多因素下粉煤灰多孔砖力学与墙体抗震性能分析  

Analysis on Mechanics and Seismic Performance of Fly Ash Porous Brick Under Multiple Factors

作　　者：梁博[1] LIANG BO(Shaanxi Energy Institute,Xianyang Shaanxi 712000,China)

机构地区：[1]陕西能源职业技术学院,陕西咸阳712000

出　　处：《当代化工》2022年第12期2801-2805,共5页Contemporary Chemical Industry

基　　金：国家自然科学基金,非极限拉伸荷载作用下粉煤灰混凝土抗裂性能和机理研究(项目编号:51768058)。

摘　　要：利用石灰、粉煤灰、石膏、砂和水泥制备了蒸压粉煤灰多孔砖,并分析了石灰、粉煤灰、石膏掺量对粉煤灰砖基本力学特性的影响。在此基础上,采用M5、M10和M15砂浆分别制作了多孔砖砌体,利用自制抗震性能测试系统开展了粉煤灰多孔砖墙体的抗震性能试验,分析了多孔砖砌体抗震性能随砂浆等级的变化规律。结果表明:粉煤灰多孔砖的抗折强度以及抗压强度随石灰和石膏掺量的增大呈现先增大后减小的变化规律,而随粉煤灰掺量的增大则呈现先不断增大后趋于稳定的变化规律;力学性能最佳的多孔砖石灰、粉煤灰和石膏掺量分别为20%、50%和6%;蒸压粉煤灰墙体的开裂荷载、极限荷载以及破坏荷载随砂浆等级的提高而增大,开裂位移、极限位移以及破坏位移则随之降低;反复荷载作用下蒸压粉煤灰多孔砖墙体的裂隙数目随着砂浆等级的提高而降低。The autoclaved fly ash porous bricks were prepared from lime, fly ash, gypsum, sand and cement, and the influence of the mass fraction of lime, fly ash and gypsum on the basic mechanical properties of fly ash bricks was analyzed. On this basis, M5, M10 and M15 mortar were used to prepare porous brick masonry, and the seismic performance test of fly ash porous brick wall was carried out with the self-developed seismic performance test system.The change rule of the seismic performance of porous brick masonry with mortar grade was analyzed. The results showed that: The flexural strength and compressive strength of the fly ash porous brick increased first and then decreased with the increase of lime and gypsum mass fraction, while the flexural strength increased first and then tended to be stable with the increase of fly ash mass fraction;When the mass fractions of porous brick lime, fly ash and gypsum were 20%, 50% and 6% respectively, the mechanical properties were the best;Cracking load, ultimate load and failure load of autoclaved fly ash wall increased with the improvement of mortar grade, while cracking displacement, ultimate displacement and failure displacement decreased accordingly;The number of cracks in the autoclaved fly ash porous brick wall decreased with the increase of mortar grade under repeated loads.

关 键 词：粉煤灰 蒸压多孔砖 烧结多孔砖 抗震性能 

分 类 号：TQ178[化学工程—硅酸盐工业]