The Study of Cement Mortar of fresh and engineering properties with carbon fiber

• Main Authors: Feng-Cheng Zhang, 張逢宬
• Other Authors: Her-Yung Wang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/22276361068817841369

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 102 === Carbon fiber has excellent thermal conductivity, to enhance the performance of cement composites relevant to add or replace carbon fibers modified its approach is to study a trend nowadays. In this study, the use of carbon fiber and carbon fiber silica, fixed water-binder ratio (W / B = 0.45), cement: fine aggregate: water = 1:2.75:0.45, adding some HPC2000 and silicone antifoam, mixing standard fluidity of cement mortar, adding 0.5% ,1.0% carbon fiber and carbon fiber silica in cement mortar, For research engineering properties (fresh and hardened, durable and thermal properties). To enhance the workability and durability, while replaced 10% of cement or fine aggregate by fly ash. The results show that adding carbon fiber to increase the setting time of cement mortar, reduce self-weight; add silica carbon fiber can reduce self-weight 4.58% ~ 5.83% , while the carbon fiber to add a 1.0% increase the compressive strength and flexural strength of 6.3%, 24.8%; Add silica carbon fiber no better than carbon fiber hardened properties, but better than the carbon fiber workability, durability and thermal conductivity. Because carbon fibers contain silica, carbon fiber can tolerate than sulfate attack, carbon fiber can tolerate sulfate attack, and the impact on thermal conductivity. The results show that the carbon fiber is preferably 1.0%, while the silica carbon fiber is preferably 0.5%. Replace the fine aggregate with 10% fly ash, workability and engineering properties better than cement, therefore 91 days can improve the compressive strength of 82%, and fly ash to fill the pores of fine aggregate, so hardened properties and durability properties have a very good performance; replace the sand with fly ash, 91 days strength is unsubstituted 10 multiples, show pozzolan material positive impact and effectiveness.