二氧化碳養護對混凝土性質影響之研究;The Effect of Carbon Dioxide Curing on Concrete Properties

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/73742

Title:	二氧化碳養護對混凝土性質影響之研究;The Effect of Carbon Dioxide Curing on Concrete Properties
Authors:	高士軒;Kao, Shih-Hsuan
Contributors:	土木工程學系
Keywords:	二氧化碳養護;尺寸效應;中性化;彈性模數;破裂模數;CO2 Curing;Size Effect;Carbonation Depth;Elastic Modulus;Rupture Modulus
Date:	2017-07-12
Issue Date:	2017-10-27 12:14:33 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究以普通強度混凝土製作成Ф5×10 cm、Ф10×20 cm、Ф15×30 cm三種不同尺寸之圓柱試體進行比較，將試體澆置完成後擺放四個小時完成初凝後立即拆模，放入加壓二氧化碳氣體環境下進行加速養護試驗，並控制三種二氧化碳濃度、三種加壓時間、兩種加壓壓力作為養護環境參數，碳養護完成之後放入飽和石灰水中養護。本研究探討混凝土圓柱經過不同環境參數之二氧化碳加速養護後，其尺寸效應、抗壓強度、彈性模數、碳化深度之影響，之後取一抗壓強度較佳之環境控制參數，進行破裂模數試驗。從實驗結果可以發現，不同的試體尺寸對於其各齡期發展至較高抗壓強度的環境控制參數組合也有所不同，而在同一個環境控制參數下，對於三種尺寸的影響程度也各有不同。一般水養護條件下在90天齡期之Ф5×10 cm試體強度高出其餘兩種尺寸約13 %，而經過碳養護後，排除試體本身之尺寸效應後得到的純碳養護放大效果較高者為30 %。不論是否經過碳養護或是試體尺寸差異，彈性模數差異低於5 %；試體經過碳養護後，破裂模數未受影響；試體經過碳養護之後，有深度約1.71 mm的中性化現象；Ф15×30 cm試體抗壓強度表現最佳者為二氧化碳濃度50 %，養護1小時，養護壓力2 bar(kgf/cm²)，其3、7、28與90天齡期抗壓強度分別較控制組增加29 %、38 %、8 %與11 %。 ;This research used normal strength cylinder concrete included three different sizes with Ф5×10 cm、Ф10×20 cm and Ф15×30 cm to compare with each other. After casted in cylinder model for four hours in air to finish initial setting program, removed the form immediately then put specimens into pressure chamber which injected the high carbon dioxide gas to start doing the fast curing test with factors included three carbon dioxide concentrations, three curing time and two curing pressures. Finally, put carbonated specimens in the saturated limewater to keep after curing. This research will discuss compressive strength, elastic modulus and neutral degree for different cylinder concrete sizes in different environment factors of CO2 curing. After that, the experiment of rupture modulus was run by choosing a CO2 curing factor for higher compressive strength. According to the result, the compressive strength of specimen size and curing duration by different CO2 curing factors was different; however, the effect of specimen size is apparent in the same CO2 curing factor. The compressive strength of Ф5×10-cm specimens was higher than other two sizes about 13% in the 90-day water curing. After CO2 curing, the amplification coefficient of CO2 curing excluded the size effect from water curing was 30%. No matter CO2 curing or not, or the size effect, the difference of elastic modulus was less than 5%. After CO2 curing, the modulus of rupture was similar to the water-curing one and the depth of carbonation reached a depth of 1.71 mm. The optimal compressive strength of Ф15×30-cm specimen by curing was 50% CO2 concentration, 1 hour curing and 2 bar pressure. The compressive strength of CO2-cured specimens at 3, 7, 28 and 90-day duration was higher than the water-curing ones about 29%, 38%, 8% and 11%, respectively.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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