The study on macro-micro property of cementitious material by used Fuller’s gradation curve

• Main Authors: Su-Lan Hsieh, 謝素蘭
• Other Authors: Chao-Lung Hwang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/80084545411661017185

博士 === 國立臺灣科技大學 === 營建工程系 === 97 === The study on macro-micro property of cementitious material by used Fuller’s gradation curve Graduate Student: Su-Lan Hsieh Thesis Advisor: Chao-Lung Hwang Abstract Since global consideration of CO2 emission, energy conservation and structure sustainability, the concrete design nowadays should both reduce the cement content and improve durability. This paper mainly discussed the macro-micro properties of cementitious material. The Fuller’s gradation curve is applied to enable fully packing with all solid particles. Then, the least void volume of paste (Vv) can be obtained. Mixtures with cementitious material of different quality and quantity were designed. Such fresh properties as workability, unit weight and heat of hydration were measured, while harded properties included compressive strength, the strength efficiency of cement, pulse velocity, electrical resistivity, chloride ion permeability and sulfate attack were also measured. SEM, MIP and 3D microscopy were analysied. The results show as the workability of cementitious material will be flowable by simply using SP. Under the same w/b and age, if no imperfection is involved, compressive strength, ultrasonic pulse velocity, electrical resistance, and Chloride Penetration are linear proportion to the coating thickness, and the thinner the coating thickness the better the performance of concrete is specified. Compares in the ACI method, the fuller’s ideal curve method surpasses ACI design of strength efficiency of cement benefit approximately 2.55 above times law, and would reduce the chloride ion permeability of HPC up to about 2.94~7.15 times. Concrete specimens with optimal paste thicknesses are experimented to seek explanations for problems of concrete, if the coating thickness on aggregate is decreased, the durability is increased, such as electrical resistivity, chloride ion permeability and sulfate attack. Keyword: Fuller’s gradation curve , Cementious material, Cementitious quantity , Coating thickness, Durability