【作者】 吴凯； 施惠生； 郭晓潞； 蒋正武；

【Author】 WU kai;SHI hui-sheng;GUO xiao-lu;JIANG zheng-wu;Key Laboratory of Advanced Civil Engineering Materials of Education Ministry,Tongji University;

【机构】 先进土木工程材料教育部重点实验室同济大学；

【摘要】 通过改变垃圾焚烧飞灰掺量、碱度等率值参数,研究了利用焚烧飞灰烧成硫铝酸盐水泥熟料的形貌、化学组成,并结合重金属离子对孰料水化过程的影响,确定以焚烧飞灰为主要原料制备硫铝酸盐水泥的方法。结果表明:生料配比中垃圾焚烧飞灰适宜掺量为30%,率值应控制为碱度C_m=1.00~1.05、铝硫比P=2.5和铝硅比n=3。无水石膏掺量可根据实际需要,在5%~20wt.%范围内进行调节,均能配制出物理性能优异的水泥;重金属对硫铝酸盐水泥水化性能影响取决于重金属离子种类及石膏掺量:无石膏掺量条件下,重金属Cr、Cu、Zn可促进水泥水化,而Pb则会延迟水化进程;掺20%石膏条件下,Cr、Cu、Pb可显著提高硫铝酸盐水化反应速率。更多还原

【Abstract】 Mumcipal solid waste incineration（MSWI） fly ash was used as a raw material in preparing sulphoaluminate cement clinker.The effects of MSWI fly ash dosage and alkalinity modulus on the formation of phases in the clinker were investigated.The hydration of calcium sulfoaluminate C4A3 S in the presence of heavy metal were also determined by isothermal conduction calorimetry.The results show that the desirable sulphoaluminate cement clinker can be fired by controlling the compositional parameters like alkalinity modulus（C_m） = 1.00-1.05,alumina-sulfur ratio P = 2.5,and alumina-silica ratio n = 3,and the addition of MSWI fly ash into the raw mixture should not be greater than 30%.The effects of heavy metals on the hydration of C₄A₃S depend on the types of heavy metals and the addition of gypsum.Without any gypsum addition,heavy metal nitrates such as Cr,Cu,and Zn promote the hydration of C₄A₃S,whereas Pb presents a strong retardation effect at the early age of C₄A₃S hydration.When 20%of gypsum is added to C4A3 S,heavy metals tend to accelerate the hydration of the blended pastes except Zn.更多还原