effect of limestone composition and microstructure on the

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  • Effects of alkali treatment on the microstructure ...

    Full Article. Effects of Alkali Treatment on the Microstructure, Composition, and Properties of the Raffia textilis Fiber Raymond Gentil Elenga, a, * Philippe Djemia, b David Tingaud, b Thierry Chauveau, b Jean Goma Maniongui, a and Guy Dirras b The Raffia textilis fiber has a specific strength of 660 MPa cm 3 /g and scales and hollows on its surface.

  • Microstructural characterization of limestone exposed to ...

     · Highlights: • The microstructure of limestone (25 °C–800 °C) was analyzed by XRD, SEM and TG-DSC. • The microstructural properties of the crystal are anisotropic in different crystal plane directions. • Microstructure controls the macroscopic properties of limestone. - Abstract: Limestone ...

  • Strength-promoting mechanism of alkanolamines on limestone ...

    This paper reports the strength-promoting mechanism of alkanolamines on limestone-calcined clay cement (LC 3).The hydration kinetics, phase formation and microstructure of LC 3 with triethanolamine (TEA) or triisopropanolamine (TIPA) were investigated. TEA enhanced the strength of LC 3, while TIPA was effective at 28 days, and a correct sulfate addition promoted their effects.

  • (PDF) Effect of limestone aggregate type and water–cement ...

    Effect of limestone aggregate type and water–cement ratio on concrete strength. ... The strength of rocks is closely related to their mineralogical composition. Ceyhan limestone is mainly composed of calcite crystals having occasional non-continuous fracture and Fe 2 O 3 content in the same fracture. ... The microstructure of concrete depends ...

  • Effect of composition and microstructure of humic acid on ...

    Therefore, the effect of composition and microstructure of HA on sorption of 3,3'',4,4''-tetrachlorobiphenyl (PCB77) was investigated in this study. The primary sorption mechanism of PCB77 on HAs was also demonstrated by using Fourier transform infrared (FTIR) and solid-state carbon-13 nuclear magnetic resonance ( 13 C-NMR) spectroscopy analysis.

  • Investigations about the effect of aggregates on strength ...

    Limestone and granitic coarse aggregates have the same Faury maximum dimension (9.52) and similar fineness modulus respectively 5.5 and 5.2. Schist sand has a lower maximum dimension (2.78) and a fineness modulus of 2.38. 2.2. Mix proportion, strength testing and microanalysis of the binders The samples composition is shown in Table 4. In this

  • Investigation of porosity and permeability effects from ...

     · 2.3. Microstructure Analysis [9] Determining space and time modifications of the microstructure requires locating the fluid rock interface of to in a common coordinate system. The transformation parameters permitting this change of reference frame were determined for a sub‐domain of about 400 3 voxels (or ∼8 mm 3).

  • Effects of Alkali Treatment on the Microstructure ...

    effect of alkaline treatment at room temperature on its microstructure, structure, composition, thermal behavior, mechanical properties, and color. To this end, slack raw fibers were soaked in three NaOH solutions (2.5%, 5%, and 10% by weight) for 12 hours. SEM observations revealed

  • Effect of Limestone Composition and Microstructure on the ...

    Request PDF | Effect of Limestone Composition and Microstructure on the Strength of Aggregates and Concretes | Limestone rock aggregates were collected from the Fayoum depression southwest of ...

  • Effect of strontium substitution on the composition and ...

     · The purpose of the present study is to examine the effect of Sr 2+ concentration on the composition and microstructure of calcium phosphates samples prepared by sol–gel chemistry. Sol–Gel process has been used because of its many advantages like the lower temperature involved in the preparation and the possibility to prepare materials as ...

  • The Effect of Limestone Filler on the Properties of Self ...

    composition and specific surface according to Blaine method) is given in Table 1.The composition of concrete mixtures is given in Table 2. Table 1. Chemical composition of microfillers and Blaine specific surface. Limestone powder Fly ash Component L-1 L-2 FA SiO2 1,35 0,13 52,77 Fe2O3 0,50 0,20 7,32 Al2O3 0,46 0,20 24,98 CaO 51,60 52,38 3,42

  • Investigation of porosity and permeability effects from ...

    Investigation of porosity and permeability effects from microstructure changes during limestone dissolution Catherine Noiriel,1,2 Philippe Gouze,1 and Dominique Bernard3 Received 21 September 2004; revised 29 October 2004; accepted 17 November 2004; published 21 December 2004.

  • Phase composition, microstructure and properties of ...

    The effect of La203-doping on the sinterability of Egyptian dolomite and limestone-derived lime on firing up to 1600°C was investigated. The La203/CaO ratios ranged between 0.4 and 1.5 mole% of the investigated materials. The composition of the phases formed on firing and the microstructures of the obtained grains were studied using chemical analysis, X-ray diffraction and reflected light ...

  • Effects of limestone petrography and calcite ...

    Limestone represents the main raw material for ordinary Portland cement clinker production. In this study eight natural limestones from different geological environments were chosen to prepare raw meals for clinker manufacturing, aiming to define a parameter controlling the burnability. First, limestones were characterized by X-Ray Fluorescence, X-Ray Powder Diffraction and Optical Microscopy ...

  • Effect of Composition and Microstructure on the Seawater ...

    Effect of Composition and Microstructure on the Seawater Corrosion Resistance of Nickel Aluminum Bronze. by Harold T. Michels, Copper Development Association Inc., and Robert M. Kain, LaQue Center for Corrosion Technology, Inc; Paper Number 03262 reproduced with permission from Corrosion/2003 Annual Conference and Exhibition, San Diego, California; ©NACE International.

  • Effect of Microstructure and Composition of Limestone ...

    STP691 Effect of Microstructure and Composition of Limestone, Marble, Basalt, and Quartzite Aggregate on Concrete Durability in Presence of Solutions of Calcium Chloride and Magnesium Sulfate

  • Minerals | Free Full-Text | Geopolymers Based on ...

    This study reports the effect of natural dolomite addition to fly ash and the mechanical activation of this blend on the geopolymerization process. Dolomite was replaced with fly ash at 1, 3, 5, and 10 wt.%. Geopolymers were synthesized at ambient temperature using NaOH solution as an alkaline agent. The geopolymerization process, reactivity of the raw material, compressive strength, and ...

  • The effect of limestone powder additions on strength and ...

    The effect of limestone powder additions on strength and microstructure of fly ash blended cements ... Thermodynamic modelling is essential to understand the effect of binder composition on ...

  • Effect of sintering temperature of potassium feldspar ...

     · Using limestone (CaCO 3) and/or dolomite (CaMg(CO 3) 2) as the additives, crystalline structure breakdown of potassium feldspar is achieved by high-temperature treatment and a K-containing multi-nutrient silicate fertilizer is thus produced. Effect of sintering temperature on the available nutrient contents, mineral phases, and microstructure ...

  • Effect of process conditions and chemical composition on ...

     · Effect of process conditions and chemical composition on the microstructure and properties of chemically vapor deposited SiC, Si, ZnSe, ZnS and ZnS(x)Se(1-x) Subatmospheric pressure CVD processes have been developed to produce theoretically dense, highly pure, void-free and large area bulk materials, SiC, Si, ZnSe, ZnS and ZnS(x)Se(1-x). These materials are used for optical …

  • ABSTRACT

    Microstructure of the hydrated lime (CL90s) binder. Microcrystals of carbonated lime (CaCO 3) sized c. 1 µm in clusters forming an open structure including abundant pores with a wide size range. Table 7. Hygric properties of silica (S) and limestone (P) aggregate mortars- (*) (gm/m2.sec0.5) COV- …

  • Effect of Limestone Composition and Microstructure on the ...

     · Limestone rock aggregates were collected from the Fayoum depression southwest of Cairo, Egypt. The chemical and mineral composition as well as the microstructure of the aggregates was studied using XRF, XRD and transmitted light microscopy, respectively. Other tests were carried out on the aggregates including uniaxial compressive strength, bulk density, porosity and water absorption.

  • Effects of drying processes on composition, microstructure ...

    The aim of this study is to determine the effects of different drying methods, including freeze drying (FD), convective drying, sun drying, infrared drying and vacuum drying (VD), on the chemical composition and microstructure of maqui berries as well as their anti-inflammatory and antidiabetic activities.

  • Effect of chemical composition and microstructure on the ...

    Effect of chemical composition and microstructure on the mechanical behavior of fish scales from Megalops Atlanticus. Gil-Duran S(1), Arola D(2), Ossa EA(3). Author information: (1)Production Engineering Department, School of Engineering, Universidad Eafit, Medellín, Colombia.

  • Effect of sintering temperature of potassium feldspar ...

    limestone (CaCO 3) and/or dolomite (CaMg(CO ) 2) as the additives, crystalline struc-ture breakdown of potassium feldspar is achieved by high‐temperature treatment and a K‐containing multi‐nutrient silicate fertilizer is thus produced. Effect of sintering temperature on the available nutrient contents, mineral phases, and microstructure

  • Effect of the calcination temperature on the composition ...

    Effect of the calcination temperature on the composition and microstructure of hydroxyapatite derived from human and animal bone December 2010 Ceramics International 36(8):2383-2393

  • Effect of limestone powder on microstructure of concrete ...

     · The effect of limestone powder on microstructure of concrete was studied by using mercury intrusion porosimetry (MIP), backscattering scanning electron(BSE), scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The experimental results show that the compressive strength of concrete containing 100 kg/m3 limestone powder can meet the strength …

  • (PDF) Effect of Chemical Composition on the Microstructure ...

    Leszczyńska-Madej et al. [10] studied effect of chemical composition on the microstructure and tribological properties of Sn-based alloys. It was discovered that cast Sn-12Sb-6Cu-Pb alloy has ...

  • Effects of limestone powder on the hydration and ...

    In order to explore the effects of limestone powder on the long-term performance of calcium sulphoaluminate (CSA) cement, the hydration process and microstructure development of …

  • EFFECT OF TEMPERATURE ON THE STRUCTURE AND …

    Keywords: Thermal treatment, Microstructure, Compressive strength, Fly ash and blended cement This study aimed to investigate the effect of heat treatment on microstructure and phase composition of pastes containing fly ash (FA) and limestone (LS). Two groups of cement pastes were prepared. In the first group, Portland cement (OPC) has been

  • Influence of gypsum and limestone, used as mineral ...

     · The impact of limestone and gypsum as additives on phase composition and properties of AAC was determined. In the initial study on the laboratory scale, influence of limestone on the microstructure of AAC was determined. Later, on a technical scale, properties such as compressive strength, dry density, thermal conductivity coefficient, drying ...

  • THE MICROSTRUCTURE AND MECHANICAL PROPERTIES …

    The limestone was purchased from Jinan city, Shandong Province, and was ground for 30 minutes. The mean diameter of the ground limestone is 8.26 μm, while the specific surface area is up to 574 m2∙kg-1. Table 1. The composition of the calcined clay and limestone (mass fraction/%). ComponentsCaOSiO 2 Al 2 O 3 K 2 O 2 O 3 FeTiO 2 LOI*

  • Microstructural characterization of limestone exposed to ...

     · Therefore, the impact of thermal effects on the microstructure of limestone is investigated in this study, in which 8 groups of limestone samples are exposed to different temperatures (25 °C, 100 °C, 200 °C, 300 °C, 500 °C, 600 °C, 700 °C and 800 °C), after which X-ray diffraction, differential scanning calorimetry and scanning electron ...

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