The use of lead tailings as raw material for clinker preparation can reduce the calcination temperature, as lead can be stabilized in the clinker [[8], [9], [10]]. The use of lead-containing wastes recycles solid wastes and reduces the usage of cement clinker, and thus CO 2 emission. However, lead retards the early cement hydration by ...
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Even if this work is still in progress, we can make a reliable hypothesis about the pre-hydration of clinker during grinding process, which is deeply influenced by the presence of the active components (alkanolamines and glycols) of cement additive, or better of Grinding Aids (GA). Download Free PDF View PDF.
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A decrease in both clinker factor (up to 15.8%) and grinding energy ( up to 4.5%) can be simultaneously achieved through substitution of clinker with pozzolan materials with lower Mohs hardness ...
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4.5. Grinding tests realized for constant Blaine fineness The various cement properties determined following clinker grinding at fixed Blaine fineness of 3460 ± 100 cm2/g using either amine or glycol-based GA are summarized in Tables 4 and 5, respectively.
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It is found that the removal rate of hard-to-grind minerals in steel slag is the highest when steel slag enters magnetic separation particle size of 1 mm and magnetic field strength of 1400 Gs. Compared with untreated steel slag, the grinding efficiency of treated steel slag can be increased by 22%, and the hydration activity is not affected.
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The inclusion of high specific surface materials such as calcined clays in cementitious systems enhances the hydration of clinker products at very early ages, but it may also increase water demand; thus, the pursuit of a flowing concrete may demand an increase in the dosage of superplasticizers. The grinding regime can have a major …
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DOI: 10.1016/j.conbuildmat.2020.121293 Corpus ID: 228941792; Assessing the effect of alkanolamine grinding aids in limestone calcined clay cements hydration @article{Zunino2021AssessingTE, title={Assessing the effect of alkanolamine grinding aids in limestone calcined clay cements hydration}, author={Franco Zunino and Karen L. …
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In addition, not only the hydration reactivity of MgO but also the mixed contents of MgO as well as SCMs will influence the expansion behaviour and mechanical strengths of cements, which are also being investigated in our study. 4. Conclusions. Expansive cements were prepared by inter-grinding the cement clinker and MgOs with …
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Mixture design An LC3-50 system (50% clinker content) was used as a reference to study the effect of alkanolamine GAs on hydration and mechan- ical properties. The clay to limestone ratio was ...
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The grinding of Portland clinker leads to the formation of new microcracks in the crystal structure. When the defects are formed, the ionic bonds in the crystals are …
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Coal utilisation in the cement and concrete industries. G. Schumacher, L. Juniper, in The Coal Handbook: Towards Cleaner Production: Coal Utilisation, 2013 15.3.1 Make-up of Portland cement. Portland cement is a fine powder produced by grinding Portland cement clinker (more than 90%), a limited amount of gypsum (calcium sulphate dehydrate – …
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In this case, no significant effect of the grinding aids on the hydration kinetics of LC 3 systems is observed. The total heat release is in all cases similar to the system without the addition of grinding aids. ... The three alkanolamines have different effects on clinker hydration and the precipitation of hydrates, as seen in Fig. 7 and Fig ...
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2.2 Experimental process (1) Clinker grindability An alumina ball mill was used in the grinding process. An alumina mortar was used to crush the hardened clinker (<600-¯m sieve), before it was placed in a ball mill for grinding using a planetary pot mill machine (LA-PO.4, ITOH co., LTD. Tokyo, Japan).
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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 …
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1) alite size, as before. 2) C2S content, as before. 3) grinding aid. Cost 0.6-1.2 €/t, usage 150-400 g/t. As the cement particle gets smaller the pores disappear and no longer become a factor. Increasing the amount of grinding aid will make the cement easier to grind. Hard burning = hard grinding.
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The early hydration period of up to two hours, before normal setting characteristically takes place, is important for the handling, placing and transporting of concrete, in which the reactive component towards water is the Portland cement component. 341 342 Vol. 12, No. 3 J. Bensted In the present work the effects of the clinker-gypsum …
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This paper aims to evaluate the influence of three kinds of sulfates from the green production of cement on its sintering and hydration. The properties of clinker and hydration were monitored by thermogravimetric and differential thermal analysis (TG–DTA), X-ray diffraction, X-ray fluorescence and isothermal conduction calorimeter. Results …
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An external CaSO 4 source (typically gypsum, anhydrite, or bassanite) is added to OPC clinker during the grinding or sometimes the mixing process to produce …
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A finer particle size allows for faster and more controlled hydration reactions. Consistency and Quality Control: Clinker grinding ensures uniformity in the cement …
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This paper aims to evaluate the influence of three kinds of sulfates from the green production of cement on its sintering and hydration. The properties of clinker and …
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The grinding of Portland clinker leads to the formation of new microcracks in the crystal structure. When the defects are formed, the ionic bonds in the crystals are broken, and the grains gain high surface energy. ... After 7 days of hydration, the strength was similar in all series, whereas after 28 days, it was 11% and 5% lower for CEM + TEA ...
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This paper elaborates on the occurrence of MgO in cement clinker and hydration products and its influence on the properties of clinker and cement. ... and …
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Grinding aids (GAs) are increasingly used during cement production to reduce energy consumption and/or optimize clinker factor. This paper seeks to assess the effect of such additions on variations in flow of cement pastes, including static yield stress (τ 0) and viscosity (η). Grinding tests were performed at fixed specific energy consumption …
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The grinding process involves reducing the size of the clinker particles to increase their surface area, enabling the hydration reaction to occur quickly when water is added. Efficient grinding is important as it can significantly reduce the energy consumption and carbon emissions associated with cement production (Ku Ishak, and Saiyid Hashim ...
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Clinker, the residue formed by high-temperature burning of coal or similar materials, plays an important role in the composition of cement and contributes to the properties of cement in different ways. Our research provides a fundamental understanding of the relationship between the surface energy of cement phases (the phases in clinker) and ...
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Studies have also been conducted on the impact of grinding aids on the setting time and hydration rate of cement (Hashem, Hekal, and El Wahab, 2019; Zunino and Scrivener, 2021; Ding et al., 2022 ...
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Current research may contribute not only to understanding the effects of PSD on the pre-hydration and hydration behavior of CSA cement but may also provide guidance to the cement industry for improving the performance of CSA cement while reducing the costs from the clinker grind process. 2. Materials and methods2.1. Materials
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Calcined clay particles also influence clinker hydration through physical effects [3, 23, 93,94,95]. ... Since dolomitic limestones are expected to be mixed directly (by inter-grinding or inter-mixing) with clinker and calcined clay, addition of these limestones to the calcined clay cements system offers a potential avenue for their utilisation ...
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Blending calcined clay with limestone will reduce the grinding time to achieve the sought fineness. 2. Co-grinding clinker with the blend of calcined clay and limestone increases water demand and lowers strength. The agglomeration and coating by the calcined clay particles prevent clinker grains to be finely ground.
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Clinker crystallography was determined by X-ray diffraction analysis; the samples were prepared with the help of a McCrone micronizing machine using isopropanol as the grinding aid, following the process explained by Snellings . Per each sample three measurements were taken and their diffractograms were recorded in the range of 5–70° …
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