A Study of Interaction Mechanism of Alkali-Activated Calcium-Silicate/Aluminosilicate-Based Cementitious on Durability and Microstructure of Concrete

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Project title

Code/計畫編號

NSC102-2221-E274-007

Translated Name/計畫中文名

鹼激發矽鈣基與矽鋁基膠結材料交互反應機理對混凝土耐久性與微觀特性之研究

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Co-Investigator(s)/共同執行人

紀茂傑(計畫主持人)

Department/Unit

吳鳳學校財團法人吳鳳科技大學消防學系

Website

https://www.grb.gov.tw/search/planDetail?id=3113478

Year

2013

Start date/計畫起

01-08-2013

Expected Completion/計畫迄

31-07-2014

Co-Investigator(s)

Wei-Chung Yeih

Bugetid/研究經費

491千元

ResearchField/研究領域

土木水利工程
防災工程

鹼激發矽鈣基與矽鋁基膠結材料之硬化機制完全不同於波特蘭水泥，矽鈣基與矽鋁基膠結材料的鹼激發條件很類似，但反應產物卻大不相同，其硬化機制可分為兩種模式：第一型為鹼－礦渣水泥的水化反應，主要產物為 C-S-H 膠體，矽和鈣為主要成分；第二型為地工聚合物的土壤聚合反應機制，主要產物為矽鋁基膠體，矽和鋁為主要成分。然而這種新的膠結材料目前仍處於發展中階段，不同的材料來源與不同的鹼溶液配製都可能產生不同的結果，仍需要更多的基礎研究並建立長期的實驗資料，提升日後鹼激發矽鈣基與矽鋁基膠結材料應用的深度與廣度以及降低材料成本。故本計畫研究目的如下：（1）釐清鹼激發矽鈣基與矽鋁基膠結材料之反應機理與交互作用機制，獲致最佳組合配比；（2）釐清不同矽鈣基與矽鋁基膠結材料組合、液膠比、鹼模數比、Na2O 濃度、養護溫度對鹼激發膠結材料混凝土新拌性質、物理性質、力學性質、耐火性、耐久性與微觀性質的影響，並與卜特蘭水泥混凝土進行比較，為後續相關研究與營建工程應用建立基礎；（3）計算鹼激發矽鈣基與矽鋁基膠結材料混凝土之成本效益、耗能與二氧化碳排放，作為日後評估其在營建工程上應用與使用效益的參考；（4）提供政府單位推動廢棄物再生利用與制定工業廢棄物處理或處置等相關措施之參考依據。The hardened mechanism of cementitious materials obtained by alkaline activation of different industrial by-products is absolutely different from that of ordinary Portland cement. The synthesis conditions for alkali-activated calciumsilicate-based and aluminosilicate-based are quite similar, but their reaction products are quite different. There are two models of alkali-activated cements, one is the case of activation of slag (Si + Ca) and the other is activation of fly ash (Si + Al). The major chemical product for alkali-activated slag is C-S-H gel while for alkali-activated fly ash it is amorphous hydrated alkali-aluminosilicate. So far, research works carried out in developing alkali-activated binders show that this new binder seems to have the potential to become an alternative to Portland cement. However, these binders are still at the early stage of development and need further research work to become technically and locally viable construction materials. The study of binding mechanism and properties of alkali-activated fly ash/slag mortars published on the Journal of Construction and Building Materials was carried out and some conclusions, such as the mixes of alkaline activators, the production of alkaline solutions and the physical and mechanical properties on the alkali-activated fly ash/slag mortars were obtained. According to the results of the study mentioned above, the objectives of this study include the following; 1. Clarify the reaction and interaction mechanism for alkali-activated calciumsilicate-based and aluminosilicate-based cementitious materials and to obtain the optimal combination ratio; 2. Clarify the effects of the calciumsilica-based and aluminosilicate-based cementitious materials, liquid/binder ratio, alkali modulus ratio, Na2O concentration, curing temperature on the fresh properties, physical properties, mechanical properties, fire resistance, durability and microstructures of alkali-activated fly ash/slag concrete and compare with portland cement concrete, to establish a basis for follow-up studies and construction engineering applications; 3. Calculate cost-effective, energy consumption and carbon dioxide emissions of alkali-activated fly ash/slag concrete, as a reference for future assessment of its effective application and use in construction projects; 4. Provide government agencies to promote waste recycling and the development of the industrial waste treatment or disposal, and other related measures of reference.

Keyword(s)

鹼激發
矽鈣基
矽鋁基
混凝土
耐久性
微觀特性
alkali-activated
calcium-silicate
aluminosilicate
concrete
durability
microstructure properties

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A Study of Interaction Mechanism of Alkali-Activated Calcium-Silicate/Aluminosilicate-Based Cementitious on Durability and Microstructure of Concrete

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