Early-Age Cracking Resistance of Multiscale Fiber-Reinforced Concrete with Steel Fiber, Sisal Fiber, and Nanofibrillated Cellulose

Cao, Qi; Zheng, Haibo; Ju, He; Lin, Zhibin; Zhou, Changjun; Jia, Jinqing

doi:10.1061/(asce)mt.1943-5533.0004718

Cited by 11 publications

(5 citation statements)

References 20 publications

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“…Figure 11 shows a typical hysteresis curve. The area enclosed by the hysteresis curve [13] can be approximated as ΔW under each dynamic load, and the area of triangle OAA′ is W under each dynamic load [8]. The formula for the total energy stored, W, is the following:…”

Section: Equivalent Damping Ratio Variation Patternmentioning

confidence: 99%

“…Li et al [7] found that sisal fibres could significantly improve the cohesion of the soil, but the increase in the angle of internal friction was small. Cao et al [8] studied the early crack resistance of sisal fibre-modified concrete. Ma et al [9] investigated the effect of organic polyurethane polymers and sisal fibres on the mechanical properties of sandy soils.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Dynamic Characteristics and Microscopic Mechanism of Lightweight Soil Modified with Expanded Polystyrene and Sisal Fibre

Zhuang,

Zhao

2023

Applied Sciences

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With the increasing demand and use of highways, railways and tunnels in China, the phenomena of foundation settlement, uneven deformation and ground cracking caused by the cyclic loading by traffic are becoming increasingly significant. There is now an emphasis on research to prevent or decrease these phenomena by mixing new materials into the soil body. In this study, cyclic loading tests were conducted on lightweight soils modified with expanded polystyrene (EPS) and sisal. A GDS true/dynamic triaxial apparatus was used to study the dynamic elastic modulus and damping ratio of clays with different dosages of EPS and sisal fibre. The modified soil samples were tested, and then, they underwent micro-scale analysis. The results showed that, with the continuous increase in EPS doping and dynamic stress, the trend of the growth of the dynamic strain of the specimens increased. At the same time, with the increase in the dynamic strain, the dynamic elastic modulus decreased, and the trend increased with increasing doping of the soil with EPS particles. A comparison of the improvement effect coefficient of the soil samples showed that the most suitable EPS doping volume was 5%. Different dosages of sisal fibre were added to the most suitable EPS-modified lightweight soil, and the dynamic elastic modulus first increased and then decreased with increasing sisal dosage. In addition, the damping ratio first increased and then decreased. The best dynamic performance of the soil was obtained when the dosage of sisal was 1.2%. Nuclear magnetic resonance and electron microscope scanning tests verified that, when the sisal doping was 1.2%, the soil particles had the largest compactness, the best interparticle bonding and the best improvement effect.

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Section: Equivalent Damping Ratio Variation Patternmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Dynamic Characteristics and Microscopic Mechanism of Lightweight Soil Modified with Expanded Polystyrene and Sisal Fibre

Zhuang,

Zhao

2023

Applied Sciences

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“…The viscosity modifying effect of MFC also results from the flexible and nanometric fibrillar structure of filaments, leading to the creation of nanoscale fibril networks [34]. As a result of this viscosity-modifying effect introduced by the addition of MFC gel, the viscosity buildup was reduced, leading to an increase in the flowability of the MFC gel-reinforced concrete [35,36]. According to Yadykova and Ilyin [37], cellulose microfib-rils adsorb on the surface of cement and sand particles, thereby reducing the interaction between them, as the interaction between cellulose particles, as organic matter, is weaker than between two inorganic particles with high surface energy.…”

Section: Introductionmentioning

confidence: 99%

Synergic Effect of Recycled Carbon Fibers and Microfibrillated Cellulose Gel for Enhancing the Mechanical Properties of Cement-Based Materials

Sambucci,

Nouri,

Tayebi

et al. 2023

Gels

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A new hybrid fiber blend containing microfibrillated cellulose (MFC) gel and recycled carbon short fiber (RCSF) was implemented for designing fiber-reinforced cement mortars, to further improve the mechanical properties and enhance the sustainability of cement-based materials. The individual impact of single fibrous fillers as well as the synergistic effect of a hybrid fiber system (MFC + RCSF) were investigated in terms of the rheological properties, mechanical strength, and microstructure of the mortars. The results indicated that the workability of fresh mixtures slightly increased after fiber addition. The fibers incorporated alone improved the materials’ performance in different ways. The addition of RCSF led to improvements of up to 76% in flexural strength and 13% in compression strength for a fiber content of 0.75 wt.%. However, the addition of carbon fibers led to slight deteriorations in terms of porosity and water absorption. On the other hand, the use of MFC induced a less significant growth in terms of mechanical strength (+14% in flexural strength for 0.75 wt.% of cellulose) but greatly improved the microstructural quality of the mortar, significantly reducing its water permeability. Considering the optimum MFC dosage, MFC+RCSF hybrid mixtures showed positive effects on the mechanical properties and microstructure of the mortar, displaying further improvements in strength, while preserving a lower porosity and water absorption than the control mix.

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“…Adding fibers to concrete is a good solution for its stress cracking. Steel fibers, as a commonly used fiber addition, can significantly improve the tensile strength, toughness, and cracking resistance of the concrete matrix [25,26]. Therefore, three groups of commonly used MiC formworks with different material component types are designed for static loading tests.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties of MiC Formworks with Different Material Components

Wang,

Yang,

Chen

2023

Buildings

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Modular integrated construction (MiC) is a new type of assembled building structure system that consists of prefabricated concrete modules connected using post-cast concrete. To reduce material consumption and realize casting without supporting molds, thin and lightweight concrete formworks (MiC formworks) with a thickness of 30 mm are installed as part of the shear wall. Due to the thinness, concrete pouring tends to cause MiC formwork cracking, mold rising, and other problems. Its stress performance and damage mechanism are not clear. For this reason, three groups of MiC formworks with different material composition types are designed. The static load test is carried out in a graded partition loading mode, and parametric analysis is combined with numerical simulation to systematically study the influence of different material components on the mechanical properties of MiC formworks. The results show that the front cracks of the MiC formworks are mainly distributed under the truss tendons, and the back cracks are mainly distributed in the span position of the adjacent truss tendons. These cracks both occur along the span direction of the MiC formworks. Increasing the concrete strength has a significant effect on improving the load-bearing capacity of MiC formworks, while incorporating steel fibers can significantly improve its deformation and crack resistance. Parametric analysis showed that the steel fiber admixture exhibited limited improvements in the cracking resistance of the panels as the concrete matrix grade increased. The research results provide a practical basis for optimizing the production process of MiC formworks.

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Early-Age Cracking Resistance of Multiscale Fiber-Reinforced Concrete with Steel Fiber, Sisal Fiber, and Nanofibrillated Cellulose

Cited by 11 publications

References 20 publications

Experimental Study of the Dynamic Characteristics and Microscopic Mechanism of Lightweight Soil Modified with Expanded Polystyrene and Sisal Fibre

Experimental Study of the Dynamic Characteristics and Microscopic Mechanism of Lightweight Soil Modified with Expanded Polystyrene and Sisal Fibre

Synergic Effect of Recycled Carbon Fibers and Microfibrillated Cellulose Gel for Enhancing the Mechanical Properties of Cement-Based Materials

Study on the Mechanical Properties of MiC Formworks with Different Material Components

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