摘要
为了将湖泊淤泥烧结砌块作为护岸材料应用于河道护岸工程,砌块应有较高的抗压强度和优异的耐久性,满足水利工程的服役寿命要求.湖泊淤泥塑性指数高,干燥收缩大,烧结制品强度低,需选择合适的掺合料对淤泥进行改性.本文以湖泊淤泥为主要原材料,页岩、煤矸石、煤渣、砖粉、煤粉等作为掺合料,通过陈化、成型、干燥、焙烧等工艺得到6组烧结样砖,分别测试样砖的干燥收缩、体积密度、抗压强度、吸水率和抗冻融等物理力学性能,结合微观形貌分析发现,分别掺入10%页岩和10%砖粉的砖坯的成型性能较好,烧结后的样砖具有较高的抗压强度和优异的耐久性能.掺入2%煤粉的样砖的各项性能均下降,应限制煤粉在淤泥烧结驳岸砌块中的使用.最后,在生产线上进行淤泥烧结驳岸砌块的中试生产,其性能满足相关的技术标准和实际工程需要,并将驳岸砌块应用在生态河道护岸工程.
In order to be used as ecological river bank protection materials, sintered block should have a high compressive strength and excellent durability to meet the designed service life of hydraulic engineering. Lake sediment is of high plasticity, high drying shrinkage and its final sintered product has low compressive strength. It is therefore necessary to choose appropriate blending material to compensate the shortcomings of lake sediment. In this paper, shale, gangue, coal cinder, brick powder and coal were selected as blender of the lake sediment. Six mixtures were formed, dried and then fired at 925 ℃ to produce bricks. Properties such as drying shrinkage, loss on ignition, bulk density, compressive strength, water absorption, freeze-thaw resistance were determined. Crystal phases and microstructures of the six samples were studied by XRD and SEM. It is found that the samples containing 10% shale or 10% brick powder present the best physical and mechanical properties and excellent durability, which meet the needs of ecological bank protection materials used in hydraulic engineering. Considering the inferior properties of samples with 2% coal, it is not recommended to use coal as internal fuel to produce sintered block for ecological bank protection materials. Finally, sintered blocks from lake sediment were produced in the manufacturing line in factory and were used in ecological river bank protection engineering.
作者
张亚梅
梅浩
王月华
马敖顺
夏春跃
ZHANG Yamei;MEI Hao;WANG Yuehua;MA Aoshun;XIA Chunyue(School of Materials Science and Engineering,Southeast University,Nanjing 210000,China;Taizhou Polytechnic College,Taizhou 225300,China;Jangsu Baoneng Building Materials Co Ltd,Changzhou 213000,China;Jintan Survey and Design Institute of Water Conservancy,Jintan 213200,China)
出处
《湖南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2018年第6期106-112,共7页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51378115)~~
关键词
湖泊淤泥
掺合料
抗压强度
耐久性
微观形貌
lake sediment
admixture
compressive strength
durability
microstructure