calorimetric studies of special cements akademiai

Calorimetric studies of special cements | SpringerLink

Nov 01, 1995· The kinetics and even the mechanism of cement reaction with water can be successfully investigated by use of microcalorimetry. In this study this method was applied to follow the hydration of the new family of portland cements containing C 12 A 7 * and C 11 A 7 ·CaF 2 addition as well as special cement with C 3 A replacement by calcium sulphoaluminate. It has been found that C 11 A 7

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Calorimetric study of calcium aluminate cement blended

Jun 19, 2009· Abstract. The use of by-product gypsum is an important alternative in concrete design. In present experiment, conduction calorimetry was applied to investigate the early hydration of calcium aluminate cement (CAC)/flue gas desulfurization (FGD) gypsum paste, supplemented with the determination of setting times and analysis of hydrates by X-ray diffraction (XRD).

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Calorimetric investigations of the influence of waste

Apr 28, 2009· The aim of this work is to compare the influence of addition of waste aluminosilicate catalyst on the initial periods of hydration of different cements, i.e. calcium aluminate cements of different composition and Portland cement, basing on the calorimetric studies. Cement pastes containing up to 25 mass% of additive were studied, where theОнлайн-запрос

Calorimetry in the studies of cement hydration

Calorimetry in the studies of cement hydration Article in Journal of Thermal Analysis and Calorimetry 100(2):571-576 · May 2010 with 37 Reads How we measure 'reads'

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The study of Cement Hydration by isothermal Calorimetry

the hydration in stages II-IV. To study stage I, it is necessary to mix water and cement inside the sample ampoule within the calorimeter. This is quite easy if there is a high wa-ter-cement ratio (w/c), however for lower, more realistic water content this is a more dif-ficult experiment (Wadsö 1995).Онлайн-запрос

Calorimetric studies of cementitious materials DeepDyve

Calorimetric studies of cementitious materials — chromium interaction Calorimetric studies of cementitious materials — chromium interaction Nocuń-Wczelik, W. 1997-08-01 00:00:00 Cementitious systems based on portland cement are used for immobilization of toxic and hazardous wastes. The addition of waste material may impact the hydration reaction in cement matrix and consequently theОнлайн-запрос

Calorimetric studies of special cements | Journal of

Abstract The kinetics and even the mechanism of cement reaction with water can be successfully investigated by use of microcalorimetry. In this study this method was applied to follow the hydratio...

Cited by: 4

Calorimetry of Cement-Based Materials | NIST

Verbeck, G.J., and Foster, C.W., Long-Time Study of Cement Performance in Concrete with Special Reference to Heats of Hydration, PCA Bulletin 32, 1949. 1950-1959 Verbeck, G.J., and Foster, C.W., Long-Time Study of Cement Performance in Concrete: Chapter 6- The Heats of Hydration of the Cements , Proceedings- American Society for Testing andОнлайн-запрос

Calorimetric study of calcium aluminate cement blended

Jun 19, 2009· Abstract The use of by-product gypsum is an important alternative in concrete design. In present experiment, conduction calorimetry was applied to investigate the early hydration of calcium aluminate cement (CAC)/flue gas desulfurization (FGD) gypsum paste, supplemented with the determination of setting times and analysis of hydrates by X-ray diffraction (XRD).Онлайн-запрос

(PDF) Calorimetry and other methods in the studies of

In this study, the calorimeter was applied to follow the hydration of special cement mixtures exhibiting expansion or shrinkage compensation. The shrinkage-less and expansive binders were producedОнлайн-запрос

Barbara Pacewska's research works | Warsaw University of

Barbara Pacewska's 86 research works with 984 citations and 3,568 reads, including: Effect of structurally different aluminosilicates on early-age hydration of calcium aluminate cement dependingОнлайн-запрос

Expansive Cement1 DocShare.tips

CCTA10 Special Issue ´ ´ Ó Akademiai Kiado, Budapest, Hungary 2010 Abstract Calorimetry was applied to follow the hydration of special cement mixtures exhibiting expansion or shrinkage compensation. The standard, common cements show generally less or more visible shrinkage on setting and hardening but mixed with and expansive agent, usuallyОнлайн-запрос

(PDF) A new approach to determine soil microbial biomass

A method to determine soil microbial biomass (SMB) by isothermal calorimetry is reported. Soil samples ranging in pH from 6.2 to 9.4 and different textures were used to develop the method.Онлайн-запрос

Calorimetry and other methods in the studies of expansive

Abstract In this study, the calorimeter was applied to follow the hydration of special cement mixtures exhibiting expansion or shrinkage compensation. The shrinkage-less and expansive binders wereОнлайн-запрос

Study of gypsum by PDSC Akademiai Kiado

Mar 18, 2012· One-step process was observed to occur at negligible in non-isothermal condition and below 100 °C in isothermal condition, while two-step process occurs at autogenous in non-isothermal condition and above 100 °C in isothermal condition [].Thermal decomposition of gypsum is very dependent on the experimental conditions such as particle size of the sample, atmosphere, heating rate.Онлайн-запрос

Some aspects on the history of thermal analysis in

Some aspects on the history of thermal analysis Gravimetric, Volumetric and Calorimetric Studies of the Surface Structure of Portland Cement Special Trends in Thermal Analysis. 1995, Chichester: Wiley. [73] G. Liptay, Atlas of Thermoanalytic Curves, Budapest, London: Akadémiai Kiadó andОнлайн-запрос

Structural characterization and thermal behaviour of

<section class="abstract"><h2 class="abstractTitle text-title my-1" id="d288e2">Abstract</h2><p>Thermal study and structural characterization of biologicalОнлайн-запрос

Annales UMCS, Chemia Home ICM

The short survey covers invention and development of thermal and related analytical methods: calorimetry, thermoporometry, dilatometry, thermogravimetry, sorptometry, hygrometry.Онлайн-запрос

Water shutoff ScienceDirect

The idea of water shutoff treatments raised already in 1922 when the injection of silicate solutions into oil producing wells with the aim at gelation in situ to form a blocking phase was patented. The developments with regard to water shutoff can be categorized into two major types.Онлайн-запрос

Control of geopolymer properties by grinding of land

Oct 10, 2015· This paper is focused on the investigation of a land filled Hungarian fly ash (Tiszaújváros dumpsite) as a main component of geopolymer. After determination of the fly ash properties such as particle size distribution, moisture content, real and bulk density and specific surface area, mechanical activation by fine grinding of the fly ash sample was performed in laboratory scale ball millОнлайн-запрос

New Measurements of the Apparent Thermal Conductivity of

The aim of this paper is to investigate in depth whether adding nanoparticles or nanotubes to a fluid enhances its heat transfer capabilities. For this reason, the thermal conductivities and viscosities of a selection of nanofluids were thoroughly examined. The systems studied were (a) ethylene glycol with added CuO, TiO2, or Al2O3 nanoparticles and (b) water with TiO2 or Al2O3 nanoparticlesОнлайн-запрос

Lin Yang Early-age cracking of concrete and calorimetry

17. Mills RH. Factors influencing cessation of hydration in water cured cement pastes. Special Report No. 90, Proceedings of the Symposium on the Structure of Portland Cement Paste and Concrete, Highway Research Board, Washington DC, 1966;406424. 239. 18. Schutter GD. Fundamental study of early age concrete behavior as a basis for durableОнлайн-запрос

Recent Developments in Polymer Recycling by Research

Recent Developments in Polymer Recycling, 2011: 47-100 ISBN: 978-81-7895-524-7 Editors: A. Fainleib and O.Grigoryeva 2. Recent advances in the recycling of rubber waste 1Онлайн-запрос

Professor Jianglong Yu / Staff Profile / The University of

Jianglong Yu obtained his PhD degree from Chemical Engineering of the University of Newcastle in 2003. In the following two years, he worked in Monash University as a postdoc research fellow. He was offered an academic position in 2005 in Shenyang Aerospace University and acted as the Director of Thermal Energy Research Centre.Онлайн-запрос

Ability of the R3 test to evaluate differences in early

In that study a good prediction of compressive strength of mortars containing 30 wt% calcined clays was obtained after 1d of calorimetric measurement at 40 °C for all setting ages. Li et al. 2018 reached a good prediction of 28d compressive strength of mortars at a replacement rate of 30 wt% of cement

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MICROCALORIMETRIC STUDY ON CALCIUM ALUMINATE

382 MICROCALORIMETRIC STUDY ON CALCIUM ALUMINATE CEMENT HYDRATION Neven Ukrainczyk1, Juraj Šipušić1, Pero Dabić2, Tomislav Matusinović1 1 Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 20, Zagreb, Croatia 2 Faculty of Chemistry and Technology, University of Split, Teslina 10/V, Split, Croatia Corresponding author: N. Ukrainczyk:Онлайн-запрос

Effect of citric acid and the hemihydrate amount on the

ABSTRACT. The influence of citric acid on the hydration and strength development of a calcium sulphoaluminate cement was investigated. Cement pastes were prepared by mixing calcium sulphoaluminate (C 4 A 3 Ŝ) with 15, 20 and 25wt% of hemihydrate (CŜH 0.5).Citric acid was added as a retarder at 0 and 0.5wt%.Онлайн-запрос

Calorimetric studies of the physico-chemical properties of

Additive solutions at 0.1% and 0.2 % each by weight of cement (bwoc) with a ratio of (1:1) are also studied. The retardation of cement hydration process is monitored via isothermal calorimetry. Rheological studies are conducted to study the plasticizing effect induced by these additives.

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Calorimetry and other methods in the studies of expansive

Calorimetry and other methods in the studies of expansive cement hydrating mixtures W. Nocun´-Wczelik • A. Bochenek • M. Migdał Bretsznajder Special Chapter The Author(s) 2012. This article is published with open access at Springerlink Abstract In this study, the calorimeter was applied to follow the hydration of special cementОнлайн-запрос

Effects of Surfactants on the Properties of Mortar

The raw materials used in the present study are Portland cement clinker (PCC) and raw gypsum (G). Each of those raw materials was separately ground in a steel ball mill until the surface area of, respectively, 3650 and 2800 cm 2 /g was achieved. The chemical composition of the raw materials is shown in Table 2.The mineralogical composition of the PCC sample is C 3 S, 58.79%; β-C 2 S,

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Special Issue for National Conference On Recent Advances

Special Issue for National Conference On Recent Advances in Technology and Management for Integrated Growth 2013 (RATMIG 2013) Organized By: GNI Nagpur, India Calorimetric Studies on Heat Evolution and Temperature Rise due to Hydration of Cementitious Materials in Concrete using Semi-Adiabatic Calorimeter.Онлайн-запрос

Journal of Thermal Analysis and Calorimetry | Home

Journal of Thermal Analysis and Calorimetry (JTAC) is a fully peer-reviewed, highly cited journal that publishes good quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. Twelve issues are published every year containing regular and special issues which focus on topics at the forefront of thermal analysis and calorimetry which are carried outОнлайн-запрос

Calorimetric Study | Scientific.Net

Special Book Collections Home Calorimetric Study. Papers by Keyword: Calorimetric Study. Paper Title Page. which is obtained by wetting and hydration of cement. A calorimetric research of the effect of cement-carbon material was held in this article. 425Онлайн-запрос

Materiales de Construcción, Vol 64, No 316 (2014) CSIC

Cement pastes were prepared by mixing calcium sulphoaluminate (C 4 A 3 Ŝ) with 15, 20 and 25wt% of hemihydrate (CŜH 0.5 ). Citric acid was added as a retarder at 0 and 0.5wt%. The samples were cured at 20 °C for periods of time from 1 to 28 days to evaluate their compressive strength and to characterize the hydration products by scanning

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Alkali Activated Systems ASU Digital Repository

5.2 Isothermal Calorimetric Studies on Slag Mortars..67 5.3 Isothermal Calorimetric Studies on Fly ash-Slag Blend Mortars..70 5.4 Effect of Leaching on the Electrical Solution Conductivity of the Mixes.....72 5.5 Reaction Product in Powder Sodium Silicate Activated Slag and Fly ash –Онлайн-запрос

Cement; Lime; Gypsum ASTM International

Calorimetric Study of Cement Blends Containing Fly Ash, Silica Fume, and Slag at Elevated Temperatures. Use of High Volumes of Class C and Class F Fly Ash in Concrete. Strength Measurement of Concrete Using Different Cylinder Sizes: A Statistical Analysis. Accelerated SulfateОнлайн-запрос

Paper versus Plastic | World Cement

Apr 22, 2020· Secondly, a calorimetric analysis was conducted on the cement paste mixed externally from the samples to measure the amount and rate of heat which evolved during cement hydration. Measurements were performed up to 24 hours from the point of first contact between dry powder and water against a calibrated reference of similar mass and heat capacity.Онлайн-запрос

Mössbauer, XRD, and Complex Thermal Analysis of the

Hydration of cement with and without fly ash is studied with Mössbauer spectroscopy, XRD, and thermal analysis. Iron in cement is present as Fe 3+ -ions and occupies two octahedral positions, with close isomer shifts and quadrupole splittings. Iron in fly ash is present as Fe 2+ and Fe 3+ , and the Mössbauer spectra display three doublets—two for Fe<sup>3+</sup> in octahedral