陶瓷废弃物粉末火山灰活性的研究

Study on Pozzolanic Activity of Ceramic Waste Powder

关键词:  陶瓷废弃物  比表面积  火山灰活性  Frattini试验法  SAI试验法

Key words:  ceramic waste  specific surface area  pozzolanic activity  Frattini test method  SAI test method

摘要:

对不同种类陶瓷废弃物（卫浴陶瓷、外墙陶瓷和地砖陶瓷废弃物）分别进行8h和16h的机械研磨，得到不同种类和不同细度的陶瓷废弃物粉末.测试分析了陶瓷废弃物粉末的比表面积、氧化物组成、晶相等.将陶瓷废弃物粉末按20%质量分数替代部分水泥，然后采用Frattini试验法和SAI（强度活性指数）试验法研究陶瓷废弃物粉末的火山灰活性.结果表明：各种陶瓷废弃物粉末均具有一定的火山灰活性；卫浴陶瓷及地砖陶瓷废弃物粉末火山灰活性随着各自比表面积的增大而显著提高；陶瓷废弃物粉末中的SiO2碱活性较低,而Al2O3与Ca（OH）2发生反应是其呈火山灰活性的主要原因.

Abstract:

Different kinds of ceramic wastes（sanitary ceramics, exterior wall ceramics and floor tile ceramics） were respectively ground for 8h and 16h by a ball milling to obtain different fineness of each one. Specific surface area, oxide composition and crystal phase were tested. Then the Portland cement was substituted partly with ceramic waste powder at the rate of 20%（by mass）, and the pozzolanic activity of ceramic waste powder was examined according to the Frattini test method and SAI test method. The test results show that all the ceramic waste powders have pozzolanic activity. Pozzolanic activities of sanitary ceramic waste powder and floor tile ceramic waste powder are improved with the increase of the specific surface area of ceramic waste powder. In the ceramic waste powder the alkali reactivity of SiO2 is lower, the reaction between Al2O3 and Ca（OH）2 is the main reason for the pozzolanic activity of ceramic waste powder.