Influence of coarse fly ash on the performance of foam concrete and its application in high-speed railway roadbeds

She, Wei; Du, Yi; Zhao, Guotang; Pan, Feng; Zhang, Yunsheng; Cao, Xiaoyu

doi:10.1016/j.conbuildmat.2018.02.207

Cited by 155 publications

(30 citation statements)

References 23 publications

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“…The use of foamed concrete for subgrade filling can effectively reduce the additional stress of foundation, thus effectively controlling the settlement of subgrade without soft soil foundation treatment. Foamed concrete has good integrity and small dead weight, and the method of choosing foam concrete as subgrade filler achieved good results in controlling settlement of soft soil subgrade [ 11 ], while it can also reduce the cost of follow-up operation and maintenance, with significant comprehensive benefits [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Effect Analysis of Soil Type and Silt Content on Silt-Based Foamed Concrete with Different Density

Hong-bo

Ma³

et al. 2020

Materials

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This paper investigates the influence of silt content and coarse particle content on the mechanical and physical properties of foamed concrete, including compressive and flexural strength, modulus of elasticity, water absorption, drying shrinkage, and air-void structure. Four types of silt with different coarse particle contents were obtained by soil mixing. The results showed that high density, low silt content, and high coarse particle content can provide better mechanical properties. High silt content and high coarse particle content would lead to lower drying shrinkage. Silt content was the main factor affecting the pore distribution of foamed concrete, and higher coarse particle content could optimize the air-void structure. Meanwhile, the change in air-void structure can accordingly affect the water absorption of foamed concrete. Results showed that, at the same density and silt content, higher coarse particle content can optimize the physical and mechanical properties of foamed concrete.

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Section: Introductionmentioning

confidence: 99%

Effect Analysis of Soil Type and Silt Content on Silt-Based Foamed Concrete with Different Density

Hong-bo

Ma³

et al. 2020

Materials

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“…According to Falliano et al [17] and Kearsley and Wainwright [18], the compressive strength of foam concrete with a density of 1000∼1500 kg/m 3 was 2.8∼19 MPa, and the compressive strength increased with the experimentation time. However, most previous studies that focused on the characteristics of foam concrete, including those conducted by Ramamurthy et al [9], She et al [19], Nambiar and Ramamurthy [20], Jones and McCarthy [21], Hajimohammadi et al [22], and Ma and Chen [23], and the studies by Liu et al [24], Zhu and Xie [25], Tian et al [26], and Bagheri et al [27], who examined the mechanical properties of foam concrete, were performed under static loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Foam Concrete under Impact Loading Based on SHPB Experiments

Gao

Zhao

et al. 2019

Shock and Vibration

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This paper presents an innovative method for using foam concrete as a typical building material for soft structures in underground coal mines subjected to dynamic loading. To understand the behaviour of foam concrete under impact loading, a total of 30 specimens with a diameter of 50 mm and a height of 50 mm were experimentally tested using a 75 mm diameter split Hopkinson pressure bar (SHPB) device. The key parameters investigated in the present study included the type of foam concrete (fly ash and sand), the density of foam concrete (1000, 1200 and 1400 kg/m3), and the impact velocity (3.0, 4.0, 5.0, 6.0, and 7.0 m/s). Six specimens were also tested under static loading for comparison. The stress-strain curve of foam concrete under impact loading showed three stages, started with a linear elastic stage, followed by a yield stage and ended with a pore wall destruction stage. The test results also indicated that the dynamic increase factor, ultimate compressive strength, tenacity, and specific energy absorption increase with the strain rate under the same density. In particular, both the failure model and the behaviour of foam concrete were affected by the impact velocity. The findings of this research provide a reference for further research on the application of foam concrete in underground coal mines.

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“…For most cases, a small amount of inclusion of finer particles results in a higher strength of foam concrete. Fly ash is also considered as a filler in some studies [20,[26][27][28] and a favorable effect has been seen with respects to workability and strength; however, the physical and chemical nature of fly ash can be quite different to typical particle fillers. Some discussions on using other recycled fine aggregates in foam concrete are also found in literature [2,29].…”

Section: Introductionmentioning

confidence: 99%

Crushing Performance of Ultra-Lightweight Foam Concrete with Fine Particle Inclusions

Shen

Lange

2019

Applied Sciences

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Foam concrete is a low-density controlled strength material that can potentially be used for accommodating different types of particles—recycled fine aggregate being an example. The paste matrix of this material has a cellular microstructure, and bulk performance is readily affected by the inclusion of fines. To study the effect of inclusion of fines on mechanical performance and foam structure of foam concrete, a group of 0.55 g/cm3 foam–sand composite mixtures with high-volume fly ash replacement are investigated. The elastic modulus is measured by a vibrational frequency test. The crushing mechanics are determined by the load-displacement response from a penetration test. The effect of particle inclusion on the foam concrete microstructure is characterized using micro computed tomography. The results indicate that use of fine-graded sand particles at a small dosage simultaneously reduces cement content and enhances the crushing performance, however poor material performance is observed for a high sand content. The cellular structure of the foam–sand composite, and thus its mechanical behavior, can be substantially diminished by larger sand particles, especially when the particle size is larger than the voids in foam.

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Influence of coarse fly ash on the performance of foam concrete and its application in high-speed railway roadbeds

Cited by 155 publications

References 23 publications

Effect Analysis of Soil Type and Silt Content on Silt-Based Foamed Concrete with Different Density

Effect Analysis of Soil Type and Silt Content on Silt-Based Foamed Concrete with Different Density

Behaviour of Foam Concrete under Impact Loading Based on SHPB Experiments

Crushing Performance of Ultra-Lightweight Foam Concrete with Fine Particle Inclusions

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