免蒸压免烧结粉煤灰多孔砖砌体力学性能试验研究

Experimental study on mechanical properties of non-autoclaved and non-sintered fly-ash perforated brick masonry

免蒸压免烧结粉煤灰多孔砖是一种新型承重墙体材料,为使其在地震区村镇建筑中得到推广应用,进行了多孔砖砌体抗压强度和抗剪强度试验,分析了砌体裂缝开展及破坏过程。试验结果表明:免蒸压免烧结粉煤灰多孔砖砌体的受压、受剪破坏过程及特征与普通黏土砖砌体类似,但具有更大的脆性;抗压、抗剪强度均小于普通黏土砖砌体;采用6次多项式的受压本构关系数学模型,反映了免蒸压免烧结粉煤灰多孔砖砌体受压应力-应变全过程,计算值与实测数据比较接近。

Non-autoclaved and non-sintered fly-ash perforated brick is a kind of new material for load-bearing walls.In order to promote the application of this new material in village and town buildings of seismic area,compression and shear strength of non-autoclaved and non-sintered fly-ash perforated brick masonry was tested and crack and failure progress was analyzed.The test results show that the failure processes and characteristics of the non-autoclaved and non-sintered fly-ash perforated brick masonry in compression and in shear are similar to that of the common brick masonry,however the non-autoclaved and non-sintered fly-ash perforated brick masonry tends to fail in brittle manner.The compression and shear strength are all less than that of the common brick masonry.A mathematic model of 6-degree polynomial was used to express the compressive constitutive relationship and the whole process of non-autoclaved and non-sintered fly-ash perforated brick masonry in compression was described.The curve was close to the measured data.