摘要
目的研究不同的再生骨料替代率对再生双通孔抗震砖基本物理力学性能的影响,提升当前墙体材料的耐水性、抗冻性以及优秀的抗压性能.方法采用新型连续级配方法,将村镇破碎废弃的烧结黏土砖经多破碎预处理后,作为再生骨料,制备再生双通孔抗震砖.对再生双通孔抗震砖的含水(吸)水率、干燥收缩率、饱和系数、抗压强度以及抗折强度进行测试.结果随着再生骨料替代率的增加,再生双通孔抗震砖的含水率、吸水率、干燥收缩率逐渐增大,其中含水率为9.6%,吸水率为19.7%,干燥收缩值达到0.51而其28 d抗压强度和抗折强度呈现递减的趋势,当再生骨料替代率为40%时,再生双通孔抗震砖的力学性能要好于其他替代率,其抗压强度峰值达到35 MPa.结论除100%替代率制备的再生双通孔抗震砖外,按照0～80%替代率生产的再生双通孔抗震砖的主要性能已达到国家标准《混凝土实心砖》(GB/T 211444-2007)的要求.
For improving the durability and mechanical properties of current wall materials, the paper investi- gated effect of different replacing rate of recycled aggregation on bi-via seismic brick. In this work, a new continuous grading method was adopted to prepare raw materials including pretreatment of smashing aban- doned sintered clay bricks to pieces. As recycled aggregation, the smashed bricks were used for producing re- cycled bi-via seismic brick. Measurements were done on its water absorption, moisture content, drying shrinkage, saturation coefficient, compressive strength and flexure strength. The results show that, with more aggregations are replaced by the recycled bricks, some properties of the recycled bi-via seismic brick are en- hanced,such as moisture content of 9. 6% ,water absorption of 19.7% and drying shrinkage of 0. 51 ,while some properties gradually weakened, such as compressive strength and flexure strength of 28d. When the re- placing rate is 40%, the seismic brick performed the best mechanical properties of 35MPa compressive strength. Besides the 100% recycled bi-via seismic brick,recycled bi-via seismic bricks with aggregation re- placing rate of 0 ~ 80% can all meet the government standard for ordinary concrete solid brick （GB/T 211444-2007 ）.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2013年第3期501-506,共6页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家十二五科技支撑计划重大项目(2012BAJ20B03)
辽宁省教育厅基金项目(LR2011013)
关键词
废弃黏土砖
再生骨料
替代率
双通孔抗震砖
abandoned clay brick
recycled aggregates
replacing rate
bi-via seismic brick
