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Proposed classification of HPFRC composites based on their tensile response

机译：基于拉伸响应的HPFRC复合材料的建议分类

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摘要

The tensile response of fiber reinforced cement (FRC) composites can be generally classified in two distinct categories depending on their behavior after first cracking, namely, either strain-hardening or strain-softening. Within the strain-softening category, one can distinguish between deflection-hardening and deflection-softening behavior. Several standard tests (ASTM, JCI, RILEM) are available to assess the characteristics of mostly strain-softening FRC composites through bending tests, but no standard test is currently available to characterize strain-hardening response in tension. Such composites have been described as high performance FRC or HPFRC composites. In this paper a proposal is put forth to characterize the response of strain-hardening FRC composites based on the results of direct tensile tests. The classification is based on several parameters which include a minimum value of elastic modulus, a minimum value of peak strain after first cracking, and the tensile strength level. While one of the key obstacles remains, that is, to develop a realistic and meaningful tensile test standard, some requirements on minimum specimen size, fiber size and aggregate size are also suggested.
机译：纤维增强水泥（FRC）复合材料的拉伸响应通常可以根据其在第一次开裂后的行为分为两种不同的类别，即应变硬化或应变软化。在应变软化类别中，可以区分挠曲硬化和挠曲软化行为。有几种标准测试（ASTM，JCI，RILEM）可通过弯曲测试来评估大多数应变软化FRC复合材料的特性，但目前尚无标准测试可表征张力中的应变硬化响应。此类复合材料已被描述为高性能FRC或HPFRC复合材料。本文提出了基于直接拉伸试验结果表征应变硬化FRC复合材料响应的建议。该分类基于几个参数，包括弹性模量的最小值，第一次开裂后的峰值应变的最小值和拉伸强度水平。尽管仍然存在主要障碍之一，即要制定现实而有意义的拉伸试验标准，但还建议了对最小样品尺寸，纤维尺寸和集料尺寸的一些要求。

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