Foaming Technology and Rheological Characteristics of Surfactant Additive-Foamed Asphalt

doi:10.12141/j.issn.1000-565X.230121

Abstract

Abstract:

Warm mix asphalt technology can reduce the production and construction temperature of asphalt mixtures, and has great application potential in energy conservation and carbon reduction. The foamed warm mix asphalt technology has the advantage of low cost, but there are some problems such as the unsatisfactory foaming effect of modified asphalt and the insignificant warm mix effect, so it has potential application prospects. Surfactants have the effects of both “asphalt lubricant” and “foam stabilizer”, which makes it possible to improve the foaming characteristics and warm mix effect of foamed warm mixed asphalt. Based on this, this study prepared surfactant additive foamed asphalt (SAFB6, SAFB8, SAF10) with different mass fractions of surfactant additives and foaming temperatures. The foaming test, dynamic shear rheology test and bending beam rheology test were used to investigate foaming properties, high temperature performance, fatigue resistance and low temperature performance. The mechanism was analyzed by Fourier infrared spectroscopy test, and the synergistic effect of both surfactant and foaming process on the performance of foamed warm mix asphalt was revealed. The experimental results show that surfactant additives had a significant synergistic effect on the foaming properties of SBS modified asphalt, especially the half-life, which reached up to 69 s. The best foaming conditions can be achieved when the foaming temperature and surfactant additives content are 170 ℃ and 8%, respectively. No complex chemical reaction occurs during the preparation of SAFB asphalt, but the foaming process resulted in a certain degree of oxidation of SBS modified asphalt. The synergistic effect of the surfactant additives and foaming process improves the high temperature performance and fatigue resistance of the SBS modified asphalt, while the low temperature crack resistance is equivalent to that of SBS modified asphalt. Generally, the combination of surfactant and foaming technology is feasible, which improves the foaming effect and road performance of SBS modified asphalt.

Key words: foamed warm mix asphalt, surfactant additive, foaming behavior, rheological property

CLC Number:

U414

TAO Zhuohui, SHEN Shihui, SUN Yang, et al. Foaming Technology and Rheological Characteristics of Surfactant Additive-Foamed Asphalt[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(3): 41-49.

Figures/Tables 10

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性能	指标范围	测试结果	测试方法
针入度（25 ℃，100 g， 5 s）/10^-1 mm	40~60	54	T 0604—2011
软化点/℃	≥75	89	T 0606—2011
5 ℃延度/cm	≥20	32	T 0605—2011
旋转薄膜烤箱加热（简称RTFOT）老化（163 ℃， 85 min）质量变化/%	≤±1	0.02	T 0609—2011
82 ℃ G*/sinδ/kPa	>2.2	1.75	T 0628—2011

沥青样品ID	制备过程
B	SBS改性沥青
BSA 6	混合SBS改性沥青和表面活性剂水溶液SA（6%）^1），在160 ℃，1 500 r/min下搅拌10 min
BSA 8	合SBS改性沥青和表面活性剂水溶液SA（8%）^1），在160 ℃，1 500 r/min下搅拌10 min
BSA 10	混合SBS改性沥青和表面活性剂水溶液SA（10%）^1），在160 ℃，1 500 r/min下搅拌10 min
SAFB 6	利用发泡机将表面活性剂水溶液SA（6%）^1）注入SBS改性沥青
SAFB 8	利用发泡机将表面活性剂水溶液SA（8%）^1）注入SBS改性沥青
SAFB 10	利用发泡机将表面活性剂水溶液SA（10%）^1）注入SBS改性沥青

发泡剂含量/%	纯水		表面活性剂水溶液
发泡剂含量/%	膨胀率/%	半衰期/s	膨胀率/%	半衰期/s
6	9.0	16	10.0	50
8	11.5	10	12.0	28
10	13.0	8	13.5	17

发泡温度/℃	膨胀率/%			半衰期/s
发泡温度/℃	6%^2）	8%^2）	10%^2）	6%^2）	8%^2）	10%^2）
160	6.5	9.0	12.0	69.0	38.5	17.5
170	10.0	12.0	13.5	50.0	28.0	17.0
180	10.0	12.0	12.5	48.0	22.0	17.0

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