聚乙烯纤维增强高延性碱矿渣复合材料的拉压性能及裂缝分布

阚黎黎; 庞成凯; 王飞; 薛佳旭; 赵树龙; 刘卫东; 赵玉静

doi:10.13801/j.cnki.fhclxb.20210302.003

聚乙烯纤维增强高延性碱矿渣复合材料的拉压性能及裂缝分布

doi: 10.13801/j.cnki.fhclxb.20210302.003

阚黎黎^1, ,,
庞成凯^1,,
王飞¹,
薛佳旭^1,,
赵树龙^1,,
刘卫东^1,,
赵玉静^2,

1.
上海理工大学　环境与建筑学院，上海 200093
2.
上海宝钢新型建材科技有限公司，上海 200431

基金项目: 国家自然科学基金(51508329)

详细信息

通讯作者:
阚黎黎，博士，副教授，研究方向为高性能土木工程材料　E-mail：kanlili@usst.edu.cn

中图分类号: TU528
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-31
- 录用日期: 2021-02-18
- 网络出版日期: 2021-03-02
- 刊出日期: 2021-12-01

Tensile and compressive properties and crack distribution of polyethylene fiber reinforced high ductile alkali-activated slag composites

KAN Lili^{1
, ,},
PANG Chengkai^1
,,
WANG Fei¹,
XUE Jiaxu^1
,,
ZHAO Shulong^1
,,
LIU Weidong^1
,,
ZHAO Yujing^2
,

1.
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
2.
Shanghai Baosteel New Building Materials Technology Limited Company, Shanghai 200431, China

摘要

摘要: 在碱激发作用下，以矿粉为主要原材料，粉煤灰为辅助材料，共同制备聚乙烯(PE)纤维增强高延性碱矿渣复合材料。通过轴向拉、压实验，研究不同养护龄期(1天、3天、7天、28天、56天、120天)下材料的拉压性能，并借助数字图像技术(DIC)对裂缝进行了表征。结果表明：高延性碱矿渣表现出较好的延性，具有早强特征。7天强度值可达极限强度的84%以上(极限拉压强度分别为5.05 MPa、91.24 MPa)，拉伸应变可达5.74%，多缝开裂基本饱和；28天后拉压性能趋于稳定(拉压强度、拉伸应变分别保持在6 MPa、100 MPa、6%)；DIC数字分析云图直观地描述了裂缝的形成及发展过程，可从一定程度上对开裂破坏方向及位置进行可靠预判。
- 高延性 /
- 纤维增强 /
- 碱矿渣 /
- 拉压性能 /
- 龄期 /
- 数字图像技术(DIC)
Abstract: Activated by alkaline activator, polyethylene (PE) fiber reinforced high ductile alkali-activated slag composites were prepared using slag as the main raw material and fly ash as auxiliary material. The tensile and compressive properties of the composites under different curing ages (1 day, 3 days, 7 days, 28 days, 56 days and 120 days) were studied through uniaxial tensile and compressive tests, and the cracks were characterized by a digital image correlation technology (DIC). The results show that the alkali-activated slag owns a good high ductility and early strength. The strength value at 7 days can reach more than 84% of the ultimate strengths (the ultimate tensile and compressive strengths are 5.05 MPa and 91.24 MPa, respectively), 5.74% for the tensile strain, and the multi-cracking is basically saturated. After 28 days, the tensile and compressive properties become stable (tensile and compressive strengths and tensile strain keep around 6 MPa, 100 MPa and 6%, respectively). DIC analysis cloud maps visually describe the formation and propagation of cracks, which can be applied to predict reliably the direction and location of cracks to a certain extent.
- high ductility /
- fiber reinforced /
- alkali-activated slag /
- tensile and compressive properties /
- curing ages /
- digital image correlation (DIC)

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图 1 矿粉、粉煤灰和砂的粒径分布

Figure 1. Particle size distribution of slag, fly ash and sand

下载: 全尺寸图片幻灯片

图 2 哑铃型试件示意图

Figure 2. Sketch of dumbbell-shaped specimen

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图 3 DIC基本原理示意图

Figure 3. Schematic diagram of DIC basic principle

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图 4 散斑制作流程

Figure 4. Flow chart of making speckle

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图 5 DIC试验装置及试件散斑表面

Figure 5. DIC test apparatus and speckle surface of specimen

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图 6 不同龄期下PE纤维增强高延性碱矿渣复合材料的单轴拉伸应力-应变曲线及DIC应变云图

Figure 6. Uniaxial tensile stress-strain curves and DIC strain contour maps of PE fiber reinforced alkali-activated slag composites at different ages

下载: 全尺寸图片幻灯片

图 7 PE纤维增强高延性碱矿渣拉伸性能与龄期的关系

Figure 7. Relationship between tensile properties of PE fiber reinforced alkali-activated slag composites and curing ages

下载: 全尺寸图片幻灯片

图 8 早龄期PE纤维增强高延性碱矿渣沿X方向的压缩位移及应变云图

Figure 8. Compressive displacement and strain contour maps of PE fiber reinforced high ductile alkali-activated slag composite specimens along X direction at early ages

下载: 全尺寸图片幻灯片

表 1 矿粉和粉煤灰的主要化学组成

Table 1. Main chemical composition of slag and fly ash wt%

Oxide	CaO	SiO₂	Al₂O₃	Fe₂O₃	MgO	SO₃	K₂O	Na₂O	TiO₂
Slag	42.6	35.2	10.4	0.51	4.95	2.0	0.40	0.31	0.53
Fly ash	16.4	35.4	27.8	2.4	0.75	5.66	0.59	0.16	1.55

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表 2 聚乙烯(PE)纤维增强高延性碱矿渣复合材料配合比

Table 2. Mix design proportion of polyethylene (PE) fiber reinforced high ductile alkali-activated slag composites

Slag/wt%	Fly ash/wt%	Sand/wt%	Na₂SiO₃/wt%	NaOH/wt%	Water/wt%	PE fiber/vol%
48.46	5.38	16.15	13.21	2.94	12.92	2

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表 3 不同龄期下PE纤维增强高延性碱矿渣试件裂缝的特性

Table 3. Crack characteristics of the PE fiber reinforced alkali-activated slag composite specimens at different ages

Curing age/day	Number of crack	Average crack width/μm	Average crack spacing/mm
1	9±1	229.21±23.62	8.59±0.42
3	17±2	175.74±29.33	4.78±0.57
7	29±2	160.81±12.22	2.80±0.16
28	34±1	147.34±4.33	2.35±0.07
56	31±1	158.41±9.65	2.58±0.07
120	33±2	145.20±1.92	2.43±0.12

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表 4 PE纤维增强高延性碱矿渣在不同龄期下的抗压强度

Table 4. Compressive strength of PE fiber reinforced high ductile alkali-activated slag composites at different ages

Curing age/day	1	3	7	28	56	120
Compressive strength/MPa	69.7±4.8	80.51±2.0	91.24±2.1	100.69±3.7	99.39±4.3	97.6±4.9

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