Long-term performance of steel-spontaneous combustion coal gangue aggregate concrete composite slabs considering the influence of non-uniform shrinkage

Wang, Qinghe; Zhang, Tirui; Li, Zhe; Zhang, Yuzhuo; Zhou, Mi; Fang, Yang

doi:10.1016/j.conbuildmat.2023.130690

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Confining pressure has an obvious inhibitory effect on the development of ε phl , as the increasing confining pressure, ε phl decreases. 3. k hl of the coal gangue sample first decreases and then shows an increasing trend with the increasing dynamic strain.…”

Section: Discussionmentioning

confidence: 90%

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Dynamic characteristics of coal gangue subgrade filler under traffic load based on the hysteretic curves

Zhang,

Kang,

Zhang

2024

Sci Rep

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Traffic cyclic loading is the key factor that leads to the deterioration of the long-term service behavior of subgrade. A series of cyclic triaxial tests was carried out by the large-scale dynamic and static triaxial apparatus (LSDSTA) to study the dynamic behaviors of coal gangue subgrade filler (CGSF) under multi-step cyclic loading using the morphological characteristics of hysteretic curves (MCHC). MCHC was quantitatively characterized by four parameters, i.e., the unclosed degree (εphl), inclination of long axis degree (khl), area (Shl) and fullness degree (αhl). With the increase of dynamic strain, εphl increases exponentially. khl of the coal gangue sample first decreases and then shows an increasing trend with the increasing dynamic strain. The values of Shl are close to each other, and the energy dissipation in the sample is small. However, with the increase of dynamic strain, the specimen failure degree is increased, Shl increases exponentially, and the damping ratio increases. With the increase of dynamic strain, αhl increases approximately linearly. Confining pressure has a certain effect on the four parameters. There parameters can be recommended and used for quantitative analysis the dynamic behaviors of subgrade filler under traffic cyclic loading.

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Section: Discussionmentioning

confidence: 90%

“…Coal gangue is a type of hard black rock with low carbon content, which is separated during mining and washing processes and becomes waste 1 – 3 . The massive use of coal gangue waste has always been a hot topic concerned by many scholars 4 – 7 .…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of coal gangue subgrade filler under traffic load based on the hysteretic curves

Zhang,

Kang,

Zhang

2024

Sci Rep

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“…However, SCCG resources are limited, and most of the coal gangue stored in mining areas are non-spontaneous combustion coal gangues (NSCCGs). Currently, there are two main ways to utilize NSCCGs [ 5 , 12 , 13 , 14 , 15 , 16 ]. The first is to use it as a raw material for cement production; however, its poor homogeneity makes it unsuitable, which limits the wide utilization of NSCCGs in cement production.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Improving Activity of Calcinated Coal Gangue via Increasing Calcium Content

Zhao

Zhang

et al. 2023

Materials

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In this investigation, non-spontaneous combustion coal gangue was activated by two methods: (1) low-temperature calcination and (2) calcium addition. Differences in the activity of the activated coal gangue were studied at various calcination temperatures and amounts of calcium addition. Meanwhile, the cementation activity of the activated coal gangue was evaluated according to the activity effect analysis. Furthermore, the influences of the activated coal gangue on the cementation activity of cement were investigated. The results indicated that the activities of the activated coal gangue increased at a temperature between 500 °C and 700 °C. The calcium addition method can also increase the activity of coal gangue, with the effect being better when the gangue is mixed with slag. The addition of calcium and the calcination of coal gangue can promote the production of active minerals such as metakaolin, which is the main reason for the increased cementation activity.

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Shrinkage model for concrete incorporating coal gangue coarse and fine aggregates

Gao,

Zhang,

et al. 2023

Journal of Building Engineering

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Long-term performance of steel-spontaneous combustion coal gangue aggregate concrete composite slabs considering the influence of non-uniform shrinkage

Cited by 5 publications

References 8 publications

Dynamic characteristics of coal gangue subgrade filler under traffic load based on the hysteretic curves

Dynamic characteristics of coal gangue subgrade filler under traffic load based on the hysteretic curves

Experimental Research on Improving Activity of Calcinated Coal Gangue via Increasing Calcium Content

Shrinkage model for concrete incorporating coal gangue coarse and fine aggregates

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