深圳大学学报理工版

以橡胶钢纤维再生骨料混凝土(crumb rubber and steel fiber reinforced recycled aggregate concrete,RSRAC)为研究对象,探讨橡胶掺量对其断裂性能的影响. 设计了6组试件,包括5组不同配合比的RSRAC(橡胶体积分数分别为0、4%、8%、12%和16%)和1组不含橡胶的钢纤维原生骨料混凝土试件,每组含3个尺寸为100 mm×100 mm×515 mm带切口的小梁试件. 基于三点弯曲断裂试验,得到了RSRAC的荷载-挠度曲

This paper addresses the fracture behavior of crumb rubber and steel fiber reinforced recycled aggregate concrete(RSRAC). An experimental study was conducted on the effects of rubber content on the fracture behaviors of RSRAC. 6 specimens of 150 mm×150 mm×515 mm were cast, including five RSRAC groups with different ratio of rubber content(rubber content being respectively 0, 4%, 8%, 12% and 16% by volume substitution of sand)and one group nature aggregate concrete(NAC)without rubber. Each group contained three specimens. Based on a three-point bending test, the curves of load-deflection and load-crack mouth opening displacement were obtained, and both the fracture toughness and fracture energy were calculated. The results indicate that both the fracture toughness and fracture energy firstly increases and then decreases with the increase of the rubber content, and the rubber content is recommended to be 8% to provide the better fracture behavior for RSRAC.

引言
1 试验设计
2 结果及分析
3 结论

图1 试件所用材料的外观形态<br/>Fig.1 (Color online)Appearance of materials

图1 试件所用材料的外观形态
Fig.1 (Color online)Appearance of materials

表1 材料配合比<br/>Table 1 Mix proportions单位:kg/m3

表1 材料配合比
Table 1 Mix proportions单位:kg/m3

$图2 三点弯曲断裂测试示意图(单位: mm)<br/>Fig.2 (Color online)Schematic illustration of three-point bending fracture tests(unit: mm)$

图2 三点弯曲断裂测试示意图(单位: mm)
Fig.2 (Color online)Schematic illustration of three-point bending fracture tests(unit: mm)

图3 试件断裂面<br/>Fig.3 (Color online)Fracture cross-section of specimen

图3 试件断裂面
Fig.3 (Color online)Fracture cross-section of specimen

图4 荷载-挠度曲线<br/>Fig.4 (Color online)Curves of P-δ

图4 荷载-挠度曲线
Fig.4 (Color online)Curves of P-δ

$表2 试验试件的断裂能<br/>Table 2 Values of fracture energy$

表2 试验试件的断裂能
Table 2 Values of fracture energy

图5 不同橡胶掺量的断裂能<br/>Fig.5 (Color online)Fracture energy with different rubber content

图5 不同橡胶掺量的断裂能
Fig.5 (Color online)Fracture energy with different rubber content

图6 荷载-CMOD曲线<br/>Fig.6 (Color online)Curves of P-CMOD

图6 荷载-CMOD曲线
Fig.6 (Color online)Curves of P-CMOD

图7 不同橡胶掺量试件的断裂韧度<br/>Fig.7 (Color online)Fracture toughness with different rubber contents

图7 不同橡胶掺量试件的断裂韧度
Fig.7 (Color online)Fracture toughness with different rubber contents

$表3 断裂韧度计算参数及断裂韧度值<br/>Table 3 Calculated parameters and values of fracture toughness$

表3 断裂韧度计算参数及断裂韧度值
Table 3 Calculated parameters and values of fracture toughness

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备注

引言

1 试验设计

2 结果及分析

3 结论

期刊信息

备注

引言

1 试验设计

2 结果及分析

3 结 论

期刊信息

3 结论