Performance evaluation for struclural applicalions of fiber reinforced mortar showing tensile resistance and fine cracks

纤维增强砂浆结构应用的抗拉和细裂纹性能评价

• 批准号: 18360208
• 负责人: ROKUGO Keitetsu
• 金额: $ 10.71万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360208/
• 关键词: Concrete; Fiber reinforced mortar; Crack; Structural application; Performance evaluation

The properties of High Performance Fiber Reinforce Cement Composites (HPFRCC) showing fine cracks and tensile resistance were investigated to accelerate the applications.1. Material performance and evaluation methodsA portable tension testing apparatus for HPFRCC was proposed The remarkable effects of the specimen thickness on the cracking strength and tensile strength were not recognized. The smaller specimens showed the larger cracking strength, tensile strength and ultimate tensile strain. A method of direst tension testing on dumbbell specimens fabricated using beam pieces sawed from blocks was proposed. When an increase in the number of fanned and troweled surfaces, under which fibers tend to be oriented, the tensile strength and the ultimate strain increased. The tensile creep strain after formation of cracks increased with an increase in both the crack number and the crack width HPFRCC not only without cracks but also with multiple fine cracks had a good freeze-thaw resistance.2. Member performance and structural applicationsThe effects of the amount of steel reinforcement and the cover thickness on the crack number and width of reinforced HPFRCC beams were small. Wheel running tests in water on HPFRCC overlaid on a steel deck plate revealed that HPFRCC soon deteriorated due to the induced high water pressure inside fine cracks. To avoid the deterioration, it was pointed out to be important to reduce the water pressure in cracks and to make the structure watertight, where the water does not penetrate into the interface between HPFRCC and the steel deck plate by the sufficient draining The resifts of this study have been adopted in the recommendation (draft) for the design and construction of HPFACC, which was published by Japan Society of Civil Engineers.

为促进高性能纤维增强水泥复合材料的推广应用，开展了高性能纤维增强水泥复合材料(HPFRCC)的性能研究。材料性能及评价方法提出了一种便携式高性能碾压混凝土拉伸试验机，未发现试件厚度对其抗裂强度和抗拉强度的显著影响。较小的试件表现出较大的开裂强度、拉伸强度和极限拉应变。提出了一种对由块材制成的哑铃试件进行直接拉伸试验的方法。当纤维倾向于取向的扇形和刮板表面的数量增加时，拉伸强度和极限应变增加。裂缝形成后的拉伸蠕变应变随着裂缝数量和裂缝宽度的增加而增大，HPFRCC不仅没有裂缝，而且有多条细裂缝，具有良好的抗冻融性能。配筋量和保护层厚度对加固高强混凝土梁裂缝数量和宽度的影响较小。钢桥面铺装高性能碾压混凝土在水中的车轮运行试验表明，由于细小裂缝内部诱发的高水压，高性能碾压混凝土很快就会恶化。为了避免这种恶化，指出了降低裂缝中的水压，使结构不透水，通过充分排水使结构不渗入HPFRCC与钢板之间的界面是很重要的。本研究的残留物已被日本土木工程师学会公布的HPFACC设计与施工建议(草案)所采纳。

项目成果

Direct tension testing method for strain-hardening fiber-reinforced cement-based composites (SHCC) using dumbbell specimens

使用哑铃试样的应变硬化纤维增强水泥基复合材料（SHCC）的直接拉伸测试方法

• 发表时间: 2007
• 期刊: Nonlocal Modeling of Failure of Materials
• 作者: Keitetsu;ROKUGO;Hideaki;NISHIMATSU;Hisaya;KATO;Yuichi;UCHIDA
• 通讯作者: UCHIDA

Infiuence of cyclic loading on tensile behavior of cracked zone in HPFRCC(in Japanese)

循环荷载对HPFRCC裂纹区拉伸性能的影响（日文）

• 发表时间: 2006
• 期刊: Proc. of the Japan Concrete Institute Vol.28, No.1
• 作者: Tomohiro;HATA;Tadashi;INAGUMA;Akihiro;KASHIWAGI;Keitetsu;ROKUGO
• 通讯作者: ROKUGO

曲げおよび引張試験によるポリプロピレン繊維補強モルタルの繊維補強効果の評価

通过弯曲和拉伸试验评价聚丙烯纤维增强砂浆的纤维增强效果

• 发表时间: 2006
• 期刊: コンクリート工学年次論文集 Vol.28, No.1
• 作者: 六郷恵哲;横田弘;坂田昇;関田徹志;加藤久也;山本基由
• 通讯作者: 山本基由

複数微細ひび割れ型繊維補強セメント複合材料の引張性能と試験装置

多微裂纹纤维增强水泥复合材料拉伸性能及测试设备

• 发表时间: 2006
• 期刊: コンクリート工学年次論文集 Vol.28, No.1
• 作者: 六郷恵哲;横田弘;坂田昇;関田徹志;加藤久也;山本基由;水田武利;森山守
• 通讯作者: 森山守

HPFRCC梁の曲げ耐力と一軸引張特性の関係に関する研究

HPFRCC梁抗弯强度与单轴拉伸性能关系研究

• 发表时间: 2007
• 作者: 森山守;林承燦;内田裕市;六郷恵哲;稲熊 唯史
• 通讯作者: 稲熊 唯史