热活化污泥—高钙粉煤灰复合地聚合物的性能与机理研究

PERFORMANCES AND MECHANISM OF COMPLEX GEOPOLYMERS PREPARED FROM THERMALLY-TREATED SLUDGE AND HIGH-CALCIUM FLY ASH

摘要:

与传统的普通硅酸盐水泥相比，地聚合物是一种低碳排放且能源、资源消耗较少的新型胶凝材料。本文研究了资源化利用高钙粉煤灰和热活化污泥研制复合地聚合物的可行性，并研究了研制的复合地聚合物的性能与机理。研究表明：经900℃焙烧1 h的污泥（<45 m）以10%的掺量取代粉煤灰后研制成的地聚合物具有较好的抗压强度；在复合地聚合物体系中，无定形地聚合物凝胶包裹在球状粉煤灰颗粒周围，有类沸石矿物生成，出现了Al-O/Si-O对称伸缩峰及Si-O-Si/Si-O-Al弯曲振动峰。这一研究可以丰富地聚合物原材料的选择，有助于多种工业废弃物，尤其是含硅铝相和含钙的工业废弃物的资源化利用。

Abstract:

Compared to the ordinary Portland cement, geopolymer is a new type of cementitious material which is a low carbon, energy and natural sources saving material. In this paper, the feasibility of a complex geopolymer prepared from high-calcium fly ash and thermally-treated sludge was studied, and the performance and mechanism of the geopolymer were also studied. The results showed that compressive strength of the geopolymer was better when 10% fly ash was replaced by thermally-activated sludge (<45 m) at 900℃ for 1 hour. In complex geopolymeric matrix, amorphous geopolymeric gel covered around spherical fly ahs granule, the Zeolite-like mineral formed, meanwhile, the asymmetric stretching Al-O/Si-O bonds and Si-O-Si/Si-O-Al bending band appeared. This work is beneficial for extending raw materials of geopolymer, and also for utilizing of multi industrial wastes, especial the wastes containing silicate-aluminum phase and calcium.