钢渣掺量对3D打印地聚物工作性能和早期强度影响

Effect of steel slag content on working ability and early strength of 3D printed geopolymer

将多种固废协同制备地聚物用于3D打印胶凝材料,可以提高3D打印技术的可持续性,为固废处置提供新型资源化利用途径,但是关于3D打印固废地聚物的工作性能和早期强度有待研究。本文以钢渣、粉煤灰、矿渣粉三种工业固废为原料,以偏硅酸钠为激发剂,“一步法”制备可3D打印的多固废地聚物,测试不同原料配比下地聚物的流动度、凝结时间和早期(7d)抗压强度,分析钢渣掺量和用水量对其工作性能和强度影响,并进行了3D打印初试。结果表明,适当钢渣掺量可缩短凝结时间,早期强度随用水量而增加,改变钢渣掺量可控制3D打印多固废地聚物的工作性能。

Using multi-solid wastes to synthesize geopolymer synergistically and taking it as 3D printing cementitious material can improve the sustainability of 3D printing technology and develop a new reuse approach for the treatment of solid wastes.However,the workability and early strength of 3D printing solid wastes based geopolymer need to be further studied.In this paper,the rheology and mechanical properties of multi-solid wastes geopolymer are investigated.The raw materials of steel slag(SS),fly ash(FA)and granulated blast furnace slag are activated with sodium silicate to synthesize geopolymer.The fluidity,setting time and 7 days compressive strength are measured for the geopolymer mortar with different SS contents,to assess the effects of SS content and water consumption on the working ability and compressive strength.Moreover,a preliminary 3D printing is conducted with the geopolymer mortar.The results show that the appropriate SS content can shorten the setting time,and the early strength is increased with water content.By changing the content of SS,the workability of 3D printed multi-solid waste geopolymer can be well controlled.