碱激发矿渣-铜渣体系的力学及干缩性能

Mechanical Properties and Drying Shrinkage Properties of Alkali Activated Slag-Copper Slag System

为寻求碱激发矿渣-铜渣复合胶凝材料的最佳掺量,并在保证碱激发复合砂浆强度的同时提高干缩性能,制备了不同铜渣掺量的碱激发矿渣-铜渣复合胶砂试件,研究了铜渣掺量对复合胶凝材料凝结时间、力学性能和干燥收缩率的影响规律,并通过加入不同碱性激发剂,对比分析了碱性激发剂对矿渣-铜渣复合胶凝材料的活化效果。结果表明:铜渣的掺入能够有效解决碱激发矿渣胶凝材料凝结速度快、干缩变形大的问题;随着铜渣掺量的增加,碱激发矿渣-铜渣复合胶凝材料的抗折、抗压强度先减小后增大再减小。当铜渣掺量为30%时,水玻璃对矿渣-铜渣复合胶凝材料的激发效果最佳,28 d抗折、抗压强度分别高达8.68 MPa、62.45 MPa。

In order to seek the optimal dosage of alkali-activated slag-copper slag composite cementitious material and to improve the drying and shrinkage properties while ensuring the strength of alkali-activated composite mortar,alkali-inspired slag-copper slag composite cementitious sand specimens with different copper slag dosages were prepared.The influence law of copper slag dosing on the setting time,mechanical properties and drying shrinkage rate of composite cementitious materials was studied,and the activation effect of alkaline exciters on slag-copper slag composite cementitious materials was comparatively analyzed by adding different alkaline exciters.The results showed that the admixture of copper slag could effectively solve the problem of fast setting speed and large dry shrinkage deformation of alkali-activated slag cementitious materials;with the increase of copper slag admixture,the flexural and compressive strengths of alkali-activated slag-copper slag composite cementitious materials firstly decreased,then increased and then decreased.When the dosage of copper slag was 30%,water glass had the best excitation effect on slag-copper slag composite cementitious material,and the 28 d flexural and compressive strengths were as high as 8.68 MPa and 62.45 MPa respectively.