Flexural properties of PVA fiber reinforced high ductility cementitious composites containing calcium carbonate whisker

2021 ◽  
Vol 300 ◽  
pp. 124329
Author(s):  
Zhen Yuan ◽  
Cong Zhang ◽  
Chaofan Xia ◽  
Lishan Wu ◽  
Zhihui Yu ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Flexural Properties ◽  
Cementitious Composites ◽  
High Ductility ◽  
Fiber Reinforced ◽  
Calcium Carbonate Whisker ◽  
Pva Fiber

scholarly journals Effectiveness of Calcium Carbonate Whisker in Cementitious Composites

2020 ◽  
Author(s):  
Mingli Cao ◽  
Mehran Khan ◽  
Shakeel Ahmed
Keyword(s):  
Calcium Carbonate ◽  
Large Scale ◽  
Low Cost ◽  
Complex Structure ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Cementitious Composites ◽  
Toughening Mechanism ◽  
Micro Scale ◽  
Calcium Carbonate Whisker

Cementitious composites are porous material having complex structure system consist of hydration products, un-hydrated cement particles and pore solutions of various scales. Calcium carbonate whisker is a new type of low cost micro-scale filler fiber gaining popularity in the field of construction materials. However, addition of whisker has effect on physical, mechanical and microstructural characteristics of cementitious composites. Also, the low production cost of whisker will make the use of micro fiber more extensive in large scale construction projects. In this study, the effect of calcium carbonate whisker on physical, mechanical and microstructural properties of cementitious composites with different fiber contents are investigated. The fluidity, drying shrinkage, pore structure, impact resistance, compressive, flexural and splitting-tensile strength of whisker-mortar are considered. The scanning electron microscopy analysis is also performed to examine the microstructural and toughening mechanism of whisker reinforced composites. It was concluded that the addition of calcium carbonate whisker up to 10 % improves the physical and mechanical properties of cementitious composites and is suggested to be the optimize content. The calcium carbonate whisker also resists the crack propagation at micro scale and showed the toughening mechanism with better interfacial properties between whisker and matrix.

scholarly journals Effect of PVA fiber on durability of cementitious composite containing nano-SiO2

2019 ◽  
Vol 8 (1) ◽  
pp. 116-127 ◽  
Author(s):  
Peng Zhang ◽  
Qing-fu Li ◽  
Juan Wang ◽  
Yan Shi ◽  
Yi-feng Ling
Keyword(s):  
Volume Fraction ◽  
Fiber Content ◽  
Nano Particles ◽  
Cementitious Composites ◽  
Cementitious Composite ◽  
Fiber Reinforced ◽  
Cracking Resistance ◽  
Carbonation Resistance ◽  
Pva Fiber

Abstract In the current investigation, the influence of polyvinyl alcohol (PVA) fibers on flowability and durability of cementitious composite containing fly ash and nano-SiO2 was evaluated. PVA fibers were added into the composite at a volume fraction of 0.3%, 0.6%, 0.9%, and 1.2%. The flowability of the fresh cementitious composite was assessed using slump flow. The durability of cementitious composite includes carbonation resistance, permeability resistance, cracking resistance as well as freezing-thawing resistance, which were evaluated by the depth of carbonation, the water permeability height, cracking resistance ratio of the specimens, and relative dynamic elastic modulus of samples after freeze-thaw cycles, respectively. The results indicated that addition of PVA fibers had a little disadvantageous influence on flowability of cementitious composite, and the flowability of the fresh mixtures decreased with increases in PVA fiber content. Incorporation of PVA fibers significantly improved the durability of cementitious composites regardless of addition of nano-particles. When the fiber content was less than 1.2%, the durability indices of permeability resistance and cracking resistance increased with fiber content. However, the durability indices of carbonation resistance and freezing-thawing resistance began to decrease as the fiber dosage increased from 0.9% to 1.2%. The fiber reinforced cementitious composite exhibited better durability due to addition of nano-SiO2 particles. Nano-SiO2 particle improves microscopic structure of fiber reinforced cementitious composites, and the nano-particles are beneficial for PVA fibers to play the role of reinforcement in cementitious composites.

Experimental Study on Mechanical Properties of PVA Fiber Reinforced Tailings Cementitious Composites

2012 ◽  
Vol 598 ◽  
pp. 618-621 ◽  
Author(s):  
Wen Bo Bao ◽  
Cheng Hong Wang ◽  
Shao Feng Zhang ◽  
Zhi Qiang Huang
Keyword(s):  
Fiber Length ◽  
Iron Ore ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Flexural Test ◽  
Multiple Cracking ◽  
Iron Ore Tailings ◽  
Mix Proportion ◽  
Pva Fiber ◽  
Fiber Reinforced Cementitious Composites

A type of ecological engineered cementitious composites, which use iron ore tailings to replace fine grinding quartz sand in PVA fiber reinforced cementitious composites, was developed. The flexural strength and toughness of this material were studied by four-point flexural test with samples of beam and sheet. The results show that the fiber reinforced tailings cementitious composites exhibit the characteristics of multiple cracking, high ductility and flexural toughness. The studies indicate that the mix proportion and the fiber length have a significant influence on the properties of this material, particularly for tensile toughness.

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