脱硫粉煤灰掺量对蒸压加气混凝土稳定性影响及其机理  

Effect of desulfurized fly ash dosage on the stability of autoclaved aerated concrete and its mechanism

作　　者：韩磊 方珏静[2] 何祥 许起[1] 刘云龙 苏松嵘 秦宇鹏 HAN Lei;FANG Juejing;HE Xiang;XU Qi;LIU Yunlong;SU Songrong;QIN Yupeng(Shanxi Coal International Energy Group Co.,Ltd.,Taiyuan 030000,China;School of Mining Engineering,Anhui University of Science&Technology,Huainan 232001,China)

机构地区：[1]山煤国际能源集团股份有限公司,山西太原030000 [2]安徽理工大学矿业工程学院,安徽淮南232001

出　　处：《中国矿业》2024年第S02期357-362,共6页China Mining Magazine

基　　金：国家自然科学基金重点项目资助(编号:52130402);国家自然科学基金区域创新发展联合基金项目资助(编号:U21A20110)。

摘　　要：随着环保要求的提高和资源循环利用的推广,脱硫粉煤灰作为一种煤电化副产品,在改善蒸压加气混凝土(AAC)的性能方面具有潜在的应用价值。为了深入研究脱硫粉煤灰掺量对AAC稳定性的影响及其机理,开展了以不同比例的脱硫粉煤灰替代普通粉煤灰的稳定性实验,通过对六组不同掺量试件的稠度、干密度进行测试,并分析了其对AAC试件抗压强度的影响趋势,结合ACC水化过程,探讨了脱硫粉煤灰从微观到宏观对AAC的结构和性能的影响,阐明了脱硫粉煤灰对蒸压加气混凝土稳定性影响机理。研究结果表明,在脱硫粉煤灰的初始掺入阶段,由于其作为微细填料的功能,以及促进水化反应的作用,显著提高了AAC的干密度和初期抗压强度,在脱硫粉煤灰掺量为30%时,AAC试件强度达到阈值。然而脱硫粉煤灰掺量对AAC具有双向作用,过多的脱硫粉煤灰导致气孔增多及活性降低,进而影响试件的长期稳定性。本文研究成果对于ACC工艺的优化具有较大参考价值,为脱硫粉煤灰在蒸压加气混凝土领域的运用提供了理论依据和数据支撑。With increasing environmental regulations and the promotion of resource recycling,desulfurized fly ash,a byproduct of coal-fired power generation,has potential applications in enhancing the performance of autoclaved aerated concrete(AAC).To deeply investigate the impact of desulfurized fly ash dosage on the stability of AAC and its mechanisms,stability experiments are conducted using various proportions of desulfurized fly ash to replace ordinary fly ash.The consistency and dry density of six different mix proportions are tested,and the influence on the compressive strength of AAC specimens is analyzed.Alongside the hydration process of AAC,the effects of desulfurized fly ash from the micro to macro levels on the structure and performance of AAC are explored,elucidating the mechanisms by which desulfurized fly ash affects the stability of autoclaved aerated concrete.The study shows that in the initial phase of incorporating desulfurized fly ash,due to its role as a micro-filler and its enhancement of the hydration reaction,there is a significant improvement in the dry density and early compressive strength of AAC,with the strength of AAC specimens reaching a threshold at 30%fly ash content.However,the addition of desulfurized fly ash has a bidirectional effect on AAC.Excessive amounts lead to an increase in porosity and a decrease in reactivity,subsequently affecting the long-term stability of the specimens.These findings provide significant references for optimizing AAC processes,offering a theoretical basis and data support for the application of desulfurized fly ash in the field of autoclaved aerated concrete.

关 键 词：脱硫粉煤灰掺量 蒸压加气混凝土 水化反应 气孔结构 稳定性 

分 类 号：TD989[矿业工程—选矿]