The influence of fly ash content on ITZ microstructure of coal gangue concrete

Qiu, Jisheng; Zhou, Yunxian; Guan, Xiao; Zhu, Mengyu

doi:10.1016/j.conbuildmat.2021.123562

Cited by 49 publications

(14 citation statements)

References 22 publications

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“…The pores between the sandstone particles were covered with a cement hydration product. This result is consistent with typical laws of the aggregate influence on the micromorphology of the ITZ reported in the literature [7].…”

Section: Thickness Of Itzsupporting

confidence: 93%

“…The pores betwee sandstone particles were covered with a cement hydration product. This result is sistent with typical laws of the aggregate influence on the micromorphology of the reported in the literature [7]. The hydration products in granite-concrete and sandstone-concrete specimen uniformly filled with residual pores.…”

Section: Thickness Of Itzsupporting

confidence: 87%

“…Referring to the research method of the ITZ pore structure in the literature [7], the pore characteristics of the mortar between 2 to 3 mm around the rock were measured by NMR imaging system to characterize the influence of different types of rock on the pore structure of the ITZ. The results are shown in Figure 9.…”

Section: Pore Structure Of Itzmentioning

confidence: 99%

“…The results showed that the porosity and micro-fracture length gradually increased while the average pore size decreased with the curing process. Several researchers [7][8][9][10][11] have studied the effect of the concrete mixture on the ITZ microstructures by adding silica fume, nano-silica, rice husk ash, kaolin, slag, fly ash, pozzolan, etc. It is believed that the addition of colloids can fill the accumulation pores of cement particles and reduce the content of calcium hydroxide (CH), increasing the ITZ compactness.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Pore Structure and Permeability of Concrete–Rock Interfacial Transition Zones Based on Fractal Theory

et al. 2022

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The concrete–rock interfacial transition zone (ITZ) is generally considered the weak layer in hydraulic engineering, for it is more permeable than the intact concrete or rocks. The water permeability of the ITZ is a critical parameter concerned with structural safety and durability. However, the permeability and pore structure of the ITZ has not been investigated previously, and the mathematical model of ITZ permeability has not been established. This study performed multi-scale experiments on the concrete–rock ITZ with various rock types (limestone, granite, and sandstone). A series of quantitative and qualitative analysis techniques, including NMR, SEM-EDS, and XRD, characterize the ITZ pore structures. The controlled constant flow method was used to determine the permeability of the concrete, rock, and ITZ. The mathematical model of ITZ permeability was proposed using the fractal theory. The consistency between the experimental data and the proposed model indicates the reliability of this study. The results of the experiment show that ITZ permeability is between 4.08 × 10−18 m2 and 5.74 × 10−18 m2. The results of the experiment and the proposed model could determine ITZ permeability in hydraulic structure safety and durability analysis.

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Section: Thickness Of Itzsupporting

confidence: 93%

Section: Thickness Of Itzsupporting

confidence: 87%

Section: Pore Structure Of Itzmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation on Pore Structure and Permeability of Concrete–Rock Interfacial Transition Zones Based on Fractal Theory

et al. 2022

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“…In addition, the accumulation of industrial solid waste such as fly ash will occupy many land resources, and dust will also cause serious air pollution. Therefore, replacing cement with industrial waste mineral admixtures is the secondary utilization of industrial solid waste, which has significant ecological and environmental benefits [ 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties, Wear Resistance and Microstructure of Hybrid Fiber-Reinforced Mortar Containing High Volume of Industrial Solid Waste Mineral Admixture

Jia

Yuan

et al. 2022

Materials

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The use of a high volume of industrial solid waste mineral admixture and hybrid fiber can greatly reduce the amount of cement in mortar or concrete, improve its performance, ensure the service properties of mortar or concrete, and reuse industrial solid waste to reduce the environmental burden, which has significant research significance. In this paper, the mechanical properties, wear resistance and microstructure of hybrid fiber-reinforced mortar (HFRM) with a high content of industrial solid waste mineral admixture were systematically studied under different water/binder ratios. Mineral admixtures include fly ash, silica fume and granulated blast furnace slag (slag). The total content of hybrid glass fiber (GF) and polypropylene fiber (PPF) was 2% by volume fractions, and six different water/binder ratios ranging from 0.27 to 0.62 were used. The following conclusions were drawn: fibers have a significant negative effect on the properties of mortars with a low water/binder ratio (w/b = 0.27) and high content of mineral admixtures. In general, the effect of adding hybrid fiber on improving the wear resistance of mortar is more obvious. The average residual weight of hybrid fiber-reinforced mortar is the highest after the wear resistance test. Comprehensively considering the compressive strength, flexural strength, wear resistance and microstructure of the mortar samples, G8PP2-0.40 is the optimal mix ratio. At this time, the replacement rates of fly ash, silica fume and slag are: 20%, 5% and 30%, the water/binder ratio is 0.40, and the content of GF and PPF is 1.6% and 0.4%, respectively.

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Effect of the co-activation of sodium silicate and CO2 on setting and mechanical properties of coal gangue-fly ash backfill (CGFB)

Ngo

Zhai

et al. 2023

Environ Earth Sci

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The influence of fly ash content on ITZ microstructure of coal gangue concrete

Cited by 49 publications

References 22 publications

Investigation on Pore Structure and Permeability of Concrete–Rock Interfacial Transition Zones Based on Fractal Theory

Investigation on Pore Structure and Permeability of Concrete–Rock Interfacial Transition Zones Based on Fractal Theory

Study on the Mechanical Properties, Wear Resistance and Microstructure of Hybrid Fiber-Reinforced Mortar Containing High Volume of Industrial Solid Waste Mineral Admixture

Effect of the co-activation of sodium silicate and CO2 on setting and mechanical properties of coal gangue-fly ash backfill (CGFB)

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