Study on the effects of the recycled micronized powder and mineral admixtures on the microstructure of cement paste
To promote the development of resource utilization of construction waste,Nuclear Magnetic Resonance(NMR)and mercury compression are adopted to explore the effects of the recycled mi-cronized powder and mineral admixtures mixed in different proportions on the microstructure of ce-ment paste and cement mortar.The results show that when the recycled micronized powder is added to cement paste alone,the porosity of paste increases with the increase of dosage.The number of harmless and harmful pores inside the paste decreases.In addition,the number of harmful and multi-ple harmful pores increases with poor internal structure density.When the recycled micronized pow-der is added to cement mortar alone,the average radius and total porosity of mortar increase with the increase of dosage.Compared with S0,the total porosity and average radius of S3 increase by 44.2％and 50.3％respectively.Compared to single mixed mortar,the total porosity and average radius show a decreasing trend after adding fly ash and silica fume.Compared to S0,the total porosity and ave-rage radius of FS1 decrease by 18.1％and 7.8％respectively.The combination of the recycled mi-cronized powder and mineral admixtures can effectively improve the pore structure of cement paste,thereby reducing the consumption of cement.
cement pasterecycled micronized powderpore structureNuclear Magnetic Resonance(NMR)mercury compression
NETL
NSTL
万方数据
