Hydration properties of Portland cement-copper tailing powder composite binder

2020 ◽  
Vol 251 ◽  
pp. 118882 ◽  
Author(s):  
Shuhua Liu ◽  
Lu Wang ◽  
Qiaoling Li ◽  
Junwei Song
Keyword(s):  
Portland Cement ◽  
Powder Composite ◽  
Hydration Properties ◽  
Composite Binder

Development of Fibre-Cement Composites with Self-Cleaning and de-NOx Ability

2015 ◽  
Vol 1124 ◽  
pp. 123-129
Author(s):  
Martin Bohac ◽  
René Čechmánek ◽  
Theodor Staněk
Keyword(s):  
Portland Cement ◽  
Cement Composites ◽  
Composite Binder ◽  
Fibre Cement ◽  
Thin Walled ◽  
Self Cleaning ◽  
White Portland Cement

Paper deals with development of face architectural fibre-cement composites based on white Portland cement with addition of photoactive TiO2. Tests were carried on composite binder and then on the composites. The role of TiO2 on performance of materials was monitored. Selected composites were tested on self-cleaning ability, de-NOx activity and resistance to weathering in outdoor conditions. Two series of thin-walled products based on developed composites were prepared with self-cleaning ability and de-NOx activity.

Incorporation mechanism of titanium in Portland cement clinker and its effects on hydration properties

2017 ◽  
Vol 146 ◽  
pp. 344-349 ◽  
Author(s):  
Dechen Shang ◽  
Maoguo Wang ◽  
Zhongsheng Xia ◽  
Shuguang Hu ◽  
Fazhou Wang
Keyword(s):  
Portland Cement ◽  
Cement Clinker ◽  
Hydration Properties ◽  
Portland Cement Clinker

The effect of gyrolite additive on the hydration properties of Portland cement

2012 ◽  
Vol 42 (1) ◽  
pp. 27-38 ◽  
Author(s):  
A. Eisinas ◽  
K. Baltakys ◽  
R. Siauciunas
Keyword(s):  
Portland Cement ◽  
Hydration Properties

scholarly journals Hydration Properties of Portland Cement Paste with Boron Gangue

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Quan Zhao ◽  
Jianwei Tu ◽  
Weiwei Han ◽  
Xi Wang ◽  
Youzhi Chen
Keyword(s):  
Portland Cement ◽  
Cement Hydration ◽  
Setting Time ◽  
High Strength ◽  
Cementitious Materials ◽  
Radiation Shielding ◽  
Boron Compounds ◽  
Hydration Properties ◽  
Materials Used ◽  
Low Solubility

In order to prepare a good radiation shielding concrete with a proper setting time and a high strength, the hydration properties of cement with boron gangue were investigated by the methods of XRD, isothermal microcalorimetry, TG/DSC, and FTIR. The results demonstrated that it was mainly related to the insoluble matter CaB2O4·4H2O and Ca(H2BO3)2·4H2O that boron gangue could severely inhibit the cement hydration. Boron gangue made a significant retardation on Portland cement hydration with the form of BO33− and BO45−, which caused an obvious retardation of C3A and C3S hydration with an insoluble coat and a low solubility of calcium ion in the solution. Therefore, it is important and necessary to take into consideration the chemistry of borates in aqueous and the kind of cement-based or cementitious materials used for radiation shielding concrete with boron or boron compounds, especially for the materials with a high content of C3A and C3S.

scholarly journals The Influence of Mayenite Employed as a Functional Component on Hydration Properties of Ordinary Portland Cement

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1958 ◽  
Author(s):  
Zhen He ◽  
Yang Li
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
X Ray Diffraction ◽  
Hydration Properties ◽  
Functional Component ◽  
X Ray ◽  
Consumption Rates ◽  
Hydrated Products ◽  
Experimental Findings ◽  
Good Agreement

Influence of C12A7 (12CaO·7Al2O3) as a functional component on hydration properties of Ordinary Portland Cement is studied using isothermal microcalorimetric technique, X-ray diffraction analysis, and thermodynamic calculation. Meanwhile, hydrate assemblages are simulated by hydrothermal software. C2AH8 (2CaO·Al2O3·8H2O) is generated as a transition phase during the hydration of pure C12A7, while formation of CAH10 (CaO·Al2O3·10H2O) is uncertain. Heat-releasing behavior of Ordinary Portland Cement (OPC) could be noticeably affected by C12A7, especially for the duration of interaction at boundary stage reduces with C12A7 replacement. Correspondingly, all hydration kinetic parameters first increase and then diminish with C12A7 replacement. Simulation results manifest in the main hydration products of OPC being ettringite, C-S-H (Calcium-Silicate-Hydrate) gel, portlandite and brucite. Increasing C12A7 replacement accelerates the consumption rates of gypsum and calcite that are typically included in OPC, and thus the ettringite content is changed and carbonate phases will be produced. Therefore, the microstructure properties of hydrated products of OPC are affected and the compressive strength is influenced. These predications are in good agreement with experimental findings. C12A7 can be used as a functional component to adjust the consumption rate of suphates in OPC, and also components of carbonate phases can be modified in hydrate assemblage.

scholarly journals The influence of Triethanol amine and ethylene glycol on the grindability, setting and hydration characteristics of Portland cement

2019 ◽  
Vol 4 (3) ◽  
pp. 81-88
Author(s):  
Fayza S Hashem ◽  
Eisa E Hekal ◽  
M Abd El Wahab
Keyword(s):  
Ethylene Glycol ◽  
Portland Cement ◽  
Water Demand ◽  
Cement Hydration ◽  
Hydration Properties ◽  
Grinding Mills ◽  
Setting Times ◽  
Grinding Aids ◽  
Triethanol Amine ◽  
Hydration Characteristics

Triethanol amine and ethylene glycol are used as grinding aids for Ordinary Portland Cement (OPC). Standard water of consistency, Blaine area, initial and final setting times and compressive strength are tested for OPC. The phase composition and microstructure of the formed hydrates are tested using DTA/TG and SEM techniques. Results showed that both the two GAs had a significant improvement in the performance of grinding mills. This is indicating by higher Blaine area when a dose of 0.03, 0.04 and 0.05wt. % are applied. Beside there are increase in the water demand (greater than 5%) for the all OPC mortar mixes admixed with triethanol amin or ethylene glycol at concentrations less than 0.05 wt.%. The improved hydration properties are reflected by an increase in the mechanical properties and microstructure of the mortar pastes admixed with the two GAs. This is with attributed to the increase in the cement fineness which leads to the progress in the degree of cement hydration.

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