Test Study on Drying Shrinkage Properties of Engineered Cementitious Composites with RTP‐PVA Hybrid Fibre

doi:10.12068/j.issn.1005-3026.2024.03.013

Abstract

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

CLC Number:

TU 528.572

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.

Figures/Tables 14

Fig.1 Topography of fibre

Fig.2 Particle size distribution of ECC matrix material

Fig.3 Distribution of length and diameter of RTP fibre

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

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

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

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

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

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

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

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

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

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

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

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