Effects of nano-SiO2 and nano-Al2O3 on mechanical and durability properties of cement-based materials: A comparative study

The results showed that the compressive strength of compound-doped NS + NA mortar was always higher than that of single-doped NS and NA from 3 days to 180 days, and the capillary permeability coefficient decreased obviously for the composite nanomaterials

Ai Zhang; Wencui Yang; Yong Ge; Yuanbo Du; Penghuan Liu

2020

Scholarcy highlights

  • Cement-based materials refer to engineering materials using cement as cementitious materials
  • The results showed that the compressive strength of compound-doped NS + NA mortar was always higher than that of single-doped NS and NA from 3 days to 180 days, and the capillary permeability coefficient decreased obviously for the composite nanomaterials
  • The following conclusions could be drawn from the obtained experimental data:
  • The setting times of the systems single-doped with 2% and 3% NA and the system compound-doped with NA + NS at 3% were longer than that of the control group
  • The results reveal that the shielding properties can be visibly enhanced by the addition of carbon black and steel fibers, and the maximum shielding efficiency of 73.7 dB and average SE of 59.3 dB of the graphite/cement composite with 1 % CB and 30 % steel fibers can be obtained, and the bandwidth for SE > 50 dB reaches 14 GHz
  • After 300 freeze-thaw cycles, the length loss, weight loss and water absorption of the samples with nanomaterials were less than 10%, 20% and 50% respectively
  • This study investigated the feasibility of using waste glass powder as a partial precursor in fly ash and ground granulated blast furnace slag based alkali activated mortars cured at ambient condition
  • The formation of additional AFm phases increases solid volume, reduces porosity and refines pore structure in the cement paste, leading to an enhancement of strength at later ages

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