公路半刚性基层再生利用关键技术研究

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摘要

采用水泥作为稳定剂，通过再生设备对旧半刚性基层材料进行现场再生利用

是一项近年来较常用的道路维修技术，本文围绕工程实践中存在的若干关键技术

问题，开展了室内试验和工程应用研究。

首先选取不同来源的旧半刚性基层材料对其各项性能及其水泥再生后的强

度进行系统的试验分析，并与新骨料和公路沥青路面再生技术规范标准进行比较，

评价其再生可能性及适用性，发现旧半刚性基层材料经铣刨后，由于部分粗骨料

破碎，使得集料级配更加连续，且满足传统悬浮密实型级配范围的要求。虽然经

化学分析发现基层铣刨料中结合料残留的活性已基本丧失且旧料中骨料的吸水

率高于新骨料，但铣刨料中的粗骨料压碎值仍满足规范要求，且旧半刚性基层材

料水泥再生后混合料的无侧限抗压强度满足规范中各等级公路底基层的强度要

求。

其次从旧沥青混凝土掺量和混合料级配对水泥再生混合料关键路用性能的

影响进行了分析评价。一方面，基于旧沥青混凝土掺量和老化程度的不同，水泥

再生混合料表现出以下规律：当沥青老化不严重时，掺入较高含量的旧沥青混凝

土会降低再生材料各龄期的抗压强度、劈裂强度、回弹模量和水稳定性；相反，

掺入较高含量的旧沥青混凝土会适当改善再生材料的干缩性能。另一方面，基于

混合料级配的不同，水泥再生混合料表现出以下规律：旧半刚性基层材料级配通

过添加碎石后，级配得到了改善，形成骨架密实型结构，会增大材料的整体密实

度，降低最佳含水量，显著增加混合料的抗压强度、劈裂强度和抗压回弹模量，

改善混合料的水稳定性和抗干缩性能。最后依据再生材料组成的不同，首次提出

了水泥再生半刚性基层材料的应用条件与场合。

根据前文的室内试验研究和以往工程经验，结合就地冷再生技术和厂拌冷再

生技术的特点，提出了水泥再生混合料的设计方法，强调了旧路面材料的具体取

样方法、原材料分析、级配设计和成型方法。最后根据水泥再生半刚性基层技术

在依托工程中的具体应用，介绍了水泥就地及厂拌冷再生技术的工程应用情况，

归纳了水泥就地及厂拌冷再生技术合理的施工技术方法。

关键词：旧半刚性基层材料水泥再生混合料旧沥青混凝土级配就

地冷再生厂拌冷再生工程应用

Abstract

Using cement as stabilized agent, the method which the old semi-rigid base

materials are recycled with the in-place recycler is a frequently-used technology in

recent years. Laboratory tests and application researchs are developed in order to solve

some key technical problems exist during the engineering practice in this paper.

Firstly, old semi-rigid base materials extracted from different sources are selected

to make a systematic analysis of raw material performances and the strength of recycled

materials through test, and compare with the natural gravel and normative

standards(Technical specification of highway asphalt pavement regeneration) to

evaluate the possibility and applicability of recycling. Result shows the old semi-rigid

material after milling, parts of the coarse aggregates have been broken, the aggregate

gradation is continuous and meets the requirements of the traditional suspension dense

gradation range. Although, residual activity of aggregate in base milling material has

been basically lost and the aggregate bibulous rate of old material is higher than the new

aggregate bibulous rate. But the crushing value of milling material still meets the

regulatory requirements and the strength of recycled materials meets the specifications

of each grade highway subbase strength requirements.

Secondly, analysing and evaluating the influence on the key performance of

cement recycled mixture from admixture content of the old asphalt concrete and mixture

graduation. Based on the different content and the aging degree of old asphalt concrete,

the following rules are found. When the asphalt is not aged seriously, the mix with

higher concentration of old asphalt concrete can lower the compressive strength,

indirect tensile strength, modulus of resilience and water stabilization of recycled

material in each curing period. On the contrary, drying plastic shrinkage of recycled

material is improved appropriately as well. Based on the differences of the mixture

gradation, the folloing rules are found. It shows that adding coarse aggregates to the old

semi-rigid base materials, the gradation can be improved and the type of dense skeleton

can be formed, overall the density is increased, the best moisture content is reduced, the

compressive strength, indirect tensile strength, and compressive modulus of resilience

of the mix are increased significantly, besides, the water stabilization and drying plastic

shrinkage can also be improved. Then, the application conditions and situations are

proposed according to the different composition of recycled materials.

According to the former indoor experimental research and previous engineering

experience, combing the characteristics of cold in-place recycling technology and cold

in-plant recycling technology, the design method of cold recycled mixture with cement

is put forward. The specific sampling methods, analysis of raw materials, grading

design and forming method for the old pavement material are emphasized. In

accordance with the application of the semi-rigid base cold recycled with cement in

supported project, introducing the engineering applications of cold in-place recycling

and cold in-plant recycling technology, the reasonable construction technology for

applying cold in-place recycling technology and cold in-plant recycling is summarized.

Keywords: old semi-rigid base materials, cement recycled mixture，old

asphalt concrete, gradation, cold in-place recycling, cold in-plant

recycling, engineering application

中文摘要

ABSTRACT

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

1.1 研究背景 ............................................................................................................... 1

1.2 国内外研究现状 ................................................................................................... 2

1.2.1 国外研究现状 ................................................................................................. 2

1.2.2 国内研究现状 ................................................................................................. 2

1.3 水泥再生技术在浙江省国省道干线公路适应性分析 ....................................... 4

1.4 主要研究内容 ........................................................................................................ 4

第二章旧半刚性基层材料性能研究 ............................................................................ 6

2.1 旧半刚性基层材料表观分析 ............................................................................... 6

2.2 旧半刚性基层材料级配特性 ............................................................................... 6

2.3 旧半刚性基层材料活性 ....................................................................................... 8

2.4 旧半刚性基层材料骨料强度 ............................................................................... 9

2.5 旧半刚性基层材料吸水率 ................................................................................... 9

2.6 旧半刚性基层材料再生后适用性评价 ............................................................. 10

2.6.1 确定最佳含水量及最大干密度 ................................................................... 10

2.6.2 适用性评价 ................................................................................................... 11

2.7 本章小结 ........................................................................................................... 11

第三章水泥再生混合料性能特性的试验研究 .......................................................... 13

3.1 旧沥青面层材料的掺入对水泥再生混合料性能影响研究 ............................. 13

3.1.1 原材料 ........................................................................................................... 13

3.1.2 材料组合方案 ............................................................................................... 15

3.1.3 抗压强度 ....................................................................................................... 16

3.1.4 劈裂强度（间接弯拉强度） ....................................................................... 19

3.1.5 刚度（抗压回弹模量） ............................................................................... 20

3.1.6 水稳定性能 ................................................................................................... 22

3.1.7 抗干燥收缩性能 ........................................................................................... 24

3.2 水泥再生旧半刚性基层材料性能研究 ............................................................. 25

3.2.1 原材料 ........................................................................................................... 25

3.2.2 材料组合方案 ............................................................................................... 27

3.2.3 最佳含水量和最大干密度 ........................................................................... 28

3.2.4 抗压强度 ....................................................................................................... 29

3.2.5 劈裂强度（间接弯拉强度） ....................................................................... 31

3.2.6 刚度（抗压回弹模量） ............................................................................... 32

3.2.7 水稳定性能 ................................................................................................... 33

3.2.8 抗干燥收缩性能 ........................................................................................... 34

3.3 应用条件与场合 ................................................................................................. 36

3.4 本章小结 ............................................................................................................. 37

第四章水泥再生混合料设计方法研究 ...................................................................... 39

4.1 原材料 ................................................................................................................. 39

4.1.1 旧路面材料 ................................................................................................... 39

4.1.2 水泥 ............................................................................................................... 40

4.1.3 新集料 ........................................................................................................... 40

4.1.4 水 ................................................................................................................... 41

4.2 级配设计 ............................................................................................................. 41

4.3 确定最大干密度和最佳含水量 ......................................................................... 42

4.4 成型方法 ............................................................................................................. 42

4.5 养生与无侧限抗压强度试验方法 ..................................................................... 43

4.6 控制指标与水泥用量的确定 ............................................................................. 43

4.7 干缩、劈裂强度 ................................................................................................. 43

4.8 浙江省部分工程水泥再生混合料配合比设计结果 ......................................... 44

4.9 本章小结 ............................................................................................................. 44

第五章水泥再生工程应用研究 .................................................................................. 46

5.1 水泥就地冷再生半刚性基层技术在 G330 国道建德段的应用 ....................... 46

5.1.1 工程慨况 ....................................................................................................... 46

5.1.2 老路状况 ....................................................................................................... 46

5.1.3 维修方案 ....................................................................................................... 47

5.1.4 施工准备 ....................................................................................................... 48

5.1.5 试验路段 ....................................................................................................... 48

5.1.6 施工情况 ....................................................................................................... 50

5.1.7 观测和分析 ................................................................................................... 52

5.1.8 项目的经济和社会效益分析 ....................................................................... 53

5.2 2013 年缙云县 S219 路面大中修工程应用简况 ............................................ 55

5.2.1 路面结构 ....................................................................................................... 55

5.2.2 工程总结 ....................................................................................................... 55

5.3 2013 年S229（龙后线）公路路面大中修工程应用简况 ............................. 56

5.3.1 工程概述 ....................................................................................................... 56

5.3.2 就地冷再生基层方案 ................................................................................... 56

5.3.3 工程总结 ....................................................................................................... 57

5.4 水泥厂拌冷再生半刚性基层技术在甬余线江北段的应用 ............................. 57

5.4.1 工程慨况 ....................................................................................................... 57

5.4.2 老路状况 ....................................................................................................... 58

5.4.3 维修方案 ....................................................................................................... 58

5.4.4 施工准备 ....................................................................................................... 58

5.4.5 试验路段 ....................................................................................................... 59

5.4.6 施工情况 ....................................................................................................... 60

5.4.7 项目的经济和社会效益分析 ....................................................................... 62

5.5 本章小结 ............................................................................................................. 64

第六章结论与展望 ...................................................................................................... 66

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