泡沫沥青冷再生路面破损机理与二次冷再生方法研究

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3.0 侯斌 2024-11-19 4 4 3.82MB 84 页 15积分

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摘要

近年来，泡沫沥青冷再生技术在我国迅速发展，但由于设计、施工、养护管

理等诸多原因，已修建的再生路段开始出现车辙、裂缝、坑槽等损坏现象，早期

修建的泡沫沥青冷再生路面将陆续进入维修改造阶段。本文通过理论研究与现场

调研相结合的方法，分析泡沫沥青冷再生路面主要的病害形式及其成因，针对目

前泡沫沥青冷再生技术在使用过程中存在的问题，进行再生混合料优化设计的研

究。

通过大量现场调查，总结泡沫沥青冷再生路面易出现的病害类型，通过微观

试验及相关理论研究发现，泡沫沥青冷再生混合料在水的浸泡作用下易产生破坏，

且常见的破坏模式有两种，模式一的破坏裂缝出现于泡沫沥青胶结剂与粗骨料颗

粒没有充分粘结的部位；模式二出现的裂缝位于泡沫沥青与细料形成的“玛蹄脂”

部位。为避免这两种常见破坏模式，必须控制泡沫沥青冷再生层施工时的含水量，

待再生层水分完全蒸发，泡沫沥青与集料粘结充分后再铺筑封层或面层，将显著

减少早期辙槽的发生。此外，压路机在压实时部分沥青胶浆会粘附于钢轮，导致

再生层表面出现不平整的坑洼，也为后期出现局部坑槽留下隐患。根据查找的病

因，从材料选用、混合料设计及施工工艺等方面提出了优化措施。

通过室内试验对沥青类铣刨料筛分方法进行研究，对多地铣刨料进行抽提，

并研究抽提前后铣刨料级配的不同，根据这两种级配分别进行混合料设计，测定

两种级配对应的再生混合料性能，发现按照规范中 60℃试验条件，其高温稳定性

能相差不大，而提高环境温度至 70℃时，按照真实级配设计的再生混合料高温稳

定性能明显优于前者，故在进行泡沫沥青冷再生混合料设计时，宜先对沥青类铣

刨料抽提然后筛分，以筛分后级配进行再生混合料设计，将有助于避免虚假颗粒

影响再生混合料的真实级配。

试验室对泡沫沥青冷再生混合料级配范围进行了研究，针对不同交通量的要

求，提出不同的级配范围，对于重载和特重交通参照振动成型法级配范围要求，

不但增加了泡沫沥青冷再生混合料的击实功，还使得混合料形成了骨架密实结构，

这将显著增加泡沫沥青冷再生混合料的高温稳定性能；对于中、轻交通在满足使

用要求的前提下，可以放宽级配的技术要求，减少新掺入材料的比例，以降低工

程造价。

以浙江省S102杭昱线为依托，选用泡沫沥青和水泥分别对泡沫沥青再生混合

料进行二次冷再生设计。研究得出，当采用泡沫沥青进行二次冷再生时，泡沫沥

青基层铣刨料添加量不宜超过60%，通过添加部分沥青面层铣刨料及新的碎石、石

屑，二次再生混合料水稳性及高温稳定性能满足泡沫沥青冷再生基层材料使用要

求。当采用水泥进行二次冷再生时，集料级配控制在骨架密实型级配范围要求，

通过添加4%的水泥，水泥二次再生混合料的无侧限抗压强度能满足水泥稳定类基

层材料使用要求。

以浙江省 S102 杭昱线为依托，进行二次冷再生相关试验及试验路的铺筑，并

确定了相应的施工方案，同时严格控制施工技术中的质量检测与验收要求。二次

再生试验路满足再生路面性能的要求，经一年追踪检测，较好的完成了路用性能

的要求。

关键词：泡沫沥青冷再生混合料破损机理防治对策配合比设计二

次冷再生

ABSTRACT

Recently, the cold recycled technique of foamed asphalt has rapidly developed in

our country. However, some damage phenomenon, such as rut, crack and pit slot,

appeared on the recycled roads. Foam asphalt cold recycled roads built in early stage

will gradually step into the maintenance and reconstruction stage. Through theory

research and site survey, this paper will analyze the main disease form and its factors of

foam asphalt cold recycled roads. In allusion to the questions existing in the usage

progress of foam asphalt cold recycled technique, the research on recycled mixture

optimal design will also be conducted.

First, through a great deal of site surveys, the disease forms of foam asphalt cold

recycled roads are summarized. Micro-tests and relative theory researches show that

foam asphalt cold recycled mixture is easy to be damaged if it soaks in cold water.

There are two common failure modes, the mode of destruction of a crack appears

between the foamed asphalt cement and aggregate particles which are not fully

integrated; the other crack pattern emerged located at the "mastic" part that foam

bitumen and fine material. To avoid these two common failure modes, the water content

of foamed bitumen cold recycling layer should be controlled during the construction,

until the water has completely evaporated. After foamed bitumen and aggregate bond

fully can be paved and early rut slot occurred will be significantly reduced. In addition,

when the press roller press asphalt mortar, part of the asphalt mortar will adhere to the

drum, resulting in that regeneration of the surface layer of has uneven potholes, also

leave the possibility of appearing local pits in the future. According to the cause, we

should take optimization measures such as material selection, mix design, construction

technology.

Through laboratory experiments, milling material of many places is extracted ,the

differences between before they are extracted and after, according to the two gradation，

the mixture design is conducted and the respective regeneration mixture performance of

the two gradation are tested. The result shows that the high-temperature stability of

milling materials in many places has no obvious changes at 60℃. However, when the

temperature is raised to 70℃, the high-temperature stability of recycled mixtures which

is designed on the base of real gradation is obviously better than the former. Therefore,

when being conducted the recycled mixtures design, asphalt pavement milling material

should be firstly extracted and then sieved so that the real gradation of recycled

mixtures won’t be affected by false particles.

The scope of gradation of foamed recycled mixtures is researched in the laboratory.

Aiming at requirements of different traffic volume, various scopes of gradation are

raised. As for heavy and extra heavy traffic, vibration formation method should be

adopted to form dense framework and increase the compaction work of mixtures, and

the mixture have become skeleton dense texture, which can obviously improved the

high temperature stability of foamed asphalt recycled mixtures. On the light traffic, if

the operating requirements are satisfied, the technical requirements of gradation can be

broaden. In order to reduce the building cost of projects, the proportion of new materials

is allowed to be reduced.

In this paper, based on S102 highway in Zhejiang province, foamed bitumen and

cement are respectively chosen to design the secondary foam asphalt cold recycling

mixtures. Studies concluded at when foamed bitumen is used to design secondary cold

recycling mixture, the amount of foam milling asphalt base material added should not

exceed 60%, by adding section milling asphalt surface materials and new gravel, stone

chips, water stability and high temperature stability of secondary recycled mixture can

meet the performance requirements of foamed bitumen cold recycling mixes. When

cement is adopted in secondary cold recycling, gradation is in the charge of the

requirement of dense framework, by adding 4% of cement, the unconfined compressive

strength of secondary regeneration mix can meet the requiremen of the cement

stabilized base material.

On the base of S102 highway in Zhejiang province, the relative experiment of

secondary cold recycling has been conducted and the test road has been paved. At last

the corresponding construction programs are determined and at the same time quality

testing and inspection requirements are strictly controled in construction techniques.

Secondary regeneration test road pavement performance has met the requirements of

regeneration, by one year’s track test, the road performance requirements are well

completely.

Key words: cold regeneration mixture with foamed bitumen，damage

mechanisms，prevention and control measures，mix proportion design，

secondary cold recycling

中文摘要

ABSTRACT

第一章绪论 ................................................................................................................ 1

1.1 泡沫沥青冷再生技术背景 ............................................................................... 1

1.2 国内外研究与应用现状 ................................................................................... 3

1.2.1 国外研究与应用现状 ................................................................................ 3

1.2.2 国内研究与应用现状 ................................................................................ 4

1.3 课题的研究意义与必要性 ............................................................................... 7

1.4 课题研究的主要内容和技术路线 ................................................................... 8

1.4.1 研究内容 .................................................................................................... 8

1.4.2 技术路线 .................................................................................................... 8

第二章泡沫沥青冷再生路面破损机理与防治对策研究 ...................................... 10

2.1 泡沫沥青冷再生路面病害调查 ..................................................................... 10

2.2 泡沫沥青冷再生路面病害机理分析 ............................................................. 12

2.2.1 再生混合料破坏形式 .............................................................................. 12

2.2.2 车辙 .......................................................................................................... 14

2.2.3 坑槽及松散 .............................................................................................. 16

2.2.4 横向裂缝 .................................................................................................. 18

2.3 本章小结 ......................................................................................................... 19

第三章泡沫沥青冷再生混合料配合比设计与施工工艺优化研究 ...................... 20

3.1 泡沫沥青冷再生材料选用 ............................................................................. 20

3.1.1 沥青发泡 .................................................................................................. 20

3.1.2 集料 .......................................................................................................... 21

3.1.3 铣刨料 ...................................................................................................... 22

3.2 铣刨料筛分方法优化 ..................................................................................... 23

3.3 设计优化 ......................................................................................................... 27

3.3.1 最大干密度与最佳含水量 ...................................................................... 27

3.3.2 泡沫沥青再生混合料技术指标 .............................................................. 28

3.3.3 设计优化试验 .......................................................................................... 30

3.4 施工工艺优化 ................................................................................................. 35

3.5 本章小结 ......................................................................................................... 36

第四章二次冷再生混合料设计方法的试验研究 .................................................. 37

4.1 稳定剂的选择 ................................................................................................. 37

4.2 泡沫沥青作稳定剂二次冷再生混合料设计 ................................................. 37

4.2.1 沥青发泡原理 .......................................................................................... 37

4.2.2 沥青发泡特性评价指标 .......................................................................... 38

4.2.3 泡沫沥青二次冷再生混合料级配设计 .................................................. 38

4.2.4 最佳拌和用水量 ...................................................................................... 40

4.2.5 沥青发泡与试件成型 .............................................................................. 40

4.2.6 试验结果分析 .......................................................................................... 41

4.3 水泥作稳定剂二次冷再生设计 ..................................................................... 43

4.3.1 水泥作稳定剂二次冷再生级配设计 ...................................................... 43

4.3.2 最佳含水量与最大干密度确定 .............................................................. 45

4.3.3 无侧限抗压强度试验 .............................................................................. 46

4.3.4 其它力学性能试验 .................................................................................. 47

4.4 本章小结 ......................................................................................................... 49

第五章二次再生试验路前期路况调查分析 .......................................................... 51

5.1 旧冷再生路面状况调查 ................................................................................. 51

5.1.1 旧路概况 .................................................................................................. 51

5.1.2 路面状况调查 .......................................................................................... 51

5.1.3 路面病害调查 .......................................................................................... 53

5.2 泡沫沥青冷再生试验路段病害成因分析 ..................................................... 55

5.2.1 旧冷再生路面车辙 .................................................................................. 55

5.2.2 旧冷再生路面水损坏 .............................................................................. 55

5.3 本章小结 ......................................................................................................... 57

第六章二次再生试验路工程应用 .......................................................................... 58

6.1 二次再生施工工艺与质量控制 ..................................................................... 58

6.1.1 二次再生就地冷再生施工工艺 .............................................................. 58

6.1.2 二次再生厂拌冷再生施工工艺 .............................................................. 61

6.2 厂拌二次冷再生试验路铺筑 ......................................................................... 63

6.2.1 泡沫沥青二次冷再生试验路 .................................................................. 63

6.2.2 水泥二次冷再生试验路 .......................................................................... 67

6.3 二次冷再生试验路现状调查 ......................................................................... 69

6.4 经济社会效益分析 ......................................................................................... 70

6.5 本章小结 ......................................................................................................... 71

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摘要：

摘要近年来，泡沫沥青冷再生技术在我国迅速发展，但由于设计、施工、养护管理等诸多原因，已修建的再生路段开始出现车辙、裂缝、坑槽等损坏现象，早期修建的泡沫沥青冷再生路面将陆续进入维修改造阶段。本文通过理论研究与现场调研相结合的方法，分析泡沫沥青冷再生路面主要的病害形式及其成因，针对目前泡沫沥青冷再生技术在使用过程中存在的问题，进行再生混合料优化设计的研究。通过大量现场调查，总结泡沫沥青冷再生路面易出现的病害类型，通过微观试验及相关理论研究发现，泡沫沥青冷再生混合料在水的浸泡作用下易产生破坏，且常见的破坏模式有两种，模式一的破坏裂缝出现于泡沫沥青胶结剂与粗骨料颗粒没有充分粘结的部位；模式二出现的裂缝...

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