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.

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 Use of Boron Compounds as Grinding Aids with Alcohol Amines and Their Effect on Portland Cement Setting Points

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Murat Çallı ◽  
Erol Pehlivan
Keyword(s):  
Portland Cement ◽  
Boric Acid ◽  
Boron Compounds ◽  
Set Point ◽  
Setting Times ◽  
Retarding Effect ◽  
Grinding Aids ◽  
Initial Setting ◽  
Cement Grinding ◽  
Cement Setting

Milling aids have been predominantly developed to increase the performance or grinding capacity of cement products, and alcohol amines have been used as grinding aids in cement grinding processes for many years. Moreover, the setting point of cement produced with grinding aids is most often changed. In this study, the effects of alkanolamines and boron compounds in different mixing amounts as grinding aids on the set point of cement were researched. Triethanolamine (TEA) and triisopropanolamine (TIPA) were used as alkanolamines and boric acid (BA) and anhydrous borax (AHB) as the boron compounds. It is evident that BA with TEA had a small effect on the cement setting point where the former decreased the retarding effect of the latter, but BA had no effect with TIPA. AHB decreased the retarding effect of TEA but had no effect with TIPA on setting times. When the boron compounds were added to TEA, they accelerated the initial setting points of cement by 15 to 20 minutes and the final setting points by 25 to 30 minutes according to the amount of TEA used.

EFFECT OF VISCOSITY MODIFIER ADMIXTURE ON PORTLAND CEMENT HYDRATION

2018 ◽  
Author(s):  
Stefan C. Figueiredo ◽  
Oğuzhan Çopuroğlu ◽  
Erik Schlangen
Keyword(s):  
Portland Cement ◽  
Cement Hydration ◽  
Viscosity Modifier ◽  
Portland Cement Hydration

scholarly journals Industrial versus Laboratory Clinker Processing Using Grinding Aids (Scale Effect)

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Joseph Jean Assaad
Keyword(s):  
Scale Effect ◽  
Setting Time ◽  
Specific Energy Consumption ◽  
Cement Particle ◽  
Actual Performance ◽  
Laboratory Conditions ◽  
Grinding Mills ◽  
Grinding Aids ◽  
Operational Modes ◽  
Real Scale

The evaluation of grinding aid (GA) effect on clinker processing in laboratory grinding mills is relatively simple. Yet, the results obtained cannot be directly transposed to industrial mills, given the fundamentally different operational modes and grinding parameters. This paper seeks to evaluate the scale effect by comparing the results obtained from a closed-circuit tube mill operating at 90 ton/hr to those determined using a 50-liter laboratory mill. Tests results have shown that the decrease in specific energy consumption (Ec) due to glycol or amine-based GA can be evaluated under laboratory conditions. However, such tests underestimate the actual performance that could be achieved in real-scale mills; the Ec reduction due to GA is around twofold higher when grinding is performed in real-scale mill. Compared to industrial tests, the cement particle size distribution curves widened and shifted towards higher diameters when grinding was performed under laboratory conditions, particularly with GA additions. This led to remarkable changes in water demand, setting time, and 1- and 28-day compressive strengths.

scholarly journals Effect of Some Acrylate—Poly(Ethylene Glycol) Copolymers as Superplasticizers on the Mechanical and Surface Properties of Portland Cement Pastes

2005 ◽  
Vol 23 (3) ◽  
pp. 245-254 ◽  
Author(s):  
S.A. Abo-El-Enein ◽  
S. Hanafi ◽  
F.I. El-Hosiny ◽  
El-Said H.M. El-Mosallamy ◽  
M.S. Amin
Keyword(s):  
Ethylene Glycol ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Mechanical Characteristics ◽  
Hardened Cement ◽  
Poly Ethylene Glycol ◽  
Cement Pastes ◽  
Surface Areas ◽  
Poly Ethylene ◽  
Hardened Cement Pastes

Ordinary Portland cement (OPC) pastes with added superplasticizer were made using water/cement weight ratios of standard consistency. Three types of superplasticizer based on acrylate—poly(ethylene glycol) copolymers were used. The pastes were hydrated for various time lengths and the mechanical characteristics of the hardened cement pastes were studied and related to their pore structures. It was found that the addition of the superplasticizers to OPC improved the mechanical properties of the hardened pastes for all hydration lengths. The addition of such superplasticizers to OPC resulted in a decrease in the specific surface areas and total pore volumes of the hardened superplasticized cement pastes relative to the corresponding hardened neat cement pastes.

scholarly journals In Vitro Bioactivity and Setting Times of White Portland Cement Combined with Different Radio Pacifying Agents

2017 ◽  
Vol 109 ◽  
pp. 03003 ◽  
Author(s):  
Nichola Jayne Coleman ◽  
Rajitha Hanarasinghe ◽  
Zeynep Aslı Güçlü ◽  
Samantha Ellen Booth
Keyword(s):  
Portland Cement ◽  
In Vitro Bioactivity ◽  
Setting Times ◽  
White Portland Cement
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