乳化沥青橡胶混凝土的力学性能

林强; 刘赞群; 禹雷; 周蕴婵; 崔雨

doi:10.13801/j.cnki.fhclxb.20220513.003

乳化沥青橡胶混凝土的力学性能

doi: 10.13801/j.cnki.fhclxb.20220513.003

林强^1,,
刘赞群^1, ,,
禹雷²,
周蕴婵¹,
崔雨¹

1.
中南大学　土木工程学院，长沙 410075
2.
中铁工程设计咨询集团有限公司，北京 100055

详细信息

通讯作者:
刘赞群，博士，教授，博士生导师，研究方向为高铁用关键工程材料、水泥乳化砂浆、自密实混凝土和混凝土耐久性等 E-mail: zanqun.liu@csu.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2022-03-18
- 修回日期: 2022-05-07
- 录用日期: 2022-05-07
- 网络出版日期: 2022-05-16
- 刊出日期: 2023-03-15

Mechanical properties of emulsified asphalt rubber concrete

LIN Qiang^1
,,
LIU Zanqun^{1
, ,},
YU Lei²,
ZHOU Yunchan¹,
CUI Yu¹

1.
School of Civil Engineering, Central South University, Changsha 410075, China
2.
China Railway Engineering Design and Consulting Group CO., LTD., Beijing 100055, China

摘要

摘要: 对用乳化沥青(Emulsified asphalt，EA)改善橡胶混凝土(Crumb rubber concrete，CRC)的力学性能进行了研究。通过抗压、抗折、劈裂抗拉和三点弯曲试验，研究了5%、10%和15% 3种橡胶掺量(等体积取代细骨料)下，EA理论计算成膜覆盖橡胶颗粒表面4层、6层和8层膜对应不同EA掺量对CRC力学性能的影响。试验结果发现，对比未预处理CRC和NaOH预处理CRC两个对照组：掺入不同掺量EA后，不同橡胶掺量的CRC的抗压强度和劈裂抗拉强度均有较大提高，CRC的峰值位移显著增大，弯曲弹性模量E_b明显降低；乳化沥青与橡胶质量比为0.15(6层EA膜)时，3种橡胶掺量下CRC较未预处理组相比抗压强度平均提高3.5%，峰值位移提高27.6%，E_b降低21.8%，乳化沥青橡胶混凝土具有较突出的力学性能复合效应。
- 橡胶颗粒 /
- 混凝土 /
- 乳化沥青 /
- 力学性能 /
- 回收
Abstract: The effects of emulsified asphalt (EA) on the mechanical properties of crumb rubber concrete (CRC) were explored. The fine aggregate was replaced with 5%, 10% and 15% rubber by volume in concrete, and different EA contents corresponding to 4, 6 and 8 layers of films covering the surface of rubber particles according to theoretical calculation were studied. The results of compressive strength, flexural strength, splitting tensile strength and three-point bending experiments show that, compared with the unpretreated CRC and NaOH pretreated CRC, the compressive strength and splitting tensile strength of the CRC with different rubber contents are greatly improved by adding different amounts of EA, the peak displacement increases and the flexural elastic modulus E_b decreases significantly; when the mass ratio of emulsified asphalt to rubber is 0.15 (6 layers of EA film), compared with the unpretreated CRC, the average increase in compressive strength is 3.5%, the peak displacement is 27.6%, and E_b is 21.8% lower for CRC at three rubber contents, emulsified asphalt-rubber concrete has a more prominent composite effect of mechanical properties.
- rubber particle /
- concrete /
- emulsified asphalt /
- mechanical properties /
- recycle

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图 1 橡胶颗粒粒度分布曲线

Figure 1. Size distribution curve of rubber particles

下载: 全尺寸图片幻灯片

图 2 沥青成膜覆盖理想模型

Figure 2. Ideal model of asphalt film covering

R—Asphalt particle radius; EA—Emulsified asphalt

下载: 全尺寸图片幻灯片

图 3 不同乳化沥青(EA)膜数对橡胶混凝土抗压强度的影响

Figure 3. Effect of different layers of emulsified asphalt (EA) film on compressive strength of crumb rubber concrete

下载: 全尺寸图片幻灯片

图 4 不同EA膜数对橡胶混凝土抗折强度的影响

Figure 4. Effect of different layers of EA film on flexural strength of crumb rubber concrete

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图 5 不同EA膜数对橡胶混凝土劈裂抗拉强度影响

Figure 5. Effect of different layers of EA film on splitting tensile strength of crumb rubber concrete

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图 6 不同橡胶掺量下橡胶混凝土荷载-位移曲线

Figure 6. Load-deflection curves of crumb rubber concrete with different replacements of rubber

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图 7 不同EA膜数对橡胶混凝土弯曲弹性模量E_b的影响

Figure 7. Effect of different layers of EA film on bending modulus of elasticity E_b of crumb rubber concrete

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图 8 不同EA膜数对橡胶混凝土韧性指标的影响

Figure 8. Effect of different layers of EA film on toughness index of crumb rubber concrete

Un—Untreatment; 4, 6, 8—Layers of EA film

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图 9 橡胶混凝土的微观形貌

Figure 9. Microscopic structures of crumb rubber content

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图 10 沥橡比对橡胶混凝土的综合影响

Figure 10. Comprehensive effect of asphalt to rubber ratio on crumb rubber concrete

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图 11 不同沥橡比对橡胶混凝土抗压强度影响

Figure 11. Changes of compressive strength of rubber concrete with different asphalt to rubber ratios

l₁, l₂, l₃—Asphalt to rubber ratios; R²—Fit coefficient

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表 1 混凝土配合比

Table 1. Mix proportion of concrete (kg·m⁻³)

Type	Specimen denotation	Cement	Water	Coarse aggregate	Fine aggregate	Rubber particles	Emulsified asphalt
PC	RC0	450	180	1152.73	622.48	0	—
Rubber concrete	CRC5	450	180	1152.73	591.36	11.35	—
	CRC10	450	180	1152.73	560.23	22.70	—
	CRC15	450	180	1152.73	529.11	34.05	—
NaOH treatment	NCRC5	450	180	1152.73	591.36	11.35	—
	NCRC10	450	180	1152.73	560.23	22.70	—
	NCRC15	450	180	1152.73	529.11	34.05	—
EA treatment	CRC5 A4	450	179.50	1152.73	591.36	11.35	1.14
	CRC5 A6	450	179.24	1152.73	591.36	11.35	1.71
	CRC5 A8	450	178.99	1152.73	591.36	11.35	2.28
	CRC10 A4	450	178.99	1152.73	560.23	22.70	2.28
	CRC10 A6	450	178.48	1152.73	560.23	22.70	3.42
	CRC10 A8	450	177.98	1152.73	560.23	22.70	4.56
	CRC15 A4	450	178.31	1152.73	529.11	34.05	3.42
	CRC15 A6	450	177.46	1152.73	529.11	34.05	5.13
	CRC15 A8	450	176.62	1152.73	529.11	34.05	6.84
Notes: PC—Plain concrete; (N)CRC5, (N)CRC10, (N)CRC15—Rubber volume substitution ratios of 5%, 10% and 15%, respectively; CRC—Crumb rubber concrete; A4, A6, A8—Layer of emulsified asphalt (EA) of 4, 6 and 8, respectively.

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表 2 橡胶混凝土弯曲韧性参数

Table 2. Flexural toughness parameters of crumb rubber concrete

Type	Specimen denotation	E_b/ GPa	Integral area/ (kN·mm)	Peak load/ kN	Peak displacement/ mm	Deflection of initial crack/mm
PC	RC0	3.30	1.960	13.791	0.273	0.239
Rubber concrete	CRC5	2.69	2.118	12.609	0.307	0.269
	CRC10	2.35	2.132	11.823	0.326	0.289
	CRC15	2.22	2.111	11.695	0.337	0.302
NaOH treatment	NCRC5	2.63	2.052	12.753	0.320	0.278
	NCRC10	2.30	1.997	11.808	0.330	0.290
	NCRC15	2.01	2.089	11.623	0.360	0.296
EA treatment	CRC5 A4	2.52	2.534	13.362	0.351	0.304
	CRC5 A6	1.99	2.441	12.071	0.424	0.377
	CRC5 A8	1.90	2.452	11.752	0.431	0.385
	CRC10 A4	2.17	2.045	11.631	0.350	0.308
	CRC10 A6	1.78	2.379	11.596	0.422	0.373
	CRC10 A8	1.88	2.416	11.210	0.439	0.398
	CRC15 A4	1.90	2.027	10.992	0.354	0.306
	CRC15 A6	1.62	2.154	11.056	0.388	0.338
	CRC15 A8	1.71	2.484	10.959	0.431	0.368
Note: E_b—Bending modulus of elasticity.

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