隧道温拌阻燃抑烟沥青混合料技术性能研究

Abstract

With the rapid rise of the Midwest, the construction of the high road has also skyrocketed, and the vast mountain road tunnels have been an important part of the process. Compared with the cement concrete pavement, asphalt pavement with good resistance to sliding, smoothness and noise, and easy in maintenance advantage has been widely applied to tunnel pavement. However, there are some problems in the process of use. Firstly, it is the stage of pavement paving. Since the tunnel environment is relatively closed and narrow, the high temperature of hot mix asphalt mixture and the smoke emission are not easy to dissipate, causing serious damage to the construction personnel and machinery. Second, it is the service phase of the road, and the asphalt is a combustible material, which can be easily triggered by accident in the tunnel, which can pose a serious threat to the life safety of the traffic participants. So, it's important to study the properties of the flame-retardant asphalt mixture.

In this paper, we further improve the formulation of fire retardant agent in the research group, and the optimal blending ratio of the expansion system with the flame retardant and the inorganic compound flame retardant is determined according to the test of the limit oxygen index and the change of asphalt performance. According to the asphalt mixture workability test to determine the distribution of temperature optimal dosage of mixed agent and temperature effect.

The flame retardant mechanism of different kinds of asphalt is conducted by TG test, and the reaction activation energy E of various flame retardant asphalt in the various combustion stages is determined by using the Coats-Redfern model fitting method (CRIM) to characterize the asphalt combustion performance. The results show that the two kinds of flame retardants used in this paper have good flame retardant effect. In the first and third stage of bituminous combustion, the effect of inorganic compound flame retardant is better, and the flame retardant effect is better in the second stage of expansion.

Based on the common asphalt pavement tunnel type AC-13, SMA-13, OGFC-13 three mixture high temperature stability, low temperature crack resistance, water stability, the

reflection crack resistance were studied. The experimental results show that the three types of road asphalt mixture can satisfy the requirements of specification, SMA asphalt pavement is recommended for three grading type mixes only from road performance considerations.

The flame retardant suppression performance of different types of asphalt mixes was evaluated using a CONE test. It was found that that flame retardant effect of the asphalt mixture admixed with the inorganic flame retardant was the most obvious in the combustion prose. the flame retardant effect of the inorganic compound compound flame retardant is superior to that of the expansion system compound flame retardant. In terms of flame retarding performance, SMA is better in suppressing smoke, and OGFC is better in reducing heat release.

It is shown that that temperature mix agent and flame retardant can effectively reduce the emission of exhaust gas, the flame retardant is greatly reduced in cost, and the flame retardant smoke suppression effect is good.

Keywords: Tunnel road, flame-retardant, flame-retardant mechanism, activation energy, road performance, cone , performance review

第一章绪论 (1)

1.1 课题研究背景及意义 (1)

1.2 国内外研究现状 (2)

1.2.1阻燃剂的发展现状 (2)

1.2.2阻燃评价方法研究现状 (5)

1.2.3温拌技术发展现状 (6)

1.3主要研究内容与技术路线 (8)

1.3.1主要研究内容 (8)

1.3.2技术路线 (9)

第二章阻燃温拌沥青的制备及技术性质 (10)

2.1沥青阻燃性能评价方法 (10)

2.2极限氧指数评价标准确定 (12)

2.3阻燃剂复配方案及制备工艺 (13)

2.3.1复配方案 (13)

2.3.2制备工艺 (14)

2.4膨胀型复配阻燃剂对沥青性能的影响 (15)

2.4.1对沥青技术性能的影响 (15)

2.4.2对燃烧性能的影响 (17)

2.4.3总掺量的确定 (19)

2.5无机系复配阻燃剂对沥青性能的影响 (21)

2.5.1无机系阻燃剂可代替矿粉的原因 (21)

2.5.2对沥青技术性能的影响 (22)

2.5.3对燃烧性能的影响 (25)

2.5.4总掺量的确定 (26)

2.6温拌剂种类和掺量的选择 (27)

2.6.1温拌剂种类选择 (27)

2.6.2最佳掺量确定 (29)

2.6.3温拌阻燃剂对沥青燃烧性能的影响 (34)

2.7本章小结 (34)

第三章沥青阻燃效果评价及阻燃机理分析 (36)

3.1引言 (36)

3.2 热失重试验 (36)

3.2.1实验方案 (36)

3.2.2试验结果分析 (37)

3.3活化能参数计算 (40)

3.3.1 Coats–Redfern计算方法 (41)

3.3.2计算结果分析 (42)

3.4阻燃机理分析 (47)

3.4.1膨胀系复配阻燃剂的阻燃机理 (47)

3.4.2无机系复配阻燃剂的阻燃机理 (48)

3.5本章小结 (50)

第四章阻燃温拌沥青混合料性能研究 (51)

4.1引言 (51)

4.2原材料试验 (51)

4.2.1沥青 (51)

4.2.2集料技术性能 (51)

4.2.3矿料级配组成 (54)

4.3阻燃剂、温拌剂的添加方式及温度控制 (57)

4.3.1阻燃剂、温拌剂的添加方式 (57)

4.3.2混合料的拌和及压实温度 (58)

4.4.1 AC-13沥青混合料 (59)

4.4.2 SMA-13沥青混合料 (59)

4.4.3 OGFC-13沥青混合料 (60)

4.5路用性能验证 (60)

4.5.1高温稳定性 (60)

4.5.2低温稳定性 (64)

4.5.3水稳定性 (67)

4.5.4 抗反射裂缝性能 (73)

4.5.5 APA浸水车辙试验 (77)

4.6沥青混合料阻燃抑烟性能评价 (81)

4.6.1CONE试验原理 (81)

4.6.2 CONE试验方法 (82)

4.6.3试验结果及分析 (83)

4.7本章小结 (87)

第五章阻燃温拌沥青混合料社会效益分析 (89)

5.1环境效益评价 (89)

5.1.1温拌技术环境效益 (89)

5.1.2阻燃技术环境效益 (90)

5.2经济性分析 (92)

5.2.1燃料消耗分析 (92)

5.2.2阻燃剂成本分析 (93)

5.3施工效益分析 (94)

5.4综合社会效益分析 (95)

5.5本章小结 (95)

结论与进一步建议 (97)

进一步建议 (98)

参考文献 (100)

致谢 (104)