不同鋼纖維型式與含量對超高性能混凝土抗彎性能之影響

EFFECT OF DISTINCT STEEL FIBER TYPES AND CONTENTS ON THE FLEXURAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE

10.6652/JoCICHE.202209_34(5).0004

賴怡君(Yi-Chun Lai)；李明輝(Ming-Hui Lee)；戴毓修(Yuh-Shiou Tai)

超高性能混凝土 ； 鋼纖維 ； 三分點抗彎試驗 ； 殘餘強度 ； ultra-high performance concrete ； steel fiber ； third-point loading ； residual strength

中國土木水利工程學刊

34卷5期（2022 / 09 / 01）

387 - 396

英文

超高性能混凝土（ultra-high performance concrete, UHPC）是一種先進的水泥基複合材料，與傳統混凝土相比，具有更高的力學和耐久性能。其中，採用不連續的鋼纖維對UHPC基體脆性的改善，及開裂後強度與韌性的提升有明顯地幫助，尤其是鋼纖維的型式及含量對UHPC的新拌與硬固性質影響甚鉅。本研究以兩款不同水灰比之配比，研究不同型式鋼纖維分別以含量為體積比1%和2%對超高性能混凝土（UHPC）抗彎行為之影響，試驗結果顯示，螺旋型鋼纖維過度握裹與反扭轉力矩會導致基體在纖維拔出前碎裂，因此降低了載重與變形能力，但整體而言，各種鋼纖維都隨著體積比的增加，對UHPC的抗彎強度與韌性有明顯提升。而UHPC殘餘強度之折減情況，鋼纖維體積比為1%時殘餘強度折減率均高於2%時，其中直線型鋼纖維的強度折減率最高，顯示在試體開裂後因直線型鋼纖維光滑的表面使握裹力不足，橋接效應較差，導致折減率也偏高。而螺旋纖維與彎鉤纖維等變形鋼纖維於淨撓度L/50處折減率均維持60%上下，凸顯出變形鋼纖維對UHPC開裂後能發揮較佳之橋接效應。

Ultra-high performance concrete (UHPC) is an innovative composite cementitious material with higher mechanical and durability properties. The use of discontinuous steel fibers has significantly contributed to the improvement of the brittleness of UHPC and the enhancement of post-cracking strength and toughness. Significantly, the type and content of steel fibers greatly influence the fresh and hardening properties of UHPC. This study investigated the effect of different steel fibers with volume ratios of 1% and 2% on the bending behavior of UHPC with two water- cement ratios. The test results show that over-bond and untwisting torque of twisted steel fibers would cause matrix damage before the fiber was pulled out, thereby reducing loading and deformation capacity. Overall, all types of steel fibers improved the flexural strength and toughness of UHPC with increasing volume fraction. In terms of strength reduction, the UHPC residual strength of 1% steel fibers is reduced by more than 2%. The reduction rate of straight steel fibers was the highest, which shows that the smooth surface of straight steel fiber caused insufficient bond force and bridging effect after cracking and caused a high reduction rate. While the strength reduction rate of deformed steel fibers, such as twisted and hooked fibers, remained about 60% at the net deflection of L/50, highlighting that the deformed steel fibers provided a better bridging effect on UHPC specimen cracking.

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