|Table of Contents|

Effect of polypropylene fiber on road performance of limeash stabilizedred clay and analysis of microscopic mechanism(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年5期
Page:
34-42
Research Field:
道路工程
Publishing date:

Info

Title:
Effect of polypropylene fiber on road performance of limeash stabilizedred clay and analysis of microscopic mechanism
Author(s):
XIAO Qingyi1;  SU Gang1;  ZHANG Baohu2;  SUN Lidong3;  GONG Fangyuan1
（1. School of Civil and Transportation Engineering, Hebei University of Technology， Tianjin 300401， China;2. Tianjin Highway Engineering Corporation， Tianjin 300280， China; 3. Nangang Industrial ZonePlanning and Construction Bureau， Tianjin 300280, China）
Keywords:
road engineering;  polypropylene fiber;  limeash stabilized red clay;  mechanical property;  moisture stability;  microscopic mechanism
PACS:
-
DOI:
-
Abstract:
In order to solve the problems of brittle failure and poor water stability of the limash stabilized red clay, and achieve the purpose of enhancing the toughness and water stability of the limash stabilized red clay material, 0%, 0.15%, 0.3%, 0.45%, 0.6% polypropylene fiber content (mass fraction, the same below) reinforced the limash stabilized red clay, and based on the mechanical properties of the polypropylene fiber reinforced limash stabilized red clay through mechanical performance test, water stability test, Xray diffraction test and scanning electron microscope test, water stability and microscopic mechanism of action were analyzed. The results show that the mechanical properties of the limeash stabilized red clay continue to increase with the extension of the curing cycle. The performance of the material is improved most obviously within 60 days, and the performance increase range becomes smaller after 60 days until the performance is stable. Polypropylene fiber significantly strengthens the limeash stabilizes the compressive performance and tensile strength of the red clay in the later stage, and has little effect on the mechanical and shrinkage characteristics of the material in the early stage. The increase in the proportion of polypropylene fiber blending will make the splitting strength of the material first increase and then decrease, the role of fiber will change from the initial increase of the internal mechanical bite force of the material to the excessive number of fibers resulting in the formation of a partition. The addition of polypropylene fibers can help improve the splitting strength, compressive elastic modulus, and compressive strength of the lime stabilized red clay strength and water stability, but it is mainly manifested in the later period of curing, and there is an optimal fiber content 0.45%. The fiber is distributed in the matrix and adheres to the needleshaped crystalline material to increase the contact area with the soil. The degree of occlusion reduces the water seepage channels in the soil and improves the materials compression resistance, toughness and water stability. The polypropylene fiber reinforced limash stabilized red clay can be used as a road base or subbase material in terms of technical performance, which effectively alleviates the environmental pollution and resource waste of the waste red clay. 4 tabs, 10 figs, 28 refs.

References:

Memo

Memo:
-
Last Update: 2021-09-30