轻烧煤矸石混合电子含氟污泥制备混合材及其对水泥性能的影响

直接轻烧电子含氟污泥用作水泥混合材存在火山灰活性不高、标准稠度需水量大等问题,本文利用煤矸石作为电子含氟污泥的硅铝质补充来源,将电子含氟污泥和煤矸石混合后轻烧制备水泥混合材,通过强度活性指数、水泥力学强度、水泥标准稠度需水量、凝结时间、粒度分布等指标以及X射线衍射和扫描电镜等试验,探究了轻烧煤矸石混合电子含氟污泥制备水泥混合材对水泥性能的影响。结果表明:与直接轻烧电子含氟污泥制备的水泥混合材相比,煤矸石混合电子含氟污泥后轻烧制备的水泥混合材,可改善水泥的颗粒级配,降低水泥的标准稠度需水量,提高水泥混合材的活性和所配制普通硅酸盐水泥强度,但会使水泥的初凝时间延长、终凝时间缩短。

Preparation of admixture by lightly calcinated electronic fluorine-containing sludge mixed with coal gangue and its effect on cement properties

In view of the problems posed by low pozzolanic activity and large water requirement of normal consistency in the direct light calcinating of electronic fluorine-containing sludge as cement admixture, this paper uses coal gangue as a supplementary silicon and aluminum source of electronic fluorine-containing sludge to mix electronic fluorine-containing sludge and coal gangue and then to prepare cement admixture by light calcinating. This paper studied the effect of cement admixture prepared by light calcinating electronic fluorine-containing mixed with sludge coal gangue on cement properties through strength activity index, mechanical properties of cement, water requirement of normal consistency, setting time, particle size, X-ray diffraction and scanning electron microscopy. The results show that compared with direct light calcinating of electronic fluorine-containing sludge to prepare cement admixture, light calcinating of electronic fluorine-containing sludge mixed with coal gangue can improve the particle gradation of cement and reduce the water requirement of normal consistency of cement. It can significantly improve the activity of cement admixture and the strength of ordinary portland cement. Significantly extending the initial setting time and shorten the final setting time of cement.