scholarly journals Shear Performance of Fiber-Reinforced Cementitious Composites Beam-Column Joint Using Various Fibers

2017 ◽  
Vol 3 (2) ◽  
pp. 383
Author(s):  
Faizal Hanif ◽  
Toshiyuki Kanakubo
Keyword(s):  
Shear Failure ◽  
Volume Fraction ◽  
Precast Concrete ◽  
Shear Capacity ◽  
Cementitious Composites ◽  
Fiber Types ◽  
Fiber Reinforced ◽  
Loading Test ◽  
Shear Performance ◽  
Fiber Reinforced Cementitious Composites

Increasing demands of reinforcement in the joint panel are now requiring more effective system to reduce the complicated fabrication by widely used precast system. The joint panel is responsible to keep the load transfer through beam and column as a crucial part in a structural frame that ensures the main feature of the whole structure during earthquake. Since precast system might reduce the joint panel monolithic integrity and stiffness, an innovation by adding fiber into the grouting system will give a breakthrough. The loading test of precast concrete beam-column joints using FRCC (Fiber-Reinforced Cementitious Composites) in joint panel was conducted to evaluate the influences of fiber towards shear performance. The experimental factor is fiber types with same volume fraction in mortar matrix of joint panel. Two specimens with Aramid-fiber and PP-fiber by two percent of volume fraction are designed to fail by shear failure in joint panel by reversed cyclic testing method. The comparison amongst those experiment results by various parameters for the shear performance of FRCC beam-column joints using various fibers are discussed. Preceding specimens was using no fiber, PVA fiber, and steel fiber has been carried out. Through the current experimental results and the comparison with previous experiment results, it can be recognized that by using fibers in joint panel was observed qualitatively could prevent crack widening with equitable and smaller crack width, improved the shear capacity by widening the hysteretic area, increased maximum load in positive loading and negative loading, and decreased the deformation rate. Elastic modulus properties of fiber are observed to give the most impact towards shear performance.

scholarly journals Residual Tensile Properties and Explosive Spalling of High-Performance Fiber-Reinforced Cementitious Composites Exposed to Thermal Damage

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1608 ◽  
Author(s):  
Gang-Kyu Park ◽  
Gi-Joon Park ◽  
Jung-Jun Park ◽  
Namkon Lee ◽  
Sung-Wook Kim
Keyword(s):  
Exposure Time ◽  
High Performance ◽  
Volume Fraction ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Explosive Spalling ◽  
Synthetic Fibers ◽  
Matrix Strength ◽  
High Performance Fiber ◽  
Fiber Reinforced Cementitious Composites

This study examined the effect of adding synthetic fibers, that is, polypropylene (PP) and nylon (Ny), on explosive spalling and residual tensile mechanical properties of high-performance fiber-reinforced cementitious composites (HPFRCCs). Three different matrix strengths (100 MPa, 140 MPa, and 180 MPa), four different volume contents of the synthetic fibers (0%, 0.2%, 0.4%, and 0.6%), and three different exposure time (1 h, 2 h, and 3 h) based on the Internatinoal Organization for Standardization (ISO) fire curve were adopted as variables for this experiment. The experimental results revealed that the addition of synthetic fibers improved the resistance to explosive spalling induced by high-temperature, especially when PP and Ny were mixed together. For a higher matrix strength, greater volume content of the synthetic fibers was required to prevent explosive spalling, and higher residual strengths were obtained after the fire tests. An increase in the volume fraction of the synthetic fibers clearly prevented explosive spalling but did not affect the residual tensile strength. In the case of a higher matrix strength, a reduction in the strength ratio was observed with increased exposure time.

Uniaxial Tensile Experiment on PVA Fiber Reinforced Cementitious Composites

2013 ◽  
Vol 438-439 ◽  
pp. 270-274
Author(s):  
Hai Long Wang ◽  
Guang Yu Peng ◽  
Yue Jing Luo ◽  
Xiao Yan Sun
Keyword(s):  
Volume Fraction ◽  
Ultimate Strain ◽  
Mineral Admixtures ◽  
Uniaxial Tensile ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Tensile Experiment ◽  
Fiber Reinforced Cementitious Composites ◽  
Uniaxial Tensile Experiment

Engineered cementitious composite (ECC) is a representative of the new generation of high performance fiber reinforced cementitious composites. To reveal the influence of mineral admixtures on the tensile mechanical characteristics of polyvinyl alcohol fiber reinforced engineered cementitious composites (PVA-ECC), the tensile properties of PVA-ECC with replacing cement by a significant amount of fly ash (FA), silica fume (SF) and metakaolin (MK) was experimentally investigated. Uniaxial tensile experiment was carried out using rectangular thin plate with sizes of 400×100×15mm3. Results from uniaxial tensile tests show that these mineral admixtures can improve the properties of PVA-ECC. The composite can achieve an ultimate strain of 2.0%, as well as an ultimate strength of 4.0MPa, with a moderate fiber volume fraction of 2.0%. In addition, the composites with FA, SF and MK show saturated multiple cracking characteristics with crack width at ultimate strain limited to below 175μm.

scholarly journals Self-Healing Potential and Post-Cracking Tensile Behavior of Polypropylene Fiber-Reinforced Cementitious Composites

2021 ◽  
Vol 5 (5) ◽  
pp. 122
Author(s):  
Mohit Garg ◽  
Pejman Azarsa ◽  
Rishi Gupta
Keyword(s):  
Volume Fraction ◽  
Peak Load ◽  
Polypropylene Fiber ◽  
Cementitious Composites ◽  
Self Healing ◽  
Fiber Reinforced ◽  
Cracking Behavior ◽  
Micro Scale ◽  
Macro Scale ◽  
Fiber Reinforced Cementitious Composites

The use of synthetic fibers as reinforcement in fiber-reinforced cementitious composites (FRCC) demonstrates a combination of better ductile response vis-à-vis metallic ones, enhanced durability in a high pH environment, and resistance to corrosion as well as self-healing capabilities. This study explores the effect of macro- and micro-scale polypropylene (PP) fibers on post-crack energy, ductility, and the self-healing potential of FRCC. Laboratory results indicate a significant change in fracture response, i.e., loss in ductility as curing time increases. PP fiber samples cured for 2 days demonstrated ductile fracture behavior, controllable crack growth during tensile testing, post-cracking behavior, and a regain in strength owing to FRCC’s self-healing mechanism. Different mixes of FRCC suggest an economical mixing methodology, where the strong bond between the PP fibers and cementitious matrix plays a key role in improving the tensile strength of the mortar. Additionally, the micro PP fiber samples demonstrate resistance to micro-crack propagation, observed as an increase in peak load value and shape deformation during compression and tensile tests. Notably, low volume fraction of macro-scale PP fibers in FRCC revealed higher post-crack energy than the higher dosage of micro-scale PP fibers. Lastly, few samples with a crack of < 0.5 mm exhibited a self-healing mechanism, and upon testing, the healed specimens illustrated higher strain values.

scholarly journals Effect of Cold Plasma Treatment of Polymer Fibers on the Mechanical Behavior of Fiber-Reinforced Cementitious Composites

Fibers ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 62
Author(s):  
Noah Thibodeaux ◽  
Daniel E. Guerrero ◽  
Jose L. Lopez ◽  
Matthew J. Bandelt ◽  
Matthew P. Adams
Keyword(s):  
Mechanical Behavior ◽  
Plasma Treatment ◽  
Cold Plasma ◽  
Treatment Time ◽  
Polymer Fibers ◽  
Cementitious Composites ◽  
Fiber Types ◽  
Fiber Reinforced ◽  
The Impact ◽  
Fiber Reinforced Cementitious Composites

Fiber-reinforced cementitious composites (FRCC) are a class of materials made by adding randomly distributed fibers to a cementitious matrix, providing better material toughness through the crack bridging behavior of the fibers. One of the primary concerns with FRCCs is the behavior of the fiber when a crack is formed. The fibers provide a stress-bridging mechanism, which is largely determined by the bond that exists between the concrete and the fiber’s outer surface. While many studies have determined the properties of FRCCs and potential benefits of using specific fiber types, the effects of low temperature or cold plasma treatment of polymer fibers on the mechanical behavior of the composite material are limited. Polymer fibers are notable for their low density, ductility, ease of manufacture, and cost-effectiveness. Despite these advantages, the surface properties of polymers do not enable the bonding potential given by steel or glass fibers when used in untreated FRCC, resulting in pull-out failures before the full displacement capacity of the fiber is utilized. For this reason, modification of the surface characteristics of polymer fibers can aid in higher bonding potential. Plasma treatment is a process wherein surfaces are modified through the kinetics of electrically charged and reactive species in a gaseous discharge environment. This paper is a preliminary study on the use of atmospheric pressure plasma generated at approximately room temperature. This atmospheric, cold plasma treatment is a method for improving the mechanical properties of FRCC using polymeric fibers. In this study, polypropylene and polyvinyl-alcohol fibers were cold plasma treated for 0, 30, 60, and 120 s before being used in cementitious mortar mixtures. Compression and flexure tests were performed using a displacement-based loading protocol to examine the impact of plasma treatment time on the corresponding mechanical performance of the fiber-reinforced cementitious composite. The experimental results obtained from this study indicate that there is a positive correlation between fiber treatment time and post-peak load-carrying capacity, especially for specimens subjected to flexural loading.

scholarly journals Effect of SIFRCCs with Varying Steel Fiber Volume Fractions on Flexural Behavior

2020 ◽  
Vol 10 (6) ◽  
pp. 2072
Author(s):  
Seungwon Kim ◽  
Cheolwoo Park ◽  
Yongjae Kim
Keyword(s):  
Flexural Strength ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Flexural Behavior ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Conventional Concrete ◽  
Volume Fractions ◽  
Fiber Reinforced Cementitious Composites

Conventional concrete is a brittle material with a very low tensile strength as a result of compressive strength and tensile strain. In this study, the flexural behavior characteristics of slurry-infiltrated fiber-reinforced cementitious composites (SIFRCCs) based on slurry-infiltrated fiber concrete (SIFCON), such as high-performance fiber-reinforced cementitious composites (HPFRCCs), were analyzed to maximize the fiber volume fraction and increase resistance to loads with very short working times (such as explosions or impacts). For extensive experimental variables, one fiber aspect ratio and three fiber volume fractions (6%, 5%, and 4%) were designed, and the flexural toughness and strength were figured out with respect to variables. A maximum flexural strength of 45 MPa was presented for a fiber volume fraction of 6%, and it was found that by increasing the fiber volume fraction the flexural strength and toughness increased. The test results with respect to fiber volume fraction revealed that after the initial crack, the load of SIFRCCs frequently increased because of the high fiber volume fraction. In addition to maximum strength, acceptable strength was found, which could have a positive effect on brittle fractures in structures where an accidental load is applied (such as an impact or explosion).

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