冻结状态聚乙烯醇纤维/水泥基复合材料抗压本构模型

刘佳鑫; 尹立强; 刘曙光; 闫长旺; 张菊; 王萧萧

doi:10.13801/j.cnki.fhclxb.20210622.002

冻结状态聚乙烯醇纤维/水泥基复合材料抗压本构模型

doi: 10.13801/j.cnki.fhclxb.20210622.002

刘佳鑫^1,,
尹立强^{2, 3, ,},
刘曙光^{1, 2, 3},
闫长旺^{1, 2, 3,},
张菊^{2, 3,},
王萧萧^{1, 3,}

1.
内蒙古工业大学　土木工程学院，呼和浩特 010051
2.
内蒙古工业大学　矿业学院，呼和浩特 010051
3.
生态型建筑材料与装配式结构内蒙古自治区工程研究中心，呼和浩特 010051

基金项目: 国家自然科学基金 (51968056；51768051)；内蒙古自治区科技创新引导重点项目(KCBJ2018016)；内蒙古自治区科技成果转化项目(2019CG072)；内蒙古工业大学科学研究项目(ZZ202003)

详细信息

通讯作者:
尹立强，博士，讲师，研究方向为纤维水泥基复合材料　E-mail：yinlq@imut.edu.cn

中图分类号: TU528.572
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- 文章访问数: 757
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-25
- 修回日期: 2021-05-25
- 录用日期: 2021-06-11
- 网络出版日期: 2021-06-22
- 刊出日期: 2022-03-23

Compressive constitutive model of polyvinyl alcohol fiber/cement composite material in frozen state

LIU Jiaxin^1
,,
YIN Liqiang^{2, 3
, ,},
LIU Shuguang^{1, 2, 3},
YAN Changwang^{1, 2, 3
,},
ZHANG Ju^{2, 3
,},
WANG Xiaoxiao^{1, 3
,}

1.
School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2.
School of Mining, Inner Mongolia University of Technology, Hohhot 010051, China
3.
Engineering Research Center of Inner Mongolia Autonomous Region for Ecological Building Materials and Assembly Structure, Hohhot 010051, China

摘要

摘要: 为了研究冻融循环后的聚乙烯醇纤维/水泥基复合材料在冻结状态下的抗压服役情况，设计了冻结聚乙烯醇纤维/水泥基复合材料抗压试验，先对试样进行0~300次的冻融循环，冻融循环试验后在−18℃的持续低温环境下对试样进行抗压试验，分析试样的抗压应力-应变关系及影响机制。在此基础上，结合等效应力原理和统计损伤理论，建立了冻结状态聚乙烯醇纤维/水泥基复合材料抗压本构模型，讨论了损伤变量随冻融循环次数的演化特征。结果表明：随着冻融循环次数的增加，冻结状态下聚乙烯醇纤维/水泥基复合材料的抗压峰值强度降低，峰值应变增加，极限破坏时脆性特征显著，高冻融循环次数下试样的弹性模量主要由试样中的孔隙冰来提供。建立的模型可以较好地预测实际经受冻融循环作用后的聚乙烯醇纤维/水泥基复合材料在冻结状态下的抗压应力-应变关系，冻融损伤变量和总损伤变量与冻融次数有显著相关性。
- 纤维增强水泥基复合材料 /
- 冻融循环 /
- 低温冻结 /
- 单轴压缩 /
- 本构模型
Abstract: In order to study the compressive service of polyvinyl alcohol fiber/cement composites under freezing condition after freeze-thaw cycle, the compressive test of polyvinyl alcohol fiber/cement composites under freezing condition was designed. Firstly, the samples were subjected to 0-300 freeze-thaw cycles, and then the samples were subjected to compressive test at −18℃ under continuous low temperature. The relationship between compressive stress and strain and its influence mechanism were analyzed. On this basis, combined with the principle of equiva-lent stress and statistical damage theory, the compressive constitutive model of polyvinyl alcohol fiber reinforced cement composites in frozen state was established, and the evolution characteristics of damage variable with the number of freeze-thaw cycles were discussed. The results show that: with the increase of freeze-thaw cycles, the peak compressive strength of polyvinyl alcohol fiber/cement composite decreases, the peak strain increases, and the brittleness is obvious at ultimate destruction. The elastic modulus of the sample under high freeze-thaw cycles is mainly provided by the pore ice in the sample. The established model can predict the compressive stress-strain relationship of polyvinyl alcohol fiber reinforced cement composites under freeze-thaw cycles. The freeze-thaw damage variate and total damage variate have significant correlation with freeze-thaw times.
- fiber reinforced cement based composite /
- freeze-thaw cycles /
- low temperature freezing /
- uniaxial compression /
- constitutive model

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图 1 冻结PVA/ECC抗压试验流程图

Figure 1. Flow chart of freezing PVA/ECC compressive test

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图 2 冻结PVA/ECC抗压试验实况

Figure 2. Actual situation of PVA/ECC compression test under freezing condition

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图 3 不同冻融循环次数(FTs)下PVA/ECC抗压应力-应变曲线：(a)融化状态；(b)冻结状态

Figure 3. PVA/ECC compressive stress-strain curves after different freeze thaw cycles (FTs): (a) Thawing; (b) Freezing

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图 4 冻融200次PVA/ECC抗压破坏形态：(a)融化状态；(b)冻结状态

Figure 4. Compressive failure mode of PVA/ECC after 200 freeze thaw cycles: (a) Thawing; (b) Freezing

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图 5 PVA/ECC试样抗压峰值强度

Figure 5. Peak compressive strength of PVA/ECC specimen

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图 6 PVA/ECC试样抗压峰值强度损失率

Figure 6. Compressive peak strength loss rate of PVA/ECC specimen

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图 7 PVA/ECC抗压峰值强度增益比

Figure 7. Compressive peak strength gain ratio of PVA/ECC

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图 8 PVA/ECC试样抗压峰值应变

Figure 8. Peak compressive strain of PVA/ECC specimen

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图 9 PVA/ECC试样抗压弹性模量

Figure 9. Compressive modulus of elasticity of PVA/ECC specimen

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图 10 不同参数值对PVA/ECC试样抗压应力-应变曲线的影响

Figure 10. Influence of different parameter values on the compressive stress-strain curves of PVA/ECC specimens

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图 11 不同冻融循环次数下PVA/ECC抗压本构模型参数的变化规律

Figure 11. Variation of parameters of PVA/ECC compressive constitutive model under different freeze-thaw cycles

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图 12 PVA/ECC抗压理论模型与试验结果对比

Figure 12. Comparison between theoretical model and experimental results of PVA/ECC compression

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图 13 不同冻融循环次数下PVA/ECC试样冻融损伤变量D_n

Figure 13. Freeze thaw damage variables D_nof PVA/ECC specimens under different freeze thaw cycles

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图 14 不同冻融循环次数下PVA/ECC试样总损伤变量D

Figure 14. Total damage variables D of PVA/ECC specimens under different freeze-thaw cycles

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表 1 聚乙烯醇(PVA)纤维性能指标

Table 1. Performance index of polyvinyl alcohol fiber (PVA) fiber

Tensile strength /MPa	Young's modulus /GPa	Diameter /μm	Length /mm	Elongation /%
1600	40	40	12	6

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表 2 PVA/水泥基复合材料(ECC)原材料配合比

Table 2. Mix proportion of raw materials of PVA/engineered cementitious composite (ECC)

Cement/ (kg·m⁻³)	Fly ash/ (kg·m⁻³)	Silica sand/ (kg·m⁻³)	Water/ (kg·m⁻³)	Superplasticizer/ (kg·m⁻³)	m_w/m_b	PVA fiber/ vol%
252.64	1010.57	454.76	303.17	17.68	0.24	2.00
Notes: m_w—Water consumption; m_b—Cementitious material consumption; m_w/m_b—Water binder ratio.

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表 3 PVA/ECC抗压理论模型相关参数

Table 3. Related parameters of PVA/ECC compression theoretical model

Freeze thaw cycles	Parameter a	Parameter b	Related coefficient R²
0	0.58632	0.78675	0.85045
100	0.82549	0.98783	0.84895
200	0.63271	1.18297	0.87027
300	0.66074	1.52024	0.95792

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