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研究生:魏子強
研究生(外文):TZU-CHIANG WEI
論文名稱:地震對新澆置飛灰混凝土(21MPa)強度性質之影響
論文名稱(外文):Effects of Earthquake Excitation on the Strength Properties of Newly Placed Fly Ash Concrete(21MPa)
指導教授:蘇人煇蘇人煇引用關係
指導教授(外文):Jen-hui Su
學位類別:碩士
校院名稱:逢甲大學
系所名稱:土木工程所
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:2008
畢業學年度:96
語文別:中文
論文頁數:77
中文關鍵詞:抗壓強度飛灰混凝土早齡期地震
外文關鍵詞:compressive strengthearly ageearthquakefly ash concrete
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本研究主要是探討地震對早齡期飛灰混凝土強度性質之影響。實驗中針對強度為21MPa之新澆置飛灰混凝土,於六種不同齡期(齡期6小時、8小時、14小時、1天、2天及3天)分別施加四種不同之最大地表加速度(0.05g、0.20g、0.33g、0.40g)所造成之影響;另外亦製作不經振動之控制組作比較分析,以探討地震對新澆置飛灰混凝土強度性質之影響。
實驗顯示於齡期2天以內承受四種等級之最大地表加速度振
動,其抗壓強度均會折損,而以齡期8小時最為嚴重,折損率最高可
達61%,然而經養護28天後,折損的強度均會有效回復;於齡期3
天時承受四種等級之最大地表加速度振動,其抗壓強度不受影響。此
外,於齡期1天以內承受四種等級之最大地表加速度振動,其彈性模
數均會折損,折損率最高可達19%,經養護28天後,折損的部份均
會有效回復;齡期2天時承受四種等級之最大地表加速度振動,其彈
性模數不受影響。於齡期2天以內承受四種等級之最大地表加速度振
動,其超音波波速均會折損,折損率最高可達25%,經養護28天後,
其折損的部份均會有效回復;齡期3天時承受四種等級之最大地表加
速度振動,其超音波波速不受影響。綜合觀之,無論在何種齡期下承
受四種等級之最大地表加速度振動,只要經養護28天後其抗壓強
度、彈性模數及超音波波速均不受影響。
This study discussed the effects of earthquake excitation on the strength properties of early-age fly ash concrete. In the experiment, four types of peak ground accelerations (0.05 g, 0.20g, 0.33g, 0.40g) were applied to the newly placed fly ash concrete with a strength of 21 MPa of six different ages (6 hours, 8 hours, 14 hours, 1 day, 2 days and 3 days), in order to find out the effects. In addition, a control group without vibration was used for comparison analysis to discuss the effects of earthquake excitation on the strength properties of newly placed fly ash concrete.
The experiment showed that when the concrete within age of 2 days suffered vibration from four types of peak ground accelerations, its compressive strength would be reduced and the concrete with an age of 8 hours was reduced seriously, which was up to 61%, but if it was cured for 28 days, the lost strength would effectively be recovered. The concrete with an age of 3 days suffered vibration from four types of peak ground accelerations, its strength would not be affected. In addition, the concrete within age of one day suffered vibration from four types of peak ground accelerations, its elastic modulus would be impaired, which could reach 19%. After 28 days of curing, the impairment could be recovered effectively. The concrete with an age of 2 days suffered vibrations from four types of peak ground accelerations, its elastic modulus would not be affected. The concrete within age of 2 days suffered vibration from four types of peak ground accelerations, its ultrasonic pulse velocity would be impaired, and the impair rate could be as high as 25 %. After curing for 28 days, its impaired part would be effectively recovered; while the concrete with an age of 3 days suffered vibration from four types of peak ground accelerations, its ultrasonic pulse velocity would not be affected. As a conclusion, when the concrete was under the vibration from four types of peak ground accelerations, regardless of the age, after curing for 28 days, its compressive strength, elastic modulus and ultrasonic pulse velocity were not affected.
摘要 I
Abstract III
目錄 IV
表目錄 VII
圖目錄 VIII
照片目錄 IX
第一章 緒論 1
1-1研究動機 1
1-2 研究目的與範圍 3
1-3 研究方法 4
第二章 文獻回顧 6
2-1 新澆置混凝土強度之成長 6
2-2 新澆置混凝土受振後之影響 7
2-3 新澆置飛灰混凝土強度之成長 9
2-4 新澆置飛灰混凝土(35MPa)受振後之影響 10
2-5 彈性模數 11
2-6 混凝土超音波波速與強度之探討 13
2-7 新拌飛灰混凝土之重覆振動 14
2-8飛灰對新拌混凝土性質之影響 15
2-9 混凝土中添加飛灰之作用 17
2-10 其他相關的文獻 19
第三章 試驗規劃與測析步驟 20
3-1 試驗材料 20
3-2 試驗設備 21
3-3 配比設計 23
3-4 飛灰混凝土凝結時間測析 24
3-5 模擬地震力 25
3-6 試體規劃 26
3-7 飛灰混凝土振動實驗及力學性質檢測 27
3-8 超音波波速量測 28
第四章 試驗結果之分析與討論 29
4-1 飛灰混凝土抗壓強度、彈性模數及超音波波速之誤差量分析 29
4-2 振動對新澆置飛灰混凝土抗壓強度之影響 31
4-2-1飛灰混凝土受振後抗壓強度之變化 31
4-2-2飛灰混凝土受振後養護至28天之抗壓強度變化 33
4-3 振動對新澆置飛灰混凝土彈性模數之影響 35
4-3-1飛灰混凝土受振後彈性模數之變化 35
4-3-2飛灰混凝土受振後養護至28天之彈性模數變化 36
4-4 振動對新澆置飛灰混凝土超音波波速之影響 37
4-4-1飛灰混凝土受振後超音波波速之變化 37
4-4-2飛灰混凝土受振後養護至28天之超音波波速變化 38
4-5 與其他研究之比較 39
第五章 結論與建議 40
5-1 結論 40
5-2 建議 42
參考文獻 43
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