽  
High Performance Fiber

Приведены результаты исследований и выполнена оценка влияния технологических факторов на реологические свойства самоуплотняющихся сталефибробетонных смесей, определены кратковременные и длительные физико-механические и деформативные характеристики сверхвысокопрочного сталефибробетона, включая определение его фактической морозостойкости.

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