Preparation and properties of waste glass⁃fiber⁃reinforced plastic⁃modified asphalt

doi:10.19491/j.issn.1001-9278.2022.08.020

Abstract

Abstract:

To improve the utilization rate of waste glass?fiber?reinforced plastic （GFRP） pipe， the effects of particle size， dosage， and shear conditions， such as temperature， time and rate， of waste GFRP powders on the ductility， penetration， and softening point of modified asphalt were investigated. The microstructure of modified asphalt was analyzed using polarizing microscope and infrared spectroscopy. The results indicated that the thermosetting resin in waste GFRP could react with asphalt to produce naphthenic hydrocarbons and aliphatic hydrocarbons. The increase of aliphatic hydrocarbon content increased the ductility of asphalt， and the excessive content of waste GFRP increased the formation of naphthenic hydrocarbons. This was disadvantageous to the improvement of asphalt ductility. Meanwhile， glass fiber reduced the penetration of asphalt and improved its high?temperature stability. If the content of glass fiber was too high， more defects were formed at an over high content of glass fiber， resulting in a decrease in ductility. This was disadvantageous to the improvement of asphalt hardness. In addition， a too low or too high shear temperature resulted in an increase in the content of naphthenic hydrocarbons in the modified asphalt. This was disadvantageous to the improvement of asphalt ductility. However， the influence of shear temperature on the high temperature stability of the modified asphalt was not obvious. Moreover， when the shear rate reached a certain value， an increase in shear rate generated few effects on the performance of the modified asphalt， and the increase of shear time was beneficial to an improvement in its performance. The optimal modification system was determined to be a particle size smaller than 0.3 mm， a dosage of 4 %， a modification temperature of 150 °C， a shear time of 4 h， and a shear rate of 8 000 r/min.

Key words: waste glass fiber reinforced plastic, matrix asphalt, shearing system, microstructure, performance

CLC Number:

TQ327.1⁺1

HU Chenguang, SU Hang, FENG Xiaoxin, DING Feng, LI Enshuo, FU Jiawei. Preparation and properties of waste glass⁃fiber⁃reinforced plastic⁃modified asphalt[J]. China Plastics, 2022, 36(8): 119-126.

Figures/Tables 11

References 16

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样品名称	GFRP 掺量/%	剪切温度/℃	剪切机转速/ r·min^-1	剪切时间/h	粒径/ mm
LJ1	6	140	5 000	1	<0.075
CL1	4	140	5 000	1	<0.3
CL2	5	140	5 000	1	<0.3
CL3	6	140	5 000	1	<0.3
CL4	7	140	5 000	1	<0.3
WD1	4	130	5 000	1	<0.3
WD2	4	150	5 000	1	<0.3
WD3	4	160	5 000	1	<0.3
WD4	4	170	5 000	1	<0.3
SD1	4	150	8 000	1	<0.3
SD2	4	150	10 000	1	<0.3
SJ1	4	150	5 000	2	<0.3
SJ2	4	150	5 000	4	<0.3

样品名称	GFRP 掺量/%	剪切温度/℃	剪切机转速/ r·min^-1	剪切时间/h	粒径/ mm
LJ1	6	140	5 000	1	<0.075
CL1	4	140	5 000	1	<0.3
CL2	5	140	5 000	1	<0.3
CL3	6	140	5 000	1	<0.3
CL4	7	140	5 000	1	<0.3
WD1	4	130	5 000	1	<0.3
WD2	4	150	5 000	1	<0.3
WD3	4	160	5 000	1	<0.3
WD4	4	170	5 000	1	<0.3
SD1	4	150	8 000	1	<0.3
SD2	4	150	10 000	1	<0.3
SJ1	4	150	5 000	2	<0.3
SJ2	4	150	5 000	4	<0.3

样品	LJ1	CL3
粒径/mm	<0.075	<0.3
25 ℃平均延度/cm	78.2	79.3
平均针入度/0.1 mm	38.3	38.6
平均软化点/℃	53.2	53.4

样品	LJ1	CL3
粒径/mm	<0.075	<0.3
25 ℃平均延度/cm	78.2	79.3
平均针入度/0.1 mm	38.3	38.6
平均软化点/℃	53.2	53.4

样品	WD2	SD1	SD2	SJ1	SJ2
剪切机转速/r·min^-1	5 000	8 000	10 000	5 000	5 000
时间/h	1	1	1	2	4
平均25 ℃延度/cm	99.6	100.9	100.3	103.0	110.3
平均针入度/0.1 mm	39.9	39.3	39.2	38.3	38.2
平均软化点/℃	54.2	54.1	54.3	53.9	54.0