镍矿渣地聚合物的制备及其增韧改性

以工业固体废渣-水淬镍渣为主要原料,在碱激发剂作用下制备地聚合物.通过加入矿渣和纤维的方法对镍渣地聚合物的力学性能进行优化,并通过孔结构测试、断面形貌分析等方法,对矿渣的增强作用和纤维的增韧作用进行研究.结果表明:矿渣的掺入有利于镍渣地聚合物抗压强度的提高和内部孔径结构的改善.50 ℃养护7 d时,与镍渣地聚合物相比,矿渣掺量为50％的镍矿渣地聚合物的抗压强度提高了209.7％,总孔隙率和最可几孔径尺寸分别降低了32.7％和53.1％.PP纤维的掺入能有效提高镍矿渣地聚合物的韧性,当纤维掺量为1.6％时,50 ℃养护7 d的镍矿渣地聚合物抗折强度和抗冲击功分别较未掺纤维试样提高了42.0％和114.3％,基体中纤维的拔出和拉断消耗了荷载能量,提高了地聚合物的抗裂能力.

Preparation and Toughening Modification of Nickel Slag-Blast Furnace Slag Geopolymers

Nickel slag,a class of industrial wastes,was used as a major solid precursor in conjunction with an alkaline activator to produce the geopolymers.The mechanical properties of geopolymers were improved through the inclusion of blast furnace slag and fiber,and the strengthening and toughening effects were investigated by characterizing the pore structure and microstructure of the binders.The results show that an increase of compressive strength and the refinement of the inner pore structure of the geopolymers are mainly due to blast furnace slag addition.In comparison with the 50 ℃ 7 d-cured nickel slag-based geopolymers,the compressive strength of geopolymers with 50％blast furnace slag content increases by 209.7％,and the total porosity and maximal distribution pores diameter reduced by 32.7％and 53.1％,respectively.The inclusion of fiber is efficient in improving the toughness of the binders.When the fiber dosage is 1.6％,the flexural strength and impact work of the 50 ℃ 7 d-cured geopolymers increase by 42.0％and 114.3％,respectively.Pull-out and tensile fracture of the fiber in the binders consumed the loading energy,resulting in an improvement of the crack resistance of geopolymers.