生活垃圾焚烧炉渣作水泥混合材的研究

论文对生活垃圾焚烧炉渣（简称炉渣）的性质，其用作水泥混合材的活性，它对水泥与外加剂的相容性、砂浆干缩性能、钢筋锈蚀及其它物理性能的影响进行了全面的研究，同时考察了相应的水泥制品的环境安全性，为炉渣的资源化、无害化利用提供理论依据。结果表明：炉渣是一种非活性混合材，它的掺入不影响水泥安定性，会引起标准稠度略有增大，凝结时间稍有延长；随着炉渣掺量的增加，水泥胶砂强度下降，同等掺量的水洗炉渣对强度降幅的影响减小，当炉渣掺量为7.5%时，各项性能均满足PO42.5水泥的生产要求；炉渣对水泥的外加剂相容性影响不大，能降低水泥胶砂的干缩率，不会对钢筋锈蚀造成危害；掺15～40%炉渣的水泥制品重金属极限溶出达到III类地下水的要求，掺80%时达到IV类地下水的要求；掺15%炉渣水泥制品的重金属表面浸渍溶出达到III类地下水的要求，不会对环境造成二次污染。

Research on Municipal Solid Waste Incineration Bottom Ash used as Cement Admixture

The properties of cement with the incineration bottom ash of municipal solid waste as the admixture were investigated, and the environmental safety of the cement product was analyzed. The results show that (1) the bottom ash is an inactive admixture without radioactivity, which has no obvious influence on the cement soundness, the water consumption of standard consistence and the cement setting time;(2) the compressive strength of the cement decreases with the increase of bottom ash dosage;(3) washed bottom ash has a relatively slight influence on the compressive strength;(4) a bottom ash dosage of 7.5% is suitable for the production of P·O42.5 cement;(5) though the bottom ash has no obvious influence on the compatibility with superplasticizer, it reduces the shrinkage rate without arousing a steel corrosion;(6) at a bottom ash dosage of 15%~40% or 80%, the leaching limit of heavy metals in mortar reaches the standard of groundwater type Ⅲ or type Ⅳ, respectively;and (7) at a bottom ash dosage of 15%, the surface leaching of heavy metals in mortar also reaches the standard of groundwater type Ⅲ. It is thus concluded that the addition of bottom ash in cement does not bring about any harm to the environment and human health.