Effects of Fly Ash and Bentonite on Mechanical and Durability Properties of Fiber Reinforced Geopolymer

Zhao, Nan; Wang, Sheliang; Quan, Xiaoyi; Liu, Kangning; Xu, Jing; Liu, Bo; Liu, Yang

doi:10.1007/s11837-022-05665-7

Cited by 2 publications

(3 citation statements)

References 40 publications

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“…A large amount of active SiO 2 in SF reacted with coarse CH crystals in the ITZ to reduce the large apertures caused by coarse CH and oriented CH crystals, as shown in formula . In addition, the generated C–S–H gel could fill the micropores near aggregates to further contribute to the reduction in pore size and number in the ITZ . It should also be noted that amorphous SiO 2 reacted with CH to produce C–S–H gel to promote full completion of the cement hydration reaction .…”

Section: Resultsmentioning

confidence: 99%

“…60 In addition, the generated C−S−H gel could fill the micropores near aggregates to further contribute to the reduction in pore size and number in the ITZ. 61 It should also be noted that amorphous SiO 2 reacted with CH to produce C−S−H gel to promote full completion of the cement hydration reaction. 62 The change in porosity in 90P-10S was similar to that in 92.5P-7.5S, except that the porosity in 90P-10S almost no longer decreased when D fa reached 40 μm.…”

Section: Porosity Of the Itzmentioning

confidence: 99%

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Properties and Microstructure of an Interfacial Transition Zone Enhanced by Silica Fume in Concrete Prepared with Coal Gangue as an Aggregate

Wang,

Li,

Zhong

et al. 2023

ACS Omega

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The wide application of concrete prepared with coal gangue (CG) as an aggregate (CPCGA) is limited because of the low mechanical strength and strong water absorption capacity of CG. This paper used silica fume (SF) to improve the performance of the interfacial transition zone (ITZ) in CPCGA and revealed the enhancement mechanism. The results showed that the compressive strength of CPCGA prepared with cement replaced by a suitable amount of SF at the age of 28 days increased by more than 30%, and the flexural strength increased by over 20%. The SF could effectively reduce the porosity and micropore size in the ITZ of CPCGA, and the porosity of the ITZ in CPCGA added with 7.50% SF decreased by 44.22, 46.16, and 24.46% at distances from the aggregate surface of 10, 50, and 100 μm, respectively, compared with CPCGA without SF. Further research showed that Ca(OH)2 (CH) generated in the cement hydration reaction reacted with a large amount of active SiO2 in SF to restrain the formation of coarse CH in the ITZ of CPCGA, and the calcium silicate hydrate (C–S–H) gel generated filled the ITZ micropores to reduce the ITZ porosity further. Moreover, the reaction of SF and CH helped to promote the hydration reaction of cement to proceed thoroughly in CPCGA, thus improving CPCGA performance.

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Section: Resultsmentioning

confidence: 99%

Section: Porosity Of the Itzmentioning

confidence: 99%

Properties and Microstructure of an Interfacial Transition Zone Enhanced by Silica Fume in Concrete Prepared with Coal Gangue as an Aggregate

Wang,

Li,

Zhong

et al. 2023

ACS Omega

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“…In recent years, polyvinyl alcohol fiber (PVA) has attracted a great deal of attention due to its excellent physical and mechanical properties in various cementitious composites [1][2][3][4][5][6][7][8][9][10]. The addition of PVA fiber can increase the compressive strength, tensile strength, and flexural strength of cementitious composites [11][12][13][14][15][16]. However, there is a risk of aging under the effects of harsh environmental factors, which may lead to the failure of infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Basalt Fiber Content and Length on the Strength and Crack Development of Polyvinyl Alcohol/Basalt Hybrid Fiber-Reinforced Cement Soil

Shu

Zhang

2023

Polymers

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Polyvinyl alcohol (PVA) fiber is widely used in geotechnical engineering because of its excellent physical and mechanical properties; however, PVA fibers are prone to aging, while basalt fiber has a natural anti-aging ability, which can be added to cement material to effectively eliminate the effects of aging on PVA fiber. Previous experiments identified that the optimum content of PVA fiber is 0.5% (mass fraction, the same below). Based on this, we continued to add basalt fibers of different lengths (3 mm, 6 mm, 9 mm, 12 mm, 18 mm, 30 mm) and different contents (0%, 0.25%, 0.5%, 0.75%, 1%) to study the effect of both length and content of basalt fibers on the strength of cement soil specimens. It was concluded that adding 0.5 % of 9mm basalt fiber results in the greatest increase in unconfined compressive strength (UCS). The UCS reached 12.59 MPa, which was 71% higher than specimens without fiber, and a regression analysis was carried out to obtain the relationship among them. The ratio of cement soil in the highest UCS and the relationship among the UCS, the length, and the content of basalt fiber can be used as a reference for practical projects. In addition, digital image correlation (DIC) technology was used to analyze the surface cracks and horizontal strain field when the peak strain was reached at each content and length of the basalt fiber. Finally, the curing mechanism for hybrid fiber cement soil was analyzed by combining the results of the UCS test, DIC test, and SEM test.

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Effects of Fly Ash and Bentonite on Mechanical and Durability Properties of Fiber Reinforced Geopolymer

Cited by 2 publications

References 40 publications

Properties and Microstructure of an Interfacial Transition Zone Enhanced by Silica Fume in Concrete Prepared with Coal Gangue as an Aggregate

Properties and Microstructure of an Interfacial Transition Zone Enhanced by Silica Fume in Concrete Prepared with Coal Gangue as an Aggregate

Effect of Basalt Fiber Content and Length on the Strength and Crack Development of Polyvinyl Alcohol/Basalt Hybrid Fiber-Reinforced Cement Soil

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