Mechanical properties and influencing factors of lime-fly-ash crushed rock base on vertical vibration test method(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年01期
- Page:
- 1-9
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Mechanical properties and influencing factors of lime-fly-ash crushed rock base on vertical vibration test method
- Author(s):
- JIANG Ying-jun; LI Wan-wan; FANG Jian; LIU Gen-chang
- 1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Quality Supervision Station of Jinhua Communications Department, Jinhua 321000, Zhejiang, China; 3. Xuchang Construction Investment Company Limited, Xuchang 461000, Henan, China
- Keywords:
- road engineering; mechanical property; vertical vibration test method; lime-fly-ash crushed rock; influencing factor
- PACS:
- U414
- DOI:
- -
- Abstract:
- In order to reveal the formation mechanism and influencing factors of strength of lime-fly-ash crushed rock, this paper compared the mechanical strength of specimens obtained with vertical vibration test method (VVTM) and static pressure method with that of practical engineering core samples, and proved the reliability of vertical vibration test method (VVTM). VVTM was then used to research the influence law of molding method, age, content of lime-fly ash mortar and gradation types on mechanical properties of lime-fly-ash crushed rock. The results show that the unconfined compressive strength and the splitting strength of lime-fly-ash crushed rock specimen molded with VVTM is 91.3% and 90.2% of site core samples on average, respectively. The unconfined compressive strength and the splitting strength of lime-fly-ash crushed rock specimen molded with static pressure method is 46.5% and 51.9% of site core samples on average, respectively. So specimen molded with VVTM can reflect more accurately the engineering characteristics of lime-fly-ash crushed rock. The mechanical strengths (compressive strength, splitting strength) of lime-fly-ash crushed rock of 7, 90, 120, and 180 d are about 13%, 60%, 70%, 80% of its ultimate strength, respectively, and their moduli of resilience are about 10%,50%, 60%, 70% of its ultimate resilient modulus, respectively. With the increase of lime-fly-ash mortar content, the compressive strength and modulus of lime-fly-ash crushed rock increases first and then decreases, and the splitting strength increases rapidly first and then levels off or even decreases. When lime-fly-ash mortar content is 32%, the compressive strength and compressive resilient modulus of lime-fly-ash crushed rock achieves the maximum. If it continues to increase lime-fly-ash mortar content, splitting strength of lime-fly-ash crushed rock does not increase and even decreases. The suggested lime-fly-ash mortar content should be 32%. Compared with the “Technical Guidelines for Construction of Highway Roadbases” (JTJ 034—2000), early mechanical strength and resilient modulus of dense skeleton gradation lime-fly-ash crushed rock can be improved about 1.15 times, and mechanical strength can be improved by about 20% after 120 d.
Last Update: 2017-01-21