﻿ PVA-DSECC抗压与抗折强度关系

# PVA-DSECC抗压与抗折强度关系Relationship between Compressive Strength and Flexural Strength of PVA-DSECC

Abstract: The Engineered Cementitious Composite (PVA-ECC) is prepared by using polyvinyl alcohol fiber, which has the characteristics of multi-crack cracking, high toughness and high ductility. The test uses desert sand instead of some common river sand to prepare PVA-ECC (referred to as PVA-DSECC), and the PVA-DSECC test block is tested for compression and flexural strength. The relationship between compressive strength and flexural strength is established. The influence of age on the parameter a in the equation is analyzed, and the parameter a increases with the increase of the age.

1. 引言

2. 试验

2.1. 试验原材料

2.2. 试验配合比

Table 1. Ratio calculation

2.3. 试件制备

1-1 1-2

Figure 1. Test piece preparation

2.4. 试验方法

2-1 2-2

Figure 2. Test piece mechanical properties measuring instrument

3. 试验结果

3-1 3-2

Figure 3. Test piece damage and crack shape

Table 2. Compressive strength and flexural strength

4. 抗压强度与抗折强度之间的换算关系

${f}_{t}=0.376{f}_{cu,m}-8.565\left({R}^{2}=0.574\right)$ (1)

Table 3. Compressive-reflex strength relationship

Figure 4. Relationship between compressive strength and flexural strength of PVA-DSECC

5. 龄期对抗压强度-抗折强度关系的影响

$a=0.00011x+0.37245\left({R}^{2}=0.81757\right)$ (2)

Table 4. The value of the parameter a to be determined

Figure 5. Relationship between age and parameter a

6. 结论

1) 提出抗压-抗折强度关系式；

2) 分析龄期对关系式中参数a的影响，结果表明，参数a随着龄期的增长而增大；

3) 提出参数a与龄期的函数关系式。

[1] 徐涛智, 杨医博, 梁颖华, 郭文瑛. 聚乙烯醇纤维增韧水泥基复合材料研究进展[J]. 混凝土与水泥制品, 2011(6): 39-44.

[2] Kojima Sakata, N., Kanda, T. and Hiraishi, M. (2004) Application of Directsprayed ECC for Retrofitting Dam Structure Surface-Application for Mi-Taka-Dam. Concrete Journal, 42, 135-139.

[3] Li Victor C. 高延性纤维增强水泥基复合材料的研究进展及应用[J]. 硅酸盐学报, 2007, 35(4): 531-536.

[4] Khan, M.I., Fares, G. and Mourad, S. (2017) Optimized Fresh and Hardened Properties of Strain Hardening Cementitious Composites: Effect of Mineral Admixtures, Cementitious Composition, Size, and Type of Aggregates. Journal of Materials in Civil Engi-neering, 29, No. 10.

[5] 韩冠生, 车佳玲, 李权威, 马彩霞, 刘海峰. 沙漠砂PVA-ECC材料力学性能试验研究[J]. 施工技术, 2018, 47(3): 27-31.

[6] Che, J.L., Li, Q.W., Lee, M.G. and Wang, D. (2017) Experimental Research on Mechanical Properties of Desert Sand Steel-PVA Fiber Engineered Cementitious Composites. Journal of Functional Materials, 24, 584-592.
https://doi.org/10.15407/fm24.04.584

[7] 蔡正咏, 李世绮. 路面水泥混凝土抗折强度的经验关系[J]. 中国公路学报, 1992(1): 14-20.

[8] 刘海峰, 马菊荣, 付杰, 等. 沙漠砂混凝土力学性能研究[J]. 混凝土, 2015(9): 80-83.

[9] ACI Committee 318. (2011) Building Code Requirement for Structural Concrete (ACI318-11) & Com-mentary. American Concrete Institute, Michigan.

[10] CEB-FIP. (1990) Model Code for Concrete Structure: CEB-FIP International Recommendations. Paris.

[11] 杨文科. 试论抗压与抗折的辨证关系及综合值的概念[J]. 混凝土, 2003(8): 13-16 + 33.

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