Binding Mechanism and Durability of Concrete Based on Alkali-Activated Granulated Blast Furnace Slag/Metakaolin Blends

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Project title

Code/計畫編號

MOST104-2221-E274-002-MY2

Translated Name/計畫中文名

鹼激發爐石/偏高嶺土混凝土膠結機理與耐久性之研究

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=11579031

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Co-Investigator(s)

Jiang-Jhy Chang

Bugetid/研究經費

773千元

ResearchField/研究領域

土木水利工程
防災工程

鹼激發爐石與偏高嶺土之硬化機制完全不同於波特蘭水泥，爐石與偏高嶺土膠結材料的鹼激發條件很類似，但反應產物卻不同。爐石主要成分為矽和鈣，鹼激發爐石硬化機制為鹼－礦渣水泥的水化反應，主要產物為C-S-H 膠體；偏高嶺土主要成分為矽和鋁，鹼激發偏高嶺土硬化機制為地工聚合物的土壤聚合反應，主要產物為矽鋁基膠體。鹼激發膠結材料目前仍處於發展中階段，不同的材料成分與不同的鹼液配製都可能產生不同的結果，尤其鹼激發複合材料(爐石/偏高嶺土)之膠結機制、反應產物、力學性質、耐久性與微觀結構等，仍需要更多的基礎研究並建立長期的實驗資料。本計畫共分二年，分年度研究目的分述如下：第一年(104年8月~105年7月) (1) 蒐集國內外鹼激發材料之文獻與資料，對鹼激發爐石/偏高嶺土反應機制進行探討； (2) 利用矽酸鈉、氫氧化鈉調製不同比例鹼液，進行鹼液激發不同比例爐石/偏高嶺土砂漿試體新拌性質試驗（凝結時間、流度）、硬固性質試驗（抗壓強度、乾燥收縮量測、吸水率、孔隙率、初始表面吸水速率）、高溫試驗與微觀分析（掃描式電子顯微鏡、X光繞射分析）； (3) 評估不同養護溫度對鹼激發不同比例爐石/偏高嶺土砂漿試體硬固性質與微觀性質的影響； (4) 比較不同比例爐石/偏高嶺土、液膠比、鹼模數比、Na2O濃度對鹼激發爐石/偏高嶺土砂漿特性與微觀性質的影響，為後續相關研究建立基礎；第二年(105年8月~106年7月) (1) 利用砂漿試體之試驗結果，建立鹼激發不同比例爐石/偏高嶺土混凝土配比設計流程，獲致鹼激發爐石/偏高嶺土混凝土之最佳組合配比； (2) 進行鹼液激發不同比例爐石/偏高嶺土混凝土試體之新拌性質試驗、硬固性質試驗、耐久性與微觀分析； (3) 評估不同養護溫度對鹼激發不同比例爐石/偏高嶺土混凝土試體硬固性質與微觀性質的影響； (4) 比較鹼激發爐石/偏高嶺土混凝土與卜特蘭水泥混凝土之新拌性質、物理性質、力學性質、耐高溫、耐久性與微觀性質之差異性，提升日後鹼激發爐石/偏高嶺土混凝土應用的深度與廣度。 The hardened mechanism of cementitious materials obtained by alkaline activation of slag/metakaolin is absolutely different from that of ordinary Portland cement. The synthesis conditions for alkali-activated ground granulated blast furnace slag (GGBFS) and metakaolin (MK) are quite similar, but their reaction products are quite different. Alkali activation of slag is a model of ( Si + Ca) system, having C-S-H as the main reaction products, and geopolymer is a kind of (Si + Al) cement with metakaolin as the main material, and the reaction products are zeolite like polymer. 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. This study focuses on binding mechanism, properties and durability of alkali-activated slag/metakaolin mortars and concrete, and is planned to perform by 2 years and the objectives of this study include the following: The 1st year (from August, 2015 to July, 2016) 1. Explore the reaction and interaction mechanism for alkali-activated slag/metakaolin by searching and collecting related literatures and data distributed journal papers, conference papers and research reports. 2. Sodium silicate and sodium hydroxide will be used as the alkali-activators to alkali activation of slag/metakaolin, and testing methods, such as fresh concrete property tests (setting time, fluidity), hardened property tests (compressive strength, dry shrinkage, absorption rate, porosity, and initial surface absorption tests), high temperature resistance test and microstructure analysis (scanning electron microscopy; SEM and X-ray diffraction; XRD) will be conducted on the alkali-activated slag/metakaolin mortars. 3. Clarify the effects of curing temperature on the hardened and microstructure properties of alkali-activated slag/metakaolin mortars. 4. Evaluate the effects of slag/metakaolin ratio, liquid/binder ratio, alkali modulus ratio, and Na2O concentration on the characteristics and microstructure properties of alkali-activated slag/metakaolin mortars to establish a basis for follow-up studies. The 2nd year (from August, 2016 to July, 2017) 1. To establish the mix design process of alkali-activated slag/metakaolin concrete based on the results of the alkali-activated slag/metakaolin mortar and to obtain the optimal mix design of concrete; 2. Fresh properties, physical properties, mechanical properties, durability and microstructure properties of alkali-activated slag/metakaolin concrete will be investigated. 3. Clarify the effects of curing temperature on the hardened and microstructure properties of alkali-activated slag/metakaolin concrete. 4. The difference of fresh properties, physical properties, mechanical properties, high temperature resistance, durability and microstructure properties for alkali-activated slag/metakaolin concrete will be compared with those of portland cement concrete, to promote the follow-up studies and construction engineering applications;

Keyword(s)

鹼激發爐石/偏高嶺土
膠結機制
力學性質
耐久性
微觀特性
alkali-activated slag/metakaolin
binding mechanism
mechanical properties
durability
microstructure characteristics

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Binding Mechanism and Durability of Concrete Based on Alkali-Activated Granulated Blast Furnace Slag/Metakaolin Blends

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