Experimental study on the compressive and flexural behaviour of recycled aggregate concrete modified with silica fume and fibres

Xie, Jianhe; Huang, Liang; Guo, Yong; Z, Li; Fang, Chi; Li, Lijuan; Wang, Junjie

doi:10.1016/j.conbuildmat.2018.05.136

Cited by 129 publications

(50 citation statements)

References 47 publications

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“…It was proven that the addition of 10% of SF in relation to the weight of cement significantly increased the compressive and flexural strength of concrete with 75% recycled aggregate content. Similar conclusions were found by others [Xie et al, 2018], [Pedro et al, 2018].…”

Section: Journal Of Ecological Engineeringsupporting

confidence: 92%

The Influence of Silica Fume on the Mechanical and Thermal Parameters of Portland Cement Concretes

Strzałkowski¹,

Garbalińska²

2019

J. Ecol. Eng.

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The influence of the silica fume (SF) addition on the basic mechanical and thermal parameters of cement concrete was presented in this paper. Numerous studies show that the specific properties of silica fume allow producing concretes with increased strength and durability properties. However, the results of the authors' own studies demonstrated that under specific circumstances, the SF addition can negatively affect the strength of cement concrete. In this paper, the concretes made from two types of coarse aggregate, 4-8 mm fraction: reference ordinary gravel aggregate (Ref) and broken basalt aggregate (Bas) were tested. Comprehensive tests (microstructural, strength and thermal) were carried out on three formulas: the first one (Ref-0) did not contain any additives or admixtures. Silica fume and superplasticizer were used in the second formula (Ref-8), introduced in the amount of 8% and 0.75% of the cement's weight, respectively. The third formula, based on basalt aggregate (Bas-8), also contained silica fume and a superplasticizer, dosed in the same amount as in the second formula. Porosimetric studies showed that the use of silica fume in the Ref-8 formula resulted in a decrease in the number of pores smaller than 0.15 μm in comparison to the Ref-0 reference concrete without the silica fume. On the other hand, numerous additional pores with diameters ranging from 0.05 to 300 μm were found in the Bas-8 concrete. In turn, optical porosimetry proved that the basalt-based concrete had numerous pores in the range above 70 μm, which were not observed in the case of the concretes with ordinary pebble aggregate. In the case of the normal concrete, the addition of silica fume resulted in an increase in the compressive strength. However, the basalt-based concrete, due to its much higher porosity, achieved significantly lower strength values. The results showed that the observed changes in porosity, caused by the presence of silica fume, resulted in lower values of thermal conductivity and specific heat of mature composites that it had been added to. This was particularly evident for the basalt-based concrete.

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Section: Journal Of Ecological Engineeringsupporting

confidence: 92%

The Influence of Silica Fume on the Mechanical and Thermal Parameters of Portland Cement Concretes

Strzałkowski¹,

Garbalińska²

2019

J. Ecol. Eng.

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“…It was reported that increases in strength and durability performance of blended cement was noted [4]. Similar studies were carried out in earlier research for quantifying the performance of blended cement in different conditions [5,6,7,8].…”

Section: Generalsupporting

confidence: 57%

Strength characteristics of Quaternary Mix Concrete

Bhuvaneshwari¹,

Pavaleesh²

2019

IJITEE

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By handling the cement, bagasse ash, silica fume and metakaolin as partial replacement of cement of cement a quaternary mix concrete could be achieved. Various percentages of replaced materials were considered for analysis. These three different materials consist of high amount of alumina ion and silica percentage. Use of these materials enhances the microstructure of concrete and helps to attain less permeable concrete. Physical and chemical properties of materials analyzed, and partially replaced with cement in different proportions such as HSC [5B, 10B, 15B, 20B] and HSC [5S, 10S, 15S, 20S] and HSC [5M, 10M]. The cubes of [100mm x 100mm x 100 mm] size were cast and tested. After confirming the characteristic compressive strength from cubes, optimum values (HSC 10B, HSC 15S and HSC 5M) has been taken. These values have been mixed up into three propositions (QBSM1, QBSM2 and QBSM3). Compressive strength results show that optimum percentage was found to be QBSM2 (10% SCBA+ 10% SF + 5% MK).

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“…RC has been investigated with different types of fiber reinforcements mainly to upgrade the ductility and overall mechanical strength of the material. The most commonly investigated type of fiber reinforcement in RC is steel fiber with and without mineral admixtures [13,14,17,18]. Polypropylene, basalt, and glass fibers have also been investigated in RC [19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…There are fewer studies [13,18,37,40] that have explored the properties of RC utilizing a combination of both fiber reinforcement and mineral admixture. Xie et al [18] described that synergistic use of silica fume and fiber can improve the bond strength and dispersion of steel fiber in the concrete matrix, which results in an upgradation of CS and FS of RC. They found that simultaneous incorporation of 8% silica fume with steel fiber produces RC having CS closer to that of the reference "NC".…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Hardened Properties of Recycled Concrete (RC) through Synergistic Incorporation of Fiber Reinforcement and Silica Fume

Ali

Ahmed

Qureshi³

et al. 2020

Materials

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Portland cement concrete is fragile in tension and it has numerous negative impacts on the environment. To deal with these issues, both fiber reinforcement and recycled materials can be utilized to manufacture sustainable and ductile concrete. In this study, the synergistic effects of high-performance mineral admixture silica fume and glass fiber reinforcement were investigated on the hardened properties of RC. For this purpose, two concrete mix families, namely, NC and RC were prepared. To understand the benefits of synergistic utilization of glass fiber and silica fume, in both NC and RC, 0.5% glass fiber was incorporated with three different levels of silica fume. i.e., 0%, 5%, and 10%. Both strength and permeability-related durability properties were investigated. Results revealed that combined incorporation of 0.5% fiber and 10% silica fume can help in the production of RC having better mechanical and durability performance compared to reference “NC”. Simultaneous incorporation of silica fume and glass fiber produces a combined effect greater than their individual effects on both mechanical and permeability properties of concrete. Silica fume plays a very dominant and positive role in the development of CS, WA, and CIPR of RC, whereas glass fiber plays a vital role in upgrading STS and FS of RC and whereas, with the addition of 0.5% glass fiber, RC can yield 8–9 times higher flexural toughness than that of the plain NC.

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Experimental study on the compressive and flexural behaviour of recycled aggregate concrete modified with silica fume and fibres

Cited by 129 publications

References 47 publications

The Influence of Silica Fume on the Mechanical and Thermal Parameters of Portland Cement Concretes

The Influence of Silica Fume on the Mechanical and Thermal Parameters of Portland Cement Concretes

Strength characteristics of Quaternary Mix Concrete

Enhancing the Hardened Properties of Recycled Concrete (RC) through Synergistic Incorporation of Fiber Reinforcement and Silica Fume

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