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dc.contributorTsung Yanen_US
dc.contributorYONG NIAN CHENen_US
dc.contributor.advisorHao-Ji Chenen_US
dc.contributor.authorChang, Yung-Hsuanen_US
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Carino, "Code Provisions for High Strength Concrete Strength-Temperature Relationship at Elevated Temperatures", Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mailstop 8611, Gaithersburg, Maryland 20899-8611. 【32】 L.T. Phan, "Fire Performance of High-Strength Concrete: A Report of the State-of-the-Art", NISTIR 5934, Building and Fire Research Lab``oratory, National Institute of Standards and Technology, (Gaithersburg, Maryland, December 1996). 【33】 L.T. Phan and N.J. Carino, "Review of mechanical properties of HSC at elevated temperature", Journal of Materials in Civil Engineering, American Society of Civil Engineers, v.10 (1) (February, 1998) 58-64. 【34】 L.T. Phan and N.J. Carino, "Mechanical Properties of High Strength Concrete at Elevated Temperatures", NISTIR 6726, Building and Fire Research Laboratory, National Institute of Standards and Technology, (Gaithersburg, Maryland, March 2001). 【35】 U. 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Carino, D. Duthinh, and E. Garboczi, (eds), National Institute of Standards and Technology, Gaithersburg, Md., 69-73(1997). 【41】 Z.P. Bažant, Analysis of pore pressure: thermal stresses and fracture in rapidly heated concrete, Proc, In Workshop on Fire Performance of High-Strength Concrete, NIST Spec. Publ. 919, L. T. Phan, N. J. Carino, D. Duthinh, and E. Garboczi, (eds), National Institute of Standards and Technology, Gaithersburg, Md., 155-164(1997). 【42】 W.J.Copies, "The Spalling of Normal Weight and Lightweight Concrete Exposed to Five",1987. 【43】 涂耀賢,“以燒失量試驗法推測混凝土受火害程度之研究”,碩士論文,國立台灣工業技術學院營建工程研究所,1991。 【44】 S.Y.N.Chan, G.F. Peng and M Anson. “Residual strength and pore structure of high-strength concrete and normal-strength concrete after exposure to high temperatures”. Cement and Concrete Composites, 21, pp. 23-27(1999).zh_TW
dc.description.abstract本研究旨在探討高溫對高性能混凝土(high performance concrete,簡稱HPC)殘餘抗壓強度及孔隙壓力之影響,所配製的混凝土共有三種系列,分別為純水泥混凝土(ordinary Portland concrete,簡稱OPC)、飛灰-水泥混凝土(fly ash/cement-concrete,簡稱FC)以及爐石-水泥混凝土(slag/cement-concrete,簡稱SC),以進行火害殘餘抗壓強度試驗及孔隙壓力試驗;其中,OPC作為控制組,FC及SC則為對照組。試驗變數計有水膠比(water-to-binder ratio by weight,簡稱w/b)、卜作嵐材料取代率、齡期、養護條件、火害試驗溫度及延時。w/b共分為0.30、0.45及0.60三種;FC中,飛灰取代水泥的重量百分比分為15%、30%及45%三種;而SC中,爐石取代水泥的重量百分比分為30%、50%及70%三種。 在91天齡期時,將不同水汽含量的殘餘抗壓強度試驗試體(100 × 200 mm)置於高溫電爐,以10℃/min速率加熱,直至所需溫度(計有500℃、700℃及900℃三種),達到最高溫度後,其延時又分為兩種情況,即0 hr及1 hr。經設計最高火害試驗溫度火害作用後的試體,先使其自然冷卻至常溫23℃,再將已冷卻的火害後試體置於抗壓試驗機承壓軸的正中心以進行加載,以求得試體之殘餘抗壓強度。另方面,將不同齡期的孔隙蒸氣壓力試驗試體(100 × 200 mm)放入高溫電爐內,以1℃/min的速率加熱至900℃。每個試體均在不同位置埋設壓力管(連至壓力計)及感溫線,以量測其孔隙壓力及溫度。 試驗結果顯示,在火害溫度低於500℃時,試體不論是何種狀態,FC及SC之耐火性較OPC者優異。因飛灰和爐石可與CH發生卜作嵐反應,可消耗混凝土中的CH,而提升混凝土在常溫與高溫時的強度與耐久性。當火害溫度高於500℃時,FC中以取代率45%者的相對強度比最佳,而在SC中以取代率30%者的相對強度比最佳。至於孔隙蒸氣壓力試驗結果,由受熱混凝土內部溫度之歷時曲線,可闡述其水汽傳輸過程。尤其是,混凝土內部水汽轉變及傳輸現象對其溫度及孔隙蒸氣壓力的發展具有特殊的影響。大體而言,當試體溫度介於100℃~150℃之範圍時,其內部的孔隙壓力呈現出顯著增加的情形,而其內所含自由水的蒸發及水汽傳輸也正是發生在此溫度範圍。此外,當試體溫度介於150℃~170℃之範圍時,其內部孔隙壓力的亦與其內化學鍵結水的釋放有關。zh_TW
dc.description.abstractThis research aimed to investigate the residual compressive strength and pore pressure of high performance concrete (HPC) after exposure to high temperature. Three series of concrete (i.e. plain Portland cement concrete (PC), fly ash/cement concrete (FC), and blast-furnace slag/cement concrete (SC)) were prepared to measure their residual strengths and pore pressures. Among them, OPC without mineral admixtures were prepared at the same water to binder ratio (w/b) as the reference. The experimental variables included w/b ratio, percentage of cement replacement (by mass) by mineral admixtures, curing ages, curing conditions, and duration of high temperature. The ratios of w/b used were 0.30, 0.45, and 0.60. The cement replacement by fly ash were 15, 30, and 45% in FC, while by slag were 30, 50, and 70% in SC. At the age of 91 days, residual strength specimens (100 × 200 mm cylinders) with different moisture contents were placed in an electrical furnace with heat applied at a rate of 10℃/min to high temperatures ranging from 500℃ to 900℃. Specimens were then allowed to cool down to room temperature in the furnace and tested for residual compressive strengths. On the other hand, pore pressure specimens (100 × 200 mm cylinders) with different curing ages were placed in an electrical furnace with heat applied at a rate of 1℃/min to 900℃. All pore pressure specimens were instrumented with pressure gages and thermocouples at different depths to measure pore pressure and temperature developments in the specimen. Test results showed that concretes containing fly ash and slag showed better performance particularly at temperatures below 500℃ as compared with the plain cement concretes. This better performance was due to the reaction of these mineral admixtures with calcium hydroxide (CH), which enhances the strength and durability both at normal and high temperatures by reducing the CH content. For exposure to 500℃, the mix containing 45% fly ash replacement gave the maximum relative strength ratio in the FC, while the mix containing 30% slag replacement showed the maximum relative strength ratio in the SC. As for the results of the pore pressure test, it was found that internal concrete temperature histories could provide insights into the moisture transport process in HPC. In particular, the transformation and mass transport of moisture in concrete have a unique influence on its temperature and pore pressure developments. In general, noticeable rise in pore pressure occurs when concrete reaches the temperature range of 100℃ to 150℃, which coincides with the vaporization of free water and transport of water vapor. Besides, in the concrete''s temperature range of 150℃ and 170℃, the change of pore pressure occurs is relative to the release of chemically bound water.en_US
dc.description.tableofcontents中文摘要 I ABSTRACT II 總目錄 III 表目錄 V 圖目錄 VI 論文照片 IX 第一章 緒論 1 1.1 前言 1 1.2 研究目的 1 1.3 研究方法 2 第二章 文獻回顧 5 2.1 水泥 5 2.1.1水泥的成分 5 2.1.2水泥的分類 5 2.2 卜作嵐材料 5 2.2.1卜作嵐材料的定義 5 2.2.2飛灰 6 2.2.3爐石 8 2.3 混凝土的組成 9 2.4 混凝土內部成分與結構 9 2.4.1水化產物種類 10 2.4.2孔隙結構 10 2.4.3混凝土內部的水分 11 2.5 高溫下混凝土的性質變化 12 2.5.1混凝土化學性質變化 12 2.5.2高溫對混凝土裂縫的影響 13 2.5.3混凝土的殘餘強度 14 2.5.4混凝土的爆裂 15 第三章 試驗規劃 26 3.1 試驗變數 26 3.2 試驗材料 27 3.3 試體製作 27 3.3.1試驗配比 27 3.3.2試體尺寸 27 3.3.3試體拌製及養護 28 3.4 試驗方法 28 3.5 試驗儀器及設備 29 第四章 試驗結果分析與討論 36 4.1抗壓強度試驗結果 36 4.1.1混凝土之抗壓強度分析 36 4.1.2飛灰混凝土之抗壓強度發展趨勢 37 4.1.3爐石混凝土之抗壓強度發展趨勢 39 4.1.4飛灰與爐石混凝土之抗壓強度差異 40 4.2火害試驗結果 42 4.2.1試體含水量之試驗結果 42 4.2.2抗壓強度及含水量對火害爆裂率之影響 42 4.2.3飛灰混凝土火害後之相對強度比 46 4.2.4爐石混凝土火害後之相對強度比 51 4.2.5飛灰及爐石混凝土火害後相對強度比之比較 54 4.3 孔隙壓力試驗結果 55 4.3.1混凝土孔隙壓力量測 55 4.3.2混凝土溫度與孔隙壓力之發展 56 4.3.3孔隙壓力試驗結果之分析 58 第五章 結論 105 5.1混凝土抗壓強度部分 105 5.2火害試驗部分 106 5.3孔隙壓力部分 107 參考文獻 109zh_TW
dc.subjectHigh Temperatureen_US
dc.titleEffects of High Temperature on the Residual Compressive Strength and Pore Pressure of High Performance Concreteen_US
dc.typeThesis and Dissertationzh_TW
Appears in Collections:土木工程學系所


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