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首页> 外文期刊>Journal of advanced concrete technology >Prediction of Drying Shrinkage Cracking of Eco-efficient Steel Chip Reinforced Cementitious Composite Considering Tensile Creep
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Prediction of Drying Shrinkage Cracking of Eco-efficient Steel Chip Reinforced Cementitious Composite Considering Tensile Creep

机译:考虑拉力蠕变的生态高效钢片增强水泥基复合材料干缩开裂的预测

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This paper reports on the characteristics of drying shrinkage and creep of steel chip reinforced cementitious composite (SCRCC). In this study, first, four restrained wall specimens made of normal mortar and SCRCC with various numbers of steel reinforcing bars (4 or 10) were prepared to compare drying shrinkage characteristics. The specimens were re-strained on the rigid laboratory floor so that shrinkage cracks were induced. The drying shrinkage strains were measured by the contact gauge method and compared with unrestrained small specimens. The number of cracks was simultane-ously observed. Second, bond tests were prepared to evaluate the bond characteristics between the SCRCC and the steel bar. Third, creep tests were performed to improve the accuracy of the analysis of the drying shrinkage behavior. Twelve block specimens were made and a constant flexural load was applied for 7, 14, and 28 days. The observed shrinkage strains and creep strains of SCRCC were modeled according to CEB-FIP Model Code 1990. These models were incor-porated with bond computation between the SCRCC and the steel bar to predict the number of drying shrinkage cracks. The computed equivalent number of cracks based on the shrinkage strain model, the creep model, and the bond model derived from a pull-out test generally agreed with the test results.
机译:本文报道了钢屑增强胶凝复合材料(SCRCC)的干缩和蠕变特性。在这项研究中,首先,准备了四个用普通砂浆和SCRCC制成的约束墙样本,并用不同数量的钢筋(4个或10个)来比较干燥收缩特性。将样品在刚性实验室地板上重新拉伸,从而引起收缩裂纹。通过接触规方法测量干燥收缩应变,并将其与不受约束的小样品进行比较。同时观察到裂纹的数量。其次,准备粘结测试以评估SCRCC与钢筋之间的粘结特性。第三,进行蠕变测试以提高干燥收缩行为分析的准确性。制作十二个块状样品,并在7、14和28天施加恒定的弯曲载荷。根据CEB-FIP模型代码1990对观察到的SCRCC的收缩应变和蠕变应变进行建模。将这些模型与SCRCC和钢筋之间的粘结计算结合起来,以预测干燥收缩裂纹的数量。根据收缩应变模型,蠕变模型和拉拔试验得出的粘结模型计算出的等效裂纹数通常与试验结果一致。

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