The improvement in the physico-mechanical properties of lime–silica fume (SF) pastes through the incorporation of nano-metakaolin (NMK) was investigated. Lime–SF paste (1 : 1 by weight) was prepared as a reference binder. To examine the influence of NMK on strength development, SF was replaced with 2–10 wt% NMK.
taher physicochemical properties of metakaolin-lime pastes ... The study of metakaolin-lime hydration process is of great interest in the field of building materials technology.This study aimed to investigate experimentally the physicochemical properties of pastes containing metakaolin (MK) and lime as activator.
The physico-chemical properties of hydrothermally treated MK–CKD pastes were studied by measuring the compressive strength, porosity and bulk density of the hardened pastes as hydraulic properties.The hydration properties of the pastes were studied by measuring free lime and chemically-combined water contents. The phase composition and crystal-
2.2.1. Physico-chemical testing When binders of powdered pozzolans, such as metakaolin are mixed with hydrated lime, or natural hydraulic lime is mixed with ter, due to the reaction among the amorphous phase of pozzolans and hydrated lime [5]. On the other hand, the natural hydraulic lime binder when mixed with water produces similar components
Table 5 shows the free lime contents of the hardened specimens of blended cement made from OPC and CKD (with and without treatment) after 90 days of curing. The identification of free lime for OPC pastes is fundamental because of the hydration of C 3 S and β-C 2 S. For all OPC-CKD pastes, as the CKD extent increases, the free lime diminishes.
Request PDF | On Dec 1, 2008, M. TAHER and others published PHYSICOCHEMICAL PROPERTIES OF METAKAOLIN-LIME PASTES AT DIFFERENT CALCINATION TEMPERATURES OF KAOLINITE CLAY | Find, read and cite all ...
The use of metakaolin results in considerable enhancement in strength, particularly at the early stages of curing along with the strength at later age (4). Fly ash produces more cementitious paste as it has a lower unit weight. The greater the percentage of fly ash in the paste, the better lubricated the aggregates are and the better concrete ...
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A critical review on the spray drying of fruit extract . taher physicochemical properties of metakaolin lime pastes Mahmoud Ahmed Taher PhD ResearchGate taher physicochemical properties of metakaolin lime pastes Mahmoud Ahmed Taher with expertise in Analytical Materials and Electrochemistry Read 20 publications and contact Mahmoud Ahmed Taher water treatment …
Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition. ... Properties of lime–metakolin mortars for the restoration of historic masonries. By Asterios Bakolas and Eleni Aggelakopoulou. Study physico-chemical properties of blended cements containing fixed amount of silica fume, blast furnace slag ...
taher physicochemical properties of metakaolin lime pastes. taher physicochemical properties of metakaolin lime pastes; de fin etude de conception d un convoyeur mobile abande apente reglable com; ash-silica fume pastes Topics by Science.gov. Aug 01, 2017 Sample records for ash-silica fume pastes hydrated lime and silica fume and mortar with ...
In the present study, physico-chemical investigations have been carried out on the possibility of using Cameroonian volcanic or clay pozzolans as raw material for geopolymer or pozzolanic binder. The research had made some suggestive results and conclusions. Powders of less than 100 μm of five sampled pozzolans from volcanic or clay origins have been subjected to chemical and mineralogical ...
Physicochemical Properties of Metakaolin-lime Pastes at Different Calcination Temperatures of Kaolinite Clay OAFMS M.A.Taher, A.Y.Sayed Al-Azhar Bull. Sci. 19 (2), 1-17, 2008
Effect of metakaolin on the properties of aerial lime-based mortars Les mortiers de restauration doivent avoir une composition similaire aux matériaux anciens. Pour assurer cette compatibilité, le liant de chaux aérienne peut être utilisé avec un composant hydraulique actif¶.
and metakaolin or natural hydraulic lime and fine aggregates of carbonate nature, nano-titania of anatase (90 per cent) and rutile (10 per cent) has been added in 4.5-6 per cent w/w of binder. The aim was to study the effect of nano-titania in the hydration and carbonation of the above binders and to compare the physico-chemical properties of the
In this investigation, the physico-chemical properties of artificial pozzolanic cement pastes containing MK produced by calcination of kaolinite clay at different temperatures (700, 800, 900, and 1000oC) were studied. PC was partially substituted for by 0, 5, 10, 15 and 20 …
12%The materials used in this work were blended OPC limestone (24%), nano metakaolin. This thesis aims to study the effect of some nano materials such as nano metakaolin (NMK) on the hydration characteristics of blended cement pastes up to 90 days of hydration. Blended cements containing 0, 5 and 10 wt% nano MK, were also studied. The hydration and the physico …
cement paste and aggregate3. The reaction of pozzolana with the lime liberated during the hydration process of Portland cement modifies some properties of cement and resulting concrete. The change occurring in the phase composition and microstructure of pozzolanic cement pastes containing activated kaolinite clay was investigated4. The ...
Lime/Lemon: Commences from the 2nd/3rd year with 50-60 fruits per tree. Calcium hydroxide - Wikipedia. The active lime is widely used in steel production. It is an important auxiliary material in steel making industry. the using of active lime in steel making industry is very profitable. Recently years, the capacity of steel industry used lime ...
Phsico-Chemical and Mechanical Properties of Portland Cement Pastes A Thesis Submitted For Ph.D. Degree in Chemistry By Abd El-Rahman Ragab Khalil M.Sc. (chemesrtry), (2014) Supervised By Prof. Dr.Eisa EL-Sayed Hekal Professor of physical Chemistry and Building Materials, Faculty of Science, Ain shames University. Prof. Dr., D.Sc. Hamdy El ...
physicochemical properties of metakaolin-lime pastes at different calcination temperatures of kaolinite clay m.a.taher, a.y.el-sayed, o.a.farghaly and m.r.shatat chemistry department. Faculty of Science, Al-Azhar University, Assiut,Egypt Abstract The study of metakaolin-lime hydration process is of great interest in the field of building
The effect of magnesia on ternary systems composed of limestone, metakaolin and calcium hydroxide, alkali activated with sodium silicate, sodium hydroxide, and sodium sulphate was studied by determination of the compressive strength, X-ray powder diffraction (XRD), thermogravimetry (TG), and scanning electron microscope (SEM). Pastes activated with sodium silicate and sodium …
The improvement in the physico-mechanical properties of lime–silica fume (SF) pastes through the incorporation of nano-metakaolin (NMK) was investigated. Lime–SF paste (1 : …
This study aims to investigate the effect of MgSO4 solution on the durability of the pastes made of ordinary Portland cement (OPC) blended with 10, 20 and 30 wt.% metakaolin (MK) and the pastes made by partial substitution of metakaolin in the mix containing 30% metakaolin by 5 and 10 wt.% limestone (LS). All pastes were prepared using the suitable amount of water for standard …
Altogether nine different compositions of lime-based pastes were prepared and investigated. The first paste (L) consisted of pure lime and it was used as the reference mix. Lime–metakaolin pastes (MK-1–MK-4) contained lime and metakaolin only, in the mass ratios of the lime to metakaolin equal to 9:1, 8:2, 7:3, and 6:4, respectively.
M.A. Taher et al. 303 impacts caused by the dispersion of the harmful chemicals contained in PG into surrounding environment. M. Taher et al. [23] studied Physico-chemical properties of Portland Pozzolanic cement paste after partial substitution of gypsum with …
The performance of ternary binders using lime, metakaolin (MK) and gravel wash mud (GWM) powders is studied for the development of novel lime-pozzolan pastes. This study examines the influence of varying mixture proportions using different types and compositions of lime powders and GWM at different treatment levels on the mechanical properties ...
The goal of the paper was development and testing of a novel type of ternary blended binder based on lime hydrate, metakaolin, and biomass ash that was studied as a binding material for production of lightweight mortar for renovation purposes. The biomass ash used as one of binder components was coming from wood chips ash combustion in a biomass heating plant.
A new range of grouts prepared by air lime and metakaolin (MK) as a pozzolanic admixture has been obtained by using as dispersing agents two polymers, namely poly-naphthalene sulfonate (PNS) and lignosulfonate (LS), with the aim of improving the
Metakaolin (MK) is nowadays a well-known pozzolanic material used in cement-based materials. Its benefits are related to its great pozzolanic reactivity when compared with some others pozzolanic materials, like fly ash or ground-granulated blast furnace slag. When MK reacts with calcium hydroxide, cementitious products are formed. It is known that the main phases produced during its pozzolanic ...
Metakaolin Using Ball Milling In Tanzania. Indian concrete journal options for the future of cementthis makes use onsite by typical construction workers leading to more efficient use of limestone quarries depending on the brazil thailand cuba were analyzed substitution by a combination of metak
Mahmoud Ahmed Taher. Blended cement could reduce the harmful effect of cement manufacture, which is composed mostly of Portland cement and one or two compounds called supplementary cementitious ...
The free lime content of OPC paste increases with the increase of curing time up to 90 days; this is due to the continuous hydration of C3S and b-C2S which liberate free lime. On the other hand, the free lime contents of all MK-pozzolanic cement pastes increase with increasing hydration time up to 7 days, then decrease up to 90 days.
When metakaolin is added in the hydration process, it reacts with free lime to form additional CSH material, thereby increasing the density of the matrix and more durable [13] Khatib and Herbert, 2005). According to [14], Metakaolin can successfully be used to partially replaced cement paste …
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