Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10376
標題: 探討不同齡期飛灰混凝土波速與強度之成長關係曲線
Study of the relationship between the pulse velocity and strength development of fly-ash concrete at various ages
作者: 黃瑋倫
Huang, Wei-Lun
關鍵字: 飛灰;fly-ash;波速;強度;成長率;pulse velocity;strength;development
出版社: 土木工程學系所
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Wimal Suaris and Viraj Fernando, “Ultrasonic Pulse Attenuation as Measure of Damage Growth during Cyclic Loading of Concrete”, ACI Materials Journal, May-June 1987, Vol.84, pp.185-193. 43. T.T. Wu and T. F. Lin, “The Stress Effect on the Ultrasonic Velocity Variation of Concrete under Repeated Loading”, ACI Materials Journal, Vol.95, No.5, September-October 1998, pp.519-524. 44. Andersen Johannes and Nerenst Poul, “ Wave Velocity in Concrete” Journal of ACI, Vol.48, No.8, April 1952,pp.613-636. 37 45.R. Jones, “Testing of Concrete by an Ultrasonic Pulse Technique”, RILEM Int. Symp. On Nondestructive Testing of Materials and Structures, Paris Vol.1, Paper No.A-17, January 1954, pp.137, RILEM Bull. No.19, 2nd part, November 1954. 46. M.F. Kaplan, “Effects of Incomplete Consolidation on Compressive and Flexural Strength, Ultrasonic Pulse Velocity, and Dynamic Modulus of Elasticity of Concrete”, Journal of ACI, Vol.56, No.9, March 1952, pp.853-867. 47. 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摘要: 
本研究之目的在於探討不同齡期飛灰混凝土波速與強度之關係,並建立導電值與飽和度之關係,希冀能夠考慮混凝土含水狀態對波速之影響,再以飽和度修正波速準確地預估混凝土強度。本研究選用之飛灰混凝土之配比為飛灰取代15%水泥,砂率45%,兩種水泥糊體含量Vpaste=42%及Vpaste=36%,水灰比0.3、0.4、0.5、0.6、0.7,共計10種配比,用以建立UPV波速與強度之關係及導電值與飽和度之關係,並利用這兩種關係曲線預估混凝土之強度。
研究結果顯示,量測之混凝土波速若未經由飽和度對波速進行修正,推估強度誤差大約30%,透過HI-520含水量測定儀對混凝土量測所得到之導電值,經由導電值與飽和度之關係曲線及飽和度之差異對波速之影響,對波速進行飽和度修正,依此修正後之波速預估強度可有效的提升準確性,因此以應力波技術評估混凝土強度時,必須考慮混凝土含水量對波速之影響。

The purpose of this thesis is to study the relationship between the pulse velocity and compressive strength of fly-ash concrete at various ages. To investigate how the moisture state of concrete affects wave velocity, we establish the relationship between conductivity coefficient and the saturation degree of concrete, and then wave velocity adjustment due to various concrete saturation degrees can be made to accurately predict concrete strength. In this study, ten fly-ash concrete mixture proportions are used to make concrete specimens. The mixture proportions include 15% of fly ash to replace cement, a sand ratio of 45%, two cement paste volume ratios (Vpaste) of 42% and 36%, water-cement ratios of 0.3, 0.4, 0.5, 0.6,and 0.7. The specimens are used to establish the relationship between the UPV velocity and compressive strength. In addition, we also establish the relationship between conductivity coefficient and the saturation degree of concrete. Eventually, these two established relationship curves can be used to estimate concrete strength.
The experimental results show that compressive strength estimated by the measured wave velocity has an error of 30% without considering the effect of moisture content. We measure the concrete conductivity coefficient through the HI-520 water-content meter, and then determine the related concrete saturation degree used to modify the wave velocity. After modification of wave velocity in consideration of moisture content in concrete, the accuracy of the estimated compressive strength is improved significantly. This proves that it is necessary to consider the effect of concrete moisture on wave velocity when the stress wave technique is used to evaluate concrete strength.
URI: http://hdl.handle.net/11455/10376
其他識別: U0005-0708201215321200
Appears in Collections:土木工程學系所

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