Evaluation of the mechanical properties of self compacting concrete using current estimating models

A scientific and concise mix design method is an impending problem in the engineering application of self-compacting steel-fiber-reinforced concrete (SFRC). This paper focuses on the mix proportion of self-compacting SFRC, which is influenced by the steel fibers, along with its effects on the packing properties of the steel fiber aggregate skeleton. In total, 252 groups of packing tests were carried out for several main factors, including with various maximum particle sizes for the coarse aggregates, manufactured sand ratios ranging from 50% to 62%, and with different types of hooked-end steel fibers and crimped steel fibers, with volume fractions ranging from 0% to 2.0%. The results indicated that the void content and rational sand ratio of the steel fiber aggregate skeleton increased linearly with the fiber factor. These results provided a basis for the calculation of the binder content and rational sand ratio of the self-compacting SFRC. Combined with the absolute volume design method and the calculation formula for the water-to-binder ratio, a systematical procedure was proposed for the mix proportion design of the self-compacting SFRC. Based on the design method, eight groups of mixtures were cast and tested to verify the adaptability and practicability of the workability, air content, density, cubic compressive strength, and splitting tensile strength of the self-compacting SFRC. Meanwhile, the outcomes of this study confirmed the applicability of using manufactured sand as a complete replacement for natural sand for the self-compacting SFRC.

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“…Based on the above research and previous studies [3,35,36,40], the mix design procedure for self-compacting SFRC is summarized as follows:…”

Section: Design Procedures For MIX Proportion Of Self-compacting Sfrcmentioning

confidence: 99%

“…(2) By fixing the designed cubic compressive strength fcu,0 and the designed tensile strength fft,0, the volume fraction of steel fiber vf can be calculated by Equations (12) [3,35,36] and (13) [40]: 5. The deterministic process for optimal sand ratios for HFb-16.…”

Section: Design Procedures For MIX Proportion Of Self-compacting Sfrcmentioning

confidence: 99%

Mix Proportion Design of Self-Compacting SFRC with Manufactured Sand Based on the Steel Fiber Aggregate Skeleton Packing Test

Ding

Zhao

et al. 2020

Materials

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“…The calculation model of designed tensile strength f ft for SC-SFRC is shown as Equation (6) [60]. fnormalfnormalt=ft(1+αnormaltnormalbαnormaltnormaleλf) where f t is the tensile strength of referenced SCC, which could be accurately estimated by using the EC-2 model [67,68,69]; α te is the coefficient related to the effective fiber distribution; and α tb is a coefficient that colligated the other factors, which influence the bridging effects of steel fibers in the splitting tensile test.…”

Section: Designed Tensile Strength Of Sc-sfrcmentioning

confidence: 99%

Statistical Analysis and Preliminary Study on the Mix Proportion Design of Self-Compacting Steel Fiber Reinforced Concrete

et al. 2019

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With the sustainable development of green construction materials in civil engineering, self-compacting steel fiber reinforced concrete (SC-SFRC) has attracted widespread attention due to its superior self-compacting performance and excellent hardened properties. In this paper, 301 groups of test data from published literatures were collected to quantify the characteristics of the mix proportion of SC-SFRC. The type, aspect ratio and volume fraction of steel fiber commonly used in SC-SFRC are discussed and the effects of steel fiber on the workability and mechanical properties of SC-SFRC are statistically studied. The relationship of cubic compressive strength and water-to-binder ratio and that of the splitting tensile strengths between SC-SFRC and referenced self-compacting concrete (SCC) are also evaluated. Based on these analyses, the reasonable ranges of material components in the mix proportion design of SC-SFRC are determined. The results showed that with several adjusted parameters, the calculation model of the water-to-binder ratio for the mix proportion design of ordinary concrete is suitable for SC-SFRC. The calculation model of tensile strength is suggested for SC-SFRC with various types of steel fiber.

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“…Demir and Korkmaz used fuzzy logic considering compressive strength to estimate elasticity modulus, then determined upper and lower limits of elasticity modulus [15]. Vilanova et al examined elasticity modulus equations proposed by standards and used compressive strengths given in literature [12]. They found that ACI 318-08 overestimated the measured elasticity modulus.…”

Section: Introductionmentioning

confidence: 99%

A comparative analysis of elasticity modulus of recycled aggregate concrete with silica fume

Çakır¹,

Dilbas²

2018

Pamukkale J Eng Sci

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Recycling of waste materials has significant influence on the concept of sustainability in construction industry due to the conservation of natural resources and minimizing the environmental impacts which leads to habitable future. Construction activities, in general, result in huge amount of construction and demolition waste (C&DW) and C&DW has a great potential for possible disposal as recycled aggregate (RA) in civil engineering applications, especially in recycled aggregate concrete (RAC), after recycling processes. In this concept, concrete mixtures including RA and silica fume (SF) at various ratios (0-30-40-70-100%) and (0-5-10%), respectively, are produced in order to determine the elasticity modulus of RAC. This work aims to examine elasticity modulus of RAC determined according to the formulas of standards and studies. Analytical and statistical assessments are performed and experimental and theoretical results are compared. When RA content increases, the elasticity modulus decreases. SF utilization in RAC improves the mechanical parameters (elasticity modulus and compressive strength). The American standard (ACI 318-05) predicts the elasticity modulus approximately to the experimental results although it has the highest relative standard deviations in comparison to the regarded standards. Moreover, proposed equations for RAC by researchers estimate the elasticity modulus values greater than those of standards and the experimental results. An elasticity modulus equation is also proposed for RAC with and without SF.

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Evaluation of the mechanical properties of self compacting concrete using current estimating models

Cited by 27 publications

References 1 publication

Mix Proportion Design of Self-Compacting SFRC with Manufactured Sand Based on the Steel Fiber Aggregate Skeleton Packing Test

Mix Proportion Design of Self-Compacting SFRC with Manufactured Sand Based on the Steel Fiber Aggregate Skeleton Packing Test

Statistical Analysis and Preliminary Study on the Mix Proportion Design of Self-Compacting Steel Fiber Reinforced Concrete

A comparative analysis of elasticity modulus of recycled aggregate concrete with silica fume

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