布敦岩沥青无机粉粒微观特征及改性机理

吴怀睿; 叶奋; 徐骁龙

doi:10.3969/j.issn.0258-2724.20180582

布敦岩沥青无机粉粒微观特征及改性机理

doi: 10.3969/j.issn.0258-2724.20180582

吴怀睿^1,,
叶奋^1,2, ,,
徐骁龙³

基金项目: 国家自然科学基金（No：51568064）、新疆天山学者讲座教授项目（编号：111001/45042）

详细信息

作者简介:
吴怀睿（1986—），男，博士研究生，研究方向为道路工程材料，E-mail：wuhuairui@126.com

通讯作者:
叶奋（1970—），男，教授，研究方向为道路工程，E-mail：yefen@tongji.edu.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2018-07-11
- 修回日期: 2018-08-03
- 网络出版日期: 2019-02-23
- 刊出日期: 2019-06-01

Microstructural Characteristics and Modification Mechanism of Inorganic Fine Particles in Buton Rock Asphalt

WU Huairui^1
,,
YE Fen^{1,2
, ,},
XU Xiaolong³

摘要

摘要: 为了研究布敦岩沥青（Buton rock asphalt，BRA）中天然无机粉粒在沥青混合料改性过程中的作用，对布敦岩沥青中天然无机粉粒的特性和改性效果进行了分析. 利用X射线衍射（X-ray diffraction，XRD）、扫描电子显微镜（scanning electron microscopy，SEM）测定了无机粉粒的X射线衍射谱和微观图像；通过K值法和灰度图像处理，分析了布敦岩沥青中的天然无机粉粒的矿物组分、微观特征及其形成机制；采用动态剪切流变试验和混合料性能试验，测定了天然粉粒对胶浆和混合料性能的影响. 结果表明：布敦岩沥青中天然无机粉粒含有约85%的碳酸岩，主要由古海洋生物残骸形成；其余约15%成分为石英、云母和石膏，比例约为7∶6∶1，颗粒表面覆盖的层状和片状晶体构成的微观粗糙构造的面积可达80%以上；原始微观形貌特征和有机胶结料对粉粒微观构造的填充状态是影响天然粉粒改性效果的主要因素，以天然无机粉粒取代机制矿粉使沥青胶浆车辙因子最多提高0.524 kPa，动稳定度提高18.8%，冻融劈裂强度提高5.1%，冻融劈裂强度比提高至83.5%以上；复合改性时，天然无机粉粒能够作为助剂改善沥青质改性胶结料和沥青混合料的性能. 当采用天然沥青质改性时，无机粉粒使沥青胶浆车辙因子提高0.674～0.910 kPa，动稳定度提高21.1%～25.6%，冻融劈裂强度提高3.5%～5.6%，冻融劈裂强度比由85%提高至90%以上.
- 布敦岩沥青 /
- 天然无机粉粒 /
- 矿物组成 /
- 微观结构 /
- 改性机理
Abstract: The properties of natural inorganic fine particles in Buton rock asphalt (BRA) and the effects of asphalt modification on these particles were analyzed in order to study the role of the natural inorganic fine particles in the process of asphalt mixture modification. First, X-ray diffraction (XRD) patterns and microscopic images of the inorganic fine particles were obtained using X-ray diffraction and scanning electron microscopy (SEM). Secondly, the mineral composition, microscopic characteristics, and mechanism of the formation of the natural inorganic fine particles in BRA were analyzed through the K value method and grayscale image processing. Finally, the effects of the inorganic particles on the performances of mastic and asphalt mixtures were determined using the dynamic shear rheological test (DSR) and mixture performance tests. The results show that the natural inorganic fine particles in BRA contain approximately 85% carbonatite, which is mainly formed from the remains of ancient halobios and partially retained the primary structure. The content of non–carbonate inorganic minerals reaches 15%, of which the proportions of quartz, muscovite, and gypsum are approximately 7:6:1. The surface area of the particles covered by micro-rough structures composed of layered and tabular crystals can reach more than 80%. The preservation of the original microstructural characteristics, recovery, and the enhancement of the organic binder filling state of the microstructure are the main factors responsible for the modification effect of the natural particles. The partial substitution of artificial mineral particles by natural inorganic fine particles can increase the rutting factor of the asphalt mastic, dynamic stability, and freeze-thaw tensile strength by 0.524 kPa, 18.8%, and 5.1% respectively, and the tensile strength ratio can increase to more than 83.5%. The use of natural inorganic fine particles as an aid in compound modifiers improves the performance of the mastic and asphalt mixtures. When the mastic or mixture is modified with natural asphaltene, the natural inorganic fine particles increase the rutting factor of the asphalt mastic, dynamic stability, and freeze-thaw tensile strength by 0.674–0.910 kPa, 21.1%–25.6%, and 3.5%–5.6% respectively, and the tensile strength ratio increases from 85% to more than 90%.
- Buton rock asphalt /
- natural inorganic fine particles /
- mineral composition /
- microstructure /
- modification mechanism

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图 1 X射线衍射谱

Figure 1. X-ray diffraction （XRD） patterns

下载: 全尺寸图片幻灯片

图 2 天然粉粒微观形貌

Figure 2. Microstructure of the natural fine particles

下载: 全尺寸图片幻灯片

图 3 矿粉微观形貌

Figure 3. Microstructure of the artificial filler particles

下载: 全尺寸图片幻灯片

图 4 颗粒灰度和结构

Figure 4. Image grayscale value and the structure of the particles

下载: 全尺寸图片幻灯片

图 5 车辙因子G*·sin^–1δ和相位角δ

Figure 5. Rutting factor G*·sin^–1δ and phase angle δ

下载: 全尺寸图片幻灯片

图 6 混合料动稳定度V_DS

Figure 6. Dynamic stability V_DS of the mixtures

下载: 全尺寸图片幻灯片

图 7 劈裂强度σ_s和冻融劈裂残余强度比R_TSR

Figure 7. Splitting strength σ_s and tensile strength ratio R_TSR

下载: 全尺寸图片幻灯片

表 1 无机颗粒粒度分布

Table 1. Size distribution of the inorganic particles

无机颗粒材料	筛孔尺寸/mm
无机颗粒材料	16.000	13.200	9.500	4.750	2.360	1.180	0.600	0.300	0.150	0.075
天然粉粒							100.0	100.0	96.0	86.3
人工磨细矿粉							100.0	99.8	92.8	78.9
沥青混合料中的无机颗粒（级配）	100.0	95.0	75.0	49.0	26.1	19.2	14.9	10.3	7.4	5.2

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表 2 无机颗粒化学组成

Table 2. Chemical composition of the inorganic particles

材料	CaO	SiO₂	MgO	Al₂O₃	Fe₂O₃	SO₃	TiO₂	K₂O	Na₂O	P₂O₅
天然粉粒	44.69	9.23	3.53	1.57	0.26	0.58	0.15	0.47	0.12	0.07
人工磨细矿粉	50.71	3.52	5.80	0.21	0.15	0.01	0.01		0.02	0.02

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表 3 沥青混合料中沥青胶浆的配比

Table 3. Compositions of asphalt mastic in mixture

沥青混合料	沥青胶浆	矿粉	天然粉粒	EBRA	BRA	沥青
MA	AMA	100.0				100.0
MB	AMB	69.2			40.0	90.8
ME	AME	100.0		9.2		90.8
MHD	AMH	69.2	30.8			100.0
MHW	AMH	69.2	30.8			100.0
MHED	AMHE	69.2	30.8	9.2		90.8
MHEW	AMHE	69.2	30.8	9.2		90.8

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表 4 预拌胶浆配比

Table 4. Compositions of premixed mastic

预拌沥青胶浆	矿粉	天然粉粒	EBRA	BRA	沥青
AMA	30.8				100.0
AMB				40.0	90.8
AME			9.2		90.8
AMAE	30.8		9.2		90.8
AMH		30.8			90.8
AMHE		30.8	9.2		90.8

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表 5 无机颗粒（X射线衍射分析）的矿物组成

Table 5. Mineralogical composition of inorganic particles（based on XRD）

矿物名称	K值	天然粉粒		人工磨细矿粉
矿物名称	K值	晶格间距/Å	w_B%	晶格间距/Å	w_B%
方解石	3.21	3.043	82.60	3.039	85.39
石英	2.93	3.355	7.03	3.350	4.01
白云岩1	2.35	2.916	3.70
白云岩2	2.47			2.889	8.30
透辉石	1.19			2.994	2.30
云母	0.39	10.130	5.99
硫酸钙-石膏	3.42	6.021	0.69
注：云母的元素组合为Al∶Ca∶Fe∶H∶K∶Mg∶Na∶O∶Si∶Ti = 275∶1.1∶3.2∶200∶72.7∶2.2∶17∶1200∶312.8∶2

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