Study on thermal stability of asphalt modified with styrene butadiene styrene/nano calcium carbonate composite

doi:10.19491/j.issn.1001-9278.2023.08.007

Abstract

Abstract:

To determine the thermal stability of styrene⁃butadiene⁃styrene block copolymer （SBS）/nano⁃calcium carbonate composite⁃modified asphalt， the stability mechanism and qualitative judgment method were studied by using infrared spectroscopy， fluorescence microscopy， and material surface interface chemistry theory. Through using a softening point correlation method and an infrared spectroscopy technology correlation method， the regression models of softening point， SBS characteristic peak area， and modifier content were fitted， and a data model for softening point and SBS characteristic peak area was established. The results indicated that nano⁃calcium carbonate improved the thermal stability of SBS⁃modified asphalt through a physical action. The stability of the system was good a softening point difference ≤ 2.5 ℃， a SBS content difference ≤ 0.34 %， and a CaCO₃content difference ≤ 0.15 %. The infrared spectral correlation method revealed the internal factors of the system stability. The system was stable when the difference of characteristic peak area at 966 cm^-1 was less than 0.24 and the softening point difference was less than 2.5 °C. The regression results indicated that the data model of softening point and SBS characteristic peak area established by this study was statistically significant， which could construct a new evaluation system for the study of the thermal stability of SBS/nanomaterials composite⁃modified asphalt.

Key words: styrene?butadiene?styrene block copolymer modifier, nano calcium carbonate, modified asphalt, thermal stability

CLC Number:

TQ316.6

YANG Xiying, CHEN Meng, ZHANG Wencai, PEI Qiang. Study on thermal stability of asphalt modified with styrene butadiene styrene/nano calcium carbonate composite[J]. China Plastics, 2023, 37(8): 45-54.

Figures/Tables 14

项目	技术要求	试验结果	试验方法
针入度（25 ℃，5 s，100 g）/0.1 mm	60~80	70.2	T 0604沥青针入度试验
软化点（环球法）/℃	>46	47.5	T 0606 沥青软化点试验（环球法）
延度（15℃）/ cm	≥100	>100	T 0605 沥青延度试验
闪点/℃	≥260	273	T 0611 沥青闪点与燃点试验（克利夫兰开口杯法）
密度/ g·cm^-3	—	1.025	T 0603 沥青密度与相对密度试验

Tab.1. Technical indicators of shell 70# matrix asphalt

样品	针入度/0.1 mm	软化点/℃	延度/cm	老化后		弹性恢复/%	布氏黏度（135 ℃）/Pa·s	48 h软化点差/℃
样品	针入度/0.1 mm	软化点/℃	延度/cm	针入度比/%	延度/cm	弹性恢复/%	布氏黏度（135 ℃）/Pa·s	48 h软化点差/℃
B	45	69.6	33	86.8	21	99	2.14	2.4
G	42	88.9	29	90.5	18	95	2.68	0.8

Tab.2. Performance indicators of the modified asphalt

Fig.1. FTIR spectra of sample A， B and G

Fig.2. Schematic diagram of thermal stability process of SBS modified asphalt

Fig.3. Standard deviation FTIR spectra

Fig.4. Fluorescence microscope images of the samples

Fig.5. Linear fitting diagram of softening point and SBS content

Fig.6. Standard FTIR spectra of the composite modified asphalt

样品	SBS特征峰（966 cm^-1）			基质沥青特征峰（1 377 cm^-1）			S
样品	积分面积起点	积分面积终点	S $966 c m - 1$	积分面积起点	积分面积终点	S $1 377 c m - 1$	S
C	989.303	925.664	0.159	1 400.353	1 328.571	6.428	0.025
D	989.661	927.950	0.756	1 400.067	1 332.740	6.376	0.119
E	985.447	927.593	1.063	1 401.995	1 336.857	6.329	0.168
F	985.447	925.664	1.221	1 400.067	1 338.714	6.314	0.193
G	989.160	925.667	1.347	1 396.210	1 338.857	6.302	0.214
H	983.160	927.768	1.777	1 396.210	1 339.126	6.315	0.281

样品	SBS特征峰（966 cm^-1）			基质沥青特征峰（1 377 cm^-1）			S
样品	积分面积起点	积分面积终点	S $966 c m - 1$	积分面积起点	积分面积终点	S $1 377 c m - 1$	S
C	989.303	925.664	0.159	1 400.353	1 328.571	6.428	0.025
D	989.661	927.950	0.756	1 400.067	1 332.740	6.376	0.119
E	985.447	927.593	1.063	1 401.995	1 336.857	6.329	0.168
F	985.447	925.664	1.221	1 400.067	1 338.714	6.314	0.193
G	989.160	925.667	1.347	1 396.210	1 338.857	6.302	0.214
H	983.160	927.768	1.777	1 396.210	1 339.126	6.315	0.281

Tab.3. Characteristic peak area of the composite modified asphalt

Fig.7. Fitting diagram of S and SBS content

项目	数值
复相关系数	0.998 6
决定系数	0.997 2
校正的决定系数	0.994 5
标准误差	0.117 6
观测值	5

Tab.4. Advantages and disadvantages evaluation of the regression model

项目

自由度（df）

误差平方和

（SS）

均方差

（MS）

检验值

（F）

F_α临界值

（Sig.F）

Tab.5. Test of global regression effect

项目

偏回归

系数

标准

误差

Tab.6. Test of partial regression coefficient

Fig.8. Diagnosis diagram of SBS content model

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