基于胶浆原理的二灰碎石设计方法

蒋应军; 富志鹏; 李宁方

doi:10.19818/j.cnki.1671-1637.2015.05.002

基于胶浆原理的二灰碎石设计方法

doi: 10.19818/j.cnki.1671-1637.2015.05.002

1.
长安大学特殊地区公路工程教育部重点实验室, 陕西西安 710064
2.
中交第一公路勘察设计研究院有限公司, 陕西西安 710075

基金项目:

陕西省交通科技项目 12-12K

详细信息

作者简介:
蒋应军(1975-), 男, 浙江兰溪人, 长安大学教授, 工学博士, 从事道路工程研究

中图分类号: U416.2
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出版历程
- 收稿日期: 2015-04-09
- 刊出日期: 2015-10-25

Design method of LSCR based on mortar theory

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

More Information

Author Bio:
JIANG Ying-jun (1975-), male, professor, PhD, +86-29-62630078, jyj@chd.edu.cn

Article Text (Baidu Translation)

摘要

摘要: 为了提高二灰碎石力学强度, 假设二灰碎石为一种三级空间网状结构的分散系, 即微分散系二灰胶浆、细分散系二灰砂浆与粗分散系二灰碎石。基于抗压强度最优原则, 采用垂直振动试验方法(VVTM)确定二灰胶浆与二灰砂浆质量比, 基于密度最大原则, 采用逐级填充法确定粗集料级配, 基于抗压强度最优原则, 确定二灰碎石中二灰砂浆用量。提出了基于胶浆原理的二灰碎石组成设计方法, 并通过室内试验与现场试验对设计方法进行性能验证。验证结果表明: 当石灰与粉煤灰质量比为2:5时, 二灰胶浆力学性能和收缩性能最佳; 当细集料质量通过率的递减系数为0.65, 二灰与细集料质量比为3:2时, 二灰砂浆力学强度最大; 当粒径范围分别为19~37.5、9.5~19、4.75~9.5 mm的集料质量比为17:11:6时, 混合粗集料密度最大; 与传统方法设计的二灰碎石试件力学强度相比, 基于胶浆原理设计的试件早期(7 d)力学强度提高10%以上, 后期(180 d)力学强度提高20%以上; 不同龄期的VVTM试件与现场芯样抗压强度之比平均为0.909, 劈裂强度之比平均为0.904, 而静压成型试件与现场芯样抗压强度之比为0.457, 劈裂强度之比为0.531, 说明VVTM比静压法设计二灰碎石更科学。
- 道路工程 /
- 胶浆原理 /
- 二灰碎石 /
- 设计方法 /
- 力学强度
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.
- road engineering /
- mortar theory /
- LSCR /
- design method /
- mechanical strength

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图 1 二灰碎石胶浆原理

Figure 1. Mortar theory of LSCR

下载: 全尺寸图片幻灯片

图 2 二灰胶浆抗压强度

Figure 2. Compressive strengths of LAM

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图 3 二灰砂浆抗压强度

Figure 3. Compressive strengths of LFAM

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图 4 Ⅰ级填充试验结果

Figure 4. Result of gradeⅠfilling experiment

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图 5 Ⅱ级填充试验结果

Figure 5. Result of gradeⅡfilling experiment

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图 6 不同二灰砂浆与粗集料质量比的抗压强度

Figure 6. Compressive strengths for different mass ratios of LFAM to coarse aggregate

下载: 全尺寸图片幻灯片

图 7 不同龄期二灰碎石试件抗压强度

Figure 7. Compressive strengths of LSCR specimens with different ages

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图 8 不同龄期二灰碎石试件劈裂强度

Figure 8. Splitting strengths of LSCR specimens with different ages

下载: 全尺寸图片幻灯片

表 1 石灰性质测试结果

Table 1. Test results of lime character

表 2 粉煤灰颗粒组成

Table 2. Grain compositions of fly-ash

表 3 粉煤灰化学成分

Table 3. Chemical compositions of fly-ash

表 4 集料技术指标

Table 4. Technical indexes of aggregates

表 5 VVTM的工作参数

Table 5. Working parameters of VVTM

表 6 不同试件的抗压强度与劈裂强度

Table 6. Compressive strengths and splitting strengths of different specimens

表 7 二灰碎石材料组成

Table 7. Composition of LSCR with different materials

表 8 建议级配与规范级配

Table 8. Suggested gradation and standard gradation

表 9 二灰碎石试件不同龄期力学强度之比

Table 9. Mechanical strength ratios of LSCR specimens with different ages

表 10 二灰碎石力学强度

Table 10. Mechanical strengths of LSCR

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