橡胶颗粒和稻壳灰复掺改性ECC拉压性能与裂缝特征

滕晓丹; 黎永鸿; 韦宵宁; 周俊杰

doi:10.13801/j.cnki.fhclxb.20231107.002

橡胶颗粒和稻壳灰复掺改性ECC拉压性能与裂缝特征

doi: 10.13801/j.cnki.fhclxb.20231107.002

滕晓丹^{1, 2, ,},
黎永鸿¹,
韦宵宁¹,
周俊杰¹

1.
广西大学　土木建筑工程学院，南宁 530004
2.
广西大学　广西防灾减灾与工程安全重点实验室，工程防灾与结构安全教育部重点实验室，南宁 530004

基金项目: 国家自然科学基金(11962001)；广西自然科学基金项目(2023GXNSFBA026268)

详细信息

通讯作者:
滕晓丹，博士，讲师，硕士生导师，研究方向为高延性水泥基复合材料　E-mail: xdteng@gxu.edu.cn

中图分类号: TU528.58；TB332
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出版历程
- 收稿日期: 2023-09-11
- 修回日期: 2023-10-13
- 录用日期: 2023-10-24
- 网络出版日期: 2023-11-08
- 刊出日期: 2024-07-01

Tensile and compressive properties and crack characteristics of rice husk ash and crumb rubber particles modified engineered cementitious composites

1.
School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
2.
Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China

Funds: National Natural Science Foundation of China (11962001); Guangxi Natural Science Foundation Project (2023GXNSFBA026268)

摘要

摘要: 采用稻壳灰为主要胶凝材料并掺入橡胶颗粒作为人工缺陷，制备低碳环保型的高延性水泥基复合材料(Rice husk ash and crumb rubbers engineered cementitious composites，CR-RHA/ECC)。通过宏观力学性能与微观实验，研究不同养护龄期下(7天和28天)橡胶掺入量(0、10%、20%、30%)对CR-RHA/ECC延性和开裂特性的影响。结果表明：随着龄期的增长，CR-RHA/ECC的延性存在较大差异，橡胶替代10%河砂使CR-RHA/ECC的7天龄期延性削弱了54%，而使CR-RHA/ECC的28天龄期增长了67%，随着龄期增长(28天龄期)，橡胶替代30%河砂可使CR-RHA/ECC的延性达6%，此时CR-RHA/ECC相较于无橡胶替代河砂组，CR-RHA/ECC的拉伸裂缝宽度减小了52.79%。
- 高延性水泥基复合材料 /
- 稻壳灰 /
- 橡胶 /
- 延性 /
- 裂缝宽度
Abstract: Rice husk ash is the primary supplementary cementitious material, with rubber particles injected as artificial flaws. Rice husk ash and crumb rubbers engineered cementitious composites (CR-RHA/ECC) are low carbon, ecologically friendly cementitious composites with good ductility. The effects of rubber content (0, 10%, 20%, 30%) on the ductility and cracking characteristics of CR-RHA/ECC at each curing ages (7 days and 28 days) were explored employing macroscopic mechanical properties and microscopic investigations. The results show that: With the increase of age, there is a great difference in the ductility of CR-RHA/ECC. The replacement of 10% river sand by CR weakens the ductility of CR-RHA/ECC at 7 days by 54% and increases the ductility of CR-RHA/ECC at 28 days by 67%. With the increase of age (28 days), When CR replaces 30% river sand, the ductility of CR-RHA/ECC can reach 6%, and the tensile fracture width of CR-RHA/ECC decreases by 52.79% compared with that of CR-RHA/ECC without CR replacement.
- high ductility cementitious composites /
- rice husk ash /
- crumb rubber /
- ductility /
- crack wide

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图 1 颗粒微观形态：(a) 稻壳灰(RHA)；(b) 粉煤灰(FA)

Figure 1. Microscopic morphology of particles: (a) RHA; (b) FA

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图 2 FA、RHA和普通硅酸盐水泥(OPC)粒度分布

Figure 2. Particle size distribution of FA, RHA and OPC

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图 3 狗骨试件尺寸(a)及测试图(b)

Figure 3. Dog bone specimen size (a) and test diagram (b)

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图 4 7天和28天CR-RHA/ECC抗压强度

Figure 4. Compressive strength of CR-RHA/ECC at 7 days and 28 days

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图 5 各组ECCs 7天应力-应变曲线

Figure 5. Stress-strain curves of ECCs at 7 days

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图 6 各组ECC 28天应力-应变曲线

Figure 6. Stress-strain curves of ECCs at 28 days

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图 7 7天(a)和28天(b)龄期延性变化归一化拟合曲线

Figure 7. Curves of ductility change at 7 days (a) and 28 days (b) normalized

R²—Correlation coefficient; A₁, A₂—Parameters of the fitting function; t₁, t₂—Parameters of the fitting function; a, b—Parameters of the fitting function

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图 8 PVA纤维单纤维拉拔曲线^[25]

Figure 8. Single fiber pull-out curve for PVA^[25]

P—Load; u—Displacement

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图 9 CR-RHA/ECC 28天多缝开裂图

Figure 9. Multi-cracking diagram of CR-RHA/ECC at 28 days

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图 10 CR对裂缝宽度影响的两种机制：(a) CR削弱基体；(b) CR桥接裂缝^[19]

Figure 10. Two mechanisms for CR to reduce crack width: (a) CR weakened matrix; (b) CR bridges cracks^[19]

σ—Bridging stress; δ—Crack opening displacement

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图 11 R60CR0和R60CR30的SEM图像

Figure 11. SEM images of R60CR0 and R60CR30

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图 12 28天R60CR0的EDS图谱

Figure 12. EDS patterns of R60CR0 at 28 days

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表 1 胶凝材料化学成分含量

Table 1. Chemical composition content of cementitious materials

Material	Chemical composition content/wt%
Material	SiO₂	K₂O	CaO	P₂O₅	Al₂O₃	MgO	Fe₂O₃	SO₃	Na₂O
RHA	85.90	3.43	1.11	0.75	0.55	0.46	0.37	0.19	0.11
FA	50.80	1.44	2.29	0.38	31.95	0.62	3.34	0.67	0.54
OPC	22.00	0.56	62.20	0.12	6.02	0.85	4.23	3.16	0.17
Notes: RHA—Rice husk ash; FA—Fly ash; OPC—Ordinary portland cement.

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表 2 稻壳灰掺入橡胶颗粒的工程水泥基复合材料(CR-RHA/ECC)配合比方案

Table 2. Mix design of rice husk ash and crumb rubbers engineered cementitious composites (CR-RHA/ECC)

Mixture	OPC/wt%	FA/wt%	RHA/wt%	River sand/wt%	CR/wt%	Water/wt%	HRWRA/wt%	PVA/vol%
R60CR0	1.00	0.88	0.76	1.15	0	0.80	7.00	2.00
R60CR10	1.00	0.88	0.76	1.04	0.03	0.80	7.00	2.00
R60CR20	1.00	0.88	0.76	0.92	0.05	0.80	7.00	2.00
R60CR30	1.00	0.88	0.76	0.81	0.08	0.80	7.00	2.00
R0CR0	1.00	2.20	0.00	1.15	0.00	0.80	2.00	2.00
Notes: HRWRA—Liquid superplasticizer; PVA—Polyvinyl alcohol; R represents RHA, CR represents crumbs rubber, in RiCRj, i represents the volume fraction of RHA to FA; j represents the volume ratio of CR to river sand.

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表 3 开裂与极限应力及其比值

Table 3. Cracking and ultimate strength and their ratio

Mixture	Cracking strength $ {\sigma }_{\mathrm{s}\mathrm{s}} $/MPa		Ultimate strength $ {\sigma }_{\mathrm{c}} $/MPa		$ {\sigma }_{\mathrm{c}}/{\sigma }_{\mathrm{s}\mathrm{s}} $
Mixture	7 d	28 d	7 d	28 d	7 d	28 d
R60CR0	2.47	2.82	3.47	4.36	1.44	1.55
R60CR10	2.49	2.61	2.51	4.33	1.09	1.66
R60CR20	2.24	2.36	2.49	3.89	1.00	1.65
R60CR30	2.23	2.52	2.45	4.11	1.17	1.63

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表 4 28天裂缝参数统计

Table 4. Statistical of crack parameters at 28 days

Mixture	Crack number	Crack width/μm	Mixture	Crack number	Crack width/μm
R60CR0	12	197	R60CR10	37	96
R60CR20	47	104	R60CR30	48	93

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