Effect of Polypropylene Fiber on the Strength and Dry Cracking of Mortar with Coal Gangue Aggregate

Zhu, Kai; Ma, Xing; Li-yang, Yao; Zhao, Linlin; Luo, Chuangdan

doi:10.1155/2021/6667851

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…In addition to steel fibers, polypropylene, glass, basalt, and plant fibers have different degrees of improvement on coal gangue concrete. With the increase of the volume content of polypropylene fiber, the fluidity further decreased [108]; compressive strength and bending strength reached the highest level at 6% of the content, and the drying shrinkage and cracking properties reached the lowest when the fiber content was 9%. Figure 23 shows the bending fracture diagram of coal gangue concrete mixed with polypropylene fiber.…”

Section: Other Fibersmentioning

confidence: 97%

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

et al. 2022

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Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. Producing concrete with coal gangue aggregate is one of the green sustainable development requirements. This paper reviews the properties and preparation methods of Chinese gangue aggregate, studies the influence of gangue aggregate on concrete properties and the prediction model of gangue concrete, and summarizes the influence of modified materials on gangue concrete. The studies analyzed in this review show that different treatments influence the performance of coal gangue aggregate concrete. With the increase in the replacement ratio of coal gangue aggregate in concrete, the concrete workability and mechanical performance are reduced. Furthermore, the pore structure changes lead to decreased porosity, greatly affecting the durability. Coal gangue is not recommended for producing high-grade concretes. Nevertheless, pore structure can be improved by adding mineral admixtures, fibers, and admixtures to the coal gangue concrete. Hence, the working properties, mechanical properties, and durability of the concrete can be improved effectively, ensuring that coal gangue concrete meets engineering design requirements. Adding modified materials to coal gangue concrete is a viable future development direction.

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Section: Other Fibersmentioning

confidence: 97%

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

et al. 2022

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“…Coal gangue is usually piled up in the open air, not only occupying a lot of land but also polluting the surrounding soil and groundwater (Zhu et al, 2021). Research shows that mechanical treatment of coal gangue can not only destroy the mineral deposits but accelerate the fracture of the silica bond, increase the speci c surface area and lead to the active effect of coal gangue (Ding et al, 2021).…”

Section: )mentioning

confidence: 99%

Ecological Mortar from Recycled Composite Powder with Waste Clay Brick and Coal Gangue

Wang

Lyu

et al. 2022

Preprint

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The clay brick and powder recycled from construction and industrial waste may be utilized as recycled construction materials. To alleviate the negative environmental impact of the cement industry’s CO2 emission, waste clay brick was used as fine aggregate, clay brick powder (CBP), and coal gangue powder (CGP) were utilized as supplementary materials to partly substitute the cement. The physical properties, mechanical properties, and durability of ecological mortar were investigated with microstructure analysis and revealed that the replacement of cement with recycled composite powder generally harms the performance of ecological mortar, and this impact is found to be less significant in proper mix proportions (5:5). Furthermore, a limited clay brick fine aggregate (CBFA) replacement rate under 20% exhibited higher mechanical properties. The hydration products of pozzolanic activity resulted in densification and enhanced the microstructure of the mortar framework. The result obtained by the investigation help promote the development of the synergetic application of waste clay brick and coal gangue as supplementary cementitious materials in the full component ecological mortar and green construction materials.

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“…The preparation of a coal-gangue-reinforced base mixture has been extensively investigated. Zhu et al [9] examined the influence of polypropylene fibers on the fluidity, strength, cracking, and dry shrinkage performance of gangue mortar and reported that polypropylene fibers reduced the fluidity of gangue mortar but improved its compressive and flexural strengths. Furthermore, they reported that polypropylene fibers effectively reduced the risk of gangue mortar's dry shrinkage and cracking.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Furnace Slag and Coal Gangue Mixtures Stabilized by Cement and Fly Ash

Zhang

Yan

et al. 2021

Materials

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The mechanical properties and strength formation mechanism of cement–fly-ash-stabilized slag–coal gangue mixture were examined using an unconfined compressive strength test, splitting strength test, triaxial test, and scanning electron microscopy to solve the limitations of land occupation and environmental pollution that is caused by fly ash from the Xixia District thermal power plant in Yinchuan, slag from the Ningdong slag yard, and washed coal gangue. Its performance as a pavement base mixture on the road was investigated. The results demonstrated that as the slag replacement rate increased, the maximum water content increased while the maximum dry density decreased. The addition of slag reduced the unconfined compressive strength and splitting strength of the specimens; furthermore, the higher the slag substitution rate, the lower the unconfined compressive strength and splitting strength of the specimens. As the cement content increased, the specimen’s unconfined compressive strength increased. Based on the principle of considering the mechanical properties and economic concerns, the slag replacement rate in the actual construction should be ~50% and should not exceed 75%. Based on the relationship between the compressive strength and splitting strength of ordinary concrete, the relationship model between the unconfined compressive strength and splitting strength of cement–fly-ash-stabilized slag–coal gangue was established. The failure mode, stress–strain curve, peak stress, and failure criterion of these specimens were analyzed based on the triaxial test results, and the relationship formulas between the slag substitution rate, cement content, peak stress, and confining pressure were fitted. As per the SEM results, the mixture’s hydration products primarily included amorphous colloidal C-S-H, needle rod ettringite AFt, unhydrated cement clinker particles, and fly ash particles. The analysis of the mixture’s strength formation mechanism showed that the mixture’s strength was the comprehensive embodiment of all factors, such as the microaggregate effect, secondary hydration reaction, and material characteristics.

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Effect of Polypropylene Fiber on the Strength and Dry Cracking of Mortar with Coal Gangue Aggregate

Cited by 5 publications

References 20 publications

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

Ecological Mortar from Recycled Composite Powder with Waste Clay Brick and Coal Gangue

Mechanical Properties of Furnace Slag and Coal Gangue Mixtures Stabilized by Cement and Fly Ash

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