蔗渣纤维表面改性及其沥青混合料路用性能

doi:10.13229/j.cnki.jdxbgxb.20220870

Abstract

Abstract:

In order to improve the road performance of bagasse fiber asphalt mixture， one-step modification method （alkali， silane， acetic anhydride） and two-step modification method （alkali plus silane， alkali plus acetic anhydride） were used to treat the surface of bagasse fiber， and the basic properties of the fibers were tested according to the specifications. Following that， the structural changes of bagasse fibers before and after modification were studied by infrared spectroscopy and scanning electron microscopy. In addition， the thermal degradation properties were investigated by the thermogravimetric analyzer. And SMA-13 asphalt mixture with bagasse fiber was designed and its road performances were evaluated according to the specifications. The results showed that the oil absorption rates of modified fibers increased by over 10.9% compared to original fiber. Alkali， silane， and acetic anhydride could reduce the polarity of fiber surface molecules. Furthermore， the alkali and silane in two-step modification method could remove most effectively amorphous components in bagasse fiber， improving the hydrophobicity of the fiber surface and the interfacial compatibility between fiber and asphalt components. For modified bagasse fibers， the pyrolysis temperature rose up， while the pyrolysis rate slowed down. The dynamic stability， low temperature flexural strains， residual stability indexes in immersing Marshall tests and splitting strength ratio indexes in freeze-thaw tests for asphalt mixtures with the modified bagasse fibers could be increased by a maximum of 15.0%， 12.6%， 7.5% and 7.0%， respectively. Overall， among the five modification methods， the alkali plus silane in two-step modification showed the best modification effect.

Key words: road and railway engineering, asphalt mixture, bagasse fiber, surface modification, road performance

CLC Number:

U414

Zu-zhong LI,Meng-yuan LI,Wei-dong LIU,Xiao-xiao PANG,Hao Tang,Xue-lei ZHANG,Chen-yang MA. Surface modification of bagasse fibers and road performances of asphalt mixture[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(6): 1738-1745.

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名称	化学式	形态	沸点/℃	自燃温度/℃	密度/（g·mL^-1）
乙烯基三甲氧基硅烷	C₅H₁₂O₃SI	无色透明液体	123	235	0.96~0.98
乙酸酐	C₄H₆O₃	无色透明液体	140	49	1.08

技术指标	原样	技术要求
针入度（25 ℃， 100 g， 5 s）/mm	67.2	60~80
软化点/℃	69.0	≥55
延度（5 ℃， 5 cm/min）/cm	38.9	≥30
运动黏度（135 ℃）/Pa·s	1.754	≤3
残留物质量损失/%	0.8	±1.0
残留物针入度比/%	85	≥65
残留物延度（5 ℃， 5 cm/min）/cm	34.5	≥30

技术指标	试验值		技术要求
技术指标	5~10 mm	10~15 mm	技术要求
表观相对密度	2.854	2.796	≥2.60
吸水率/%	1.02	0.84	<2.0
<0.075颗粒含量/%	0.6	0.4	<1
针片状颗粒含量/%	4.4	5.1	<15
洛杉矶磨耗损失/%	11.4		<28
压碎值/%	9.7		≤26

技术指标	试验值	技术要求
表观相对密度	2.715	≥2.50
含水量/%	0.2	≤1

纤维种类	吸油倍数/倍	质量损失/%	灰分含量/%	含水率/%
技术要求	5~9	≤6	13~23	≤5
OL-BF	6.4	6.8	18.3	6.4
AL-BF	8.6	5.3	15.0	4.2
SS-BF	7.3	5.1	15.8	3.3
AA-BF	7.1	5.5	16.9	4.8
ASS-BF	8.7	5.8	13.2	2.2
AAA-BF	8.2	5.9	14.7	3.0

Surface modification of bagasse fibers and road performances of asphalt mixture

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