Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/15909
標題: 飛灰顆粒粗細對高性能混凝土抗壓強度及脆裂韌性之影響
Effects of Fly Ash Particle Size on Compressive Strength and Toughness of High Performance Concrete
作者: 謝忠麒
Shie, Jung-Chi
關鍵字: fly ash
飛灰
出版社: 土木工程學系所
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摘要: 本文旨在探討飛灰含量及顆粒粗細對高性能混凝土抗壓強度及破裂韌性(fracture toughness)之早期與晚期影響。試驗用之高性能混凝土採用水膠比0.35,飛灰取代水泥量有0%、10%及20%三種,飛灰細度分別為通過No.175、No.250及No.325篩等三種,並於齡期到達時進行試驗。本研究以三點彎矩試驗來測量預裂樑的最大載重,根據量測之載重與變形關係計算出破裂能量值(Gf)與極限應力強度因子(KSIC),以此來代表混凝土破裂韌性大小。最後也以場發式電子顯微鏡(SEM)觀察不同爐石細度、取代率、齡期之微觀差異。 試驗結果顯示,添加部分飛灰於高性能混凝土中,不論是取代10%或20%,對於晚期強度皆有明顯助益,其中又以取代10%者效果較佳;此外,添加細度較高之飛灰可得到較大之混凝土強度。不論在早、晚齡期,飛灰細度越高時,由於其填充效應與反應活性愈佳,混凝土破裂能量值(Gf)與極限應力強度因子(KSIC)有越大之趨勢。以飛灰取代水泥後,將造成混凝土晚齡期Gf值與KSIC值的顯著提昇;惟取代率不宜過大,因過大的取代率反而造成折減,因此建議以10%為宜。再者,混凝土破裂能量值及極限應力強度因子皆與抗壓強度有密切之關聯,其中又以破裂能量值較為直接,其線性迴歸之R2可達0.9543。 從微觀(SEM)來看,齡期56天時在水化反應與卜作嵐反應較完全之作用下,混凝土內部晶相結構更加緻密,孔隙孔徑較14天時小,平面結構持續形成,且有更多的C-S-H膠體產生,其界面結構較緻密,且微裂縫明顯減少。
The study aims to research the effect of the particle size of fly ash on the early and late age fracture toughness of high performance concrete (HPC). In all HPC mixtures, the water/binder ratio is 0.35; the cement replacement ratios are 0%, 10% and 20%; the particle sizes of fly ash have three types of passing through sieves No. 175, No. 250 and No. 325. Three-point-bending test was adopted to measure the load-deflection relations, the maximum loads and so on to get the fracture energy (Gf) and the critical stress intensity factor (KSIC). Finally, all of the specimens were investigated by the SEM microscope. The test results show that adding fly ash into HPC apparently enhances the late age strengths of HPC no matter what the replacement ratio is 10% or 20%. If the particle size is the same, the late age strength of concrete with 10% fly ash is higher than that with 20%. In addition, the smaller the particle size of fly ash the better the late age strengths. No matter what the age is, the HPC with the smaller fly ash always has higher development and values of GF and KSIC because of its well filling effect and pozzolanic reaction. At late age the GF and KSIC values of concrete with 10% fly ash are all higher than those with 20% fly ash. This result indicates that although the fly ash can improve the late age concrete properties, too much fly ash may be disadvantage to the concrete. For practical use, the replacement ratio 10% is therefore suggested. From the microstructure observation by SEM, the late-age concrete microstructures are all denser than their corresponding early-age concrete microstructures. At the late age (56days), the concrete microstructure has fewer holes, more plane structures, more C-S-H particles, and fewer cracks.
URI: http://hdl.handle.net/11455/15909
其他識別: U0005-3107200819445600
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-3107200819445600
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