Performance evaluation and structural applications of tensile strain-hardening-type high toughness cementitious composites

拉伸应变硬化型高韧性水泥基复合材料性能评价及结构应用

• 批准号: 16360219
• 负责人: ROKUGO Keitetsu
• 金额: $ 5.95万
• 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: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360219/
• 关键词: Concrete; Toughness; Strain-hardening; Cementitious composites; Structural applications; Performance evaluation; 高靭性

(1) Tensile behavior of DFRCC members with reinforcementThe tensile load-bearing capacity of steel reinforced DFRCC (Ductile fiber reinforced cement composites) members was the superposition of those of steel reinforcement and DFRCC, even with a low reinforcement content. Even if DFRCC had a low tensile deformability, the tensile deformability of the member increased due to steel reinforcement.(2) Cracking behavior of DFRCC under bending momentBending tests were carried out on DFRCC beams each having different specimen length. The area under the load-displacement curves up to the peak load point was proportional to the specimen length. Therefore, the dissipated energy per unit volume can be used as a parameter to indicate multiple cracks.(3) Behavior of DFRCC under cyclic loadingAfter an introduction of several bending cracks on RC beams by a static loading, DFRCC was placed by spraying on the beams. Fatigue tests of 17 million cycles were conducted on them. For beams with DFRCC layer on the surface, the crack width was kept to be narrow after fatigue tests.(4) Behavior of steel tubes covered with DFRCCBending tests were carried out on steel tube specimens covered with DRFCC. The crack width in DFRCC with spiral and axial rebars welded to the tubes was smaller,(less than 0.15m), and the number of cracks greater, than in steel fiber-reinforced or plain concretes for steel tube covering.(5) Development of lightweight DFRCC by adding bubblesDuctile lightweight mortars were developed by adding pre-foamed bubbles to DFRCC. Multiple fine cracks were observed on specimens in flexure. As the air content increased, the loads at the first crack and the peak decreased and the number of cracks increased.

(1)钢筋混凝土延性纤维增强水泥基复合材料（DFRCC）受拉承载力是钢筋和DFRCC的叠加，即使在低配筋率下也是如此。即使DFRCC具有低的拉伸变形能力，构件的拉伸变形能力由于钢筋而增加。(2)对不同试件长度的DFRCC梁进行了弯曲试验。载荷-位移曲线下的面积达到峰值载荷点与样本长度成正比。因此，单位体积耗散能可以作为多裂纹的表征参数。(3)循环荷载作用下DFRCC的性能在静态荷载作用下，钢筋混凝土梁上出现几个弯曲裂缝后，DFRCC被喷涂在梁上。对它们进行了1700万次循环的疲劳试验。对于表面具有DFRCC层的梁，疲劳试验后裂纹宽度保持较窄。(4)对DRFCC涂层钢管试件进行了弯曲试验。与钢纤维混凝土或钢管混凝土相比，螺旋钢筋和轴向钢筋焊接在钢管上的DFRCC的裂缝宽度较小（小于0.15m），裂缝数量较多。(5)掺气泡的轻质DFRC混凝土的研制在DFRC混凝土中掺加预发泡气泡，研制了延性轻质砂浆。在弯曲试样上观察到多个细裂纹。随着空气含量的增加，裂纹的初始载荷和峰值载荷减小，裂纹数目增加。

项目成果

複数微細ひび割れ型コンクリートにより被覆した鋼管の曲げ破壊性状とひび割れ性状

多重微裂纹型混凝土钢管弯曲断裂性能及开裂性能

• 发表时间: 2005
• 期刊: コンクリート工学年次論文集 Vol.27,No.1
• 作者: 山下賢司;藤元安宏;林承燦;六郷恵哲
• 通讯作者: 六郷恵哲

鋼床版補強用の高靭性セメント複合材料ECCの製造・施工技術に関する研究.

钢筋桥面板用高韧性水泥复合材料ECC制造及施工技术研究

• 发表时间: 2005
• 期刊: 土木学会論文集 No.805/VI-69
• 作者: 三田村浩;坂田昇;閑田徹志;平石剛紀;六郷恵哲
• 通讯作者: 六郷恵哲

Bending Failure Behavior and Crack Properties of Steel Tubes Covered with Multiple-Crack-Type Concrete

多重裂缝型混凝土钢管弯曲破坏行为及裂缝性能

• 发表时间: 2005
• 期刊: Preliminary Workshop Proc.of Int.Workshop on HPFRCC in Structural Applications (CD), Honolulu
• 作者: K.Yamashita;Y.Fujimoto;S.-C.Lim;K.Rokugo
• 通讯作者: K.Rokugo

特許「繊維補強された軽量セメント系硬化体」

专利：“纤维增强轻质水泥基硬化体”

• 发表时间: 2005

Measurement of Crack Opening Behavior within ECC under Bending Moment

弯矩作用下 ECC 内裂纹张开行为的测量

• 发表时间: 2005
• 期刊: Workshop Proc. of Int. Workshop on HPFRCC in Structural Applications (CD), Honolulu
• 作者: M.Kunieda;K Rokugo
• 通讯作者: K Rokugo