Absorption and Strength Properties of Short Carbon Fiber Reinforced Mortar Composite

Abdel‐Sayed, George; Hearn, Nataliya

doi:10.3390/buildings11070300

Cited by 24 publications

(15 citation statements)

References 27 publications

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“…At the age of 28 days, the mechanical bond strength improvement results from the presence of fiber which permits to delay formation of the micro-cracks and arrest the propagation of the micro-cracks which leads to the enhancement of the compressive strength. Moreover, compressive strength mainly based on the mortar workability, degree of the cube compaction, and density [34]. The same results were obtained by [35] for the compressive strength which decreased with more than 3% CFF content.…”

Section: Figure 6 Relation Between Time and Compressive Load For Mortar Cubes At 28 Days Of Curing Agesupporting

confidence: 71%

Performance of Carbon Fiber Filament Reinforcing Cement Mortar

Salama

Edris

2021

Civ Eng J

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This paper aims to study the effect of Carbon Fiber Filament (CFF) with different ratios and lengths on the physical and mechanical properties of cement mortar. An experimental program included 3 cm fixed length of CFF with 0, 0.25, 0.5, 0.75, and 1% different ratios by weight of cement addition were used in cement mortar cubes. Another experimental program of 0.5% CFF ratio with 1, 2, 3, 4, and 5 cm different lengths by weight of cement addition was used in cement mortar prisms. The physical and mechanical properties of cement mortar containing CFF were experimentally investigated at 7 and 28 days of curing. Workability, by means of flow table test, were measured. Density is conducted for cubes and prisms at the age of 28 days. At ages of 7 and 28 days, compressive and flexural strengths were studied. The study showed a reduction in workability with the increase of CFF ratios and lengths by 0.0 to 2.7% and by 0.9 to 5.4% respectively. Moreover, an improvement in density, compressive, and flexural strengths was observed. At ages of 7 and 28 days, the results showed that compressive strength increased by 33 and 31% respectively at 0.5% of CFF ratio while the flexural strength increased by 125 and 327% respectively with CFF length of 5 cm. Doi: 10.28991/cej-2021-03091753 Full Text: PDF

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Section: Figure 6 Relation Between Time and Compressive Load For Mortar Cubes At 28 Days Of Curing Agesupporting

confidence: 71%

Performance of Carbon Fiber Filament Reinforcing Cement Mortar

Salama

Edris

2021

Civ Eng J

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“…Furthermore, a 27.6% increase in the first-crack flexural strength and a 70.7% rise in the ultimate flexural strength were observed for MCCF3 at the age of 28 days. Such significant increases in the first-crack and ultimate flexural strengths, with the inclusion of carbon fibers, were largely credited to the increased reinforcing and bonding effects of the fibers [ 2 , 31 , 53 ]. Carbon fibers possess extremely high tensile strength (refer to Section 3.1 ).…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…When they are used in cement composites, the presence of silica fume improves their bonding with the surrounding matrix [ 2 ]. In addition, they orient along the length of the beam specimens when vibration is applied for the compaction of cement composites [ 53 ]. This suggests that the carbon fibers were more effective in resisting the tensile stress at the lower portion of the specimens, below their neutral axis, thus resulting in a higher flexural strength.…”

Section: Test Results and Discussionmentioning

confidence: 99%

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Flexural and Impact Behaviors of Mortar Composite Including Carbon Fibers

Abdel‐Sayed

Hearn

2022

Materials

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This study investigated the flexural and impact performances of mortar composite made with carbon fibers (MCCF). Four mortar composites (MCCF1, MCCF2, MCCF3, and MCCF4) were produced, using 1%, 2%, 3%, and 4% carbon fibers by volume, respectively. Another mortar composite without any carbon fibers (MCCF0) was prepared for its use as a control mix. The freshly mixed mortar composites were tested for inverted slump cone flow time to ensure they had an adequate workability to cast test specimens under vibration. In addition, all fresh mortar composites were examined for density and air content. The hardened mortar composites were tested for their first-crack flexural strength, ultimate flexural strength, first-crack impact resistance, and ultimate impact resistance. Moreover, the first-crack flexural toughness, ultimate flexural toughness, first-crack impact toughness, and ultimate impact toughness were determined for all hardened mortar composites. The correlations among the hardened properties of the mortar composites were also sought. Finally, the optimum fiber content was defined from the overall test results and considering the costs of the mortar composites. The test results showed that the workability and density of the fresh mortar composite decreased, whereas its air content increased due to the inclusion of carbon fibers. However, MCCF3 possessed the highest density and lowest air content among all MCCF mixes. It also had a higher workability than MCCF4. In the hardened state, the first-crack flexural strength and impact resistance, as well as the ultimate flexural strength and impact resistance of mortar composite, increased significantly with the increasing volume content of carbon fibers. In addition, the first-crack flexural toughness, ultimate flexural toughness, first-crack impact toughness, and ultimate impact toughness increased greatly with the higher volume content of carbon fibers. Strong correlations between the flexural strength and impact resistance, and between the flexural toughness and impact toughness of the mortar composites, were observed. Above all, excellent flexural strength, flexural toughness, impact resistance, and impact toughness values were observed for MCCF4 (4% carbon fibers). The 28-day ultimate flexural strength and impact resistance of MCCF4 increased by 4.6 MPa and 134 blows, respectively, as compared to MCCF0. Moreover, the 28-day ultimate flexural toughness and ultimate impact toughness values of MCCF4 were higher than that of MCCF0, by 3739.7 N-mm and 2703.3 J, respectively. However, MCCF3 (3% carbon fibers) also exhibited a good performance under flexural and impact loadings. Based on the costs of all mortar composites and their performances in both fresh and hardened states, MCCF3 was derived as the best mortar mix. This implies that 3% carbon fibers can be defined as the optimum fiber content in the context of the present study.

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“…It is clear from the figure that the water absorption decreased with the increase in the fibre content up to 0.15% polypropylene and increased further with the addition of polypropylene fibres [41]. This may be due to the low degree of compaction at a higher level of fibre contents in the mixture [42]. The high fineness of the source materials also reduces the bleeding; therefore, no bleed-water was trapped beneath the coarse aggregate particle, and porosity gets reduced [43].…”

Section: Water Absorptionmentioning

confidence: 90%

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

2021

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The need to develop sustainable concrete in the civil infrastructure industry increases day by day, resulting in new eco-friendly materials such as geopolymer concrete. Geopolymer concrete is one of the eminent alternatives to conventional concrete for sustainable development by reducing the carbon footprint. Ternary blend geopolymer concrete (TGPC) is a sustainable and environmentally friendly concrete produced with three different source materials to form a binder. The main advantage of TGPC is that it possesses densely packed particles of different shapes and sizes, which results in improved properties. This paper deals with the experimental investigations to evaluate the durability properties of plain and hybrid fibre reinforced TGPC. The durability of concrete is defined as the ability to withstand a safe level of serviceability and different environmental exposure conditions without any significant repair and rehabilitation throughout the service life. Conventional concrete is vulnerable to cracking due to its low tensile and durability properties. The TGPC considered in this work consists of fly ash, GGBS and metakaolin as source materials, selected mainly based on the material’s silica and alumina content, shape, size, and availability. The grade of concrete considered was M55. The main variables considered in this study were the proportions of crimped steel fibres (Vf), viz., 0.5% and 1% and proportions of polypropylene fibres (Vp)viz., 0.1%, 0.15%, 0.20% and 0.25%. The durability properties like water absorption, sorptivity, resistance to marine attack, acid attack, sulphate attack, and abrasion were studied in this investigation. The experimental test results were compared with the requirements provided in the standard/literature and found to be well within limits. The study also indicates that the inclusion of fibres in a hybrid form significantly improves the durability parameters of TGPC. The TGPC with 1% steel fibre and 0.15% polypropylene fibre performs better than the other combination of fibres considered in this experimental investigation.

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Absorption and Strength Properties of Short Carbon Fiber Reinforced Mortar Composite

Cited by 24 publications

References 27 publications

Performance of Carbon Fiber Filament Reinforcing Cement Mortar

Performance of Carbon Fiber Filament Reinforcing Cement Mortar

Flexural and Impact Behaviors of Mortar Composite Including Carbon Fibers

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

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