多孔混凝土的渗透系数及测试方法

郑木莲

多孔混凝土的渗透系数及测试方法

郑木莲^{1, 2,}

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.
同济大学道路与机场工程系, 上海 200092

基金项目:

陕西省自然科学基础研究计划项目 2005E207

长安大学科技发展基金项目 05Q03

详细信息

作者简介:
郑木莲(1977-), 女, 山东蒙阴人, 长安大学副教授, 工学博士, 同济大学在站博士后, 从事道路结构与材料研究

中图分类号: U414
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- PDF下载量: 285
- 被引次数: 0
出版历程
- 收稿日期: 2006-07-12
- 刊出日期: 2006-12-25

Permeability coefficient and test method of porous concrete

ZHENG Mu-lian^{1, 2
,}

1.
Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Department of Road and Airport Engineering, Tongji University, Shanghai 200092, China

More Information

Author Bio:
Zheng Mu-lian(1977-), female, PhD, associate professor, 86-29-82334450, zhengmulian@163.com

摘要

摘要: 为了有效测量多孔混凝土的渗透系数, 通过分析渗透系数的物理基础, 提出确定Darcy定律对多孔混凝土适用范围的方法, 根据常水头渗透试验原理, 考虑侧壁渗漏、套筒尺寸及测压管位置等因素, 研制出简单实用的常水头多孔混凝土渗透仪, 分析了影响渗透系数测试的试件性状和水等因素, 提出多孔混凝土渗透系数测定的试验操作过程及数据处理方法, 测试了多孔混凝土在不同配合比时的渗透系数。结果表明多孔混凝土具有良好的排水性能, 其常见配合比的渗透系数均大于10 cm.s^-1, 同时渗透系数和有效空隙率之间符合相关系数为0.968 1的幂指数关系, 可见常水头测试方法可准确有效地测定多孔混凝土的渗透系数。
- 路面工程 /
- 多孔混凝土 /
- 渗透系数 /
- 渗透仪
Abstract: In order to effectively measure the permeability coefficient of porous concrete, the physical foundation of its permeability coefficient was analyzed, an ascertaining method of Darcy law applicable range to porous concrete was put forward.According to the measurement principle of constant head permeability test, a simple and practicable constant head permeameter of porous concrete was developed on the basis of considering the factors of side wall leakage, sleeve dimension and piezometer location.Besides, the factors of test piece status and water were analyzed, the test operation and data processing method of porous concrete were proposed, and the permeability coefficients of different porous concretes were tested.Test result shows that porous concrete has fine drainage performance, its permeability coefficient is more than 10 cm·s^-1; there is power exponent relationship between its permeability coefficient and effective porosity, their correlation coefficient is 0.9681.The result indicates that the method can test the permeability coefficient of porous concrete accurately and effectively.
- pavement engineering /
- porous concrete /
- permeability coefficient /
- permeameter

HTML全文

图 1 多孔介质中流态分类

Figure 1. Fluid types of porous medium

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图 2 渗透装置

Figure 2. Permeability apparatus

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图 3 渗透装置

Figure 3. Permeability apparatus

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图 4 多孔混凝土渗透仪

Figure 4. Permeameter of porous concrete

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表 1 集料级配

Table 1. Aggregate gradations

级配类型	筛径/mm
级配类型	31.5	25.0	20.0	16.0	10.0	5.0	2.5
级配1	100	—	76~87	—	0~5	—	—
级配2	100	—	76~87	—	50~71	0~5	—
级配3	—	100	90~100	—	20~55	0~10	0~5
级配4	—	100	—	25~60	—	0~10	0~5

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表 2 临界水力梯度建议值

Table 2. Suggested values of critical hydraulic gradients

级配类型	级配1	级配2	级配3	级配4
临界水力梯度	0.01	0.04	0.03	0.02

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表 3 测试结果

Table 3. Test result

级配类型	配比编号	配合比/ (kg·m^-3)				渗透系数/ (cm·s^-1)	有效空隙率/%
级配类型	配比编号	集料	水泥	水	水灰比	渗透系数/ (cm·s^-1)	有效空隙率/%
级配1	1-1	1 668	185	67	0.36	14.56	32.88
级配1	1-2	1 668	167	65	0.39	18.99	33.82
级配2	2-1	1 720	215	77	0.36	3.65	25.20
级配2	2-2	1 720	156	61	0.39	10.25	31.41
级配3	3-1	1 757	220	86	0.39	7.73	28.32
级配3	3-2	1 757	160	58	0.36	17.25	33.50
级配4	4-1	1 782	198	77	0.39	10.73	30.65
级配4	4-2	1 782	178	64	0.36	12.22	29.80

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参考文献(13)

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