钢纤维-聚丙烯纤维混杂对再生混凝土抗冲击性能的影响

孔祥清; 何文昌; 邢丽丽; 王学志

doi:10.13801/j.cnki.fhclxb.20191106.001

钢纤维-聚丙烯纤维混杂对再生混凝土抗冲击性能的影响

doi: 10.13801/j.cnki.fhclxb.20191106.001

辽宁工业大学　土木建筑工程学院，锦州 121001

基金项目: 国家自然科学基金(51479168)；辽宁省自然科学基金(SY2016001)；辽宁省"兴辽英才计划"项目(XLYC1807044)

详细信息

通讯作者:
孔祥清，博士，教授，硕士生导师，研究方向为新型材料及结构力学性能　E-mail：xqkong@lnut.edu.cn

中图分类号: TU528.572
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出版历程
- 收稿日期: 2019-07-18
- 录用日期: 2019-11-04
- 网络出版日期: 2019-11-06
- 刊出日期: 2020-07-15

Effect of steel fiber-polypropylene fiber hybrid additon on impact resistance of recycled aggregate concrete

Department of Civil & Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, China

摘要

摘要: 为研究钢纤维(SF)与聚丙烯纤维(PPF)混杂后对再生混凝土(RAC)抗冲击性能的影响，采用落锤弯曲冲击试验装置对素RAC、SF/RAC、PPF/RAC和SF-PPF/RAC进行抗冲击试验；分析了不同纤维掺量和掺入方式对RAC抗冲击性能的影响；采用数理统计模型对冲击试验结果进行拟合和失效概率预测，并对SF-PPF/RAC抗冲击性能的阻裂增强机制进行深入分析。结果表明：单掺或混杂纤维均可提高RAC的抗冲击性能；其中混合掺入体积分数为1.5vol%的SF和体积分数为0.9vol%的PPF时，RAC抗冲击耗能的提高幅度最大，RAC基体的延性和韧性最佳。SF-PPF/RAC的抗冲击次数很好地服从两参数Weibull分布。SF与PPF混杂对改善RAC的抗冲击性能呈现出优异的混杂增强效应。
- 混杂纤维 /
- 再生混凝土 /
- 抗冲击性能 /
- Weibull分布 /
- 阻裂增强机制
Abstract: In order to investigate the effect of hybrid steel fibe (SF) and polypropylene fiber (PPF) on the impact resistance of the recycled aggregate concrete (RAC), the flexural impact resistances of plain RAC, SF/RAC, PPF/RAC and SF-PPF/RAC were studied by drop weight impact test. The effects of fiber content and the way of incorporation on the impact resistance of RAC were analyzed. The mathematical statistical model was used to fit the impact experimental results and predict the failure probability. The crack resistance enhancement mechanism of SF-PPF/RAC was further analyzed. The results indicate that both single fibers and hybrid fibers can improve the impact performance of RAC. The specimen with the hybrid volume fraction of 1.5vol% SF and volume fraction of 0.9vol% PPF is found to have the maximum increase in impact energy consumption and the best ductility and toughness in concrete matrix. The impact resistance numbers of SF-PPF/RAC are well subordinated to the two-parameter Weibull distribution. The SF-PPF exhibit significant hybrid effect on improving the impact resistance of RAC.
- hybrid fiber /
- recycled aggregate concrete /
- impact resistance /
- Weibull distribution /
- crack resistance enhancement mechanism

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图 1 试验用材料

Figure 1. Materials for testing

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图 2 混凝土落锤抗弯冲击试验装置

Figure 2. Drop weight impact test device for concrete

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图 3 SF-PPF/RAC的抗冲击能力

Figure 3. Impact resistance contrast of SF-PPF/RAC

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图 4 SF-PPF/RAC的延性比和韧性系数

Figure 4. Ductility ratios and toughness coefficients of SF-PPF/RAC

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图 5 SF-PPF/RAC试件冲击破坏断裂面

Figure 5. Impact damage surfaces of SF-PPF/RAC specimens

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图 6 SF-PPF/RAC抗冲击破坏次数N₂的Weibull分布线性拟合曲线

Figure 6. Linear regression curves of impact resistance number N₂ in Weibull distribution of SF-PPF/RAC

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图 7 不同失效概率下SF-PPF/RAC冲击破坏次数N₂与SF体积分数的关系曲线

Figure 7. Relation curves between impact number N₂ and SF volume fraction of SF-PPF/RAC under different failure probabilities

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图 8 不同失效概率下SF-PPF/RAC冲击破坏次数N₂与PPF体积分数的关系曲线

Figure 8. Relation curves between impact number N₂ and PPF volume fraction of SF-PPF/RAC under different failure probabilities

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图 9 SF-PPF/RAC抗冲击性能的混杂增强效应

Figure 9. Hybrid enhancement effect of impact resistance of SF-PPF/RAC

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图 10 SF-PPF/RAC试件冲击破坏形态

Figure 10. Impact failure forms of SF-PPF/RAC specimens

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图 11 SF-PPF/RAC的阻裂机制模型

Figure 11. Crack resistance model of SF-PPF/RAC

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图 12 SF-PPF/RAC试件破坏断面的裂缝

Figure 12. Crack on fracture surface of SF-PPF/RAC

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表 1 再生粗骨料的物理性能

Table 1. Physical properties of recycle coarse aggregate

Size/mm	Apparent density/(kg·m^–3)	Bulk density/(kg·m^–3)	Crushing index/%	Water absorption/%	Mud content/%
5–20	2 640	1 460	17.1	3.4	0.2

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表 2 钢纤维(SF)和聚丙烯纤维(PPF)的物理性能

Table 2. Physical properties of steel fiber(SF) and polypropylene fiber(PPF)

Fiber type	Length/mm	Aspect ration	Density/(g·cm⁻³)	Tensile strength/MPa	Elastic modulus/GPa
SF	30	60	7.8	≥800	210
PPF	12	343	0.91	≥350	3.5

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表 3 SF-PPF/再生混凝土(RAC)试件编号和配合比设计

Table 3. Specimen codes and mix design of SF-PPF/recycled aggregate concrete(RAC)

No.	Notation	Cement/ (kg·m⁻³)	Sand/ (kg·m⁻³)	Water/ (kg·m⁻³)	Aggregate/ (kg·m⁻³)	Water reducer/ (kg·m⁻³)	SF/vol%	PPF/vol%
RC1	RAC	540	618	190	1 052	2.16	−	−
RC2	SF0.5/RAC	540	618	190	1 052	2.16	0.5	−
RC3	SF1.0/RAC	540	618	190	1 052	2.16	1.0	−
RC4	SF1.5/RAC	540	618	190	1 052	2.16	1.5	−
RC5	PPF0.6/RAC	540	618	190	1 052	2.16	−	0.6
RC6	PPF0.9/RAC	540	618	190	1 052	2.16	−	0.9
RC7	PPF1.2/RAC	540	618	190	1 052	2.16	−	1.2
RC8	SF0.5-PPF0.6/RAC	540	618	190	1 052	2.16	0.5	0.6
RC9	SF0.5-PPF0.9/RAC	540	618	190	1 052	2.16	0.5	0.9
RC10	SF0.5-PPF1.2/RAC	540	618	190	1 052	2.16	0.5	1.2
RC11	SF1.0-PPF0.6/RAC	540	618	190	1 052	2.16	1.0	0.6
RC12	SF1.0-PPF0.9/RAC	540	618	190	1 052	2.16	1.0	0.9
RC13	SF1.0-PPF1.2/RAC	540	618	190	1 052	2.16	1.0	1.2
RC14	SF1.5-PPF0.6/RAC	540	618	190	1 052	2.16	1.5	0.6
RC15	SF1.5-PPF0.9/RAC	540	618	190	1 052	2.16	1.5	0.9
RC16	SF1.5-PPF1.2/RAC	540	618	190	1 052	2.16	1.5	1.2

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表 4 SF-PPF/RAC的抗压强度和抗冲击试验结果

Table 4. Test results of compressive strength and impact resistance of SF-PPF/RAC

No.	Notation	f_cu/MPa	Specimen number						Average value	Impact energy/J	C	μ
			1	2	3	4	5	6	Average value	Impact energy/J
			N₁/N₂	N₁/ N₂	N₁/ N₂	N₁/ N₂	N₁/ N₂	N₁/ N₂	N₁/ N₂	N₁/ N₂
RC1	RAC	49.2	2/3	2/3	3/4	3/4	4/5	4/6	3/4	26.5/35.3	–	–
RC2	SF0.5/RAC	55.2	3/12	3/16	4/18	4/21	5/18	6/23	4/18	35.3/158.8	4.5	3.5
RC3	SF1.0RAC	58.4	4/42	4/54	5/51	5/58	6/63	6/74	5/57	44.1/502.7	14.3	10.4
RC4	SF1.5/RAC	60.6	5/62	6/75	7/79	7/92	8/85	8/105	7/83	61.7/723.1	20.8	10.9
RC5	PPF0.6/RAC	48.1	2/8	3/11	3/12	4/13	4/19	5/15	4/13	35.3/114.7	3.3	2.3
RC6	PPF0.9/RAC	47.2	3/9	3/12	4/14	5/15	5/17	6/23	4/15	35.3/132.3	3.8	2.8
RC7	PPF1.2/RAC	46.9	3/14	4/15	5/21	5/25	6/24	6/29	5/21	44.1/185.2	5.3	3.2
RC8	SF0.5-PPF0.6/RAC	54.1	3/16	3/24	4/17	4/32	5/26	5/41	4/26	35.3/229.3	6.5	5.5
RC9	SF0.5-PPF0.9/RAC	52.7	3/29	3/35	4/39	5/37	7/41	7/51	5/37	44.1/326.3	9.3	6.4
RC10	SF0.5-PPF1.2/RAC	50.8	3/43	4/45	4/51	5/54	6/63	8/68	5/54	44.1/476.3	13.5	9.8
RC11	SF1.0-PPF0.6/RAC	56.2	4/64	6/86	6/104	7/94	7/107	8/121	6/96	52.9/846.7	24.0	15.0
RC12	SF1.0-PPF0.9/RAC	50.4	4/93	5/105	6/108	7/116	7/127	9/144	6/115	52.9/1 014.3	28.8	18.2
RC13	SF1.0-PPF1.2/RAC	47.8	5/137	6/167	7/156	7/185	8/174	12/215	8/172	70.6/1 517.0	43.0	20.5
RC14	SF1.5-PPF0.6/RAC	57.4	5/184	8/136	8/162	9/189	11/207	13/236	9/186	79.4/1 640.5	46.5	19.7
RC15	SF1.5-PPF0.9/RAC	45.2	6/188	8/225	10/248	11/236	13/256	15/275	11/238	97.0/2 099.2	59.5	20.6
RC16	SF1.5-PPF1.2/RAC	44.2	5/114	7/176	8/195	9/215	13/257	15/225	10/197	88.2/1 737.5	49.3	18.7
Notes: f_cu—Cube compressive strength at age of 28d; C—Toughness coefficient; μ—Ductility ratio. N₁, N₂—Impact number.

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表 5 SF-PPF/RAC抗冲击次数的Weibull分布线性回归分析结果

Table 5. Results of linear regression in Weibull distribution for impact resistance numbers of SF-PPF/RAC

Number	Notation	Regression coefficient α		Regression coefficient β		Correlation coefficient R²
Number	Notation	N₁	N₂	N₁	N₂	N₁	N₂
RC1	RAC	3.179	3.612	3.869	5.540	0.841	0.851
RC2	SF0.5/RAC	3.612	4.579	5.540	13.641	0.852	0.961
RC3	SF1.0RAC	5.447	5.434	9.194	22.385	0.839	0.969
RC4	SF1.5/RAC	5.710	5.820	11.399	26.138	0.942	0.979
RC5	PPF0.6/RAC	3.230	3.576	4.416	9.548	0.943	0.966
RC6	PPF0.9/RAC	3.476	3.286	5.479	9.262	0.870	0.961
RC7	PPF1.2/RAC	3.878	3.504	6.504	11.104	0.976	0.919
RC8	SF0.5-PPF0.6/RAC	4.322	2.823	6.399	9.546	0.840	0.913
RC9	SF0.5-PPF0.9/RAC	2.571	5.505	4.393	20.541	0.843	0.920
RC10	SF0.5-PPF1.2/RAC	2.954	5.634	5.104	22.898	0.913	0.909
RC11	SF1.0-PPF0.6/RAC	4.222	4.708	8.201	21.900	0.895	0.965
RC12	SF1.0-PPF0.9/RAC	3.672	6.726	7.157	32.376	0.971	0.934
RC13	SF1.0-PPF1.2/RAC	3.777	6.879	7.910	35.866	0.885	0.949
RC14	SF1.5-PPF0.6/RAC	3.156	2.822	7.301	14.833	0.942	0.967
RC15	SF1.5-PPF0.9/RAC	3.182	7.957	7.845	43.985	0.996	0.967
RC16	SF1.5-PPF1.2/RAC	2.573	3.632	6.119	19.469	0.954	0.931

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表 6 不同失效概率下SF-PPF/RAC的抗冲击次数

Table 6. Impact resistance numbers of SF-PPF/RAC under different failure probabilities

Number	Notation	Failure probability P_r
		5%		15%		30%
		N₁	N₂	N₁	N₂	N₁	N₂
RC1	RAC	1	2	2	3	2	4
RC2	SF0.5/RAC	2	10	3	13	4	16
RC3	SF1.0RAC	3	36	4	44	5	51
RC4	SF1.5/RAC	4	54	5	65	6	75
RC5	PPF0.6/RAC	2	6	2	9	3	11
RC6	PPF0.9/RAC	2	7	3	10	4	12
RC7	PPF1.2/RAC	3	10	3	14	4	18
RC8	SF0.5-PPF0.6/RAC	2	10	3	16	4	20
RC9	SF0.5-PPF0.9/RAC	2	24	3	30	4	35
RC10	SF0.5-PPF1.2/RAC	2	34	3	42	4	49
RC11	SF1.0-PPF0.6/RAC	4	56	5	71	6	84
RC12	SF1.0-PPF0.9/RAC	3	79	4	94	5	106
RC13	SF1.0-PPF1.2/RAC	4	119	5	141	6	158
RC14	SF1.5-PPF0.6/RAC	4	67	6	101	7	133
RC15	SF1.5-PPF0.9/RAC	5	173	7	200	9	221
RC16	SF1.5-PPF1.2/RAC	3	94	5	129	7	160

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