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《Journal of Hydraulic Engineering》 2002-08
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Hydration rate of fly ash and probability of poor lime phenomena in concrete of the Three Gorges Project

CHEN Yi min 1, ZHANG Hong tao 1, LIN Zhen 1 (1 China Building Materials Academy, Beijing 100024,China)  
The relationships between hydration rate, hydration extent, hydration product of the fly ash adopted in the Three Gorges Project and its replaced amount in the concretet are studied by means of selective solution method, wet chemical analysis, X ray diffraction and Thermal gravity method. The cement to be used is a kind of medium heat Portland cement. The result shows that the hydration extent reduces as the amount of fly ash increases, but the amount of the hydration product will increase. In the process of hydration, CaO, MgO and Fe 2O 3 in fly ash enter the hydration products more quickly than SiO 2 and Al 2O 3. But the amounts of SiO 3 and Al 2O 3 entering the products are much more than CaO, MgO and Fe 2O 3, since their contents in the cement fly ash system are great. It is noticed that the amount of SiO 2 entering the hydration products increases steadily. The amount of Ca(OH) 2 will decrease 1/3 if the amount of fly ash increases by 10%. It is suggested that, the replaced amount of fly ash must not exceed the limit of 50%, to prevent from the happening o fpoor lime phenomena.
【Fund】: 国家自然科学基金委员会和中国长江三峡工程开发总公司联合资助项目 (5 9493 60 0 );; 国家建材局资助建材行业应用基础研究项目 (96 J 0 5 )
【CateGory Index】: TV431
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