scholarly journals Lightweight SFRC Benefitting from a Pre-Soaking and Internal Curing Process

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4152 ◽  
Author(s):  
Marie Hornakova ◽  
Jacek Katzer ◽  
Janusz Kobaka ◽  
Petr Konecny
Keyword(s):  
Strength Class ◽  
Coarse Aggregate ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Internal Curing ◽  
Fine Aggregate ◽  
Coated Steel ◽  
Curing Process ◽  
Model Code ◽  
Concrete Mix

The presented research program is focused on the design of a structural lightweight fiber-reinforced concrete harnessing an internal curing process. Pre-soaked waste red ceramic fine aggregate and pre-soaked artificial clay expanded coarse aggregate were utilized for the creation of the mix. Copper-coated steel fiber was added to the mix by volume in amounts of 0.0%, 0.5%, 1.0%, and 1.5%. Test specimens in forms of cubes, cylinders, and beams were tested to specify the concrete characteristics. Such properties as consistency, compressive strength, splitting tensile strength, static and dynamic modulus of elasticity, flexural characteristics, and shear strength were of special interest. The achieved concrete can be classified as LC12/13. A strength class, according to fib Model Code, was also assigned to the concretes in question. The proposed method of preparation of concrete mix using only pre-soaked aggregate (with no extra water) proved to be feasible.

Penetration Resistance Research of Fiber Reinforced RPC

2014 ◽  
Vol 1055 ◽  
pp. 23-26
Author(s):  
Can Xu
Keyword(s):  
Reinforced Concrete ◽  
Coarse Aggregate ◽  
Steel Fiber ◽  
Penetration Resistance ◽  
Fiber Content ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Quartz Powder ◽  
Steel Fiber Reinforced Concrete

In the original to remove steel and steel fiber reinforced concrete coarse aggregate in quartz powder and a small amount of activator, can boost steel fiber content, and its application in construction makes it more convenient, but how the penetration resistance works is not particularly clear. Through the penetration resistance experiment, found that when joined the SF and BF, RPC can still keep complete even after three times by penetration ,indicating the good performance of penetration resistance.

scholarly journals Steel fiber bond strength to estimate fRi parameters

2021 ◽  
Author(s):  
Aaron Kadima ◽  
Jeandry Bule Ntuku ◽  
Dênio Ramam Carvalho de Oliveira
Keyword(s):  
Bond Strength ◽  
Steel Fiber ◽  
Mouth Opening ◽  
Fiber Reinforced Concrete ◽  
Crack Mouth Opening Displacement ◽  
Steel Fiber Reinforced Concrete ◽  
Fiber Volume ◽  
Opening Displacement ◽  
Fiber Aspect Ratio ◽  
Model Code

This paper presents the results of the safety assessment of the β_1 coefficient that correlates the residual flexural tensile strength parameters fRi (i = 1, 2, 3, and 4) in steel fiber reinforced concrete (SFRC), collected through experimental notched beam flexural tests in three points, according to the fib Model Code 2010 (fib, 2013), with the bond strength (fu,f) of the hook-end type steel fiber in the concrete mix. The SFRC beams were chosen, which presents the load-opening ratio curve of the crack, F-CMOD (Crack Mouth Opening Displacement) in softening behavior, the compressive strength of the concrete, 25 MPa < fc < 80 MPa, the fiber volume content, 0.25 % < Vf < 0.80 % and the fiber aspect ratio, 60 < lf/df < 95. The results in 46 prisms notched of the database formed by 13 studies, showed a considerable influence of the fRi x fu,f ratio with lower variability of around 10%. Thus, through statistical resources, empirical proposals were established to estimate the residual flexural tensile strengths, as a viable and economical alternative to the design project.

scholarly journals Strength Characteristics of Slag Based Steel Fiber Reinforced Concrete with Partial Replacement of Steel Slag in Coarse Aggregate

2019 ◽  
Vol 8 (3) ◽  
pp. 3449-3452 ◽  
Keyword(s):  
Coarse Aggregate ◽  
Steel Fiber ◽  
Flexural Rigidity ◽  
Research Work ◽  
Steel Slag ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Partial Replacement ◽  
Experimental Program ◽  
Stone Dust

The current research work represents the various test results from an experimental program for the influence of mineral admixture, stone dust, steel slags and rapid hardening (accelerator) type of chemical admixtures along with the inclusion of steel fibers for various mixture proportions on the mechanical properties of concrete. The different strength properties considered the cubical size for compressive strength, prism for flexural rigidity and monitored the ultrasonic pulse velocity test including water absorption (sorptivity) test for different curing days was evaluated. The outcome results for concrete shows that when the percentage of steel slag is increased then there will be a good workability in fresh concrete than normal aggregates. In overall 100% of stone dust, if the portion of steel slag is more than 40% with replacement of coarse aggregate and binding material as slag will lead to minimum workability, there is no change in the proceding workability area in the further addition of super plasticizer. Also, the study indicates that the crimped steel fiber matrix interaction gives considerable results to enhance the bending stress in flexural rigidity caused by the introducing of steel fibers.

scholarly journals INVESTIGATION OF MECHANICAL PROPERTIES OF PAVER BLOCK MADE WITH EVA POLYMERS AND FLY ASH

2021 ◽  
Vol 9 (02) ◽  
pp. 694-702
Author(s):  
K. Hariharan ◽  
◽  
A. Krishna Moorthy ◽  
Keyword(s):  
Fly Ash ◽  
Coarse Aggregate ◽  
Block Design ◽  
Mix Design ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Curing Process ◽  
Cement Concrete ◽  
Ethyl Vinyl ◽  
Water Absorption Test

The aim of the project is to replace cement with fly ash and course aggregate with Ethyl Vinyl Acetate (EVA) in paver block. In this thesis paver block design is by using cement concrete mixture of mix design M30 which is composed of 10mm coarse aggregate cement and fine aggregate (M-sand).In this thesis the cement is partially replaced with fly ash and partial replacement of EVA with coarse aggregate in paver block at various level of 5, 10, 15, and 20 percentage of its weight. The paver block curing process is done for 7days and 28days. After curing it is checked for its compression strength, water absorption test and densitytest.

scholarly journals Utilization of PET Fiber in Concrete

2019 ◽  
pp. 204-212
Keyword(s):  
Flexural Strength ◽  
Fiber Reinforced Concrete ◽  
Fine Aggregate ◽  
Fiber Volume ◽  
Split Tensile Strength ◽  
Pet Bottles ◽  
Curing Period ◽  
Daunting Task ◽  
Concrete Mix ◽  
Pet Fibers

In this study, the effectiveness of waste Polyethylene Terephthalate (PET) fibers in improving the properties of concrete was investigated. Recycling of waste PET bottles is a daunting task in developing countries due to inadequate recycling facilities. The main aim of this research paper is to investigate the mechanical behavior of the components by using PET fibers. This paper describes the performance of PET fiber reinforced concrete for two grades of concrete mix M20 and M30. An experimental work has been carried out on the specimens like cubes, cylinders and beams which were casted in the laboratory and their behavior under the test was observed. The PET fibers were replaced to the fine aggregate volume from 0.0% to 2.0%. The compressive strength, split tensile strength and flexural strength of concrete were determined after 28 days of curing period. The highest compressive, split tensile and flexural strength of concrete was observed at 1.5% fiber volume replacement to the fine aggregate. The study concludes that the replacement of waste PET fibers to fine aggregate in concrete serves as a means of utilizing the waste generated by PET bottles to increase the strength of concrete.

scholarly journals Optimization of the Fine to Coarse Aggregate Ratio for the Workability and Mechanical Properties of High Strength Steel Fiber Reinforced Concretes

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5202
Author(s):  
Mohammad Iqbal Khan ◽  
Wasim Abbass ◽  
Mohammad Alrubaidi ◽  
Fahad K. Alqahtani
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Flexural Strength ◽  
Coarse Aggregate ◽  
Steel Fiber ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Fresh State

High-strength concrete is used to provide quality control for concrete structures, yet it has the drawback of brittleness. The inclusion of fibers improves the ductility of concrete but negatively affects the fresh properties of fiber-reinforced concrete. The effects of different fine to coarse aggregate ratios on the fresh and hardened properties of steel fiber reinforced concrete were investigated in this study. Mixtures were prepared with various fine to coarse aggregate (FA/CA) ratios incorporating 1% steel fiber content (by volume) at constant water to cement ratio. The workability, unit weight, and temperature of the concrete in the fresh state, and the mechanical properties of steel-fiber-reinforced concrete (SFRC) were investigated. The inclusion of fiber in concrete influenced the mobility of concrete in the fresh state by acting as a barrier to the movement of coarse aggregate. It was observed that the concrete with an FA/CA ratio above 0.8 showed better flowability in the fresh state, whilst an above 0.9 FA/CA ratio requires excessive superplasticizer to maintain the flowability of the mixtures. The compressive and flexural strength of SFRC increased with an increase in the FA/CA ratio by around 10% and 28%, respectively. Experimental values of compressive strength and flexural strength showed good agreement, however, modulus of elasticity demonstrated slightly higher values. The experimentally obtained measurements of the mechanical properties of SFRC conformed reasonably well with the available existing prediction equations, and further enabled establishing predictive isoresponse interactive equations within the scope of the investigation domain.

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