摘要
水在混凝土孔隙中的传输是造成其性能劣化的主要原因。将芬顿造纸污泥在高温下煅烧,冷却后与硬脂酸球磨活化得到改性芬顿造纸污泥灰(M-PSA)。将M-PSA按不同比例等量取代普通硅酸盐水泥制备混凝土,研究其毛细吸水和力学性能,利用XRD、SEM/EDS、FT-IR分析M-PSA成分及其混凝土中胶凝材料的水化机理。结果表明掺量为4%时,M-PSA中的活性Al、Si成分及铁酸钙、铁铝酸钙可促使水泥混凝土生成更多的C-S-H,改善界面性能,并通过憎水基团的接入降低混凝土的毛细吸水量,同时提高早期抗压强度且不降低长期强度,劈裂抗拉强度仅有小幅下降。M-PSA可作为掺合料等量取代普通硅酸盐水泥,改善混凝土的毛细吸水特性,在防水或耐久性要求高的工程中应用。
Transmission of moisture in capillaries is a main reason for deterioration of concrete.A new-modified PSA（M-PSA）,made from Fenton paper mill sludge through high temperature heating and cooling before mixed stearic aci,was modified by ball-milling.The M-PSA replacing the ordinary portland cement in varying proportions were used to made up concrete together with aggregate,and then the performances of capillay water absorption and mechanism of the concrete were tested.Compositions and hydration mechanism of the M-PSA and the concrete were analyzed by XRD,SEM/EDS and FT-IR.The results show that when the content of MPSA reaching up to 4%,there are the more C-S-H and the better interface performance in concrete due to the active ingredients of Al and Si,calcium ferrite and calcium ferroalumnates from the M-PSA,at the same time the lower water adsorption since the introducing of hydrophobic group then CON.Early compressive strengths of the concrete are increased by replacing M-PSA,which have no effect on the long-term compressive strength,in spite of the slight decrease of splitting-tensile strength.M-PSA can act as a concrete admixture by adopting isometric substitute of ordinary portland cement to improve the water absorption characteristics of concrete,thereby applying to engineering with high waterproof or durability requirement.
作者
李春光
曾剑锋
刘振中
余立军
贺明强
潘旺
林煜臻
LI Chunguang;ZENG Jianfeng;LIU Zhenzhong;YU Lijun;HE Mingqiang;PAN Wang;LIN Yuzhen(School of Nuclear Resource Engineering,University of South China,Hengyang 421001,China;School of Environmental and Safety Engineering,University of South China,Hengyang 421001,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2018年第8期8143-8149,共7页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50874063)
南华大学研究性学习与创新性资助项目(2016115)
南华大学核资源与环境大学生创新训练中心创新实验计划资助项目(201624)
关键词
芬顿造纸污泥
硬脂酸
力学性能
毛细吸水
机理
fenton paper mill sludge
stearic aci
mechanical property
capillary water adsorption
mechanism
