RTP-PVA混杂纤维的工程水泥基复合材料干缩性能试验研究

doi:10.12068/j.issn.1005-3026.2024.03.013

摘要/Abstract

摘要：

为研究回收轮胎聚合物（recycled tyre polymer，RTP）和聚乙烯醇（polyvinyl alcohol，PVA）混杂纤维对工程水泥基复合材料（engineered cementitious composites，ECC）干缩性能的影响，对RTP-PVA混杂纤维总体积分数为2.0%的ECC进行流动性、直接拉伸和干缩试验，并分析混杂纤维作用机理和干缩计算模型.结果表明：RTP纤维替代率为12.5%~50%对ECC流动性影响不大，比单掺PVA纤维的ECC流动性降低1.09%~3.69%.ECC的抗拉强度随RTP纤维替代率的增加而降低，不同比例的混杂纤维比单掺PVA纤维的ECC抗拉强度降低了23.6%~56.6%.不同比例混杂纤维ECC干缩率曲线趋势相近，7 d时干缩率为28 d时的80.92%~82.77%.ECC的干缩率随RTP纤维替代率的增加而降低，28 d时不同RTP纤维替代率的混杂纤维比单掺PVA纤维的ECC干缩率降低了0.80%~2.09%.RTP-PVA混杂纤维可在ECC中协同发挥作用抑制基体干缩，结合试验结果得到适合RTP-PVA混杂纤维ECC的指数型干缩预测模型.

关键词: 回收轮胎聚合物纤维, 聚乙烯醇纤维, 工程水泥基复合材料, 干缩, 预测模型

Abstract:

In order to study the effect of recycled tyre polymer （RTP） and polyvinyl alcohol （PVA） hybrid fibres on the dry‐shrinkage properties of engineered cementitious composite （ECC）， the fluidity， direct tension and dry‐shrinkage tests of RTP‐PVA hybrid fibre reinforced ECC with a total volume fraction of 2.0% were carried out， and the mechanism and dry‐shrinkage calculation model of hybrid fibres were analyzed. The results show that RTP fibres replacement ratio of 12.5%~50% has minimal effect on the ECC fluidity， which is 1.09%~3.69% lower than that of single doped PVA fibres. The tensile strength of ECC decreases with the increase of RTP fibres replacement ratio to PVA fibres， the tensile strength of ECC with different proportions of hybrid fibres is 23.6% to 56.6% lower compared with that of single PVA fibres. The drying shrinkage rate curves of ECC with different proportions of hybrid fibres exhibit similar trends， and the drying shrinkage rate at 7 d is 80.92%~82.77% of that at 28 d. The drying shrinkage rate of ECC decreased with the increase of RTP fibres replacement ratio to PVA fibres， and the drying shrinkage rate of ECC with different proportions of hybrid fibres decreased by 0.80% to 2.09% compared with that of single PVA fibres at 28 d. RTP‐PVA hybrid fibres can play a synergistic role in inhibiting drying shrinkage of ECC. Combined with the experimental results， an index drying shrinkage prediction model suitable for RTP‐PVA hybrid fibre ECC is proposed.

Key words: recycled tyre polymer（RTP） fibre, polyvinyl alcohol（PVA） fibre, engineered cementitious composites（ECC）, drying shrinkage, prediction model

中图分类号:

TU 528.572

陈猛, 洪宇. RTP-PVA混杂纤维的工程水泥基复合材料干缩性能试验研究[J]. 东北大学学报（自然科学版）, 2024, 45(3): 407-414.

Meng CHEN, Yu HONG. Test Study on Drying Shrinkage Properties of Engineered Cementitious Composites with RTP‐PVA Hybrid Fibre[J]. Journal of Northeastern University(Natural Science), 2024, 45(3): 407-414.

图/表 14

图1 纤维形貌(a)—RTP纤维； (b)—PVA纤维.

Fig.1 Topography of fibre

图2 ECC基体材料粒径分布

Fig.2 Particle size distribution of ECC matrix material

图3 RTP纤维长度与直径分布图(a)—长度； (b)—直径.

Fig.3 Distribution of length and diameter of RTP fibre

表1 纤维的物理及力学性能

Table 1 Physical and mechanical properties of fibres

纤维类型	长度/mm	直径/μm	密度/(g·cm^-3)	抗拉强度/MPa	弹性模量/GPa
RTP	5.2±2.4	21.4±4.4	1.476±0.003	761±115	3.8±0.7
PVA	12	40	1.3	1 560	41

表2 材料ECC配合比

Table 2 Mixture proportions of materials ECC

材料类型	m/ kg					体积分数/%		RTP纤维替代率/%
材料类型	水泥	粉煤灰	硅砂	水	减水剂	RTP纤维	PVA纤维	RTP纤维替代率/%
P2.0R0	42.5	676	451	335	4.96	0	2.0	0
P1.75R0.25	42.5	676	451	335	4.96	0.25	1.75	12.5
P1.5R0.5	42.5	676	451	335	4.96	0.5	1.5	25
P1.25R0.75	42.5	676	451	335	4.96	0.75	1.25	37.5
P1.0R1.0	42.5	676	451	335	4.96	1.0	1.0	50

图4 直接拉伸试验装置及试件尺寸（单位：mm）(a)—试验装置； (b)—试件尺寸.

Fig. 4 Testing equipment and specimen size of direct tension test (unit： mm)Sd=X0-XtL0×100% . （1）

图5 不同RTP纤维替代率的ECC流动度

Fig.5 Slump of ECC with different replacement ratio of RTP fibre

图6 RTP-PVA混杂纤维ECC应力-应变曲线

Fig.6 Stress?strain curves of RTP‐PVA hybrid fibre reinforced ECC

图7 RTP-PVA混杂纤维ECC干缩率

Fig.7 Drying shrinkage rate of RTP‐PVA hybrid fibre reinforced ECC

图8 不同RTP纤维替代率ECC在7 d和28 d时的干缩率

Fig.8 Drying shrinkage rate of ECC under different replacement ratio of RTP fibre at 7 d and 28 d

图9 RTP-PVA混杂纤维作用机理(a)—基体中纤维横截面图； (b)—纤维桥连作用图.

Fig.9 Mechanism of action of RTP‐PVA hybrid fibres

图10 RTP-PVA混杂纤维与基体黏结

Fig.10 Bonding between RTP‐PVA hybrid fibre and the matrix

表3 不同预测模型拟合参数及相关系数

Table 3 Fitness parameters and correlation coefficient of different predicting models

材料类型	双曲线模型				单对数模型				指数模型
材料类型	a	b	R²	?²×10⁴	c	d	R²	?²×10⁴	f	g	R²	?²×10⁴
P2.0R0	19.21	4.68	0.973	10.52	0.25	5.09	0.938	23.92	1.04	-0.22	0.992	3.30
P1.75R0.25	18.25	4.63	0.968	11.33	0.20	4.86	0.931	24.74	1.05	-0.23	0.990	3.58
P1.5R0.5	18.17	4.85	0.968	11.28	0.03	4.85	0.934	23.52	1.06	-0.22	0.989	3.72
P1.25R0.75	17.22	5.11	0.966	10.68	-0.14	4.59	0.935	20.79	1.06	-0.22	0.987	3.90
P1.0R1.0	17.30	5.58	0.955	14.60	-0.47	4.63	0.925	24.30	1.08	-0.21	0.980	6.46

图11 不同模型干缩率计算值与试验值对比(a)—P2.0R0； (b)—P1.75R0.25； (c)—P1.5R0.5； (d)—P1.25R0.75； (e)—P1.0R1.0.

Fig.11 Comparison between calculated value and experimental value of drying shrinkage rate of different models

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