Development of Multiscale Fiber-Reinforced Engineered Cementitious Composites with PVA Fiber and CaCO3 Whisker

Pan, Jinlong; Cai, Jingming; Ma, Hui; Leung, C.F.

doi:10.1061/(asce)mt.1943-5533.0002305

Cited by 51 publications

(29 citation statements)

References 32 publications

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“…Besides, compared with carbon nano-tubes and carbon nano-fibers, CW is easier to disperse in cementitious composite, more environmentally-friendly and more health 12 . The published researches present that CW can work alone or work together with carbonate fiber, polyvinyl alcohol fiber, polyester fiber or steel-polyvinyl alcohol hybrid fibers in improving the mechanical properties of cementitious composites at room temperature [13][14][15][16][17] . These researches indicate that CW has great potential in engineering application.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation and Porosity Fractal Dimension of Calcium Carbonate Whisker Reinforced Cement Paste After Elevated Temperatures (Up to 900∘c)

Cao

et al. 2021

Fractals

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Calcium carbonate whisker (CW) can work as a cost-effective and environment friendly micro-fiber in reinforcing cementitious composites. Influence of high temperature on micro-structure of CW reinforced cement paste by nanoindentation and mercury intrusion porosimetry test are studied in this research. Up to 500 °C, the indentation depth, elasticity modulus, indentation hardness and interfacial transition zone width of CW reinforced cement paste are near or even better than that at room temperature, due to the coupling effect of CW transformation from aragonite to calcite and internal autoclaving. However, when the temperature is higher than 700 °C, nano-mechanical properties of CW reinforced cement paste degenerated significantly, due to the decomposition of CW and hydration products. Similarly, with the increase of temperature up to 400 °C, the porosity and pore size increase little or even decrease, while the fractal dimension of pore volume increases. With the introduction of CW, the pore parameters and fractal dimension are decreased up to 400 °C, due to the filler effect of CW. When the temperature is higher than 700 °C, the pore diameter and fractal dimension of CW reinforced cement paste are significant higher than that of pure cement paste, due to the decomposition of CW and hydration products. In CW reinforced cement paste, the fractal dimension was increased with the increased temperature and porosity in this research. There are negative correlations between the pore volume fractal dimensions and the strengths of CW reinforced cement paste. Fractal dimension is a useful tool to evaluate the change of pore structure at high temperature.

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Section: Introductionmentioning

confidence: 99%

Nanoindentation and Porosity Fractal Dimension of Calcium Carbonate Whisker Reinforced Cement Paste After Elevated Temperatures (Up to 900∘c)

Cao

et al. 2021

Fractals

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“…This necessitates the search for new types of concrete, the mechanical properties of which will meet the current requirements. One of the methods to reduce the negative effects of shrinkage cracks in addition to classic bar reinforcement is the reinforcement of concrete with short, randomly distributed steel fibers (SF) [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ], polypropylene (PP) [ 2 , 9 , 10 , 11 , 12 ] and hybrid fibers [ 13 , 14 , 15 ]. There are several articles on the quite controversial use of human hair as dispersed concrete reinforcement [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Composite Concrete Slabs Made with Steel and Polypropylene Fibers Reinforced Concrete in the Compression Zone

et al. 2020

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The paper presented aimed at examining the effect of a fiber-reinforced concrete layer in the compressed zone on the mechanical properties of composite fiber-reinforced concrete slabs. Steel fibers (SF) and polypropylene fibers (PP) in the amount of 1% in relation to the weight of the concrete mix were used as reinforcement fibers. The mixture compositions were developed for the reference concrete, steel fiber concrete and polypropylene fiber concrete. The mechanical properties of the concrete obtained from the designed mixes such as compressive strength, bending strength, modulus of elasticity and frost resistance were tested. The main research elements, i.e., slabs with a reinforced compression zone in the form of a 30 mm layer of concrete with PP or SF were made and tested. The results obtained were compared with a plate made without a strengthening layer. The bending resistance, load capacity and deflection tests were performed on the slabs. A scheme of crack development during the test and a numerical model for the slab element were also devised. The study showed that the composite slabs with fiber-reinforced concrete with PP in the upper layer achieved 12% higher load capacity, with respect to the reference slabs.

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“…The CW is microscopic reinforcement material used by many scholars to enhance the properties of cement paste, 9,17 ECC, 15 oil well cement, 16 cement mortar, 18 etc. Compared to MWCNTs and CNFs, CW achieves a satisfactorily performance increment on cement‐based materials without any special dispersion treatment 9 .…”

Section: Introductionmentioning

confidence: 99%

“…The microcrack is the primary source of crack that internally damages in cement-based material. 9,10 The common method to enhance the micromechanical properties of cement-based materials is to add the micro/nanometre materials having fibre morphology, such as multiwalled carbon nanotube (MWCNTs), 7,8,[11][12][13][14] carbon nanofibres (CNFs), 11 calcium carbonate whisker (CW) [15][16][17][18] and wollastonite, 19 etc. Addition of randomly distributed nanofibre/microfibre in cement matrix limit the preexisting defects, delay the formation of microcrack, restrain microcrack convergence to primary crack.…”

Section: Introductionmentioning

confidence: 99%

Optimization of calcium carbonate whisker reinforced cement paste for rheology and fracture properties using response surface methodology

Xie

Cao

2020

Fatigue Fract Eng Mat Struct

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Cement paste is generally used as a grouting joint material for concrete structures. A good rheology property guarantees the workability of fresh cement paste, and an excellent fracture toughness that reflects the good crack resistance of hardened cement paste. Calcium carbonate whisker (CW) is an inorganic mineral reinforcing material with excellent micromechanical performance, microcrack resistance and environmentally friendly nature. In this study, the rheological and three-point bending tests were conducted on CW reinforced cement paste (CWRCP) to evaluate workability and mechanical properties. The results showed that the yield stress (τ 0) and plastic viscosity (μ) were increased with addition of CW. This was because of the large specific surface area of CW which consumed free water and reduced lubricity between cement particles; and meanwhile, fibrous CW overlapped into net and prevented the flow of fresh cement paste. The addition of CW increased the fracture toughness (K IC) of cement paste due to its microscopic crack resistance effect. Also, the environmental scanning electron microscopy (ESEM) analysis was performed to study the microstructural characteristics. The response surface methodology (RSM) was used to evaluate the influence of CW content (v cw) and water-cement ratio (w/c) to response parameters. Additionally, multiobjective optimization technique was performed to determine best settings for design variables which satisfied ideal response parameters. Conclusively, the optimal solution of CWRCP is beneficial to acquire ideal response goal and provides the basis for engineering applications.

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Development of Multiscale Fiber-Reinforced Engineered Cementitious Composites with PVA Fiber and CaCO3 Whisker

Cited by 51 publications

References 32 publications

Nanoindentation and Porosity Fractal Dimension of Calcium Carbonate Whisker Reinforced Cement Paste After Elevated Temperatures (Up to 900∘c)

Nanoindentation and Porosity Fractal Dimension of Calcium Carbonate Whisker Reinforced Cement Paste After Elevated Temperatures (Up to 900∘c)

Flexural Behavior of Composite Concrete Slabs Made with Steel and Polypropylene Fibers Reinforced Concrete in the Compression Zone

Optimization of calcium carbonate whisker reinforced cement paste for rheology and fracture properties using response surface methodology

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