Mechanical behavior of sustainable hybrid-synthetic fiber reinforced cellular light weight concrete for structural applications of masonry

Int J Concr Struct Mater

2016

Fire ranks high among the potential risks faced by most buildings and structures. A full understanding of temperature effects on fiber reinforced concrete is still lacking. This investigation focuses on the study of the residual compressive strength, stress strain behavior and surface cracking of structural polypropylene fiber-reinforced concrete subjected to temperatures up to 300°C. A total of 48 cubes was cast with different fiber dosages and tested under compression after exposing to different temperatures. Concrete cubes with varying macro (structural) fiber dosages were exposed to different temperatures and tested to observe the stress-strain behavior. Digital image correlation, an advanced non-contacting method was used for measuring the strain. Trends in the relative residual strengths with respect to different fiber dosages indicate an improvement up to 15 % in the ultimate compressive strengths at all exposure temperatures. The stress-strain curves show an improvement in post peak behavior with increasing fiber dosage at all exposure temperatures considered in this study.

Section: Residual Compressive Stress-strain Behaviourmentioning

confidence: 93%

A Study on Residual Compression Behavior of Structural Fiber Reinforced Concrete Exposed to Moderate Temperature Using Digital Image Correlation

Srikar

Anand

Int J Concr Struct Mater

2016

“…Therefore, the unit of TTI and CTI will be those of energy per unit volume that is N-mm per cubic millimeter which turns out to be MPa. Complete details of uniaxial compression and tension tests and results can be found elsewhere [8], [10]. [39] and JCI [40] standards has given test procedures for determination of fracture parameters of concrete.…”

Section: Siliceous Fly Ash Of Class F Is Used and Its Basic Chemical mentioning

confidence: 99%

“…Fiber reinforced CLC (FRCLC) is one such special concrete which has enhanced toughness, better composite behavior, durability and impact resistance compared to their unreinforced counterpart [6], [7]. Improvement of mechanical properties of high performance concrete by addition of synthetic fiber reinforcement has been confirmed by many researchers [8]- [12]. Although steel fibers have superior mechanical properties compared to that of synthetic fibers, they decrease the workability and creates a balling effect at higher dosage.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, structural synthetic fibers, being non-corrosive and malleable, have gained attention in the recent years. They are also used for reinforcing cementitious materials to control the crack propagation and improve the overall structural performance [8], [9]. Synthetic plastic fibers used in this study are not green and a sustainable mateiral.…”

Section: Introductionmentioning

confidence: 99%

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Fracture studies on synthetic fiber reinforced cellular concrete using acoustic emission technique

Rasheed

Construction and Building Materials

Raju

et al. 2018

Self Cite

Cellular lightweight concrete (CLC) is increasingly used for low strength non-structural and structural applications. The effects of synthetic fiber reinforcement on the fracture behavior of CLC is investigated. In particular, acoustic emission (AE) technique is employed to study the influence of macro (structural), micro polyolefin synthetic fibers and their combinations on the fracture behavior of CLC beams. Notched fiber reinforced CLC beams were tested to study the crack initiation and propagation characteristics using AE sensors. Different AE parameters are correlated with the crack growth and damage accumulation. An attempt has been made to correlate the crack mouth opening displacement (CMOD) with the number of AE hits. The variation of cumulative acoustic energy release of the cracks is studied with respect to applied load and CMOD. Three dimensional source location of cracks is carried out based on the AE events picked by the sensors bonded to the CLC specimens. The analysis of AE results indicates that the crack source location identification from AE is consistent with the actual crack development. Analysis of AE signals reveal that the CLC matrix cracking produces signals with less number of hits that lie in the notched plane in bending. Moreover, the signals from the post peak regime correspond to more number of hits which tend to be scattered around the plane of notch due to the fiber pull out.

“…Fiber Reinforced Concrete (FRC) is tailored by addition of randomly oriented fibers to plain concrete. FRC has gained popularity in the recent years due to advantages like (i) ease of availability of fibers; (ii) better performance in serviceability regime; and (iii) improved mechanical properties in compression, tension, flexure, and shear when compared to the conventional concrete [1][2][3][4][5]. Apart from crack resistance, steel fibers can also be used to replace the conventional transverse reinforcement in the concrete [6,7].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of steel and macro-synthetic structural fibers on the flexure-shear behaviour of prestressed concrete beams

Joshi

Thammishetti

2018

Engineering Structures

The efficiency of steel and structural synthetic fibers on the performance improvement of prestressed concrete (PSC) beams under combined flexure-shear is studied. Results of eleven PSC beams tested at a shear span (a) to depth (d) ratio of five are presented. Discrete steel and macro synthetic structural polyolefin fibers of varying dosages of 0.35%, 0.7% and 1.0% by volume of concrete were used. The effect of fiber addition on overall loaddisplacement, loadstrain, and strain energy absorption capacity of PSC beams is analysed. Other parameters such as shear span to depth ratio (a/d), compressive strength of concrete, prestressing reinforcement ratio were kept constant. The test results portray that the addition of steel fibers stiffens the post cracking response, increases the strain energy absorption capacity more efficiently when compared to macro synthetic fibers (Polyolefin). The failure mode changed from less ductile flexure-shear to more ductile flexure dominant mode at 0.35% and 0.70% volumetric dosage of steel and synthetic fibers, respectively. The strain energy absorption capacity increased by more than 100% at 1.0% fiber addition for both steel and macro-synthetic fibers.