Influence of Different Fibers on Cracking Resistance of Shaft Wall Mass Concrete

2020 ◽  
Vol 852 ◽  
pp. 150-159
Author(s):  
Ji Wei Zhang ◽  
Fang Zheng Li ◽  
Shu Jie Liu
Keyword(s):  
Polyvinyl Alcohol ◽  
Steel Fiber ◽  
Basalt Fiber ◽  
Early Age ◽  
Mass Concrete ◽  
Main Function ◽  
Cracking Resistance ◽  
Polyvinyl Alcohol Fiber ◽  
Wall Mass ◽  
Shaft Wall

Early-age cracks in shaft concrete has become a serious problem in 1000m-plus deep mine due to the high internal temperature and thermal stresses. For the purpose of improve the cracking resistance of concrete, we report a novel experimental design by Temperature Stress Test Machine (TSTM) to study the influence of three fibers including basalt fiber, polyvinyl alcohol fiber and steel fiber on early-age cracking resistance of shaft wall mass concrete. Results of the experimental research indicated that (1) Three fibers can restrain expansion and shrinkage deformation finitely, and the shrinkage resistance effect of different fibers was steel fiber>polyvinyl alcohol fiber>basalt fiber; (2) Three fibers can finitely reduce the tensile stress increasing speed which was basalt fiber>polyvinyl alcohol fiber>steel fiber during; (3) The main function of fibers is restrain crack expansion and brittle failure rather than reduce cracking potential, and the rank of function is steel fiber>basalt fiber>polyvinyl alcohol fiber.

scholarly journals Experimental Study on Hybrid Effect Evaluation of Fiber Reinforced Concrete Subjected to Drop Weight Impacts

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2563 ◽  
Author(s):  
Jun Feng ◽  
Weiwei Sun ◽  
Hongzhou Zhai ◽  
Lei Wang ◽  
Haolin Dong ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Polyvinyl Alcohol ◽  
Impact Energy ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Hybrid Effect ◽  
Polyvinyl Alcohol Fiber ◽  
The Impact

In this paper, the impact energy potential of hybrid fiber reinforced concrete (HFRC) was explored with different fiber mixes manufactured for comparative analyses of hybridization. The uniaxial compression and 3-point bending tests were conducted to determine the compressive strength and flexural strength. The experimental results imply that the steel fiber outperforms the polypropylene fiber and polyvinyl alcohol fiber in improving compressive and flexural strength. The sequent repeated drop weight impact tests for each mixture concrete specimens were performed to study the effect of hybrid fiber reinforcement on the impact energy. It is suggested that the steel fiber incorporation goes moderately ahead of the polypropylene or polyvinyl alcohol fiber reinforcement in terms of the impact energy improvement. Moreover, the impact toughness of steel-polypropylene hybrid fiber reinforced concrete as well as steel-polyvinyl alcohol hybrid fiber reinforced concrete was studied to relate failure and first crack strength by best fitting. The impact toughness is significantly improved due to the positive hybrid effect of steel fiber and polymer fiber incorporated in concrete. Finally, the hybrid effect index is introduced to quantitatively evaluate the hybrid fiber reinforcement effect on the impact energy improvement. When steel fiber content exceeds polyvinyl alcohol fiber content, the corresponding impact energy is found to be simply sum of steel fiber reinforced concrete and polyvinyl alcohol fiber reinforced concrete.

scholarly journals Study on Mechanical Properties and Pore Structure of Hybrid Fiber Reinforced Rubber Concrete

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1307
Author(s):  
Yushan Liu ◽  
Jianyong Pang ◽  
Qiaoqiao Chen ◽  
Weijing Yao
Keyword(s):  
Mechanical Properties ◽  
Polyvinyl Alcohol ◽  
Pore Structure ◽  
Volume Fraction ◽  
Basalt Fiber ◽  
Hybrid Fiber ◽  
Hybrid Fibers ◽  
Polyvinyl Alcohol Fiber ◽  
Rubber Particles ◽  
Rubber Concrete

In this work, to reduce the probability of brittle failure in the support structure of deeply buried high-stress soft rock roadways, hybrid-fiber reinforced rubber concrete (HFRRC) was investigated using the orthogonal test, and the effects of various factors on the performance were studied. The mechanical properties, pore structure, and microstructure of rubber concrete reinforced by basalt fiber (BF) and polyvinyl alcohol fiber (PF) were studied from macroscale, mesoscale, and microscale perspectives. The results revealed that the content of the rubber particles has a significant impact on strength. Further, the addition of the hybrid fibers to the concrete was found to have a positive effect on the splitting tensile strength and the flexural strength. However, no significant effect was observed on the compressive strength. Furthermore, it was found that the content of BF and PF have a significant impact on the energy dissipation capacity and ductility, and the influence of the PF content is greater than that of the BF content. The concrete with 10% rubber particles of 1–3 mm, a volume fraction 0.3% basalt fiber, and a volume fraction 0.2% polyvinyl alcohol fiber was obtained as the optimal mix proportions. Moreover, it was found that the random distribution of the rubber particles and the hybrid fibers optimized the pore structure, inhibited the expansion of the cracks, and reduced the brittleness of the concrete. The findings of this study can provide a useful reference for the application of an environmentally friendly material with recycled rubber aggregate and hybrid fiber.

Enhancing the crystallization of biodegradable poly(ε-caprolactone) using a polyvinyl alcohol fiber favoring nucleation

2021 ◽  
pp. 179065
Author(s):  
Yi Li ◽  
Shilong Yao ◽  
Hechang Shi ◽  
Ye Zhang ◽  
Changyu Han ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Polyvinyl Alcohol Fiber ◽  
Biodegradable Poly
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