镍铁粉对水泥水化性能的影响  

Study on the effect of ferronickel powder on hydration performance of cement

作　　者：邢涛 郭飞 陆加越 余兰清 XING Tao;GUO Fei;LU Jiayue;YU Lanqing(Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,China;State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 210008,China)

机构地区：[1]江苏苏博特新材料股份有限公司,江苏南京211103 [2]高性能土木工程材料国家重点实验,江苏南京210008

出　　处：《新型建筑材料》2024年第3期11-14,共4页New Building Materials

摘　　要：采用镍铁渣制成粒径小于0.075 mm的粉体,作为矿物掺合料取代部分水泥,研究镍铁粉不同掺量对水泥水化性能以及强度的影响。XRF分析发现,镍铁粉中含有较多的SiO_(2)、MgO、FeO,具有较高的火山灰活性。镍铁粉的掺入可以较大程度上延缓水泥水化时间,相较空白组,掺30%镍铁粉时,第2个水化放热峰的出现时间延缓8 h左右;降低体系的水化放热量,相较空白组,当镍铁粉掺量为10%、20%、30%时,体系的累计放热量依次下降33%、46%、63%;掺入镍铁粉明显降低试块的抗压强度,但镍铁粉具有二次水化作用,可以使试块后期抗压强度增幅较大,掺20%镍铁粉试块的28 d抗压强度可达到空白组的86%。The ferronickel slag is made into powder with a particle size of less than 0.075 mm,used as a mineral admixture to replace part of the cement,the influence of nickel-iron powder on the hydration performance and strength of cement under different composite ratios was tested.Through XRF analysis,it is found that the nickel-iron powder contains more SiO_(2)-MgO-FeO ternary system,which has good pozzolanic activity.The addition of nickel-iron powder can delay the hydration time of cement to a large extent.Compared with the blank group,the appearance time of the second hydration exothermic peak is delayed by 8h in the system of adding 30%nickel-iron powder.To reduce the hydration heat release of the system,compared with the blank group,when the content of nickel-iron powder was 10%,20%and 30%,the cumulative heat release of the system decreased by 33%,46%and 63%respectively.The addition of nickel-iron powder significantly reduces the compressive strength of the test block,but the nickel-iron powder has a secondary hydration effect,which can improve the later compressive strength of the slurry.In the case of adding 20%nickel-iron powder,the 28 d strength of the test block can reach 86%of the blank group.

关 键 词：镍铁粉 火山灰活性 水化放热量 抗压强度 

分 类 号：TU521[建筑科学—建筑技术科学]