Experimental Studies on Dynamic Response of Hardened Cement Paste

SP-175: Concrete and Blast Effects Pub Date : 1998-12-01 DOI:10.14359/5923

D. Yankelevsky, Itzhak Avnon

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Abstract

This jpaper is concerned with the description and explanations of Hardened Cement Paste (HCP) response to dynamic (explosive) loading. An experimental testing technique has been developed to study the dynamic cracking of HCP samples, using cylindrical explosive microcharges. Following the initiation of the microcharge, radial cracks propagate and measurements of their growth may be conducted. Procedures to predefine the crack path have been investigated, like preparation of linear grooves along the sample. Predefining the crack path enabled relatively simple measurements of its propagation velocity. The dynamic crack propagation velocity was found to be relatively low, within the range of 70-200 m/sec. (about an order of magnitude lower than the theoretical value). The dynamic HCP failure process was found to be usually of multicrack type. Studies of microcharge intitiation near a samples boundary provided insight into the development of scabbing cracks and of their interaction with the radial cracks propagating towards the boundary. It has been found that crack interaction is strongly dependent on the relationship between the stress wave velocity and the crack propagation velocity.

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硬化水泥浆体动力响应试验研究

本文对硬化水泥浆体在动力(爆炸)荷载作用下的响应进行了描述和解释。本文提出了一种利用圆柱形炸药微装药研究HCP试样动态开裂的实验测试方法。随着微装药的产生，径向裂纹扩展，可以对其扩展进行测量。已经研究了预先定义裂纹路径的程序，例如沿样品制备线性凹槽。预先定义裂纹路径可以相对简单地测量其传播速度。动态裂纹扩展速度较低，在70 ~ 200 m/sec之间。(大约比理论值低一个数量级)。发现HCP的动态失效过程通常是多机架型的。在试样边界附近的微电荷激发的研究提供了对结痂裂纹的发展及其与向边界扩展的径向裂纹的相互作用的深入了解。研究发现，裂纹的相互作用强烈依赖于应力波速度与裂纹扩展速度之间的关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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SP-175: Concrete and Blast Effects

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