| 研究生: |
李冠德 Lee, Chan-Te |
|---|---|
| 論文名稱: |
含泥量對於自充填混凝土
性質之影響 Effect of Soil Content on the Properties of Self Compacting Concrete |
| 指導教授: |
唐啟釗
Tang, Chii-jau 丁舜臣 Tin, S. C. |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 水利及海洋工程學系碩士在職專班 Department of Hydraulic & Ocean Engineering (on the job class) |
| 論文出版年: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 100 |
| 中文關鍵詞: | 新拌性能 、硬固性能 、含泥率 、自充填混凝土 、配比設計 |
| 外文關鍵詞: | property of new mixture, gradation design, self-compacting concrete, property of robustness, soil content ratio |
| 相關次數: | 點閱:104 下載:3 |
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混凝土材料變異性較大,尤其是粗細粒料之形狀、含水量、級配、細度模數、含泥量,及摻料品質用量等因素,都是控制混凝土的新拌性質及硬固性質之關鍵。而成份材料的性質對自充填混凝土(Self-Compacting Concrete, SCC)的影響,比起對傳統混凝土的更為敏感。本研究即針對細粒料的含泥量這一項因素,對SCC的影響,安排整套實驗進行研究探討。
SCC設計強度為5000psi、6000psi、7000psi的三種配比A系列案例。其細粒料含泥率分別為0%、1.25%、2.5%、3.75%、5%。A系列每立方米經加配15kg拌合水成為B系列案例,而細粒料含泥率分別為0%、5%、10%、15%。每一實驗案例,分別測試新拌混凝土性質及硬固混凝土試體各齡期強度。實驗成果顯示,含泥率往上增加時,新拌混凝土的稠度會增加,其自行填充性能也就減低。含泥率5%時,A系列新拌混凝土,完全喪失了流動性。B系列新拌混凝土,在一開始含泥率0%時,已有析離的現象,但隨著含泥率往上增加,新拌混凝土的稠度也跟著增加,在含泥率5%、10%反而有較佳的流動能力。因此可以得知,含泥率的高低會直接影響用水量的多寡。
實驗結果顯示,SCC之細粒料含泥率的允許值為2.5%,若是骨材含泥量越高的話,則須調整配比之用水量。本研究於拌合每一案例時,泥質是與洗淨的細粒料,及其他拌料,一同進入小型拌和鼓攪拌。充分拌和費時長達七分鐘,使泥質與漿體充分攪和。這種充分攪和作用,在泥質量較少時,因為泥質表面吸附了一些水份,使水膠比略降,反能提昇SCC之硬化強度。至於,泥質量較高時,SCC之稠度大幅提昇,使新拌混凝土失去應有的流動性。至於,預拌廠內之所堆置的細粒料,泥質是現成的附着在粒料表面,而不是於拌時另外添加。因此本項研究,在小型試拌作業上,有參考作用,但尚不足充分代表廠拌實況。顯示本研究結果頗具實用性值得後續研討,期望本研究之成果有助於土建工程對自充填混凝土之推廣及混凝土施工品質之提昇設計。
Concrete materials can have lots of variability, the shape of the thickness of the granularity, the moisture content, gradation, fineness modulus, sand content, and the quality of the amount of the admixture used are all the key factors that will affect the property of new mixture and the property of robustness of the concrete. The nature of the ingredients has more sensitive effects on self-compacting concrete (SCC) than on traditional concrete. The purpose of this study is to explore the effects that the sand content of the fine aggregates will have on SCC.
The design robustness of SCC includes 3 mixing A-series scenarios: 5000psi, 6000psi and 7000psi. The sand content ratios of the fine aggregates are: 0%, 1.25%, 2.5%, 3.7% and 5%. A-series scenarios per cubic meter combined with 15kg mixing water will form B-series scenario whose sand content ratios of the fine aggregates are 0%, 5%, 10% and 15%. Each experimental scenario is used to test the nature of the newly mixed concrete and the robustness of the specimens for the hardened concrete in every stage. The experiment results indicate when the sand content ratio increases, the denseness of the newly mixed concrete will increase as well, and its self-compacting property will decrease accordingly. When the sand content ratio reaches 5%, the flow of the newly mixed concrete in A-series scenario will be gone completely. In the newly mixed concrete in B-series scenario, there will be isolation when the sand content ratio is 0%, but as the sand content ratio increases, the denseness of the newly mixed concrete will increase as well, and when the sand content ratio reaches 5% and 10%, there will be better flow ability. Therefore, it is concluded the degree of sand content ratio will have direct effects on the amount of water used.
The experiment result also indicates the allowed value for the sand content ratio of the fine aggregate of SCC is 2.5%. If the sand content ratio of the aggregate materials is higher, the amount of water used must be modified accordingly. In this study, when each scenario is admixed, the sand is put into small mixing device together with clean fine aggregates and other admixture. It takes 7 minutes to completely blend the sand and the paste. This agitation, when the sand ratio is lower, can increase the hardened robustness, because the surface of the sand absorbs moisture and therefore reduces the hydrogels. When the sand ratio is higher, the denseness of SCC will significantly increase so that the newly mixed concrete will lose its flow capability that it is supposed to have. As to those fine aggregates stored in the concrete mixer, the sands are attached to the surfaces of the fine aggregates, they are not added during blending process. Therefore, this study can serve as a reference for small mixing operations, but it is not sufficient enough to represent the situation that actually happens in the concrete mixers. The results revealed by this study are very practical and should be followed up in subsequent studies. It is expected the results of this study will be of great help to the quality improvement for the self-compacting concrete construction engineering and the popularization of the concrete construction.
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