Statistical and Practical Evaluation of the Mechanical and Fracture Properties of Steel Fibre Reinforced Concrete

Abstract

The sustainability of the construction industry requires new perspectives on existing techniques. For example, fibre concrete has been an integral part of the construction industry for many years and its contribution to enhancing the properties and use of concrete is undeniable, but there are still some questions that need to be answered. The present paper showed the possibilities of statistical evaluation of crack mouth displacement (CMOD) tests performed on 24 fibre concrete specimens. The aim was to point out possible pitfalls and to propose measures based on statistics. The geometrical properties of all samples were determined and correlated with the results of the CMOD test. In this paper, a procedure was considered to compare two different concretes with different fibres at CMOD level. Correlations between geometry and CMOD test results were also demonstrated.

Practical Aspects of Correlation Analysis of Compressive Strength from Destructive and Non-Destructive Methods in Different Directions

“…For example, a PCC greater than 0.5 means strong strength. The same set was then analyzed using linear regression [30] and the determinant R 2 [31,32]. R 2 is a statistic used in the context of statistical models whose main purpose is to predict future outcomes.…”

Experimental Investigation of the Effect of Steel Fibers on the Flexural Behavior of Corroded Prestressed Reinforced Concrete Beams

“…Hybrid steel–FRP-reinforced concrete (HSFRC) beam exhibits ductile failure, and the bearing capacity of the beam continues to increase after yielding [ 27 ]. Although the incorporation of steel fiber may result in reduced workability of fresh steel fiber reinforced concrete (SFRC) and in some cases, result in inadequate flowability if the fiber content exceeds a certain threshold [ 28 ], it significantly enhances the strength and toughness of the hardened SFRC [ 29 ]. Additionally, fibers are used to limit the crack width, which positively affects concrete durability.…”

Performance Study of Lightweight Insulating Mortar Reinforced with Straw Fiber

“…The data showed that the synthetic fibers had high resistance to crack expansion at early stages; the residual tensile strength was significantly higher in the case of co-blended macro- and micropolypropylene fibers. Petr Lehner [ 6 ] found better shear performance for longer fibers when performing crack opening displacement tests on fibrous concrete specimens. Yewei Jiang [ 7 ] determined the optimal combination of insulation material doped with basalt fibers by orthogonal tests and data analysis, i.e., 45% doped basalt fibers with 6 mm basalt fiber length and 20% doped ceramic particles.…”

“…Tiezhi Zhang [ 18 ] found, using SEM micrographs, that jute fibers are able to hinder the propagation and connection of existing cracks as well as withstand some of the tensile stresses during loading, resulting in reinforcement, toughening and crack resistance. Straw bales have undeniable advantages in terms of low environmental loads, low energy consumption for production and favorable thermal engineering properties as part of the main load-bearing member or load-bearing structure [ 6 ]. Hanifi Binici [ 12 ] added different masses of sunflower and wheat straw to a mixture of gypsum and vermiculite to make compressed insulation.…”