建置及應用資料庫以發展台灣自充填混凝土潛變預測公式

Developing Taiwan's Self-Compacting Concrete Creep Prediction Formula Based on the Establishment and Application of Database

廖昱霖(Yu-Lin Liao)

指導教授 ： 陳振川

國立臺灣大學/工學院/土木工程學研究所/碩士(2018年)

https://doi.org/10.6342/NTU201803358

摘要

工程設計應考慮強度、變形與耐久性三方面，但台灣的結構設計中變形與耐久性問題常常被忽視。台灣目前自充填混凝土工程設計均依照搗實混凝土規範設計，依循國外規範修訂，但在各地區之組成材料、配比均有所差異，且搗實混凝土與自充填混凝土也存在著明顯的工程性質差異。綜合以上，直接使用國外規範勢必會嚴重影響混凝土結構物變形與耐久性的設計及評估。
世界針對混凝土潛變收縮已有長期的試驗與研究發展，而自充填混凝土經過近二十多年研究發展已在台灣工程上普遍使用，然而其變形特性仍待深入探討。本研究先依國際格式蒐集國內外各自充填混凝土潛變資料，建立「自充填混凝土潛變資料庫」。通過自充填混凝土資料庫與搗實混凝土資料庫交叉比對與文獻探討，找出自充填混凝土配比有高膠結材量、低骨膠比、低水膠比、高總粒料量等特性；再經透過國內與國外自充填混凝土資料分析與文獻探討，找出台灣自充填混凝土有高取代率、高砂率、高骨膠比、高細粒料量等特性；最後經過Principal Component Analysis (PCA)的參數分析判別出砂率及粗細粒料量、漿體量、骨膠比、總粒料量為配比中重要參數。
本研究經評估比對後選用Model B4修正而來之Model B4-TW潛變預測公式為基礎，針對自充填混凝土特性及本土化特性進行修正。修正內容主要為漿體量造成變形影響、砂率造成之變形影響、乾燥收縮變化造成乾燥潛變之影響，最後提出適用於台灣自充填混凝土的潛變預測公式。另外，因台灣搗實混凝土資料庫中爐石與飛灰混凝土之潛變資料量不足造成爐石與飛灰的行為無法確切掌握，亦導致本研究本土化特性中高取代率修正上的困難，故本研究也指出未來加強實驗研究之建議。

關鍵字

自充填混凝土 ； 長期變形 ； 潛變 ； 資料庫

並列摘要

The strength, deformation and durability should be considered in engineering design, but the problems of deformation and durability are usually ignored in Taiwan’s structural design. At present, the design of Self-Compacting Concrete (SCC) projects in Taiwan are all designed according to Vibrated Concrete’s (VC) codes which are revised from foreign countries, but there are differences in the composition and proportion of the materials in various regions, and obvious differences between the Vibrated Concrete and Self-Compacting Concrete in engineering properties. Above all, the use of foreign codes will seriously affect the design and evaluation of deformation and durability of concrete structures.
Tests and researches on the creep and shrinkage of concrete have been developed over several decades at various places around the world, and Self-Compacting Concrete has been widely used in Taiwan engineering after nearly 20 years of research and development. However, its deformation characteristics still needs more investigation. In this study, the data of creep deformation in Taiwan and abroad were collected follows the framework and parameters of the Northwestern University (NU) database to establish Taiwan’s Self-Compacting Concrete creep database. First, through the comparison be-tween the Self-Compacting Concrete database and Vibrated Concrete database, it is found that the proportion of the Self-Compacting Concrete has the characteristics of high cementing material weight, low aggregate cementing ratio, low water-cementing ratio and high total aggregate weight. Second, through the analysis of Taiwan and foreign Self-Compacting Concrete data, it is found that Self-Compacting Concrete in Taiwan has the characteristics of high replacement rate, high sand ratio, high aggregate cementing ratio and high fine aggregate weight. Finally, Through the Principal Component Analysis, it is found that sand ratio, fine and coarse aggregate weight, total aggregate weight, cementing material weight are the important parameter in the mixture.
Based on the Model B4-TW creep prediction formula which was modified by Model B4, this study revised the characteristics of Self-Compacting Concrete and the localization. The modification is mainly about the effect of high volume of cementing material weight and high sand ratio, as well as the effect of drying shrinkage changes on the drying creep. In addition, Due to the lack of data for slag and fly ash concrete creep in the Taiwan database, the behavior of slag and fly ash cannot be investigated accurately, which leads to the difficulty in correcting the high replacement rate in the localization of this study. Therefore, suggestions for further experiments are proposed to promote the formulation of prediction formulae.

並列關鍵字

Self-Compacting Concrete ； prediction ； creep ； database

參考文獻

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