Influence of loading parameters in cyclic tension-compression regime on crack-bridging behaviour of PVA microfibres embedded in cement-based matrix

Ranjbarian, Majid; Mechtcherine, Viktor

doi:10.1016/j.conbuildmat.2019.116760

Cited by 16 publications

(33 citation statements)

References 16 publications

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“…The results highlight that the ultimate load and displacement increase with increasing PVA fiber content in mortar; such as, after 3 d curing, the ultimate load of Mortar-6.5F, Mortar-13F, and Mortar-26F is 24.8%, 53.7%, and 140.3% higher, respectively than that of Mortar-0F, and the results are 115.0%, 190.0%, and 505.0% for the ultimate displacement. This is because the bridging effect provided by the PVA fiber in cementitious materials, and the ultimate strength and strain are improved [47]. Compared with the results in Figure 10a-c, the increasing curing days improve the ultimate load of the mortar with RBP, whereas the ultimate displacement decreases with increasing curing days.…”

Section: Flexural Strength Of Shcc When Using Rbp To Replace Cement Bmentioning

confidence: 68%

Using Eco-Friendly Recycled Powder from CDW to Prepare Strain Hardening Cementitious Composites (SHCC) and Properties Determination

Wang

et al. 2020

Materials

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Using eco-friendly recycled brick powder (RBP) derived from waste brick to prepare strain hardening cementitious composites (SHCC) provides a new way of recycling the construction and demolition waste (CDW), and the dosage of cement in SHCC can be decreased. This paper investigated the micro-properties and mechanical properties of SHCC containing RBP by a series of experiments. The results showed that RBP had typical characteristics of supplementary cementitious material (SCM). The addition of RBP increased the SiO2 content and decreased the hydration products in cementitious materials; in this case, the mechanical properties of mortar decreased with increasing RBP replacements, and a linear relationship was observed between them. It was noticed that the adverse effect of RBP on the mechanical properties decreased with increasing PVA fiber content in mortar. For SHCC containing various RBP replacements, the ultimate load increased, and the ultimate displacement decreased with increasing curing days. When using RBP to replace cement by weight, the ultimate displacement increased with the addition of RBP. Meanwhile, there was no significant reduction in the ultimate load of SHCC. When using RBP to replace fly ash (FA) by weight, the incorporation of RBP decreased the ultimate displacement of SHCC, whereas the ultimate load was improved. For example, the ultimate load and displacement of SHCC with 54%RBP were 17.6% higher and 16.4% lower, respectively, than those of SHCC with 54% FA.

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Section: Flexural Strength Of Shcc When Using Rbp To Replace Cement Bmentioning

confidence: 68%

Using Eco-Friendly Recycled Powder from CDW to Prepare Strain Hardening Cementitious Composites (SHCC) and Properties Determination

Wang

et al. 2020

Materials

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“…The series of specimens previously tested under quasi-static monotonic loading as presented in [ 14 ] is used as a reference for comparison. A special loading scenario is used to study the influence of crack width and loading parameters; see Figure 2 .…”

Section: Experimental Programmementioning

confidence: 99%

“…However, low stiffness and the compressive/shear strength of the fibres caused degradation of their crack-bridging properties after repeated squeezing between the crack flanks. Ranjbarian and Mechtcherine [ 14 ] investigated this topic further at the micro-level by performing double-sided, single-fibre pull-out tests under alternating tension–compression loading and analysing the damage to the fibres microscopically after the tests. They showed that three types of damage could occur under such a loading regime: (1) defibrillation of the fibres between crack faces, (2) fibre peeling and abrasion between crack faces, and (3) superficial abrasion in the embedded part.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of small and large crack widths along with different loading parameters such as cyclic bridging stress level in the fibre, cyclic compressive stress level acting on the fracture section of the matrix, and number of cycles have been studied with respect to the development of damage on the PVA microfibres in alternating tension–compression regime. The damage quantification approach proposed by the authors in a previous study [ 14 ] has been adapted under consideration of crack width and relevant loading parameters.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Crack Width in Alternating Tension–Compression Regimes on Crack-Bridging Behaviour and Degradation of PVA Microfibres Embedded in Cement-Based Matrix

Ranjbarian

Mechtcherine

2020

Materials

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The use of high-performance polymeric microfibres in enhancing the ductility of cementitious composites is widespread. A vivid example is the application of strain-hardening cement-based composites (SHCCs) in the construction industry. However, there are a few challenges which need to be addressed with respect to material design. For instance, the ductility of SHCC diminishes under alternating tension–compression loading, where the fibres lose their crack-bridging capacity due to specific damage mechanisms. The damage development and its influence on crack-bridging capacity have been studied in previous works by the authors. The paper at hand focuses on the influence of crack width on the crack-bridging capacity of polymeric microfibres in conjunction with the number of cycles in an alternating tension–compression regime with different cyclic compressive force levels. It shows that bridging capacity can be markedly influenced by crack width: an increase in crack width leads to more severe damage to the fibres and thus to lower crack-bridging capacity. Then, after analysing the specimens by means of electron microscopy, a hypothesis is presented to address the effect of crack width on damage development. Finally, a simple approach is proposed for estimating the influence of different parameters on fibre degradation.

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“…When trying to model the highest possible number of realistic conditions of operation, pedestrian density is considered as one person per square meter. Then the load on the bridge can be calculated given the geometrical parameters of the structure [24][25][26][27][28][29].…”

mentioning

confidence: 99%

The Influence of Different Loads on the Footbridge Dynamic Parameters

et al. 2020

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Bringing together the experience and knowledge of engineers allowed building modern footbridges as very slender structures. This in turn has led to structural vibration problems, which is a direct consequence of slender structures. In some footbridges, this problem occurs when natural construction frequencies are close to excitation frequencies. This requires a design methodology, which would ensure user safety and convenience of use of the footbridge in operation. Considering the aforementioned dynamic response, the analysis of the finite element model of a footbridge was conducted focusing on critical acceleration and deformation meanings. The model was based on the footbridge prototype located in Vilnius, Lithuania. Two different loading methods were developed to investigate the dynamic effects caused by people crossing a footbridge. The comparison of experimental and finite element model (FEM) results revealed that the footbridge in operation is within the limit values of comfort requirements in terms of its vibrations.

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Influence of loading parameters in cyclic tension-compression regime on crack-bridging behaviour of PVA microfibres embedded in cement-based matrix

Cited by 16 publications

References 16 publications

Using Eco-Friendly Recycled Powder from CDW to Prepare Strain Hardening Cementitious Composites (SHCC) and Properties Determination

Using Eco-Friendly Recycled Powder from CDW to Prepare Strain Hardening Cementitious Composites (SHCC) and Properties Determination

Influence of Crack Width in Alternating Tension–Compression Regimes on Crack-Bridging Behaviour and Degradation of PVA Microfibres Embedded in Cement-Based Matrix

The Influence of Different Loads on the Footbridge Dynamic Parameters

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