INVESTIGATION ON RELATIONSHIP BETWEEN COMPRESSIVE AND
          FLEXURAL STRENGTH OF BINARY BLENDED HYBRID FIBER
          REINFORCED GEOPOLYMER CONCRETE

By adopting the method of orthogonal experimental design, the effect of three independent variables, that is steel fiber fraction, polypropylene fiber fraction and silica fume fraction on the compressive strength, flexural strength and shrinkage of cement mortar was studied. The results indicate that steel fiber is one of the most important factors affecting compressive strength and shrinkage, and polypropylene fiber is one of the most important factors affecting flexural strength and shrinkage of cement mortar. By using deviation analysis to analyze the orthogonal experiment results, the optimized mix proportion of hybrid fiber reinforced cement mortar is determined. The hybrid effect of steel fiber and polypropylene fiber on the properties of cement mortar is discussed.

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Effects of Hybrid Fiber Reinforced Geopolymer Concrete Stabilized with Gypseous Soil-Experimental and Simulation Approach

Surface Review and Letters ◽

10.1142/s0218625x21500700 ◽

2021 ◽

Author(s):

Seetakamalakar Rao ◽

Sanjeet Kumar

Keyword(s):

Geopolymer Concrete ◽

Simulation Approach ◽

Fiber Reinforced ◽

Hybrid Fiber ◽

Gypseous Soil

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Experimental Study of the Mechanical Properties of Hybrid Fiber Reinforced Concrete

Materials Science Forum ◽

10.4028/www.scientific.net/msf.610-613.69 ◽

2009 ◽

Vol 610-613 ◽

pp. 69-75

Author(s):

Yuan Hua ◽

Tai Quan Zhou

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Reinforced Concrete ◽

Aspect Ratio ◽

Flexural Strength ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Hybrid Fiber ◽

Reinforced Fiber ◽

Reinforced Materials

Different kinds of fiber are used to reinforce the concrete to improve the concrete mechanical properties. The high modulus and high flexibility fibers are often used to reinforce in the cement base, which leads to the higher performance compound cement based materials. In the paper, the carbon fiber and glass fiber material are used as flexibility reinforced materials. The polypropylene fiber and the polyethylene fiber are used as strength reinforced materials. The combinations of the flexibility reinforced fiber and strength reinforced fiber are chosen as C-P HF (Carbon and Polypropylene Hybrid Fiber) and G-Pe HF (Glass and Polyethylene Hybrid Fiber). The concrete mixture ratio and the fiber-reinforced amount are determined to the author’s previous study. The relationship between compressive strength, flexural strength and length/diameter aspect ratio of fiber for the carbon and polypropylene hybrid fiber reinforced concrete (C-P HFRC), and for the glass and polyethylene hybrid fiber reinforced concrete (G--Pe HFRC) was tested and discussed. The testing results show that length/diameter aspect ratio of fiber obviously affects the flexural strength of C-P HFRC and G-Pe HFRC, though the compressive strength is slightly affected by the length-diameter aspect ratio.

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Assessment of Self-Consolidation Concrete Produced with Micro Steel and Macro Synthetic Polyolefin Fibers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1002.594 ◽

2020 ◽

Vol 1002 ◽

pp. 594-603

Author(s):

Dalya H. Hameed ◽

Abeer Abduljabbar Al-Saeedi

Keyword(s):

Compressive Strength ◽

Flexural Strength ◽

Precast Concrete ◽

Ductile Failure ◽

Fiber Reinforced ◽

Hybrid Fiber ◽

Hybrid Fibers ◽

Synthetic Fibers ◽

Toughness Index ◽

Matrix Control

In the field of precast concrete, the utilize of fiber reinforced self-consolidation concrete (SCC) has big potential as it can be supplied directly into the molds without any effort for vibration or compacting. Likewise, depending on the design requirements, it has the potential to supplant conventional steel reinforcement. The using of one type of fiber in producing of SCC has been usual. Fiber reinforced self-consolidation concrete (FSCC) contains two type or more of fiber can improve the mechanical properties and may cause performance synergies. This paper investigates the combination of fibers, often referred to as hybridization, for a cementitious matrix. Control, single, two hybrid fibers were cast using different steel and macro synthetic fibers ratios. Fresh behavior, such as the ability to flow and fill and the tendency to segregate, was evaluated by a special SCC test based on its specifications. Moreover, compressive strength, splitting tensile strength, flexural strength, ductility, toughness, and the load - deflection relationship were determined to assess the hardened behavior. The results showed that the compressive strength of hybrid fiber mixes slightly improved. The increment in splitting and flexural strength for hybrid mixes was (60 and 58) % respectively. Also, these hybrid fiber mixes represent a more ductile failure further, the high toughness index, which reaches to 45% of control mix.

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Studying the behavior of geopolymer concretes under repeated loadings

Journal of Engineering and Applied Science ◽

10.1186/s44147-021-00013-z ◽

2021 ◽

Vol 68 (1) ◽

Author(s):

Osamah M. G. Al-Kerttani ◽

Ammar Mutar

Keyword(s):

Compressive Strength ◽

Flexural Strength ◽

Dynamic Loading ◽

Brittle Material ◽

Volume Content ◽

Polypropylene Fiber ◽

Statistical Test ◽

Geopolymer Concrete ◽

Fiber Reinforced ◽

Fiber Volume

AbstractThis article investigates utilization of polypropylene microfibers as reinforcement in geopolymer concrete to enhance the ductility characteristics since the geopolymer concrete is considered a brittle material. The polypropylene microfibers were added to geopolymer concrete at the fiber volume content of 0.5%, 1.0%, and 1.5%. In this article, a slump test and compressive strength were tested for geopolymer concretes to measure the effect of polypropylene microfibers on geopolymer concretes. Also, static flexural strength and dynamic loading were applied to find out the attitude of polypropylene fiber-reinforced geopolymer concrete and to measure both the deflection and number of load cycles until failure. While comparing the results with reference geopolymer concrete, all samples were tested at 28 days and, finally, a statistical test was carried out. The results concluded that the use of polypropylene microfibers improves the compressive strength and enhances the properties of polypropylene fiber-reinforced geopolymer concretes, increases the loading for the appearance of the first crack, and decreases the deflection of polypropylene fiber-reinforced geopolymer concretes compared with reference geopolymer concrete.

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