|Table of Contents|

Design method of LSCR based on mortar theory(PDF)

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

Issue:
2015年05期
Page:
8-14，33
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Design method of LSCR based on mortar theory
Author(s):
JIANG Ying-jun1;  FU Zhi-peng2;  LI Ning-fang1
1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China; 2. CCCC First Highway Consultants Co., Ltd., Xi’an 710075, Shaanxi, China
Keywords:
road engineering;  mortar theory;  LSCR;  design method;  mechanical strength
PACS:
U416.2
DOI:
-
Abstract:
In order to improve the mechanical strength of lime-fly-ash-stabilized crushed rock(LSCR), LSCR was regard as a dispersed system with 3-level spatial reticular structures, including lime-fly-ash mortar(LAM)micro dispersed system, lime-fly-ash fine aggregate mortar(LFAM)fine dispersed system, and LSCR coarse dispersed system. Based on the principle of optimal compressive strength, the mass ratio of LAM and LFAM was computed by using vertical vibration test method(VVTM). Based on the principle of optimal density, the gradation of coarse aggregate was confirmed by using step-by-step filling method. Based on the principle of optimal compressive strength, the optimal amount of LFAM in the LSCR was determined. The design method of LSCR was proposed based on mortar theory, and its performance was verified by using indoor experiment and field experiment. Verification result indicates that the mechanical properties and shrinkage properties of LAM are optimal when the mass ratio of lime to fly-ash is 2:5. When the decreasing coefficient of quality passing rate of fine aggregate is 0.65, the mass ratio of lime-fly-ash to fine aggregate is 3:2, the mechanical strength of LFAM is maximum. When the mass ratio of aggregates with particle size range of 19-37.5, 9.5-19, 4.75-9.5 mm is 17:11:6, the density of mixing coarse aggregate is maximum. Compared with the mechanical strength of LSCR specimen designed by traditional method, the early stage(7 d)mechanical strength of LSCR specimen designed by mortar theory increases by more than 10%, and the late stage(180 d)mechanical strength increases by more than 20%. The average ratio of compressive strength of VVTM specimen to specimen of site is 0.909, and the average ratio of splitting strength is 0.904. The average ratio of compressive strength of static pressure compaction specimen to specimen of site is 0.457, and the average ratio of splitting strength is 0.531. The LSCR designed by VVTM is more scientific than static pressure method. 10 tabs, 8 figs, 20 refs.

References:

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Last Update: 2015-10-20