不同掺合料对水泥基复合材料吸波性能的影响OA北大核心

Incorporating suitable wave-absorbing agents into cement and performing appropriate electromagnetic modification is an effective way to realize electromagnetic wave-absorbing.In this paper,cement-based composites were prepared with slag,graphite and ferrite as wave-absorbing agents,and mechanical property test,microstructure test and reflectance test were carried out to investigate the effects of different dopants and sample thickness on the wave-absorbing properties and mechanical properties of cement-based composites.The results show that the cement-based composites have the best wave-absorbing performance when the doping of slag is 30％(mass fraction)and graphite is 5％(mass fraction),and there exists the best matching layer thickness.The reflection loss is-40.84 dB at 2.65 GHz when the thickness is 36 mm.When the cement-based composite is composed of 30％slag,10％(mass fraction)ferrite,and the matching layer thickness is 36 mm,the cement-based composites have the lowest reflectivity of-26.63 dB at 2.53 GHz.Both slag and ferrite reduce the strength of cement-based composites,and graphite(no more than 5％)is able to fill in mortar pores at the early stage of cement hydration,which enhances early mechanical properties.