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弹性橡胶混凝土压、弯变形性能试验研究
Experimental Study on Deformation Characteristic of Elastic Rubberized Concrete Under Compressive and Flecxural Loading
2008年第2期
橡胶混凝土;应力-应变全曲线;荷载-挠度曲线;全曲线拟合方程
Rubberized Concrete; Stress-Strain curve; Load-Deflection curve; Simulated stress-strain equation
2008年第2期
1000-4637(2008)02-06-05
国家自然科学基金项目(50778039),江苏省自然科学基金项目(BK2007111)
王婧一,王立燕,张亚梅
东南大学江苏省土木工程材料重点实验室,南京 211189

王婧一,王立燕,张亚梅

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摘 要:对普通混凝土、橡胶混凝土及橡胶纤维混凝土进行了单轴受压及四点弯曲荷载作用下变形性能的试验研究,得到了各组混凝土的单轴受压应力-应变全曲线及弯曲荷载作用下的荷载-挠度曲线,并对单轴受压应力-应变全曲线进行了拟合,得出了全曲线方程及拟合参数。结果表明,橡胶及橡胶纤维混凝土单轴受压应变峰值分别是普通混凝土的1.74和1.92倍,弯拉荷载作用下的极限挠度分别达到0.66mm和0.80mm,折压比分别是普通混凝土的1.45和1.64倍。说明橡胶及纤维的掺入大大提高了普通水泥混凝土的韧性及变性性能。 Abstract: The deformation of the ordinary concrete, rubberized concrete and fiber reinforced rubberized concrete under uniaxial compression and four-point flexure is studied by tests, and the stress-strain curves under uniaxial compression and the load-deflection curve under four-point flexure are obtained. Then the complete stress-strain curves are analyzed and compared theoretically, and the simulated stress-strain equations are established. The results show that the strain at ultimate stress of rubberized concrete and fiber reinforced rubberized concrete under uniaxial compression is 1.74 and 1.92 times of the ordinary concrete respectively, and the ultimate deflection of rubberized concrete and fiber reinforced rubberized concrete under flexure is of 0.66mm and 0.80mm respectively, while the ordinary is only of 0.32mm. The ratio of flexural strength to compression strength of rubberized concrete and fiber reinforced rubberized concrete is 1.45 and 1.64 times of the ordinary concrete. The results also show that the addition of rubber and fiber has greatly improved the toughness and deformationness of the ordinary cement concrete.
英文名 : Experimental Study on Deformation Characteristic of Elastic Rubberized Concrete Under Compressive and Flecxural Loading
刊期 : 2008年第2期
关键词 : 橡胶混凝土;应力-应变全曲线;荷载-挠度曲线;全曲线拟合方程
Key words : Rubberized Concrete; Stress-Strain curve; Load-Deflection curve; Simulated stress-strain equation
刊期 : 2008年第2期
DOI :
文章编号 : 1000-4637(2008)02-06-05
基金项目 : 国家自然科学基金项目(50778039),江苏省自然科学基金项目(BK2007111)
作者 : 王婧一,王立燕,张亚梅
单位 : 东南大学江苏省土木工程材料重点实验室,南京 211189

王婧一,王立燕,张亚梅

摘要
参数
结论
参考文献
引用本文

摘   要:对普通混凝土、橡胶混凝土及橡胶纤维混凝土进行了单轴受压及四点弯曲荷载作用下变形性能的试验研究,得到了各组混凝土的单轴受压应力-应变全曲线及弯曲荷载作用下的荷载-挠度曲线,并对单轴受压应力-应变全曲线进行了拟合,得出了全曲线方程及拟合参数。结果表明,橡胶及橡胶纤维混凝土单轴受压应变峰值分别是普通混凝土的1.74和1.92倍,弯拉荷载作用下的极限挠度分别达到0.66mm和0.80mm,折压比分别是普通混凝土的1.45和1.64倍。说明橡胶及纤维的掺入大大提高了普通水泥混凝土的韧性及变性性能。

Abstract: The deformation of the ordinary concrete, rubberized concrete and fiber reinforced rubberized concrete under uniaxial compression and four-point flexure is studied by tests, and the stress-strain curves under uniaxial compression and the load-deflection curve under four-point flexure are obtained. Then the complete stress-strain curves are analyzed and compared theoretically, and the simulated stress-strain equations are established. The results show that the strain at ultimate stress of rubberized concrete and fiber reinforced rubberized concrete under uniaxial compression is 1.74 and 1.92 times of the ordinary concrete respectively, and the ultimate deflection of rubberized concrete and fiber reinforced rubberized concrete under flexure is of 0.66mm and 0.80mm respectively, while the ordinary is only of 0.32mm. The ratio of flexural strength to compression strength of rubberized concrete and fiber reinforced rubberized concrete is 1.45 and 1.64 times of the ordinary concrete. The results also show that the addition of rubber and fiber has greatly improved the toughness and deformationness of the ordinary cement concrete.

关键词:
橡胶混凝土;应力-应变全曲线;荷载-挠度曲线;全曲线拟合方程
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(1) 橡胶颗粒取代砂的体积掺量为25%时,既能达到路用混凝土的抗折强度要求,同时又有良好的变形性能。
(2) 橡胶及纤维的掺入,明显降低了普通水泥混凝土的脆性,提高了混凝土的韧性。单轴受压试验结果表明,橡胶及橡胶纤维混凝土峰值应变分别是基准混凝土的1.74和1.92倍,曲线的下降段平缓。弯曲试验结果表明,橡胶及橡胶纤维混凝土的极限挠度分别达到0.66mm和0.80mm(相对应的普通混凝土的极限挠度仅为0.32mm),折压比则分别是普通混凝土的1.45和1.64倍。
(3) 单轴受压应力-应变全过程上升和下降段可以分别用多项式和有理分式拟合。上升段的参数a反映了混凝土的弹性变形能力;下降段的参数α反映了混凝土破坏过程的缓急。拟合结果表明橡胶及橡胶纤维混凝土上升段较基准混凝土略低一些。橡胶及橡胶纤维混凝土破坏过程缓慢且呈延性破坏。
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