二氧化碳養護對高強度透水混凝土性質之影響;The Effect of Carbon Dioxide Curing on High Strength Pervious Concrete

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Title:	二氧化碳養護對高強度透水混凝土性質之影響;The Effect of Carbon Dioxide Curing on High Strength Pervious Concrete
Authors:	蕭宛瑄;Xiao, Wan-Xuan
Contributors:	土木工程學系
Keywords:	高強度透水混凝土;二氧化碳養護;磨損試驗;彈性模數
Date:	2018-07-31
Issue Date:	2018-08-31 11:25:25 (UTC+8)
Publisher:	國立中央大學
Abstract:	隨著工業的發展，環境的變遷，逐年來環保意識的抬頭，推動二氧化碳封存及收集技術，而如何消耗收集的二氧化碳，成了一部分研究。為改善都市熱島效應推薦鋪設透水性鋪面，透水混凝土為其中之一，但其使用範圍並不廣泛，因在要求滲透性能下，而降低了透水混凝土強度。因此本研究欲製作高強度透水混凝土進行試驗，並使用CO2進行養護，探討經過CO2養護是否快速能提升原有強度。試驗規劃為製作Φ10×20 cm及Φ15×30 cm試體，觀察CO2養護及控制組(水養護)抗壓強度、彈性模數及磨損試驗，並使用XRD和SEM 檢視微結構分析。結果顯示，高強度透水混凝土控制組之抗壓強度發展迅速，當齡期為90天時，部分抗壓強度已接近60MPa，雖試驗結果之孔隙率未達15%，但其透水係數符合ACI 522之規定。CO2養護1小時後，抗壓強度影響較大，但其強度與控制組相比，強度約下降0%~23%。本試驗彈性模數係數與台灣混凝土彈性模數建議公式係數採用12000相近，且使用較小粒徑之骨材擁有較高之彈性模數係數。磨損試驗之累計磨損率整體低於0.06%，擁有優良的耐磨性質。由XRD分析發現試片表面生成物例如方解石、霰石、球霰石、氫氧化鈣、二氧化矽及鈣礬石會隨著齡期的增加使含量降低，但其峰值與CO2養護的壓力及時間無明顯的關係。SEM分析，發現CO2養護後，能使試片表面生成物有增加趨勢，例如鈣礬石。 ;In recent years, the global environmental protection has risen in the development of industry and changes of environment. Promoting the technology of carbon capture and storage in the world, and the way how to consume the carbon dioxide could become a part of the research. Using pervious concrete is one of the recommended methods to reduce the urban heat island effect. However, the pervious concrete is not so wide at all and the strength of pervious concrete is much lower than general concrete because of the permeability requirement. The research tried to produce a high strength pervious concrete and use carbon dioxide for curing to find out whether it could enhance the compressive strength. Two dimensions of cylinders are Φ10×20 cm and Φ15×30 cm samples for testing compressive strength, elastic modulus, abrasion resistance, X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The results show that the compressive strength of the control group increases rapidly and its 90-day compressive strength closed to 60 MPa. Although the porosity is less than 15%, the permeability coefficient complies with the regulations of ACI 522. The compressive strength has a major impact after 1 hour of CO2 curing and their strength decreased by about 0% to 23% as compared to the control group. This result is similar to the value of literature-based recommendation, 12000, and the aggregate with small particle size has a higher modulus of elasticity. The test results showed that abrasion resistance of high strength pervious concrete is about 0.06% weight loss less than the normal concrete and has excellent abrasion resistance properties. XRD analysis showed that the surface product of the test piece decreased with the increase of age, for example calcite, aragonite, vaterite, portlandite, quartz and ettringite, but the peak value has no obvious relationship with both the pressure and time of CO2 curing. SEM analysis revealed that the surface product of the test piece, such as ettringite, was increased after CO2 curing.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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