Contact Us

Chemical and mechanical activation of hybrid fly ash cement

Chemical and mechanical activation of hybrid fly ash cement Grizelda du Toit Centre of Product Excellence, AfriSam South Africa (Pty) Ltd, Johannesburg, South Africa; Department of Chemistry, University of Pretoria, Pretoria, South Africa (Orcid:0000-0002-3439-1359) Elsabé P. Kearsley Department of Civil Engineering, University of Pretoria, Pretoria, South Africa (Orcid:0000-0003-0458

Chemical and mechanical activation of hybrid fly ash cement

It has been proven before that chemical activation in the form of sodium sulfate addition and mechanical activation via milling can both be used as effective activation methods for high fly ash containing hybrid cements. It is however not clear what effect the two activation techniques will have on compressive strength development over an extended curing period. Since fly ash chemistry (and to a

Mechanical activation and cement formation of β

01/10/2003 The mechanical activation of β-TCP led to materials that could be used to form a cement with setting and mechanical properties demanded in clinical use. The setting times with 2.5% Na 2 HPO 4 -solution as liquid phase are in the range between 5 and 16 min and might be adjustable by varying the sodium phosphate content of the liquid.

Mechanical activation of cement–slag mortars ScienceDirect

01/01/2012 Chemical activation that is, inter-grinding chemicals with Portland cement clinker and mineral additives, or mixing chemicals with concrete as accelerating admixtures . Fine grinding was suggested to improve the reactivity of the blended cement constituents . Fine grinding leads to the generation of a larger surface area, whereas mechanical activation results from combined effect of

Mechanical activation of cement with addition of fly ash

The effects of mechanical activation were determined by the comparative analyses of the starting cement and the same cement treated mechanically for 3, 10 and 30 min. The analyses included determination of the specific surface area, X-ray diffractometric analysis (XRD), differential-thermal analysis (DTA) and thermogravimetric analysis (TGA). During the 30-min comminution period, the specific surface area was increasing, while the microstructural changes of portland cement

Chemical and mechanical activation of hybrid fly ash cement

Chemical and mechanical activation of hybrid fly ash cement. Login. UPSpace Home → University of Pretoria: Research Output → Theses and Dissertations (University of Pretoria) → View Item; JavaScript is disabled for your browser. Some features of this site may not work without it. Show simple item record. dc.contributor.advisor: Van der Merwe, E.M. (Elizabet Margaretha) dc.contributor

Chemical and mechanical activation of hybrid fly ash

Chemical and mechanical activation of hybrid fly ash cement. Login. UPSpace Home → University of Pretoria: Research Output → Theses and Dissertations (University of Pretoria) → View Item; JavaScript is disabled for your browser. Some features of this site may not work without it. Show simple item record. dc.contributor.advisor: Van der Merwe, E.M. (Elizabet Margaretha) dc.contributor

Mechanical activation of cement–slag mortars

01/01/2012 Mechanical activation. At low to medium cement replacement, grinding Portland cement and mineral additives to relatively higher fineness yields the desired early strength . Grinding efficiency, however, reduces with higher fineness due to the agglomeration tendency of cement . (b) Thermal activation that is, curing mortar and concrete under

Effects of thermal and mechanical activation methods on

Chemical activation refers to the use of some chemical substances to activate the potential reactivity of cementitious components. Some chemical activators are Na 2 SiO 3, NaOH, KOH, and Na 2 CO 3 [6]. The activator(s) can be added during the milling of cement/ slag or can be dissolved in the mixing water and added during the mixing of cement/slag pastes, mortars, and concrete. The technology

Mechanical-Chemical Activation of Coal Fly Ashes: An

Fernández-Jiménez et al. Mechanical-Chemical Activation of Coal Fly Ashes those characteristics of portland cement. Such materials, knownas“alkali-activatedcements”or“geopolymers,”constitute

Physico-Mechanical and Chemical Properties of Composite

Physico-Mechanical and Chemical Properties of Composite Cement Containing High Percentages of Mechanically Activated Egyptian Slag . B. A. Sabrah1,. 1

Comparison of different methods for activation of ordinary

Comparison of different methods for activation of ordinary Portland cement-slag mortars Fathollah Sajedi,Hashim Abdul Razak Introduction In this experimental work, mechanical, thermal, and chemical methods have been used to improve the compressive strength of OSMs. All three methods can be used to activate the potential reactivity of cement constituents. The mechanical activation is used to

Mechanical activation and cement formation of

Mechanical activation and cement formation of trimagnesium phosphate. Theresa Brückner. Department for Functional Materials in Medicine and Dentistry, University of Wuerzburg, Wuerzburg, Germany. Search for more papers by this author. Katrin Hurle. GeoZentrum Nordbayern, Mineralogy, Friedrich‐Alexander University Erlangen‐Nuremberg, Erlangen, Germany . Search for more papers by

Investigation of different ways of activation of fly ash

of fly ash–cement mixtures, recently published by us [17, 23], show that it is possible to activate them by mechanical or chemical way. Interesting results were obtained in the case of combined mechanical and chemical activation based on grinding together all dry components, i.e., fly ash, portland cement, Ca(OH) 2 and Na 2SO 4 [17, 23

5 Methods of Soil Stabilization Mechanical, Chemical

2. Soil-Cement Stabilization ⇰ Soil-cement is an intimate mix of soil, cement and water which is well compacted to form a strong base course. Addition of cement in small proportion to soil improves its strength and modifies the properties of soil. ⇰ Soil-cement stabilization can be used as a sub-base or base-course of all types of payments

Thermal, Mechanical and Chemical Activation

directions using mechanical, thermal, and chemical activation. Plenty of works have shown that the mechanical activation of the raw materials significantly increases the dissolution rate of solid minerals [13–18]. Phase composition changes during the mechanical dispersion process under atmospheric conditions have been observed by many authors. For instance, it was suggested that ilmenite

Comparison of different methods for activation of ordinary

Comparison of different methods for activation of ordinary Portland cement-slag mortars Fathollah Sajedi,Hashim Abdul Razak Introduction In this experimental work, mechanical, thermal, and chemical methods have been used to improve the compressive strength of OSMs. All three methods can be used to activate the potential reactivity of cement constituents. The mechanical activation is used to

Evaluation of the influence of mechanical activation on

15/06/2018 Moreover, the mechanical performances, as 25% substitution of Portland cement (PC) are assessed, based on the EN 450. Mechanical activation enhances MSWI sludge physically due to the improved particle morphology and packing. Chemically, the hydration degree of PC is enhanced by the MSWI sludge by ≈25%. The milling treatment proved to be beneficial to the residues performances in

Mechanical activation and cement formation of

Mechanical activation and cement formation of trimagnesium phosphate. Theresa Brückner. Department for Functional Materials in Medicine and Dentistry, University of Wuerzburg, Wuerzburg, Germany. Search for more papers by this author. Katrin Hurle. GeoZentrum Nordbayern, Mineralogy, Friedrich‐Alexander University Erlangen‐Nuremberg, Erlangen, Germany . Search for more papers by

Investigation of different ways of activation of fly ash

of fly ash–cement mixtures, recently published by us [17, 23], show that it is possible to activate them by mechanical or chemical way. Interesting results were obtained in the case of combined mechanical and chemical activation based on grinding together all dry components, i.e., fly ash, portland cement, Ca(OH) 2 and Na 2SO 4 [17, 23

Research on Mechanical Behaviour of Cement Mortar with

In this article, coal gangue in Tongchuan stimulated by thermal, mechanical and chemical activation has been used as supplementary gelatinize material in cement. The optimal activated ways and technological parameter have been selected by the test of strength, fluidity, water requirement for normal consistency of cement paste, and stability.

Chemical, Mechanical and Microstructural Properties of

Chemical, Mechanical and Microstructural Properties of Alkali-Activated Cement; Impact Assessment of Farmer Field Schools in Cotton Production in China, India and Pakistan; Socio-Economic Assessment of the Farm Resources and Living Standards of Different Ethnic Groups; คลังเก็บ. กุมภาพันธ์ 2012

ALKALI-ACTIVATION KINETICS OF PHOSPHORUS SLAG CEMENT

alkali activation is a key factor to forecasting the mechanical behavior of alkali activated cement at different curing time and temperatures without carrying out experimental tests. The apparent activation energy was obtained as 35.6 kJ·mol-1 and 60.7 kJ·mol-1 for the two activators, respectively. Investigations proved that the alkali

9783847338956: Applied Activation Techniques on

AbeBooks: Applied Activation Techniques on Cement-Slag Mortars and Concretes: Chemical, Thermal, Mechanical and combined activation methods (9783847338956) by Sajedi, Fathollah and a great selection of similar New, Used and Collectible Books available now at great prices.

(PDF) Chemical activation and set acceleration of lime

Chemical Activation and Set Acceleration X-Ray DiffractometryTaftan pozzolan, 50-day hardened paste of limenatural pozzolan cement, and 50-day hardened paste of lime-natural pozzolan cement containing 6 wt.% Na 2 SO 4 were studied with X-ray diffractometry technique to identify their crystalline mineral phases. The X-ray diffraction patterns of the hardened paste of limenatural pozzolan cement

Thermal, Mechanical and Chemical Activation

directions using mechanical, thermal, and chemical activation. Plenty of works have shown that the mechanical activation of the raw materials significantly increases the dissolution rate of solid minerals [13–18]. Phase composition changes during the mechanical dispersion process under atmospheric conditions have been observed by many authors. For instance, it was suggested that ilmenite