Assessment of Fracture Process in Forta and Polypropylene Fiber-Reinforced Concrete Using Experimental Analysis and Digital Image Correlation

The fracture response of macro polypropylene fiber reinforced concrete (PPFRC) and hybrid blend of macro and micro polypropylene fiber reinforced concrete (HyFRC) are evaluated at 1, 3, 7 and 28 days. There is an improvement in the early-age fracture response of HyFRC compared to PPFRC. The changing cohesive stress-crack separation relationship produced by ageing of the concrete matrix is determined from the fracture test responses. An improved early-age cohesive stress response is obtained from the hybrid blend containing micro and macro fibers. The hybrid fiber blend also has a higher tensile strength at early age when compared to an identical volume fraction of macro polypropylene fibers.

Download Full-text

Influence of the Fiber Volume Content on the Durability-Related Properties of Polypropylene-Fiber-Reinforced Concrete

Sustainability ◽

10.3390/su12020549 ◽

2020 ◽

Vol 12 (2) ◽

pp. 549

Author(s):

Chenfei Wang ◽

Zixiong Guo ◽

Ditao Niu

Keyword(s):

Reinforced Concrete ◽

Flexural Strength ◽

Volume Content ◽

Polypropylene Fiber ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Fiber Volume ◽

Freeze Thaw ◽

Chloride Environment ◽

Polypropylene Fiber Reinforced Concrete

Polypropylene-fiber-reinforced concrete impacts the early shrinkage during the plastic stage of concrete, and the fiber volume content influences the durability-related properties of concrete. The purpose of this paper was to investigate the influence of fiber volume content on the mechanical properties, durability, and chloride ion penetration of polypropylene-fiber-reinforced concrete in a chloride environment. Tests were carried out on cubes and cylinders of polypropylene-fiber-reinforced concrete with polypropylene fiber contents ranging from 0% to 0.5%. Extensive data from flexural strength testing, dry–wet testing, deicer frost testing, and chloride penetration testing were recorded and analyzed. The test results show that the addition of the fiber improves the failure form of the concrete specimens, and 0.1% fiber content maximizes the compactness of the concrete. The flexural strength of specimen C2 with 0.1% fiber shows the highest strength obtained herein after freeze–thaw cycling, and the water absorption of specimen C2 is also the lowest after dry–wet cycling. The results also indicate that increasing the fiber volume content improves the freeze–thaw resistance of the concrete in a chloride environment. Chlorine ions migrate with the moisture during dry–wet and freeze–thaw cycling. The chlorine ion diffusion coefficient (Dcl) increases with increasing fiber content, except for that of specimen C2 in a chloride environment. The Dcl during freeze–thaw cycling is much higher than that during dry–wet cycling.

Download Full-text

Experimental Investigation on Damage Behavior of Polypropylene Fiber Reinforced Concrete under Compression

International Journal of Concrete Structures and Materials ◽

10.1186/s40069-018-0302-3 ◽

2018 ◽

Vol 12 (1) ◽

Cited By ~ 8

Author(s):

Lihua Xu ◽

Biao Li ◽

Xiaoxiao Ding ◽

Yin Chi ◽

Changning Li ◽

...

Keyword(s):

Experimental Investigation ◽

Reinforced Concrete ◽

Polypropylene Fiber ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Damage Behavior ◽

Polypropylene Fiber Reinforced Concrete

Download Full-text

DURABILITY PERFORMANCE AND DIMENSIONAL STABILITY OF POLYPROPYLENE FIBER REINFORCED CONCRETE

Journal of Green Building ◽

10.3992/1943-4618.13.2.20 ◽

2018 ◽

Vol 13 (2) ◽

pp. 20-41 ◽

Cited By ~ 1

Author(s):

Ali Mardani-Aghabaglou ◽

Süleyman Özen ◽

Muhammet Gökhan Altun

Keyword(s):

Reinforced Concrete ◽

Dimensional Stability ◽

Polypropylene Fiber ◽

Pulse Velocity ◽

Fiber Reinforced Concrete ◽

Concrete Mixture ◽

Fiber Reinforced ◽

Concrete Mixtures ◽

Durability Performance ◽

Polypropylene Fiber Reinforced Concrete

In this study, the durability performance and dimensional stability of polypropylene fiber reinforced concrete mixture were investigated. For this purpose, two series of concrete mixtures, including a 0.45 water/cement ratio was prepared both in the absence and presence of fiber. A CEMI 42.5 R type portland cement and crushed limestone aggregate with a maximum particle size of 25 mm were used. In addition to the control mixture without fiber, three different concrete mixtures were prepared by adding polypropylene fiber as 0.4%, 0.8% and 1% of total volume into the mixture. The time-dependent fresh state properties, strength, ultrasonic pulse velocity, transport properties, drying shrinkage and freeze-thaw resistance of concrete mixtures, sodium sulfate attack and abrasion were investigated comparatively. Test results demonstrated that utilization of fiber affected the fresh properties of the concrete mixtures negatively. However, the 0.8% fiber-bearing mixture showed the highest performance in terms of durability and dimensional stability. Beyond this utilization ratio, the durability performance of the concrete mixture was negatively affected. The risk of nonhomogeneous dispersion of the fiber in the mixture was relatively high in the excess fiber-bearing mixture. Consequently, with the formation of flocculation in the mixture the void ratio of concrete mixture increased.

Download Full-text