固废基复合地聚合物的凝结时间与流变性能

Setting Time and Rheological Properties of Solid Wastebased Composite Geopolymers

摘要:

试验研制了建筑废弃砖粉高钙粉煤灰基复合地聚合物，并系统研究了其凝结时间与流变性能.结果表明：地聚合物凝结时间随着废弃砖粉掺量的增加而缩短，随水玻璃模数的增大而逐渐缩短，随水玻璃用量的增加而延长，随养护温度的升高而迅速缩短；利用Matlab对固废基复合地聚合物的流变曲线进行拟合，发现实测数据符合赫切尔巴尔克莱流体本构关系；随废弃砖粉掺量的增大，复合地聚合物浆体的屈服应力和稠度系数均呈增大趋势，流变指数相应降低.

Abstract:

Solid wastebased composite geopolymer was prepared from high calcium fly ash and construction waste brick powder. The setting time and the rheological properties were also investigated. The results show that the initial setting time and final setting time of the solid wastebased composite geopolymer increased with the increase of the content of waste brick powder, shortened gradually along with the increase of the modulus of water glass, slightly increased with the increase of the content of water glass, and rapidly shortened with the increase of curing temperature. Rheological curve of the solid wastebased composite geopolymer was fitted by Matlab, and the results show that the measured data are in according with the HerschelBulkely fluid curve. With the increase of the content of waste brick powder, the yield stress and viscosity of geopolymer paste increases but the flow behavior index decreases.