RETRACTED: Comparative study on effects of Class F fly ash, nano silica and silica fume on properties of high performance self compacting concrete

Jalal, Mostafa; Pouladkhan, Alireza; Harandi, Omid F.; Jafari, Davoud

doi:10.1016/j.conbuildmat.2015.07.001

Cited by 366 publications

(151 citation statements)

References 38 publications

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“…However, due to the lack of sufficient data on the properties of concretes/mortar containing FA, only a little of this amount about 5% is used in construction. Hence, reusing such industrial wastes as mineral admixtures is a solution for reducing the cost of SCC. FA and SF are the by‐products of the coal industry and the silicon‐ferrosilicon industries and contain partially active silica and alumina .…”

Section: Introductionmentioning

confidence: 99%

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Benli

2019

Structural Concrete

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In this paper, the results of experimental work on the strength and durability performances of self‐compacting mortars (SCMs) manufactured from silica fume (SF) and fly ash (FA) were presented. The cement was partially replaced with 5, 10, 15, 20, and 25% of FA and 5, 10, and 15% of SF as binary mixes. Also, ternary mixtures were prepared by the incorporation of FA and SF at different replacement dosages by weight. In total, 14 different combinations of mixes were studied at the ages of 7, 28, and 180 days. Prismatic samples of size 40 × 40 × 160 mm3 were produced and exposed to water curing to observe mechanical behavior of SCMs. The mechanical properties of SCMs were examined by the tests of compressive strength and flexural strength. Sorptivity, porosity, water absorption, and density were also measured. To evaluate fresh properties of SCMs, mini slump flow diameter and mini V‐funnel flow time tests were conducted. The results of the study reveal that increase in the dosage of FA increases SCMs flow but also reduce segregation resistance. The enhancement in flexural strength is the best in the binary mixes of SF10 and in binary mixes of FA. Ten percent replacement of FA shows the best flexural strength performance with a value of 10.21 MPa at the age of 180 days. Compressive and flexural strengths of mortars containing SF and FA reached up to about 86.14 and 10.50 MPa, respectively.

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Section: Introductionmentioning

confidence: 99%

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Benli

2019

Structural Concrete

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“…Groundwater chloride concentrations are often very high, which can have serious impacts on the structure of the project. Many experts have studied the effects of erosion on concrete [11][12][13][14][15][16]. Anitha et al [17] studied the effect of corrosion inhibitors with ecological additives on the corrosion of reinforced concrete.…”

Section: Introductionmentioning

confidence: 99%

Time Effect of Chloride Erosion on Physical and Mechanical Properties of High‐Water‐Content Materials

Liu

Zhang

et al. 2020

Advances in Materials Science and Engineering

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In order to study the characteristics of high water-content materials (HWC) undergoing chloride erosion, we analyzed and summarized changes in strength, elastic modulus, and mass of HWC materials during chloride erosion using specific experimental research, and we also described the compression failure morphologies of HWC materials after erosion. e cuboid specimens developed a horizontal crack between the top and bottom, and the cylindrical specimens developed irregular encryption cracks at the top during increasing pressure. e erosion of HWC materials exposed to calcium chloride (CaCl 2 ) solutions was relatively serious, and the erosion of the cuboid specimens was lower than that of the cylindrical specimens. e strength of HWC materials increased during prolonged erosion, and the strength of the cylindrical specimens in water was the highest, followed by the CaCl 2 and sodium chloride (NaCl) solutions. However, the strength change of the cuboid specimens after 28 d was contrary to the above order. In late erosion stages, the HWC materials had better compactness and experienced smaller compressive deformation in water than the other two solutions. In the NaCl solution, the high-water filling material had more pores and a larger deformation than the other solutions.

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“…A large amount of fly ash and silica is being used as source material in the concrete production industry [4]. Silica fume and fly ash have been used as a partial cement replacement in mortar and concrete production [5][6][7][8]. Fly ash has been suggested to improve rheological properties and reduce the cracking of concrete due to its lower heat of hydration.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Industrial Waste in Cement in a Marine Environment with a Tropical Climate

Chu

Zheng

Chen

et al. 2019

JMSE

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This novel study on cement paste material was conducted with the aim of keeping up with the rapid development of urban construction and contributing to the continuous improvement of building materials to overcome environmental issues. In this study, several kinds of industrial waste were used to enhance the properties of cement paste for application in a marine environment with a tropical climate, such as in Vietnam. This study focuses on evaluating the properties of cement paste containing cement replacement combining 0-30% fly ash, 0-10% silica fume, and plasticizer accounting for 0.3% and 0.4% of the binder by mass. Water demand, chloride ion and sulfate ion permeability, and microstructural properties of the cement paste were determined by thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscope (SEM) and they were investigated after 28 and 56 days. The test results show that an optimum mixture could be obtained with the use of 20% fly ash, 10% silica fume (replacing Portland cement), and 0.4% plasticizer. The application of such materials to sea dikes affected by a tropical climate (characterized by heat, humidity, salty seawater, many big storms, large waves, and strong tides) was investigated for four years on the Vietnamese coast. The test results indicate that fly ash and silica fume can improve the corrosion and abrasion resistance of concrete in coastal areas with a tropical climate, such as in Vietnam.

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RETRACTED: Comparative study on effects of Class F fly ash, nano silica and silica fume on properties of high performance self compacting concrete

Cited by 366 publications

References 38 publications

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Time Effect of Chloride Erosion on Physical and Mechanical Properties of High‐Water‐Content Materials

Utilization of Industrial Waste in Cement in a Marine Environment with a Tropical Climate

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