Influence of flux addition on sintering and bloating of lightweight aggregate formation

• Main Authors: Chuang Shih-Yu, 莊世鈺
• Other Authors: Wei Yu-Ling
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/81172904593270722323

碩士 === 東海大學 === 環境科學與工程學系 === 96 === This study investigates the characteristics of lightweight aggregates sintered from reservoir sediment and harbor sediment added with flux. The flux addition fractions are 5 wt%, 10 wt%, and 15 wt%. Fluxes NaOH and CaCO3 lowered the sintering temperature and increase bloat. The results indicate that 15 wt% NaOH addition to waste sediments and thermal treatment at 950 oC for 18 minutes can generate lightweight aggregate. Besides, bloating condition decreases with incremental addition of CaCO3. This is due to high melting point of CaCO3, so amount of CaCO3 addition must be controlled under 5 wt%. The bulk density of product from reservoir sediment density is 0.52.1 g/cm3 and the water absorption rate is 1.119.6 %. And density of the products of harbor sediment is 0.52.8 g/cm3 and their water absorption rate is 1.919.6 %. Their crushing intensity is 120130 kg/cm2. The Pb leaching level accorded with the TCLP regulation standard. The performance of light aggregate can meet the construction requirement.