Tensile behavior of synthetic fiber-reinforced strain-hardening cement-based composite (SHCC) after freezing and thawing exposure
Tensile behavior of synthetic fiber-reinforced strain-hardening cement-based composite (SHCC) after freezing and thawing exposure
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DOI：
10.1016/j.coldregions.2011.02.002
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发表时间：
2011-06
影响因子：
4.1
通讯作者：
H. Yun;Sun-Woo Kim;Young-Oh Lee;K. Rokugo
中科院分区：
文献类型：
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作者：
H. Yun;Sun-Woo Kim;Young-Oh Lee;K. Rokugo
应变硬化水泥基复合材料(SHCC)与普通纤维增强水泥基复合材料(FRCC)不同，因为它们具有拉应力-应变行为，表现出伪应变硬化伴随着多个裂纹。小型高强混凝土材料在各种土木工程项目中作为建筑材料已经成为一种有吸引力的可能性。冻结-解冻循环是在寒冷环境中成功应用小型碳氢化合物的一个严重问题。本文描述了在受控环境中快速冻融暴露前后小鼠肝细胞癌的直接拉伸性能。本研究的主要目的是提供有关冻融循环对小细胞肺癌材料拉伸性能影响的全面实验室数据。用聚乙烯醇(PVA)和超高相对分子质量聚乙烯(PE)对小肝癌进行增强处理。在高强混凝土中，PVA和PE的总纤维增强比例分别为2.0%和1.5%。制作直径为100 mm、高度为200 mm的小肝癌圆柱体试件，进行直接拉伸强度试验。研究中使用的冻融试验遵循韩国工业标准(KS)F 2456的程序A(冷冻和在水中解冻)中的建议，该程序类似于ASTM C 666程序A，包括200个冻融循环。200次冻融循环试验结果表明，冻融循环对高强混凝土的拉伸响应影响不大。随着冻融循环次数的增加，SHCC材料在单调和循环轴向加载下的抗拉强度增加，而拉伸应变能力降低。这一现象在PVA-SHCC材料中非常明显。
Strain-hardening cement-based composites (SHCC) are distinguishable from ordinary fiber-reinforced cement-based composites (FRCC) because they have a tensile stress versus strain behavior that exhibits pseudo strain-hardening accompanied by multiple cracking. SHCC materials have become an appealing possibility as building materials in a wide variety of civil engineering projects. Freeze–thaw cycles pose a serious problem for the successful application of SHCCs in cold environments. This paper describes the direct tensile properties of SHCC before and after rapid freezing and thawing exposure in a controlled environment. The primary objective of this research is to provide comprehensive laboratory data on the influences of freeze–thaw cycles on the tensile performance of SHCC materials. The SHCC specimens used in the present study were reinforced with polyvinyl alcohol (PVA) and ultra-high molecular weight polyethylene (PE). The total percentages of fiber reinforcement in the SHCCs with PVA and PE were 2.0% and 1.5%, respectively. Cylindrical SHCC specimens with a diameter of 100mm and height of 200mm were made and tested for direct tensile strength. The freeze–thaw testing used in the study followed the recommendations found in Procedure A (frozen and thawed in water) of Korean Industrial Standard (KS) F 2456, which is similar to the ASTM C 666 Procedure A, and included 200 freeze–thaw cycles. The test results for freezing and thawing within 200 cycles indicated that the freeze–thaw cycles had a slight effect on the tensile response of the SHCCs. By increasing the number of freeze–thaw cycles, the tensile strength of the SHCC materials under monotonic and cyclic axial loading increased, while the tensile strain capacity decreased. This phenomenon is noticeable for PVA-SHCC materials.