成孔剂对烧结页岩砖性能的影响  

Influence of Pore-forming Agents on the Properties of Sintered Shale Brick

作　　者：谢厚礼[1,2] 彭家惠[1] 郑云[1] 陈燕[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆市建设技术发展中心,重庆400015

出　　处：《土木建筑与环境工程》2012年第2期149-154,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：重庆市"十一五"科技发展规划重大专项(2008AA4023)

摘　　要：选用锯末、煤矸石和造纸污泥作为烧结页岩砖的成孔剂,系统研究不同成孔剂的热解特性及其对页岩烧结砖的可塑性、体积密度、抗压强度、显孔隙率、吸水率等性能的影响。结果表明:随着锯末掺量的增加,烧结砖中孔隙数量增加,同时其体积密度和强度迅速下降,吸水率增加,因而掺量应控制在6%以内;煤矸石可塑性较差,烧失量较小,烧结页岩砖的孔隙率低,从而导致其吸水率低,体积密度和强度降低幅度都较小,实际生产中可根据内燃砖发热量和可塑性要求,适量掺加煤矸石;造纸污泥的可塑性较好,随着掺量增加混合料的可塑性变大,但掺量过大成型搅拌困难且烧结砖的收缩大,强度降幅大,吸水率大,因而掺量应不超过7%。Sawdust,coal gangue and paper sludge were chosen as pore-forming agents of sintered shale brick.The pyrolysis behaviors of different forming agents were studied and the influences of the agents on bulk density,compressive strength,porosity,and water absorption properties of the shale brick were also investigated.It is shown that,with the increase of the dosage of sawdust,pore number of the sintered bricks and water-absorption increase,while the volume density and strength fall rapidly.Thus,the dosage of sawdust should be controlled within 6%.Because of poorer plasticity and lower ignition of coal gangue as well as low porosity rate of sintered bricks,the water-absorption of sintered bricks is poor,and decreases of density and strength are not obvious.In practical production,according to the requirements of brick-making heat and plasticity,a moderate amount of coal gangue can be added.The plasticity of the bricks improves as the dosage of paper sludge increases due to its good plasticity.However,excessive dosage of paper sludge will result in large shrinkage of sintered brick,low strength and high water absorption;therefore,the dosage should not exceed 7%.

关 键 词：烧结页岩砖 成孔剂 可塑性 热解特性 

分 类 号：TU522.1[建筑科学—建筑技术科学]