建立臺灣普通及摻料混凝土強度及彈性模數時間成長函數研究

Establishment of Time Dependent Functions for Ordinary and Pozzolanic Concrete Compressive Strength and Modulus of Elasticity in Taiwan

10.6849/SE.202203_37(1).0002

王映捷(Ying-Chieh Wang)；廖文正(Wen-Cheng Liao)

飛灰 ； 爐石 ； 強度 ； 彈性模數 ； 時間函數 ； fly ash ； slag ； strength ； elastic modulus ； time function

結構工程

37卷1期（2022 / 03 / 01）

25 - 49

繁體中文

混凝土是由粒料、水泥、礦物摻料、水等材料，依配比設計產生之複合材料；又混凝土結構物之生命週期需考量安全性及長期服務性，其硬固後體積會受外力作用而變化，如因環境乾燥所產生的收縮、受持續載重產生潛變等現象，皆會影響結構物之長期行為。混凝土彈性模數受組成材料等因素影響甚鉅，彈性模數的增長也會直接影響收縮潛變的評估，但因為各地所使用之組成材料不甚相同，因此有臺灣本土化之預測模型是非常重要的。目前臺灣已經有本土化之收縮潛變模型，但缺乏混凝土強度及彈性模數之時間函數。有鑑於彈性模數、強度在工程應用上的重要性，以及近年來添加飛灰、水淬高爐爐碴粉等摻料混凝土被廣泛使用，因此本研究將從臺灣混凝土收縮潛變資料庫出發，以7種不同水灰比之普通混凝土及固定水膠比為0.42之6種飛灰、爐石取代量之摻料混凝土，分別配合3、7、14、28、56、91、180天的齡期，進行抗壓及彈性模數試驗，提出普通混凝土之強度及彈性模數預測式及時間成長函數，再進一步修正摻料混凝土之相關模型，除了可供修正臺灣本土化收縮潛變模型外，也能提供工程界預測使用。

Concrete is a widely used construction material composed of aggregate, cement, water, mineral admixture in a specific proportion. Not only safety, long-term serviceability is also the main consideration for buildings and infrastructures made of concrete. The volume of concrete changes over time, such as shrinkage and creep, and all the above influence the long-term serviceability. The elastic modulus of concrete, mainly determined by composition of concrete, directly affects shrinkage and creep behaviors of concrete. However, because materials vary from different resources, a localized prediction model is essential to account for characteristics of concrete in Taiwan and this specific prediction model shall involve localized time function of strength and elastic modulus as well. In view of the importance of elastic modulus and strength in practical applications, and in recent years, the addition of fly ash and water-quenched blast furnace slag in concrete has been widely used, so this research also investigates the shrinkage and creep test data from the database. A comprehensive experimental program, including compression and elastic modulus tests for seven different water-to-cement ratios of ordinary concrete and six different fly ash and slag replacement ratios of water-to-binder ratio of 0.42 for 3, 7, 14, 28, 56, 91 and 180 days, were conducted. The prediction models of time function for strength and elastic modulus for ordinary and fly ash/slag concrete in Taiwan are proposed for further modification of shrinkage and creep model and practical applications.

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