Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/14416
標題: 以粗骨材含量為主軸之混凝土波速與強度關係曲線之建立
Establishing the Correlation between the Pulse Velocity and Concrete Strength Using the Coarse Aggregate Content as Key Parameter
作者: 高國峰
Kao, Kuo-Fong
關鍵字: Concrete
混凝土
Pulse Velocity
Concrete Strength
the Coarse Aggregate Content
波速
強度
粗骨材含量
出版社: 土木工程學系
摘要: 目前研究成果皆指出,對於單一配比之混凝土其波速與強度間之關係性良好,故波速可準確地用來評估特定配比混凝土之強度,但是在配比改變之情況下,波速與強度間之關係則隨之改變,因此混合各種配比所建立之波速與強度關係曲線,則呈現明顯之變異,相同波速可以對應到好幾種強度值,導致波速量測法無法普遍應用於混凝土強度之評估。 本論文旨在研究波速與強度間之關係如何隨混凝土配比變化而改變之規則。將針對單一骨材來源之普通混凝土,其粗骨材用量為1170、1040、910、780 kg/m3 、水泥糊體(Paste)佔混凝土體積之變化量為33% 、36%,及水灰比變化為0.4、 0.5 、0.6 、0.7,總計有32組配比,分別於材齡達 3、7 、14 、28天時,進行三顆試體之波速量測與抗壓試驗,故總共需製作32×12=384顆圓柱試體(mold size:Φ×h=0.10m×0.20m)。 由實驗發現,波速將隨著骨材含量增加而有增快之趨勢,另外,水灰比之降低,有助於減少硬化後水泥砂漿內部殘餘孔隙,增加水泥砂漿之緻密性,可提高混凝土之波速,而普通混凝土強度則最主要受水灰比控制,但波速受粗骨材用量所影響,故波速與強度間之關係可由骨材用量與水灰比當作串聯媒介,使波速與強度有較明確之關係性,做為波速評估混凝土強度之基礎。
The objective of the thesis is to study how the correlation between the pulse velocity and the concrete strength varies with concrete mixtures. The results obtained from many previous studies show that the change in concrete mixtures will result in significant variation of the correlation between the concrete strength and the pulse velocity. If all the experimental data are put together in a graph for concrete with various mixtures, a certain pulse velocity will be associated with many corresponding strength values. This hinders the use of the pulse velocity for evaluating concrete strength. There is a need to find out how the correlation between the pulse velocity and the concrete strength varies with concrete mixtures. In this thesis, the variables in concrete mixtures include the amount of coarse aggregate(1170, 1040, 910, 780 kg/m3), paste volumes (33%, 36%) and water-cement ratios (0.7, 0.6, 0.5 and 0.4). There are 32 concrete mixtures. Twelve specimens are prepared for each concrete mixture. There are 384 (32*12=384) specimens to be cast altogether (mold size: Φ×h=0.10m×0.20m). Concrete cylinders are cured in water at 23°C and tested at 3, 7, 14 and 28 days. The experimental results show that the pulse velocity increases with the increase in the aggregate content. On the other hand, the reduction in water-cement ratios enhances the pulse velocity of concrete. The strength of ordinary concrete is mainly controlled by the water-cement ratios. However, the pulse velocity is influenced significantly by the coarse aggregate content. It is found that the coarse aggregate content and the water-cement ratios can serve as media to establish a better relationship between the pulse velocity and concrete strength.
URI: http://hdl.handle.net/11455/14416
Appears in Collections:土木工程學系所

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