Study on compressive strength and durability of alkali-activated coal gangue-slag concrete and its mechanism

Ma, Hui; Zhu, Hongguang; Wu, Chao; Chen, Hongyu; Sun, Jianwei; Liu, Jinyan

doi:10.1016/j.powtec.2020.04.054

Cited by 98 publications

(35 citation statements)

References 39 publications

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“…With the strategic goal of carbon neutrality, the use of alkali-activated slag as cementing material for the production of a solid-waste coal gangue road stabilization layer is proposed in this paper, which could make full use of its energy savings, environmental protection, fast hardening, early strength, excellent corrosion resistance, fire resistance, and durability [31][32][33]. By studying the relationship between the coal gangue aggregate rate and the mechanical properties of stable materials under different alkali equivalents, the feasibility of alkali-stimulated slag-cemented coal gangue road stabilization materials is analyzed, and its structural characteristics are explained via microstructure analysis, providing a basis for the development of solid-waste coal gangue road stabilization materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Mechanical and Microstructure Characteristics of Coal Gangue Road Stabilization Materials Based on Alkali Slag Cementation

Wang

Yang

2021

Materials

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To accelerate the resource utilization of coal gangue and meet the strategic requirements of carbon neutralization, alkali-activated, slag-cemented coal gangue is applied in the preparation of solid waste-based road stabilization materials. Here, the cementation characteristics and microstructure characteristics of alkali-activated, slag-cemented coal gangue road stabilization materials are studied using the alkali equivalent and coal gangue aggregate ratio as experimental variables. The results show that with the increase in alkali equivalent from 1% to 7%, the unconfined compressive strength of the alkali-activated coal gangue road stabilization material initially increases and then decreases, with 3% being the optimal group in terms of stabilization, the aggregate ratio of coal gangue increases from 70% to 85%, and the 7-day unconfined compressive strength of the stabilized material decreases approximately linearly from 8.16 to 1.68 MPa. At the same time, the porosity gradually increases but still meets the requirements of the specification. With the increase in hydration time, a large number of hydration products are formed in the alkali slag cementation system, and they are closely attached to the surface of and interweave with the coal gangue to fill the pores, resulting in the alkali slag slurry and coal gangue being brought closer together.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of the Mechanical and Microstructure Characteristics of Coal Gangue Road Stabilization Materials Based on Alkali Slag Cementation

Wang

Yang

2021

Materials

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“…e large amount of coal gangue in China has caused the environmental problems, and it is urgent to develop new directions to consume this huge amount of coal gangue. Many researchers have been devoted to explore the possible way to utilize the coal gangue in China [1][2][3][4][5]. Gao et al [6] utilized coal gangue as a replacement of coarse aggregate in structural concrete and proposed a model for predicting the compressive strength of coal gangue concrete.…”

Section: Introductionmentioning

confidence: 99%

Axial Compression of Glass Fiber Tube‐Gangue Concrete‐Steel Tubular Hollow Columns

Zhang

Zheng

Zhao

et al. 2021

Advances in Materials Science and Engineering

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The replacement of coal gangue for aggregate in concrete can not only reduce the construction cost but also improve the environmental condition. The GFRP-coal gangue concrete-steel tubular (GGCS) columns provide a way to consume the coal gangue. The target of this work is to validate the feasibility of replacing ordinary concrete with coal gangue concrete and investigate the compression behavior of GGCS columns. The nonlinear analysis program of GGCS hollow columns under axial compression was proposed, and the axial compression tests of seven GGCS hollow columns were carried out. The program was verified through experimental results. On the basis of the correctness of the program, the influences of the typical parameters, such as the thickness of the glass fiber tube, the thickness of the steel tube, and the outer radius of the steel tube, on its axial compression performance were systematically analyzed. Finally, the analytical formula for predicting the axial bearing capacity of GGCS hollow column was proposed. The comparison of results indicated that the analytical results agreed well with the experimental results. The axial compression capacity of GGCS hollow columns increased linearly with the increase of the thickness of the glass fiber tube and the steel tube, but not linearly with the decrease of the outer radius of the steel tube. With the increase of the thickness of the glass fiber tube, the constraint effect of the glass fiber tube on gangue concrete was improved. With the increase of the thickness of the steel tube, the stiffness of GGCS hollow column increased. The conclusions of the presented work can provide references for the design and calculation of the GGCS columns.

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“…Shahrajabian and Behfarnia [21] reported that an AASC mixed with Al 2 O 3 exhibited improved frost resistance. Ma et al [22] reported that AASC freeze-thaw damage was caused by damage to the aggregate and mortar interface area and that the increasing damage led to the final failure. However, the failure of AASC by fatigue mainly focuses on the study of damage mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Flexural Fatigue Life Reliability of Alkali‐Activated Slag Concrete Freeze‐Thaw Damage in Cold Areas

Chen

Wang

2021

Advances in Materials Science and Engineering

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Studying the application of alkali-activated slag concrete for roads in cold areas is of great significance for promoting and developing green building materials. In this study, the effect of freeze-thaw damage on the flexural fatigue properties of alkali-activated slag concrete was studied and the fatigue life of alkali-activated slag concrete with various degrees of damage after freeze-thaw cycles was studied through a three-point flexural test. The results show that the flexural fatigue life decreases with freeze-thaw cycles from 0 to 150 times. Through a distribution fitting test and K-S test results, the flexural fatigue life followed both the two-parameter and three-parameter Weibull distributions. Between them, the three-parameter Weibull distribution fitting had a higher accuracy and better test results. The results of the reliability analysis show that the curves of alkali-activated slag concrete samples with various degrees of freeze-thaw damage for various failure probabilities have good correlation under different stresses, and the correlation correlations were greater than 0.81. The flexural fatigue life of alkali-activated slag concrete samples with various degrees of freeze-thaw damage was more sensitive to freeze-thaw damage under high stresses. It is suggested that the fatigue design of alkali-activated slag concrete should consider the adverse effects of cold areas, and the reliability should be improved accordingly.

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Study on compressive strength and durability of alkali-activated coal gangue-slag concrete and its mechanism

Cited by 98 publications

References 39 publications

Experimental Study of the Mechanical and Microstructure Characteristics of Coal Gangue Road Stabilization Materials Based on Alkali Slag Cementation

Experimental Study of the Mechanical and Microstructure Characteristics of Coal Gangue Road Stabilization Materials Based on Alkali Slag Cementation

Axial Compression of Glass Fiber Tube‐Gangue Concrete‐Steel Tubular Hollow Columns

Flexural Fatigue Life Reliability of Alkali‐Activated Slag Concrete Freeze‐Thaw Damage in Cold Areas

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