|Table of Contents|

Mechanical property of polypropylene fiber reinforced concrete under freezing-thawing cycle effect(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年04期
Page:
37-44
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Mechanical property of polypropylene fiber reinforced concrete under freezing-thawing cycle effect
Author(s):
YAN Wu-jian1; 2; 3;  NIU Fu-jun1; 2; 4;  WU Zhi-jian3;  NIU Fu-hang1;  LIN Zhan-ju1;  NING Zuo-jun5
1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences, Lanzhou 730000, Gansu, China; 2. School of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; ……
Keywords:
pavement material;  polypropylene fiber reinforced concrete;  freezing-thawing cycle;  compressive strength;  longitudinal wave velocity;  damage amount
PACS:
U416.16
DOI:
-
Abstract:
Through fast freezing-thawing cycle test on four groups of polypropylene fiber reinforced concretes with different mix proportions, the compressive strength, longitudinal wave velocity and dynamic elastic modulus of concrete after different times of freezing-thawing cycles were obtained, the mechanical property and damage amount characteristics of polypropylene fiber reinforced concrete under freezing-thawing cycle effect were studied, and the effects of material property, material mix proportion and times of freezing-thawing cycles on the mechanical property were analyzed. Analysis result shows that after 200 times of freezing-thawing cycles, the compressive strength loss rates of C30 polypropylene fiber reinforced concrete without air entraining agent, C30 polypropylene fiber reinforced concrete with air entraining agent, C40 polypropylene fiber reinforced concrete without air entraining agent and C40 polypropylene fiber reinforced concrete with air entraining agent are 46.53%, 49.05%, 34.56% and 37.64% respectively. After 300 times of freezing-thawing cycles, the longitudinal wave velocities of four groups of polypropylene fiber reinforced concretes decrease by 8.42%, 6.48%, 16.72% and 11.68% respectively, and the dynamic elastic moduli decrease by 46.54%, 35.72%, 54.41% and 53.72% respectively. After 150 times of freezing-thawing cycles, the damage amounts of C30 and C40 polypropylene fiber reinforced concrete increase rapidly, and the damage amount of C40 polypropylene fiber reinforced concrete is bigger than that of C30 polypropylene fiber reinforced concrete. Under the same times of freezing-thawing cycles, the damage amount of C40 polypropylene fiber reinforced concrete without air entraining agent is biggest. The improving effects on frost resistance property from big to small are C30 polypropylene fiber reinforced concrete with air entraining agent, C30 polypropylene fiber reinforced concrete without air entraining agent, C40 polypropylene fiber reinforced concrete with air entraining agent, C40 polypropylene fiber reinforced concrete without air entraining agent. 6 tabs, 7 figs, 28 refs.

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Last Update: 2016-08-30