摘要
再生微粉具有潜在活性,可作为辅助性胶凝材料取代水泥,但活性低限制了其应用。采用物理-化学复合活化方法激发再生微粉的活性,研究了活化再生微粉的活性指数、力学性能和微观形貌。结果表明:随着研磨时间的延长,胶砂的抗压、抗折强度先提高后降低;当研磨时间为4 h时胶砂试块的28 d抗压强度为28.6 MPa,28 d活性指数为64.3%。采用物理-化学复合活化时,当研磨4 h且掺加1%Na2SO4+1%Ca(OH)2激发剂时,胶砂28 d抗压强度为35.2 MPa,28 d活性指数达到79.1%,再生微粉的活性显著提高。
Recycled micro-powder has potential activity and can be used as an auxiliary cementitious material to replace cement,but its application is limited by its low activity.Therefore,in this paper,the activity index,mechanical properties and micro-morphology of the regenerated fine powder were studied by physical-chemical method.The results showed that with the increase of grinding time,the compressive and flexural strength of mortar increased at first and then decreased;when the grinding time was 4 h,the 28 d compressive strength was 28.6 MPa,the activity index was 64.3%.When using physical-chemical composite activation,when grinding for 4 h and adding 1%Na2SO4+1%Ca(OH)2 activator,the 28 d compressive strength of the mortar test block was 35.2 MPa,the activity index was 79.1%,thus significantly improving the activity of the recycled fine powder.
作者
马稚童
高敏
郭启龙
陈业照
杨然
汪造璇
MA Zhitong;GAO Min;GUO Qilong;CHEN Yezhao;YANG Ran;WANG Zaoxuan(College of Civil Engineering,Northwest University for Nationalities,Lanzhou 730124,China;Gansu Key Laboratory of New Building Materials and Building Energy Conservation,Lanzhou 730124,China)
出处
《新型建筑材料》
2024年第1期29-33,69,共6页
New Building Materials
基金
甘肃省自然科学基金(20JR5RA510)
西北民族大学引进人才项目(Z14013)
西北民族大学国家级大学生创新创业训练计划资助项目(202210742017)。
关键词
再生微粉
物理-化学复合活化
力学性能
活性指数
水化产物
显微结构
regenerated micro powder
physical-chemical complex solution-activation
mechanical properties
activity index
hydration products
microstructure
