早龄期混凝土抗裂性环形试验研究进展

发布时间：2018-02-26 07:23

本文关键词： 早龄期混凝土限制收缩破坏机理影响因素　出处：《力学与实践》2017年02期 　论文类型：期刊论文

【摘要】：早龄期混凝土极易在限制收缩条件下产生裂缝进而影响结构的安全性、耐久性和适用性,因此提供一种简单有效的方法来评估早龄期混凝土在限制收缩条件下的抗裂性,就显得非常重要.由于能够提供一定的约束刚度并易于实验室操作,限制收缩环形试验被广泛应用到混凝土在限制收缩条件下的抗裂性评估.主要从限制收缩环形试验的发展、破坏机理、影响因素三方面进行阐述.通过限制收缩环形试验进行不同目的的混凝土试验研究,推动了限制收缩环形试验的不断发展;破坏机理主要有最大拉应力理论以及基于断裂力学的断裂能机制预测混凝土的开裂;环形试验的影响因素主要有试件几何尺寸,边界条件,混凝土材料性能以及预制裂缝四个方面.最后介绍了一种椭圆环试验方法,可有效评估高约束度下混凝土的抗裂性.
[Abstract]:Early age concrete is easy to produce cracks under the condition of limited shrinkage, which will affect the safety, durability and applicability of the structure. Therefore, it provides a simple and effective method to evaluate the crack resistance of early age concrete under the condition of limited shrinkage. Because of its ability to provide certain restraint stiffness and be easy to operate in the laboratory, the restricted shrinkage ring test is widely used to evaluate the crack resistance of concrete under the condition of limited shrinkage, mainly from the development of the limited shrinkage ring test. The failure mechanism and influencing factors are expounded in three aspects. The concrete experimental research for different purposes is carried out by limiting shrinkage ring test, which promotes the continuous development of restricted shrinkage ring test. The failure mechanism mainly includes the theory of maximum tensile stress and the fracture energy mechanism based on fracture mechanics to predict the cracking of concrete. Finally, an elliptical ring test method is introduced, which can effectively evaluate the crack resistance of concrete under high constraint degree.
【作者单位】：大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家自然科学基金(51478083) 中央高校基本科研业务费(DUT14LK06)资助
【分类号】：TU528

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