sahar mohamed ibrahim abdelhameed
Lecturer
Characterization, hydration, durability of nano-Fe2O3-composite cements subjected to sulphates and chlorides media
Construction and Building Materials • 2021
Publication Information
Authors
Mohamed Heikal; Magdi E.A. Zaki; Sahar M. Ibrahim
Keywords
Nano-Fe2O3-particles;Characteristics; Mechanical properties; Microstructure and durability
Journal
Construction and Building Materials
Publisher
Not Available
Volume
Not Available
Issue
Not Available
Pages
Not Available
publication.type
International
Paper Link
Open Link
Supplementary Materials
Not Available
Abstract
The work aimed to study the impact of nano-Fe2O3 on the characteristics and durability resistance
against SO4
2 or Cl anions attack. Nano-Fe2O3 prepared from the heating of Fe(CH3COO)2OH at 300 C
(NFI) and 450 C (NFII) at soaking time 2hrs. The prepared nano-Fe2O3 showed the accumulation of hematite and fine-ferrihydrite crystals having grain size of 10-20 nm. Physico-mechanical, chemical,
microstructure, and durability were investigated. The compressive strength and chemically combined
water contents increased upto 1.0 mass% nano-Fe2O3. The increase of nano-Fe2O3 upto 2%, the values
of combined water contents decreased, however these values are larger than those of neat-OPC paste.
The portlandite reduction of nano-Fe2O3-composite pastes prepared at 300 C are higher than those of
prepared at 450 C. Mix having 1.0 mass% nano-Fe2O3 (NFI2) contributed the lower porosity values than
specimens containing 1.5 and 2.0 mass% nano-Fe2O3 processed at 300 C. Nano-Fe2O3 improves the durability of nano-Fe2O3-composite pastes towards SO4
2 or Cl ions attack. Mixes containing 0.5–1.0% nanoFe2O3 showed the lower values of total sulphate and total chloride contents, due to formation of a denser
and finer-matrix with lower porosity, which blocked the empty pores for the diffusion of SO4
2 or Cl ions,
hence they showed the higher values of compressive strength and bulk density
against SO4
2 or Cl anions attack. Nano-Fe2O3 prepared from the heating of Fe(CH3COO)2OH at 300 C
(NFI) and 450 C (NFII) at soaking time 2hrs. The prepared nano-Fe2O3 showed the accumulation of hematite and fine-ferrihydrite crystals having grain size of 10-20 nm. Physico-mechanical, chemical,
microstructure, and durability were investigated. The compressive strength and chemically combined
water contents increased upto 1.0 mass% nano-Fe2O3. The increase of nano-Fe2O3 upto 2%, the values
of combined water contents decreased, however these values are larger than those of neat-OPC paste.
The portlandite reduction of nano-Fe2O3-composite pastes prepared at 300 C are higher than those of
prepared at 450 C. Mix having 1.0 mass% nano-Fe2O3 (NFI2) contributed the lower porosity values than
specimens containing 1.5 and 2.0 mass% nano-Fe2O3 processed at 300 C. Nano-Fe2O3 improves the durability of nano-Fe2O3-composite pastes towards SO4
2 or Cl ions attack. Mixes containing 0.5–1.0% nanoFe2O3 showed the lower values of total sulphate and total chloride contents, due to formation of a denser
and finer-matrix with lower porosity, which blocked the empty pores for the diffusion of SO4
2 or Cl ions,
hence they showed the higher values of compressive strength and bulk density