生物质灰对水泥硬化浆体抗压强度影响的试验研究

对比研究了生物质灰与普通粉煤灰在粒度分布、颗粒形态、化学组成、活性指数等方面的不同,并开展了不同掺量生物质灰对水泥硬化浆体抗压强度的影响研究.结果表明:生物质灰颗粒形状不规则、平均粒径及粒径分布范围较大,具有特有的细长纤维状颗粒,且其活性组分Al2O3不足普通粉煤灰的三分之一;生物质灰的火山灰活性小于普通粉煤灰;相同掺量下,生物质灰-水泥复合胶砂各龄期的抗压强度均小于普通粉煤灰-水泥复合胶砂,生物质灰掺量越大,复合胶砂的强度相比纯水泥组下降程度越大;与普通粉煤灰相比,掺加生物质灰的硬化水泥浆体微观结构更为疏松多孔,特别是其特有的细长纤维状颗粒的存在.

Influence of Biomass Ash on the Compressive Strength of Hardened Cement Paste

The difference between biomass ash and fly ash on the particle size distribution, particle morphology, chemical compositions and activity index was studied.Cement mortar tests adding different biomass ash contents were conducted to evaluate the compressive strength of hardened cement paste.The results show that the particle shape of biomass ash is irregular, the average particle size and particle size distribution range is larger.It has the slender fibrous particles, and the active components of Al2O3 are less than a third of the ordinary fly ash.The pozzolanic activity of biomass ash is lower than fly ash.Under the same content, the compressive strength of biomass ash-cement complex mortar is less than fly ash-cement complex mortar at all ages, the more dosage, the greater the strength decreased degree compared with the pure cement group.The microstructure of adding biomass ash of hardened cement paste is more loose and porous than the sample of containing fly ash, especially the existence of its peculiar slender fibrous particles.