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研究生:林明政
研究生(外文):Ming-Cheng Lin
論文名稱:含波索蘭材料高性能混凝土之配比技術及力學性質研究
論文名稱(外文):The Mix Design Technology and Property Measurement of High Performance Concrete with Pozzolans
指導教授:沈得縣沈得縣引用關係
指導教授(外文):Der-Hsien Shen
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:營建工程技術研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:英文
論文頁數:213
中文關鍵詞:波所蘭材料高性能混凝土配比技術力學性質
外文關鍵詞:PozzolansHigh Performance ConcretePropertioning TechnologyMechanical properties
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本研究係含波索蘭材料高性能混凝土配比技術及力學性質全程研究計畫之第二期。本研究主要目的針對飛灰、爐石粉及矽灰等三種波索蘭材料選擇較理想之混凝土配比技術,除比較各種含波索蘭材料高性能混凝土之巨微觀性質與力學行為外,並探討各種波索蘭材料相互間彼此摻用拌製高性能混凝土之模式。研究時,掌握高性能混凝土高流動性及高強度之要求,設坍度25±2cm及28天抗壓強度560kg/cm2以上作為混凝土配比設計之依據。首先考慮波索蘭材料取代方式及細骨材率等材料因素,採用 ACI配比設計法及最小孔隙率配比設計法進行試拌,拌製出合乎要求之高性能混凝土,然後利用抗壓、抗彎、抗剪及破壞韌性等力學試驗,再利用微觀分析技術進行現象觀察及機理解說,並推探討力學行為之關係模式。
研究結果發現:在本研究中以修正ACI配比設計法及最小孔隙率配比設計法,經試拌及適當調整配比均可拌製出達到符合高性能混凝土品質之要求。含非單一種波索蘭材料高性能混凝土,以修正ACI配比設計法所得之配比,其流動性較最小孔隙率配比設計法所得之配比為緩慢,坍度及流度值亦較低。爐石粉、飛灰、矽灰等波索蘭材料,對高性能混凝土之坍度流度等皆有正面之幫助,若以等量添加對工作度之效益而言,其排序為爐石粉>飛灰>矽灰。
在相同水膠比、要求相同工作性及材料比例之條件下,添加爐石粉及飛灰對高性能混凝土之早期硬固力學性質有降低之趨勢,但添加矽灰對高性能混凝土之早期硬固力學性質有正面之幫助。將其中兩者以適當比例取代水泥或細骨材,則有相互抵消之作用。故早期強度,以等量添加對之效益而言,矽灰>不取代>爐石粉>飛灰。爐石粉、飛灰、矽灰等波索蘭材料,對長期高性能混凝土之晚期硬固力學性質皆有正面之幫助,以等量添加對應之效益而言,矽灰>爐石粉>飛灰。
This study is based on results of past studies, a comparison on the microstructure and mechanical properties of various pozzolans will be conducted to select a relatively ideal proportioning technology of HPCs with fly ash,blast refurnace slag and silica fume.It will also study models of various mixtures of HPC with pozzolans.To control high fluidity and high strength requirements of HPC, slump will be set at 25±2℃, and 28 days compressive strength at above 560kg/cm2 to serve as basis for mix design for concrete. First material factors such as method of replacing pozzolans and rate of fine aggregate shall be considered before adopting the ACI mix design method and minimum void mix design method to produce HPC that meet requirements.
After which, mechanical tests such as compressive strength, flexural strength, shear strength and fracture toughness and micro-analysis technology shall be conducted to observe and explain its mechanical theory as well as study related models of mechanical behaviors. Results of study showed that under revised ACI mix design method and minimum void mix design metnhod,if appropriate factors were considered, compressive strength and workability can be adjusted to meet requirements of high performance concrete,Under revised ACI mix design method, fluidity of HPC with non-unitary pozzolans is relatively small compared with fluidity obtained in minimum void mix design method. Likewise, slump and flow values are also relatively small. Pozzolans such, as blast furnace slag fly ash silica fume have a positive impact in areas relating to slump and fluidity of HPC. In terms of workability benefits under equivalent ratios blast furnace slag > fly ash > silica fume. Under similar water cement ratio ,similar workability and materials ratio,HPCs with blast furnace slag and fly ash has a reducing effect on the strength of HPC at the early stage.
On the other hand,HPC with silica fume has an absolutely positive, slag or fly ash and silica fume were gathered and replaced with cement or fine aggregate,it will have a mutually offsetting effect.As such, in terms of strength benefits at the early stage under equivalent ratio, silica fume > blast furnace slag> fly ash.HPC with blast furnace slag, fly ash and silica fume has a positive effect on the long term strength of HPC.Under equivalent mixtures,silica fume > blast furnace slag >fly ash.
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