CAJ | 학술논문

尾矿和天然河砂可以填补机制砂中细颗粒的不足并与机制砂组成级配良好的混合砂。本试验研究了河砂和铜尾矿取代机制砂制备混合砂的MB值、级配及不同水灰比下砂浆的性能。结果表明：混合砂MB值随河砂取代量的增加而降低，随铜尾矿取代量的增加而增加；河砂使混合砂中粉料含量降低、细度模数略有降低，而铜尾矿使混合砂粉料含量增加、细度模数降低；砂浆稠度随着河砂取代量的增加而降低，而随铜尾矿的增加而增大；河砂或铜尾矿掺入机制砂时，砂浆抗折抗压强度均有所提高；相同流动度下，掺入河砂砂浆的干缩率减低，而掺入铜尾矿则使其增加。
미광화천연하사가이전보궤제사중세과립적불족병여궤제사조성급배량호적혼합사。본시험연구료하사화동미광취대궤제사제비혼합사적MB치、급배급불동수회비하사장적성능。결과표명：혼합사MB치수하사취대량적증가이강저，수동미광취대량적증가이증가；하사사혼합사중분료함량강저、세도모수략유강저，이동미광사혼합사분료함량증가、세도모수강저；사장주도수착하사취대량적증가이강저，이수동미광적증가이증대；하사혹동미광참입궤제사시，사장항절항압강도균유소제고；상동류동도하，참입하사사장적간축솔감저，이참입동미광칙사기증가。
The copper tailings and natural river sand were added in the manufactured sand to modify the poor particle gradation of manu-factured sand,and mixed sands with fine gradation were prepared.The MB values and the gradation of mixed sands and the properties of mixed sand mortar with different water-cement ratio were studied.Results indicated that the MB values of mixed sands,the mortar consis-tency and the powder content decreased with the increase of replacement ratio of river sand for manufactured sand,but increased with the increase of replacement ratio of copper tailings.When river sand and copper tailings were used to replace part of manufactured sand,the flexural strength and compressive strength of mortar increased.With similar spread value,the replacement of river sand decreased mortar drying shrinkage while the copper tailings increased it slightly.