鹼激發輕粒料對自充填混凝土性質影響之研究｜國立臺灣科技大學博碩士論文系統

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研究生：	Vu-An Tran Vu-An Tran
論文名稱：	鹼激發輕粒料對自充填混凝土性質影響之研究 Study of alkali-activated lightweight aggregate on the performance of self-consolidating concrete
指導教授：	黃兆龍 Chao-Lung Hwang
口試委員:	黃偉慶 Wei-Ching Hwang 鄭大偉 Ta-Wui Cheng 林仁益 Ren-Yih Lin 王和源 Her-Yung Wang 張大鵬 Ta-Peng Chang 陳君弢 Chun-Tao Chen 黃兆龍 Chao-Lung Hwang
學位類別：	博士 Doctor
系所名稱：	工程學院 - 營建工程系 Department of Civil and Construction Engineering
論文出版年：	2017
畢業學年度：	105
語文別：	英文
論文頁數：	133
中文關鍵詞：	Lightweight aggregate 、Lightweight concrete 、Self-consolidating concrete 、Alkali-activated material 、Fly ash 、Rice husk ash
外文關鍵詞：	Lightweight aggregate, Lightweight concrete, Self-consolidating concrete, Alkali-activated material, Fly ash, Rice husk ash
相關次數：	點閱：249 下載：0
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上一筆

本研究主要探討應用冷粘法旋轉造粒、低污染及節能的技術製造鹼激發輕質粒料（ALWA）。材料採用各種比例的飛灰高爐石粉（FA_GBFS）和稻殼灰渣高爐石粉（RHA_GBFS）的混合物，利用氫氧化鈉或與矽酸鈉激發而成。同時鹼激發輕質粒料（ALWA）也以80％飛灰和20％高爐石粉也加入發泡劑和表面處理。使用9種ALWA作為粗粒料，採用緻密配比(DMDA)方法設計的自充填混凝土（SCC）。進行了各種試驗，以評估高爐石粉量、養護時間、發泡劑量和表面處理對 ALWA性能的影響。此外，ALWA對SCC的工作性、機械性能和耐久性的影響，並根據相關國際標准進行評估。研究結果表明，高爐石粉量顯著影響ALWA的特性。7％的發泡劑為最佳濃度，對ALWA的性質有明顯積極影響。與表面未處理的ALWA相比，表面處理的ALWA具有更緻密的外殼微觀結構，所以強度更高，吸水率更低。所有SCC的流動性、粘度和通過能力，符合歐洲國家協會混凝土協會（EFNARC）要求。後期SCC的抗壓強度、劈裂強度和彈性模數與ALWA的固化齡期無關。使用發泡劑和ALWA的表面處理顯著影響SCC的強度。SCC使用表面處理的ALWA，降低後乾燥收縮率。SCC試樣的熱導率在飽和表面乾燥條件下為1.19〜1.5W/m.k，乾燥條件下為0.79〜1.22W/m.k。具有RHA_GBFS粒料的SCC與具有FA_GBFS粒料的SCC樣品相比，具有優異的熱電阻率。此外，所有28天試樣的電阻率和超音波速度值分別超過20kΩ.cm和3660m/s，滿足參考混凝土耐久性指標的最低要求。

This study investigated alkali-activated lightweight aggregate (ALWA) manufactured using cold-bonded agglomeration process, a relatively low-polluting, energy efficient method. The mixtures of fly ash- ground blast furnace slag (FA-GBFS) and rice husk ash- ground blast furnace slag (RHA-GBFS) with various ratios were activated using just sodium hydroxide or mixed with sodium silicate. ALWA of 80% fly ash and 20% ground blast furnace slag was produced with adding foaming agent and surface treatment. Moreover, 9 types of ALWA were used as coarse aggregate to produce self-consolidating concrete (SCC) designed by Densified Mixture Design Algorithm (DMDA) method. A variety of tests were conducted to evaluate the effects of slag amount, curing age, foaming agent and the surface treatments on the properties of the ALWA. Further, the effects of ALWA on the workability, mechanical properties, and durability of SCC are assessed based on the relevant international standards. The findings show that the slag mount significantly affected on characteristics of ALWA. The optimum concentration of foaming agent of 7% has clear and positive effect on the properties of ALWA. The surface-treated ALWA had the denser microstructure of outer shell that lead to the higher strength and lower water absorption of aggregate compared to surface-untreated ALWA. The flowability, viscosity, and passing ability of all SCC mixtures met European Federation of National Associations Representing for Concrete (EFNARC) requirements. At later age, compressive strength, splitting tensile strength, and modulus of elasticity of SCC were independent with the curing age of ALWA. Using foaming agent and surface treatment of ALWA significantly affects the strength of SCC. Using surface-treated ALWA for SCC reduced the drying shrinkage at later ages. The thermal conductivity of SCC specimens varied from 1.19 to 1.5 W/m.k in saturated-surface-dry condition and from 0.79 to 1.22 W/m.k in oven-dry condition. SCC with RHA-GBFS aggregate was superior in thermal resistivity compared to SCC samples with FA-GBFS aggregate. Furthermore, the electrical resistivity and the ultrasonic pulse velocity values for all of the 28-day specimens exceeded 20 kΩ-cm and 3660 m/s, respectively, satisfying the minimum requirements of the referenced concrete durability indices.

Abstract (in Chinese)    i
Abstract (in English)    ii
Acknowledgements    iv
Table of contents    v
List of tables    x
List of figures    xi
Notations and symbols    xv
Chapter 1 - Introduction    1
1 Motivation    1
2 Aim and objectives of the research    5
3 The flow chart of research organization    6
Chapter 2 - Literature review    9
1 Overview of using fly ash in cementitious material industry    9
2. Overview of using rice husk ash in cementitious material industry    13
3. Overview of using ground blast furnace slag in cementitious material industry    16
4. Overview of alkali-activated binder    18
5. Overview of using fly ash, rice husk ash, and ground blast furnace slag in manufacturing of lightweight aggregate    20
6. Overview of using LWA for production of LWC and SCC    27
Chapter 3 - Materials and experimental method    32
1 Material properties    32
1.1 Portland Cement, fly ash, ground blast furnace slag, and rice husk ash    32
1.2 Crushed sand    36
1.3 Superplasticizer and water    36
1.4 Sodium hydroxide and sodium silicate    37
2. Production of ALWA    38
3. Tests for lightweight aggregate    42
3.1. Specific gravity, water absorption, and unit weight    42
3.3. Strength    42
3.3.1. Crushing strength    42
3.3.2. Particle crushing strength    43
3.4. Microstructural analysis    44
4. Production of self-consolidating concrete    45
4.1. Densified mixture design algorithm method for SCC    45
4.1.1. Stage #1: proper materials selection    47
4.1.2. Stage #2: Optimizing the possible highest aggregate materials by packing    47
4.1.3. Stage #3: Concrete materials proportion    50
4.2. Sample preparation    53
5. Tests for self-consolidating concrete    54
5.1. Workability and unit weight tests of fresh self-consolidating concrete    54
5.2. Testing program of hardened self-consolidating concrete    59
5.2.1. Strength, dynamic modulus of elasticity, and ultrasonic pulse velocity of self-consolidating concrete    59
5.2.2. Drying shrinkage    61
5.2.3. Thermal conductivity    62
5.2.4. Electrical surface resistivity    63
Chapter 4 - Results and discussion    65
1. Properties of alkali-activated lightweight aggregate    65
1.1. Specific gravity and unit weight    65
1.1.1. Effect of ground blast furnace slag    65
1.1.2. Effect of foaming agent and surface treatment    66
1.2. Water absorption    68
1.2.1. Effect of ground blast furnace slag and curing age    68
1.2.2. Effect of foaming agent and surface treatment    71
1.3. Crushing strength    72
1.3.1. Effect of ground blast furnace slag and curing age    72
1.3.2. Effect of foaming agent and surface treatment    74
1.4. Particle crushing strength    75
1.4.1. Effect of ground blast furnace slag and the curing age    75
1.4.2. Effect of foaming agent and surface treatment    77
1.5. XRD and SEM analysis    78
2. Fresh concrete properties    84
3.1. Unit weight    84
3.2. Workability of fresh SCC    85
3.2.1. Effect of ALWA with/without foaming agent and with/without surface treatment    90
3.2.2. Effect of curing age of ALWA and FA-GBFS/RHA-GBFS aggregate    92
4 Compressive strength of SCC    93
4.1. Effect of curing age of ALWA and FA-GBFS/RHA-GBFS aggregate    93
4.2. Effect of ALWA with/without foaming agent and with/without surface treatment    95
5 Splitting tensile strength    98
5.1. Effect of curing age of ALWA and FA-GBFS/RHA-GBFS aggregate    98
5.2. Effect of ALWA with/without foaming agent and with/without surface treatment    100
6. Dynamic modulus of elasticity    101
6.1. Effect of curing age of ALWA and FA-GBFS/RHA-GBFS aggregate    101
6.2. Effect of ALWA with/without foaming agent and with/without surface treatment    102
7 Drying shrinkage    105
8 Thermal conductivity    107
8.1. Effect of curing age of ALWA and FA-GBFS/RHA-GBFS aggregate    107
8.2. Effect of ALWA with/without foaming agent and with/without surface treatment    109
9 Electrical resistance    110
9.1. Effect of curing age of ALWA and FA-GBFS/RHA-GBFS aggregate    110
9.2. Effect of ALWA with/without foaming agent and with/without surface treatment    112
10. Ultrasonic pulse velocity    113
10.1. Effect of curing age of ALWA and FA-GBFS/RHA-GBFS aggregate    113
10.2. Effect of ALWA with/without foaming agent and with/without surface treatment    116
Chapter 5 – Conclusion and suggestions    118
1 Conclusion    118
2 Suggestion    121
References    122
                                

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全文公開日期 2022/07/17 (校內網路)
全文公開日期 2027/07/17 (校外網路)
全文公開日期 2027/07/17 (國家圖書館：臺灣博碩士論文系統)

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