Influences of Interfacial Transition Zone on the Abrasion Resistance of Concrete by Waterborne Sand

• Main Authors: Hsu-Chih Hsiao, 蕭旭志
• Other Authors: Tsong Yen
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/24486201866948043761

碩士 === 國立中興大學 === 土木工程學系 === 93 === Abstract The abrasion resistibility of hydraulic concrete structures is one of the important indexes for its quality, and the interfacial transition zone (ITZ) and surface hardness are the important factors that affect the abrasion resistance of concrete. This study using waterborne sand abrasion erosion test apparatus to measure the abrasion resistance of concrete, and combines the microhardness test to investigate the relations between the ITZ and the abrasion resistance. The samples of concrete for experimental tests were prepared with a water/binder ratio of 0.35 and three kinds of pozzolanic material with various cement replacement levels (fly ash: 15%, 30%, 40%; slag: 20%, 40%, 60%; silica fume: 5%, 10%, 15%). Test results show that the concrete containing fly ash and slag at early age (7 days) decrease the strength of ITZ and abrasion resistibility, but these properties will improved gradually at later age due to the effects of pozzolanic materials. As to the replacement levels, it is recommended to be 15% to 30% for fly ash, and 20% to 40% for slag, respectively. Using silica fume to replace partial cement can improve the strength of ITZ and abrasion resistance at early age. Moreover, it is found that the abrasion resistance of concrete with fly ash, slag and silica fume is proportional to the microhardness at ITZ and cement paste, namely, the greater the hardness is, the better the abrasion resistance will be.