材料組成比例對超高性能纖維混凝土之工作性與力學性質之影響

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Title:	材料組成比例對超高性能纖維混凝土之工作性與力學性質之影響
Authors:	陳玥廷;YUEH-TING,CHEN
Contributors:	土木工程學系
Keywords:	超高性能纖維混凝土;工作性
Date:	2016-08-30
Issue Date:	2016-10-13 12:14:32 (UTC+8)
Publisher:	國立中央大學
Abstract:	超高性能纖維混凝土（Ultra high performance fiber reinforced concrete）為一種新型的水泥基工程材料，較傳統混凝擁有強化的強度、耐久性與韌性行為，然而材料之粒徑大小及不同形式的纖維皆會影響超高性能纖維混凝土之工作性，使得拌合與澆置困難，進而影響結構構件之性能。本文以研究超高性能纖維混凝土之工作性為旨，討論改變混凝土配比中矽砂、石英粉末與鋼纖維使用量，對工作性與力學性質的影響。實驗結果顯示，提高矽砂與石英粉末之使用量，皆能改善超高性能纖維混凝土之工作性，但會降低漿體帶動纖維之能力，而添加少量的鋼纖維能提升混凝土之工作性，但當纖維量提高為2%時，會造成工作性損失。力學性質的部分，本研究中所有配比之壓力強度皆可達120 MPa，開裂強度約為5 MPa～8 MPa，而添加2%纖維之極限拉力強度為6 MPa～10 MPa，達極限拉應力時之應變最高可達0.88%，超高性能纖維混凝土之壓力強度會隨石英粉末與矽砂的比例增加而降低，加入鋼纖維亦會使壓力強度下降，但添加2%纖維時之強度損失程度較僅使用1%纖維時低，在纖維含量較高時，石英粉末含量的增加，能明顯增強開裂強度與極限強度，且有明顯的應變硬化行為，顯示石英粉末能提高鋼纖維之效用，而矽砂含量對超性能混凝土之拉力強度之影響則十分有限，隨著矽砂量的提高，發生應變硬化行為之機會降低，顯示提高矽砂量會降低纖維之效用。研究結果認為，提高石英粉末比例，除了工作性佳之外，拉力性能之表現亦十分優異，僅對壓力強度造成些微損失，發展出在不大幅影響力學性能之前提下，能提供較好工作性之超高性能纖維混凝土。 ;Ultra high performance fiber reinforced concrete (UHPFRC) is a new cement-based material. It is more durable and has a higher strength than traditional concrete. The workability of UHPFRC will influence by the particle size and the type of steel fiber, cause the mechanical performance unstable. This study investigates the effect of varying percentages of silica sands and quartz powders on the workability and mechanical properties of the UHPFRC. The results show that increasing the amount of usage of silica sands and quartz powders is able to improve the workability of UHPFRC. But it make cause the loss of the fiber distribution ability. Adding a small amount of steel fiber can improve the workability of UHPFRC, but when the amount of fiber increase of 2%, will result in the loss of workability. In this research, the compressive stress of UHPFRC is up to 120 MPa. The first-cracking stress and the ultimate tensile stress with 2% fiber is about 5 MPa~8 MPa and 6 MPa~10 MPa. The strain at ultimate tensile stress is up to 0.88%. The compressive stress of UHPFRC will decreased with the proportion of silica sands and quartz powders increase. Adding steel fiber also cause the compressive stress loss, and the UHPFRC with 1% fibers will loss more strength than which that with 2% fibers. At higher fiber content and increased content of silica powder, it can enhance first-cracking stress and ultimate tensile stress significantly with strain hardening behavior, it shows that quartz powders can improve the effectiveness of steel fibers. On the other hand, the effect of silica sand content on tensile stress is limited. With the increase of the amount of silica sand, the probability of strain hardening is reduced, show that silica sands will reduce the effectiveness of fibers. The study concluded that increase the proportion of quartz powders not only improve the workability, but also enhance the toughness of UHPFRC. Developed the UHPFRC that with great workability and mechanical performance successfully.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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