Study on properties and mechanism of asphalt modified with active rubber powder/nano⁃calcium carbonate composites

doi:10.19491/j.issn.1001-9278.2024.10.009

Abstract

Abstract:

At present the increasing traffic axle load brings a greater pressure to asphalt pavement. In this study， the waste rubber powders with different activation degrees and the surface⁃modified nano⁃CaCO₃ were employed as modifiers to prepare activated rubber powder/nano⁃CaCO₃ composite⁃modified asphalts， and three optimal modification systems were proposed through comparing the penetration and softening point ductility of the modified asphalts. The high⁃temperature performance of the modified asphalts was investigated by DSR， their anti⁃aging performance was evaluated by a thin film oven test， their storage stability was assessed by a segregation test， and their morphology and functional groups were analyzed by fluorescence microscopy and Fourier⁃transform infrared spectroscopy. The results indicated that an activation treatment improved the compatibility between rubber powders and asphalt， thus enhancing the storage stability of the modified asphalts. The modified asphalts obtained from the three optimal modification systems exhibited good high⁃ and low⁃temperature performance， anti⁃aging performance， workability， and storage stability. Both physical reaction and chemical reaction occurred in the modification of activated rubber powders and activated rubber powder/nano⁃CaCO₃ composite⁃modified asphalts. Among the three optimal modification systems， the sample 5# exhibited the best comprehensive performance.

Key words: rubber powder, nano?CaCO₃, asphalt, property, mechanism

CLC Number:

TQ327

DING Tianyu, YANG Yang, YAN Yong, ZHANG Shibo ZHAO Yanfang. Study on properties and mechanism of asphalt modified with active rubber powder/nano⁃calcium carbonate composites[J]. China Plastics, 2024, 38(10): 48-54.

Figures/Tables 9

References 18

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推荐体系	针入度/ 0.1 mm	软化点/ ℃	延度/ cm
1^#（1 %Nano⁃CaCO₃+14.8ACRMA）	96.2	50.8	9.7
2^#（1 %Nano⁃CaCO₃+28.4ACRMA）	88.9	50.3	10.1
3^#（1 %Nano⁃CaCO₃+36.4ACRMA）	94.7	49.2	10.5
4^#（3 %Nano⁃CaCO₃+14.8ACRMA）	90.5	51.6	8.9
5^#（3 %Nano⁃CaCO₃+28.4ACRMA）	87.6	52.0	9.3
6^#（3 %Nano⁃CaCO₃+36.4ACRMA）	92.5	49.6	10.1
7^#（5 %Nano⁃CaCO₃+14.8ACRMA）	87.5	49.3	8.3
8^#（5 %Nano⁃CaCO₃+28.4ACRMA）	85.5	49.7	8.9
9^#（5 %Nano⁃CaCO₃+36.4ACRMA）	89.6	48.9	9.6

推荐体系	针入度/ 0.1 mm	软化点/ ℃	延度/ cm
1^#（1 %Nano⁃CaCO₃+14.8ACRMA）	96.2	50.8	9.7
2^#（1 %Nano⁃CaCO₃+28.4ACRMA）	88.9	50.3	10.1
3^#（1 %Nano⁃CaCO₃+36.4ACRMA）	94.7	49.2	10.5
4^#（3 %Nano⁃CaCO₃+14.8ACRMA）	90.5	51.6	8.9
5^#（3 %Nano⁃CaCO₃+28.4ACRMA）	87.6	52.0	9.3
6^#（3 %Nano⁃CaCO₃+36.4ACRMA）	92.5	49.6	10.1
7^#（5 %Nano⁃CaCO₃+14.8ACRMA）	87.5	49.3	8.3
8^#（5 %Nano⁃CaCO₃+28.4ACRMA）	85.5	49.7	8.9
9^#（5 %Nano⁃CaCO₃+36.4ACRMA）	89.6	48.9	9.6

改性体系	质量损失/%	残留针入度比/%	软化点增量/℃	TFOT前延度/cm	TFOT后延度/cm
CRMA	0.49	61.5	9.8	7.5	4.34
14.8ACRMA	0.32	80.7	4.4	10	6.72
28.4ACRMA	0.26	82.3	4.0	10.7	7.55
36.4ACRMA	0.20	84.9	3.7	11.3	8.14
1^#	0.24	83.8	3.7	9.7	7.08
2^#	0.20	84.2	3.2	10.1	7.91
5^#	0.14	88.1	2.8	9.3	7.4

改性体系	质量损失/%	残留针入度比/%	软化点增量/℃	TFOT前延度/cm	TFOT后延度/cm
CRMA	0.49	61.5	9.8	7.5	4.34
14.8ACRMA	0.32	80.7	4.4	10	6.72
28.4ACRMA	0.26	82.3	4.0	10.7	7.55
36.4ACRMA	0.20	84.9	3.7	11.3	8.14
1^#	0.24	83.8	3.7	9.7	7.08
2^#	0.20	84.2	3.2	10.1	7.91
5^#	0.14	88.1	2.8	9.3	7.4

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