Fracture energy of natural fibre reinforced concrete

Merta, Ildikó; Tschegg, E. K.

doi:10.1016/j.conbuildmat.2012.11.060

Cited by 173 publications

(74 citation statements)

References 22 publications

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“…The specimens used in this method are fairly compact requiring small amounts of material as compared with the notched beams employed in three-point bending tests. However, the implementation of this test type requires a more sophisticated fixture than that implied by the three-point bending test so that the number of results available in the literature from WS tests for concrete is scarce (Cifuentes and Karihaloo 2013;Korte et al 2014;Merta and Tschegg 2013;Veselý et al 2011). The fracture behavior is analyzed by wedging out the starter notch.…”

Section: )mentioning

confidence: 99%

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Cifuentes

Lozano

Holušová

et al. 2017

Int J Concr Struct Mater

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A new approach for measuring the specific fracture energy of concrete denoted modified disk-shaped compact tension (MDCT) test is presented. The procedure is based on previous ideas regarding the use of compact tension specimens for studying the fracture behavior of concrete but implies significant modifications of the specimen morphology in order to avoid premature failures (such as the breakage of concrete around the pulling load holes). The manufacturing and test performance is improved and simplified, enhancing the reliability of the material characterization. MDCT specimens are particularly suitable when fracture properties of already casted concrete structures are required. To evaluate the applicability of the MDCT test to estimate the size-independent specific fracture energy of concrete (G F ), the interaction between the fracture process zone of concrete and the boundary of the MDCTspecimens at the end of the test is properly analyzed. Further, the experimental results of G F obtained by MDCT tests for normal-and high-strength selfcompacting concrete mixes are compared with those obtained using the well-established three-point bending test. The procedure proposed furnishes promising results, and the G F values obtained are reliable enough for the specimen size range studied in this work.

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Section: )mentioning

confidence: 99%

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Cifuentes

Lozano

Holušová

et al. 2017

Int J Concr Struct Mater

View full text Add to dashboard Cite

show abstract

“…The shape of the curve provides a good indication of the behavior of NFRC after the peak load is reached, with the fibers allowing the concrete component to stay intact for a large CMOD. Unloading tends to occur more slowly as a result of fiber bridging, providing enhanced ductility and crack resistance (Merta and Tschegg, 2013). In comparison, the unloading of plain concrete would end more abruptly at a smaller CMOD due to its brittle nature.…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…For example, the fracture toughness, tensile strength, flexural strength, fatigue, and impact resistance are all seen to be improved (Mehta and Monteiro, 2006). Additionally, adding fibers to a concrete matrix has been long recognized as a way to enhance the energy absorption capacity and crack resistance of regular concrete (Merta and Tschegg, 2013). Natural fibers have also been reported to improve concrete insulation properties by a reduction in its thermal conductivity by 25-35% (Awwad et al, 2012), enabling for a potential reduction in a building's heat consumption.…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties of Treated Natural Hemp Fiber-Reinforced Concrete

Zhou

Saini

Kastiukas

2017

Front. Built Environ.

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In recent years, the construction industry has seen a significant rise in the use of natural fibers, for producing building materials. Research has shown that treated hemp fiberreinforced concrete (THFRC) can provide a low-cost building material for residential and low-rise buildings, while achieving sustainable construction and meeting future environmental targets. This study involved enhancing the mechanical properties of hemp fiber-reinforced concrete through the Ca(OH) 2 solution pretreatment of fibers. Both untreated (UHFRC) and treated (THFRC) hemp fiber-reinforced concrete were tested containing 15-mm length fiber, at a volume fraction of 1%. From the mechanical strength tests, it was observed that the 28-day tensile and compressive strength of THFRC was 16.9 and 10% higher, respectively, than UHFRC. Based on the critical stress intensity factor (K s IC ) and critical strain energy release rate (G s IC ), the fracture toughness of THFRC at 28 days was also found to be 7-13% higher than UHFRC. Additionally, based on the determined brittleness number (Q) and modulus of elasticity, the THFRC was found to be 11% less brittle and 10.8% more ductile. Furthermore, qualitative analysis supported many of the mechanical strength findings through favorable surface roughness observed on treated fibers and resistance to fiber pull-out.

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“…Merta and Tschegg [30] studied the potentials usage of outer core of the Pennisetum Purpureum stem as fibres reinforcement for concrete. The study shows that Pennisetum Purpureum fibres had tensile strength of about 40 to 60 MPa, which has similar range to wheat straw fibres strength.…”

Section: Pennisetum Purpureummentioning

confidence: 99%

Compressive Strength of Construction Materials Containing Agricultural Crop Wastes: A Review

Ibrahim

Ghani

et al. 2017

MATEC Web Conf.

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Abstract. The growth of industrialization and development of urban life made an increase in demand for cement, concrete and bricks. Exploitation on the non-renewable natural resources for raw materials will keep increased in order to meet the demands for construction materials. At the same time, the problems regarding the agricultural crop wastes such as rice husk, sugarcane bagasse, palm oil fuel waste and elephant grass has become an important issue nowadays. Consequently, there are many researchers who have been studying the viability of using these agricultural wastes as construction materials to meet the industry demands in order to decrease the current use of non-renewable natural resources. This paper reviewing on how agricultural waste could be utilized as replacement materials for construction activities from various researchers. The idea of using agricultural crop wastes was promoted by studying upon their engineering properties. This paper focusing on the compressive strength of the construction materials containing agricultural crop wastes, which was the common parameter considered by most researcher as required by various standards.

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Fracture energy of natural fibre reinforced concrete

Cited by 173 publications

References 22 publications

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Engineering Properties of Treated Natural Hemp Fiber-Reinforced Concrete

Compressive Strength of Construction Materials Containing Agricultural Crop Wastes: A Review

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