矿物掺合料对泡沫混凝土性能的影响

Influence of Mineral Admixtures on Performance of Foam Concrete

摘要:

开展了粉煤灰（FA）、矿渣微粉（GBFS）、提钛尾渣（TS）等3种矿物掺合料对泡沫混凝土性能影响的研究.结果表明：3种掺合料均能在一定程度上提高泡沫混凝土的体积密度，其中TS的影响尤为明显；GBFS会降低泡沫混凝土的流动度，但TS和低掺量FA能提高其流动度；3种矿物掺合料在低掺量时均能提高泡沫混凝土的体积吸水率和毛细吸水率，但在较高掺量时，又降低了其体积吸水率和毛细吸水率，其中TS和GBFS的降低作用尤为明显； 3种矿物掺合料在高掺量时均能明显提高泡沫混凝土的抗压强度，其中TS的提升效果最好；FA和GBFS提高了泡沫混凝土的28 d干燥收缩率，TS则显著降低其28 d干燥收缩率；综合而言，FA和GBFS最佳掺量范围均为10%~15%，TS为5%~15%.

Abstract:

A study was conducted to investigate the effects of three mineral admixtures—fly ash （FA）， ground granulated blast furnace slag （GBFS）， and titanium-extracted tailings （TS）—on the properties of foam concrete. The results indicated that all three admixtures could increase the bulk density of foam concrete to some extent， with TS showing the most significant effect. GBFS reduced the fluidity of foam concrete， while TS and low dosages of FA improved it. At low dosages， all three mineral admixtures increased the volumetric water absorption and capillary water absorption of foam concrete. However， at higher dosages， they reduced these properties， with TS and GBFS showing particularly notable reductions. At high dosages， all three admixtures significantly enhanced the compressive strength of foam concrete， with TS providing the most improvement. FA and GBFS increased the 28 d drying shrinkage of foam concrete， whereas TS significantly reduced it. Overall， the optimal dosage ranges for FA and GBFS were found to be 10%-15%， and for TS，5%-15%.